41d5105 feat(keys): kitty keyboard protocol and Ctrl+1..9 recent-session switching (#295) · vev

M README.md +1 -0


@@ -69,6 +69,7 @@ vev --web-daemon start the browser terminal
69	69		\| Alt+Space \| command palette \|
70	70		\| Alt+f \| floating terminal \|
71	71		\| Alt+1 … 9 \| switch tab \|
	72	+	\| Ctrl+1 … 9 \| switch to a recent session ([kitty keyboard terminals](docs/terminal.md#kitty-keyboard)) \|
72	73		\| Alt+h/j/k/l or Alt+Arrow \| focus pane \|
73	74		\| Alt+a \| jump to a session needing attention \|
74	75


@@ -69,6 +69,7 @@ vev --web-daemon start the browser terminal
69	\| Alt+Space \| command palette \|	69		\| Alt+Space \| command palette \|
70	\| Alt+f \| floating terminal \|	70		\| Alt+f \| floating terminal \|
71	\| Alt+1 … 9 \| switch tab \|	71		\| Alt+1 … 9 \| switch tab \|
		72	+	\| Ctrl+1 … 9 \| switch to a recent session ([kitty keyboard terminals](docs/terminal.md#kitty-keyboard)) \|
72	\| Alt+h/j/k/l or Alt+Arrow \| focus pane \|	73		\| Alt+h/j/k/l or Alt+Arrow \| focus pane \|
73	\| Alt+a \| jump to a session needing attention \|	74		\| Alt+a \| jump to a session needing attention \|
74		75

M docs/configuration.md +4 -0


@@ -40,6 +40,9 @@ tabs.terminal-title = on
40	40		# Remove a numbered (ephemeral) session when its last client exits.
41	41		ephemeral.close-on-exit = on
42	42
	43	+	# Use the kitty keyboard protocol when the terminal supports it (enables Ctrl+1..9).
	44	+	keyboard.kitty-protocol = on
	45	+
43	46		# Rebindable actions. Leave a line out to keep its built-in binding.
44	47		open-palette = alt+space
45	48		toggle-floating-pane = alt+f

@@ -213,6 +216,7 @@ Valid keys: `alt+<char>`, `alt+space`, `alt+left/right/up/down`, `alt+1` to `alt
213	216
214	217		- Setting an action replaces all its default keys. For example, setting `focus-pane-left` removes Alt+Left too.
215	218		- Tab switching works with AZERTY and other layouts without extra config.
	219	+	- Ctrl+1 to Ctrl+9 (recent sessions) are fixed and not rebindable. Turn them off with `keyboard.kitty-protocol = off`.
216	220		- `alt+[` is not supported: terminals use it for escape sequences.
217	221		- Cmd/Super is not supported. Map it in your terminal to `ESC` + a character, then bind `alt+<char>` in vev.
218	222


@@ -40,6 +40,9 @@ tabs.terminal-title = on
40	# Remove a numbered (ephemeral) session when its last client exits.	40		# Remove a numbered (ephemeral) session when its last client exits.
41	ephemeral.close-on-exit = on	41		ephemeral.close-on-exit = on
42		42
		43	+	# Use the kitty keyboard protocol when the terminal supports it (enables Ctrl+1..9).
		44	+	keyboard.kitty-protocol = on
		45	+
43	# Rebindable actions. Leave a line out to keep its built-in binding.	46		# Rebindable actions. Leave a line out to keep its built-in binding.
44	open-palette = alt+space	47		open-palette = alt+space
45	toggle-floating-pane = alt+f	48		toggle-floating-pane = alt+f

@@ -213,6 +216,7 @@ Valid keys: `alt+<char>`, `alt+space`, `alt+left/right/up/down`, `alt+1` to `alt
213		216
214	- Setting an action replaces all its default keys. For example, setting `focus-pane-left` removes Alt+Left too.	217		- Setting an action replaces all its default keys. For example, setting `focus-pane-left` removes Alt+Left too.
215	- Tab switching works with AZERTY and other layouts without extra config.	218		- Tab switching works with AZERTY and other layouts without extra config.
		219	+	- Ctrl+1 to Ctrl+9 (recent sessions) are fixed and not rebindable. Turn them off with `keyboard.kitty-protocol = off`.
216	- `alt+[` is not supported: terminals use it for escape sequences.	220		- `alt+[` is not supported: terminals use it for escape sequences.
217	- Cmd/Super is not supported. Map it in your terminal to `ESC` + a character, then bind `alt+<char>` in vev.	221		- Cmd/Super is not supported. Map it in your terminal to `ESC` + a character, then bind `alt+<char>` in vev.
218		222

M docs/terminal.md +10 -0


@@ -47,6 +47,16 @@ Not supported: file or shared-memory transfer, animations (first frame only), Un
47	47
48	48		Terminals without Kitty graphics get text only and one warning.
49	49
	50	+	## Kitty keyboard
	51	+
	52	+	When your outer terminal supports the kitty keyboard protocol (kitty, foot, ghostty, WezTerm, recent Alacritty), vev enables it at startup. Ctrl+1 to Ctrl+9 then switch to the 1st to 9th previous session in the status-bar history. Ctrl+1 goes back to the session you used last.
	53	+
	54	+	- Detection uses the same short query as Kitty graphics. Other terminals keep their usual keys, and Ctrl+digits reach the pane unchanged.
	55	+	- It works with AZERTY and other layouts.
	56	+	- Programs in panes that ask for the kitty keyboard protocol (Neovim, Helix, fish) receive it. Others get classic key bytes.
	57	+	- Turn it off with `keyboard.kitty-protocol = off` in the [configuration](configuration.md).
	58	+	- If vev is killed and your shell gets odd keys, run `printf '\e[<u'` to reset the terminal.
	59	+
50	60		## Environment
51	61
52	62		- New panes inherit the environment of the client that last attached. Running processes keep theirs.


@@ -47,6 +47,16 @@ Not supported: file or shared-memory transfer, animations (first frame only), Un
47		47
48	Terminals without Kitty graphics get text only and one warning.	48		Terminals without Kitty graphics get text only and one warning.
49		49
		50	+	## Kitty keyboard
		51	+
		52	+	When your outer terminal supports the kitty keyboard protocol (kitty, foot, ghostty, WezTerm, recent Alacritty), vev enables it at startup. Ctrl+1 to Ctrl+9 then switch to the 1st to 9th previous session in the status-bar history. Ctrl+1 goes back to the session you used last.
		53	+
		54	+	- Detection uses the same short query as Kitty graphics. Other terminals keep their usual keys, and Ctrl+digits reach the pane unchanged.
		55	+	- It works with AZERTY and other layouts.
		56	+	- Programs in panes that ask for the kitty keyboard protocol (Neovim, Helix, fish) receive it. Others get classic key bytes.
		57	+	- Turn it off with `keyboard.kitty-protocol = off` in the [configuration](configuration.md).
		58	+	- If vev is killed and your shell gets odd keys, run `printf '\e[<u'` to reset the terminal.
		59	+
50	## Environment	60		## Environment
51		61
52	- New panes inherit the environment of the client that last attached. Running processes keep theirs.	62		- New panes inherit the environment of the client that last attached. Running processes keep theirs.

M go.mod +1 -1


@@ -3,7 +3,7 @@ module github.com/bnema/vev
3	3		go 1.27
4	4
5	5		require (
6		-	github.com/bnema/vev-vt v0.5.2-0.20260909134859-55a2b5aa1b3a
	6	+	github.com/bnema/vev-vt v0.5.2-0.20260926054010-6ae9bc5fde91
7	7		github.com/coder/websocket v1.8.15
8	8		github.com/quic-go/quic-go v0.62.0
9	9		github.com/stretchr/testify v1.12.1


@@ -3,7 +3,7 @@ module github.com/bnema/vev
3		go 1.27	3		go 1.27
4			4
5		require (	5		require (
6	-	github.com/bnema/vev-vt v0.5.2-0.20260909134859-55a2b5aa1b3a	6	+	github.com/bnema/vev-vt v0.5.2-0.20260926054010-6ae9bc5fde91
7		github.com/coder/websocket v1.8.15	7		github.com/coder/websocket v1.8.15
8		github.com/quic-go/quic-go v0.62.0	8		github.com/quic-go/quic-go v0.62.0
9		github.com/stretchr/testify v1.12.1	9		github.com/stretchr/testify v1.12.1

M go.sum +2 -0 generated file: collapsed

load diff

M internal/adapters/config/config.go +9 -0


@@ -36,6 +36,7 @@ func Parse(r io.Reader) (domain.Config, []domain.Warning, error) {
36	36		seenNavKeys := make(map[string]bool)
37	37		seenTabsKeys := make(map[string]bool)
38	38		seenEphemeralKeys := make(map[string]bool)
	39	+	seenKeyboardKeys := make(map[string]bool)
39	40		seenScrollbackKeys := make(map[string]bool)
40	41		seenWebKeys := make(map[string]bool)
41	42

@@ -162,6 +163,14 @@ func Parse(r io.Reader) (domain.Config, []domain.Warning, error) {
162	163		continue
163	164		}
164	165		cfg.Ephemeral.CloseOnExit = on
	166	+	case key == "keyboard.kitty-protocol":
	167	+	warnings = warnDuplicateKey(warnings, seenKeyboardKeys, key, lineNo)
	168	+	on, ok := parseOnOff(value)
	169	+	if !ok {
	170	+	warnings = append(warnings, domain.Warning{Line: lineNo, Msg: fmt.Sprintf("invalid keyboard.kitty-protocol %q", value)})
	171	+	continue
	172	+	}
	173	+	cfg.Keyboard.KittyProtocol = on
165	174		case key == "copy.word-separators":
166	175		warnings = warnDuplicateKey(warnings, seenCopyKeys, key, lineNo)
167	176		separators, ok := parseConfigString(value)


@@ -36,6 +36,7 @@ func Parse(r io.Reader) (domain.Config, []domain.Warning, error) {
36	seenNavKeys := make(map[string]bool)	36		seenNavKeys := make(map[string]bool)
37	seenTabsKeys := make(map[string]bool)	37		seenTabsKeys := make(map[string]bool)
38	seenEphemeralKeys := make(map[string]bool)	38		seenEphemeralKeys := make(map[string]bool)
		39	+	seenKeyboardKeys := make(map[string]bool)
39	seenScrollbackKeys := make(map[string]bool)	40		seenScrollbackKeys := make(map[string]bool)
40	seenWebKeys := make(map[string]bool)	41		seenWebKeys := make(map[string]bool)
41		42

@@ -162,6 +163,14 @@ func Parse(r io.Reader) (domain.Config, []domain.Warning, error) {
162	continue	163		continue
163	}	164		}
164	cfg.Ephemeral.CloseOnExit = on	165		cfg.Ephemeral.CloseOnExit = on
		166	+	case key == "keyboard.kitty-protocol":
		167	+	warnings = warnDuplicateKey(warnings, seenKeyboardKeys, key, lineNo)
		168	+	on, ok := parseOnOff(value)
		169	+	if !ok {
		170	+	warnings = append(warnings, domain.Warning{Line: lineNo, Msg: fmt.Sprintf("invalid keyboard.kitty-protocol %q", value)})
		171	+	continue
		172	+	}
		173	+	cfg.Keyboard.KittyProtocol = on
165	case key == "copy.word-separators":	174		case key == "copy.word-separators":
166	warnings = warnDuplicateKey(warnings, seenCopyKeys, key, lineNo)	175		warnings = warnDuplicateKey(warnings, seenCopyKeys, key, lineNo)
167	separators, ok := parseConfigString(value)	176		separators, ok := parseConfigString(value)

M internal/adapters/config/config_test.go +43 -0


@@ -352,6 +352,9 @@ func TestParse(t *testing.T) {
352	352		if !tt.want.Ephemeral.CloseOnExit {
353	353		tt.want.Ephemeral = domain.Defaults().Ephemeral
354	354		}
	355	+	if !tt.want.Keyboard.KittyProtocol {
	356	+	tt.want.Keyboard = domain.Defaults().Keyboard
	357	+	}
355	358		if tt.want.Snapshot.RestoreProcesses == nil && !tt.want.Snapshot.RestoreProcessesSet {
356	359		tt.want.Snapshot.RestoreProcesses = append([]string(nil), domain.DefaultSnapshotRestoreProcesses()...)
357	360		}

@@ -520,6 +523,46 @@ func TestParseEphemeralCloseOnExit(t *testing.T) {
520	523		}
521	524		}
522	525
	526	+	func TestParseKeyboardKittyProtocol(t *testing.T) {
	527	+	t.Parallel()
	528	+
	529	+	tests := []struct {
	530	+	name string
	531	+	input string
	532	+	want bool
	533	+	wantWarnings []domain.Warning
	534	+	}{
	535	+	{name: "absent key defaults on", input: "theme = dark\n", want: true},
	536	+	{name: "on", input: "keyboard.kitty-protocol = on\n", want: true},
	537	+	{name: "off", input: "keyboard.kitty-protocol = off\n", want: false},
	538	+	{
	539	+	name: "invalid value warns and keeps default",
	540	+	input: "keyboard.kitty-protocol = maybe\n",
	541	+	want: true,
	542	+	wantWarnings: []domain.Warning{
	543	+	{Line: 1, Msg: "invalid keyboard.kitty-protocol \"maybe\""},
	544	+	},
	545	+	},
	546	+	}
	547	+
	548	+	for _, tt := range tests {
	549	+	t.Run(tt.name, func(t *testing.T) {
	550	+	t.Parallel()
	551	+
	552	+	got, warnings, err := Parse(strings.NewReader(tt.input))
	553	+	if err != nil {
	554	+	t.Fatalf("Parse() error = %v", err)
	555	+	}
	556	+	if got.Keyboard.KittyProtocol != tt.want {
	557	+	t.Fatalf("Parse() Keyboard.KittyProtocol = %v, want %v", got.Keyboard.KittyProtocol, tt.want)
	558	+	}
	559	+	if !reflect.DeepEqual(warnings, tt.wantWarnings) {
	560	+	t.Fatalf("Parse() warnings = %#v, want %#v", warnings, tt.wantWarnings)
	561	+	}
	562	+	})
	563	+	}
	564	+	}
	565	+
523	566		func TestParseNavigationOverflow(t *testing.T) {
524	567		t.Parallel()
525	568


@@ -352,6 +352,9 @@ func TestParse(t *testing.T) {
352	if !tt.want.Ephemeral.CloseOnExit {	352		if !tt.want.Ephemeral.CloseOnExit {
353	tt.want.Ephemeral = domain.Defaults().Ephemeral	353		tt.want.Ephemeral = domain.Defaults().Ephemeral
354	}	354		}
		355	+	if !tt.want.Keyboard.KittyProtocol {
		356	+	tt.want.Keyboard = domain.Defaults().Keyboard
		357	+	}
355	if tt.want.Snapshot.RestoreProcesses == nil && !tt.want.Snapshot.RestoreProcessesSet {	358		if tt.want.Snapshot.RestoreProcesses == nil && !tt.want.Snapshot.RestoreProcessesSet {
356	tt.want.Snapshot.RestoreProcesses = append([]string(nil), domain.DefaultSnapshotRestoreProcesses()...)	359		tt.want.Snapshot.RestoreProcesses = append([]string(nil), domain.DefaultSnapshotRestoreProcesses()...)
357	}	360		}

@@ -520,6 +523,46 @@ func TestParseEphemeralCloseOnExit(t *testing.T) {
520	}	523		}
521	}	524		}
522		525
		526	+	func TestParseKeyboardKittyProtocol(t *testing.T) {
		527	+	t.Parallel()
		528	+
		529	+	tests := []struct {
		530	+	name string
		531	+	input string
		532	+	want bool
		533	+	wantWarnings []domain.Warning
		534	+	}{
		535	+	{name: "absent key defaults on", input: "theme = dark\n", want: true},
		536	+	{name: "on", input: "keyboard.kitty-protocol = on\n", want: true},
		537	+	{name: "off", input: "keyboard.kitty-protocol = off\n", want: false},
		538	+	{
		539	+	name: "invalid value warns and keeps default",
		540	+	input: "keyboard.kitty-protocol = maybe\n",
		541	+	want: true,
		542	+	wantWarnings: []domain.Warning{
		543	+	{Line: 1, Msg: "invalid keyboard.kitty-protocol \"maybe\""},
		544	+	},
		545	+	},
		546	+	}
		547	+
		548	+	for _, tt := range tests {
		549	+	t.Run(tt.name, func(t *testing.T) {
		550	+	t.Parallel()
		551	+
		552	+	got, warnings, err := Parse(strings.NewReader(tt.input))
		553	+	if err != nil {
		554	+	t.Fatalf("Parse() error = %v", err)
		555	+	}
		556	+	if got.Keyboard.KittyProtocol != tt.want {
		557	+	t.Fatalf("Parse() Keyboard.KittyProtocol = %v, want %v", got.Keyboard.KittyProtocol, tt.want)
		558	+	}
		559	+	if !reflect.DeepEqual(warnings, tt.wantWarnings) {
		560	+	t.Fatalf("Parse() warnings = %#v, want %#v", warnings, tt.wantWarnings)
		561	+	}
		562	+	})
		563	+	}
		564	+	}
		565	+
523	func TestParseNavigationOverflow(t *testing.T) {	566		func TestParseNavigationOverflow(t *testing.T) {
524	t.Parallel()	567		t.Parallel()
525		568

M internal/adapters/sessionwire/proto_convert_session.go +2 -0


@@ -51,6 +51,7 @@ func helloToWire(message protocol.Hello) (*wire.Hello, error) {
51	51		NavigationCapabilities: uint32(message.NavigationCapabilities),
52	52		Remote: message.Remote,
53	53		KittyDirectGraphics: message.KittyDirectGraphics,
	54	+	KittyKeyboard: message.KittyKeyboard,
54	55		}, nil
55	56		}
56	57

@@ -133,6 +134,7 @@ func helloFromWire(message *wire.Hello) (protocol.Hello, error) {
133	134		}
134	135		hello.Remote = message.GetRemote()
135	136		hello.KittyDirectGraphics = message.GetKittyDirectGraphics()
	137	+	hello.KittyKeyboard = message.GetKittyKeyboard()
136	138		if err := protocol.ValidateHello(hello); err != nil {
137	139		return protocol.Hello{}, err
138	140		}


@@ -51,6 +51,7 @@ func helloToWire(message protocol.Hello) (*wire.Hello, error) {
51	NavigationCapabilities: uint32(message.NavigationCapabilities),	51		NavigationCapabilities: uint32(message.NavigationCapabilities),
52	Remote: message.Remote,	52		Remote: message.Remote,
53	KittyDirectGraphics: message.KittyDirectGraphics,	53		KittyDirectGraphics: message.KittyDirectGraphics,
		54	+	KittyKeyboard: message.KittyKeyboard,
54	}, nil	55		}, nil
55	}	56		}
56		57

@@ -133,6 +134,7 @@ func helloFromWire(message *wire.Hello) (protocol.Hello, error) {
133	}	134		}
134	hello.Remote = message.GetRemote()	135		hello.Remote = message.GetRemote()
135	hello.KittyDirectGraphics = message.GetKittyDirectGraphics()	136		hello.KittyDirectGraphics = message.GetKittyDirectGraphics()
		137	+	hello.KittyKeyboard = message.GetKittyKeyboard()
136	if err := protocol.ValidateHello(hello); err != nil {	138		if err := protocol.ValidateHello(hello); err != nil {
137	return protocol.Hello{}, err	139		return protocol.Hello{}, err
138	}	140		}

M internal/adapters/sessionwire/proto_convert_test.go +1 -0


@@ -38,6 +38,7 @@ func TestProtoClientRoundTrips(t *testing.T) {
38	38		target := protoTestTarget()
39	39		messages := []protocol.ClientMessage{
40	40		protocol.Hello{Version: protocol.Version, Intent: protocol.IntentAttach, Size: domain.Size{Cols: 80, Rows: 24}},
	41	+	protocol.Hello{Version: protocol.Version, Intent: protocol.IntentAttach, Size: domain.Size{Cols: 80, Rows: 24}, KittyDirectGraphics: true, KittyKeyboard: true},
41	42		protocol.Input{InputSeq: 1, ActionID: 2, Data: []byte("x")},
42	43		protocol.Resize{Size: domain.Size{Cols: 80, Rows: 24}},
43	44		protocol.Detach{},


@@ -38,6 +38,7 @@ func TestProtoClientRoundTrips(t *testing.T) {
38	target := protoTestTarget()	38		target := protoTestTarget()
39	messages := []protocol.ClientMessage{	39		messages := []protocol.ClientMessage{
40	protocol.Hello{Version: protocol.Version, Intent: protocol.IntentAttach, Size: domain.Size{Cols: 80, Rows: 24}},	40		protocol.Hello{Version: protocol.Version, Intent: protocol.IntentAttach, Size: domain.Size{Cols: 80, Rows: 24}},
		41	+	protocol.Hello{Version: protocol.Version, Intent: protocol.IntentAttach, Size: domain.Size{Cols: 80, Rows: 24}, KittyDirectGraphics: true, KittyKeyboard: true},
41	protocol.Input{InputSeq: 1, ActionID: 2, Data: []byte("x")},	42		protocol.Input{InputSeq: 1, ActionID: 2, Data: []byte("x")},
42	protocol.Resize{Size: domain.Size{Cols: 80, Rows: 24}},	43		protocol.Resize{Size: domain.Size{Cols: 80, Rows: 24}},
43	protocol.Detach{},	44		protocol.Detach{},

M internal/adapters/term/terminal.go +32 -2


@@ -38,6 +38,7 @@ type Terminal struct {
38	38		entered bool // true between a successful EnterRaw and its restore
39	39		rawSkipped bool // true if fd wasn't a tty, so MakeRaw/Restore were skipped
40	40		restoreFn func() error // the single idempotent restore closure for the current session
	41	+	kittyKeys bool // kitty keyboard flags were pushed and must be popped on restore
41	42
42	43		// Resize watcher state, also guarded by mu so watcher start
43	44		// (ResizeEvents) and watcher stop (restore) are strictly ordered:

@@ -116,6 +117,34 @@ func (t *Terminal) EnterRaw() (func() error, error) {
116	117		return t.restoreFn, nil
117	118		}
118	119
	120	+	// EnableKittyKeyboard pushes kitty keyboard protocol flags on the alternate
	121	+	// screen entered by EnterRaw. The session's restore pops them.
	122	+	func (t *Terminal) EnableKittyKeyboard(flags int) error {
	123	+	t.mu.Lock()
	124	+	defer t.mu.Unlock()
	125	+	if !t.entered \|\| t.kittyKeys {
	126	+	return nil
	127	+	}
	128	+	// Mark first: if any prefix reached the terminal, restore must pop.
	129	+	t.kittyKeys = true
	130	+	if _, err := t.bw.Write(KittyKeyboardPushSequence(flags)); err != nil {
	131	+	return fmt.Errorf("term: enable kitty keyboard: %w", err)
	132	+	}
	133	+	if err := t.bw.Flush(); err != nil {
	134	+	return fmt.Errorf("term: enable kitty keyboard: %w", err)
	135	+	}
	136	+	return nil
	137	+	}
	138	+
	139	+	// restoreSequenceLocked returns the visual cleanup for the current session.
	140	+	// Must be called with t.mu held.
	141	+	func (t *Terminal) restoreSequenceLocked() []byte {
	142	+	if t.kittyKeys {
	143	+	return VisualRestoreSequenceWithKittyKeyboard()
	144	+	}
	145	+	return VisualRestoreSequence()
	146	+	}
	147	+
119	148		// resetVisualModesDirect writes visualRestore straight to the descriptor
120	149		// instead of through the batched writer. It is the fallback for a writer that
121	150		// has already failed: any prefix of the enter sequence may have reached the

@@ -127,7 +156,7 @@ func (t *Terminal) resetVisualModesDirect() {
127	156		if t.observation != nil {
128	157		t.observation.InvalidateTerminalObservation()
129	158		}
130		-	_, _ = t.out.Write(VisualRestoreSequence())
	159	+	_, _ = t.out.Write(t.restoreSequenceLocked())
131	160		}
132	161
133	162		// makeRestoreLocked returns an idempotent restore closure for the

@@ -150,7 +179,7 @@ func (t *Terminal) restore() error {
150	179		t.mu.Lock()
151	180		defer t.mu.Unlock()
152	181
153		-	_, werr := t.bw.Write(VisualRestoreSequence())
	182	+	_, werr := t.bw.Write(t.restoreSequenceLocked())
154	183		ferr := t.bw.Flush()
155	184		if werr != nil \|\| ferr != nil {
156	185		t.resetVisualModesDirect()

@@ -159,6 +188,7 @@ func (t *Terminal) restore() error {
159	188		rerr := t.restoreRawLocked()
160	189
161	190		t.entered = false
	191	+	t.kittyKeys = false
162	192		t.restoreFn = nil
163	193
164	194		t.stopResizeLocked()

 	entered    bool           // true between a successful EnterRaw and its restore
 	rawSkipped bool           // true if fd wasn't a tty, so MakeRaw/Restore were skipped
 	restoreFn  func() error   // the single idempotent restore closure for the current session
+	kittyKeys  bool           // kitty keyboard flags were pushed and must be popped on restore
 	// Resize watcher state, also guarded by mu so watcher start
 	// (ResizeEvents) and watcher stop (restore) are strictly ordered:
 	return t.restoreFn, nil
 }
+// EnableKittyKeyboard pushes kitty keyboard protocol flags on the alternate
+// screen entered by EnterRaw. The session's restore pops them.
+func (t *Terminal) EnableKittyKeyboard(flags int) error {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if !t.entered || t.kittyKeys {
+		return nil
+	}
+	// Mark first: if any prefix reached the terminal, restore must pop.
+	t.kittyKeys = true
+	if _, err := t.bw.Write(KittyKeyboardPushSequence(flags)); err != nil {
+		return fmt.Errorf("term: enable kitty keyboard: %w", err)
+	}
+	if err := t.bw.Flush(); err != nil {
+		return fmt.Errorf("term: enable kitty keyboard: %w", err)
+	}
+	return nil
+}
+// restoreSequenceLocked returns the visual cleanup for the current session.
+// Must be called with t.mu held.
+func (t *Terminal) restoreSequenceLocked() []byte {
+	if t.kittyKeys {
+		return VisualRestoreSequenceWithKittyKeyboard()
+	}
+	return VisualRestoreSequence()
+}
 // resetVisualModesDirect writes visualRestore straight to the descriptor
 // instead of through the batched writer. It is the fallback for a writer that
 // has already failed: any prefix of the enter sequence may have reached the
 	if t.observation != nil {
 		t.observation.InvalidateTerminalObservation()
 	}
-	_, _ = t.out.Write(VisualRestoreSequence())
+	_, _ = t.out.Write(t.restoreSequenceLocked())
 }
 // makeRestoreLocked returns an idempotent restore closure for the
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	_, werr := t.bw.Write(VisualRestoreSequence())
+	_, werr := t.bw.Write(t.restoreSequenceLocked())
 	ferr := t.bw.Flush()
 	if werr != nil || ferr != nil {
 		t.resetVisualModesDirect()
 	rerr := t.restoreRawLocked()
 	t.entered = false
+	t.kittyKeys = false
 	t.restoreFn = nil
 	t.stopResizeLocked()

M internal/adapters/term/terminal_test.go +53 -0


@@ -490,3 +490,56 @@ func TestTerminal_Size_NonTTY_ReturnsError(t *testing.T) {
490	490		t.Fatalf("expected Geometry() to error on a non-tty fd")
491	491		}
492	492		}
	493	+
	494	+	func TestTerminal_KittyKeyboardPushedInsideAltScreenAndPoppedBeforeExit(t *testing.T) {
	495	+	tests := []struct {
	496	+	name string
	497	+	enable bool
	498	+	before bool // enable before EnterRaw: must be a no-op
	499	+	want string
	500	+	}{
	501	+	{name: "disabled", want: visualEnter + visualRestore},
	502	+	{name: "enabled", enable: true, want: visualEnter + "\x1b[>5u" + kittyKeyboardPop + visualRestore},
	503	+	{name: "enable before enter is ignored", enable: true, before: true, want: visualEnter + visualRestore},
	504	+	}
	505	+	for _, tt := range tests {
	506	+	t.Run(tt.name, func(t *testing.T) {
	507	+	inR, inW, err := os.Pipe()
	508	+	if err != nil {
	509	+	t.Fatalf("os.Pipe(in): %v", err)
	510	+	}
	511	+	defer func() { _ = inW.Close() }()
	512	+	defer func() { _ = inR.Close() }()
	513	+	outR, outW, captured, done := pipeCapture(t)
	514	+	defer func() { _ = outR.Close() }()
	515	+
	516	+	tm := NewWithFiles(inR, outW)
	517	+	if tt.before {
	518	+	if err := tm.EnableKittyKeyboard(5); err != nil {
	519	+	t.Fatalf("EnableKittyKeyboard: %v", err)
	520	+	}
	521	+	}
	522	+	restore, err := tm.EnterRaw()
	523	+	if err != nil {
	524	+	t.Fatalf("EnterRaw: %v", err)
	525	+	}
	526	+	if tt.enable && !tt.before {
	527	+	if err := tm.EnableKittyKeyboard(5); err != nil {
	528	+	t.Fatalf("EnableKittyKeyboard: %v", err)
	529	+	}
	530	+	// A second enable must not push twice.
	531	+	if err := tm.EnableKittyKeyboard(5); err != nil {
	532	+	t.Fatalf("second EnableKittyKeyboard: %v", err)
	533	+	}
	534	+	}
	535	+	if err := restore(); err != nil {
	536	+	t.Fatalf("restore: %v", err)
	537	+	}
	538	+	_ = outW.Close()
	539	+	<-done
	540	+	if got := captured.String(); got != tt.want {
	541	+	t.Fatalf("captured escapes = %q, want %q", got, tt.want)
	542	+	}
	543	+	})
	544	+	}
	545	+	}


@@ -490,3 +490,56 @@ func TestTerminal_Size_NonTTY_ReturnsError(t *testing.T) {
490	t.Fatalf("expected Geometry() to error on a non-tty fd")	490		t.Fatalf("expected Geometry() to error on a non-tty fd")
491	}	491		}
492	}	492		}
		493	+
		494	+	func TestTerminal_KittyKeyboardPushedInsideAltScreenAndPoppedBeforeExit(t *testing.T) {
		495	+	tests := []struct {
		496	+	name string
		497	+	enable bool
		498	+	before bool // enable before EnterRaw: must be a no-op
		499	+	want string
		500	+	}{
		501	+	{name: "disabled", want: visualEnter + visualRestore},
		502	+	{name: "enabled", enable: true, want: visualEnter + "\x1b[>5u" + kittyKeyboardPop + visualRestore},
		503	+	{name: "enable before enter is ignored", enable: true, before: true, want: visualEnter + visualRestore},
		504	+	}
		505	+	for _, tt := range tests {
		506	+	t.Run(tt.name, func(t *testing.T) {
		507	+	inR, inW, err := os.Pipe()
		508	+	if err != nil {
		509	+	t.Fatalf("os.Pipe(in): %v", err)
		510	+	}
		511	+	defer func() { _ = inW.Close() }()
		512	+	defer func() { _ = inR.Close() }()
		513	+	outR, outW, captured, done := pipeCapture(t)
		514	+	defer func() { _ = outR.Close() }()
		515	+
		516	+	tm := NewWithFiles(inR, outW)
		517	+	if tt.before {
		518	+	if err := tm.EnableKittyKeyboard(5); err != nil {
		519	+	t.Fatalf("EnableKittyKeyboard: %v", err)
		520	+	}
		521	+	}
		522	+	restore, err := tm.EnterRaw()
		523	+	if err != nil {
		524	+	t.Fatalf("EnterRaw: %v", err)
		525	+	}
		526	+	if tt.enable && !tt.before {
		527	+	if err := tm.EnableKittyKeyboard(5); err != nil {
		528	+	t.Fatalf("EnableKittyKeyboard: %v", err)
		529	+	}
		530	+	// A second enable must not push twice.
		531	+	if err := tm.EnableKittyKeyboard(5); err != nil {
		532	+	t.Fatalf("second EnableKittyKeyboard: %v", err)
		533	+	}
		534	+	}
		535	+	if err := restore(); err != nil {
		536	+	t.Fatalf("restore: %v", err)
		537	+	}
		538	+	_ = outW.Close()
		539	+	<-done
		540	+	if got := captured.String(); got != tt.want {
		541	+	t.Fatalf("captured escapes = %q, want %q", got, tt.want)
		542	+	}
		543	+	})
		544	+	}
		545	+	}

M internal/adapters/term/visual.go +16 -0

@@ -1,5 +1,7 @@
1	1		package term
2	2
	3	+	import "strconv"
	4	+
3	5		const (
4	6		altScreenEnter = "\x1b[?1049h"
5	7		altScreenExit = "\x1b[?1049l"

@@ -14,6 +16,7 @@ const (
14	16		colorSchemeDisable = "\x1b[?2031l"
15	17		autowrapDisable = "\x1b[?7l"
16	18		autowrapEnable = "\x1b[?7h"
	19	+	kittyKeyboardPop = "\x1b[<u"
17	20		)
18	21
19	22		const visualEnter = altScreenEnter + autowrapDisable + cursorHide + mouseEnable + bracketedPasteEnable + colorSchemeEnable

@@ -27,3 +30,16 @@ func VisualEnterSequence() []byte { return []byte(visualEnter) }
27	30
28	31		// VisualRestoreSequence returns a fresh copy of the idempotent visual cleanup.
29	32		func VisualRestoreSequence() []byte { return []byte(visualRestore) }
	33	+
	34	+	// KittyKeyboardPushSequence pushes kitty keyboard protocol flags. Send it
	35	+	// after VisualEnterSequence so it lands on the alternate screen's stack.
	36	+	func KittyKeyboardPushSequence(flags int) []byte {
	37	+	return []byte("\x1b[>" + strconv.Itoa(flags) + "u")
	38	+	}
	39	+
	40	+	// VisualRestoreSequenceWithKittyKeyboard pops the kitty keyboard flags pushed
	41	+	// on the alternate screen before running the visual cleanup, so the main
	42	+	// screen's keyboard mode is left as it was.
	43	+	func VisualRestoreSequenceWithKittyKeyboard() []byte {
	44	+	return []byte(kittyKeyboardPop + visualRestore)
	45	+	}

@@ -1,5 +1,7 @@
1	package term	1		package term
2		2
		3	+	import "strconv"
		4	+
3	const (	5		const (
4	altScreenEnter = "\x1b[?1049h"	6		altScreenEnter = "\x1b[?1049h"
5	altScreenExit = "\x1b[?1049l"	7		altScreenExit = "\x1b[?1049l"

@@ -14,6 +16,7 @@ const (
14	colorSchemeDisable = "\x1b[?2031l"	16		colorSchemeDisable = "\x1b[?2031l"
15	autowrapDisable = "\x1b[?7l"	17		autowrapDisable = "\x1b[?7l"
16	autowrapEnable = "\x1b[?7h"	18		autowrapEnable = "\x1b[?7h"
		19	+	kittyKeyboardPop = "\x1b[<u"
17	)	20		)
18		21
19	const visualEnter = altScreenEnter + autowrapDisable + cursorHide + mouseEnable + bracketedPasteEnable + colorSchemeEnable	22		const visualEnter = altScreenEnter + autowrapDisable + cursorHide + mouseEnable + bracketedPasteEnable + colorSchemeEnable

@@ -27,3 +30,16 @@ func VisualEnterSequence() []byte { return []byte(visualEnter) }
27		30
28	// VisualRestoreSequence returns a fresh copy of the idempotent visual cleanup.	31		// VisualRestoreSequence returns a fresh copy of the idempotent visual cleanup.
29	func VisualRestoreSequence() []byte { return []byte(visualRestore) }	32		func VisualRestoreSequence() []byte { return []byte(visualRestore) }
		33	+
		34	+	// KittyKeyboardPushSequence pushes kitty keyboard protocol flags. Send it
		35	+	// after VisualEnterSequence so it lands on the alternate screen's stack.
		36	+	func KittyKeyboardPushSequence(flags int) []byte {
		37	+	return []byte("\x1b[>" + strconv.Itoa(flags) + "u")
		38	+	}
		39	+
		40	+	// VisualRestoreSequenceWithKittyKeyboard pops the kitty keyboard flags pushed
		41	+	// on the alternate screen before running the visual cleanup, so the main
		42	+	// screen's keyboard mode is left as it was.
		43	+	func VisualRestoreSequenceWithKittyKeyboard() []byte {
		44	+	return []byte(kittyKeyboardPop + visualRestore)
		45	+	}

M internal/adapters/uiterm/terminal.go +3 -0


@@ -124,6 +124,9 @@ func (t *Terminal) runReplies(ctx context.Context) {
124	124		}
125	125		}
126	126
	127	+	// EnableKittyKeyboard is a no-op: a virtual terminal has no outer keyboard.
	128	+	func (t *Terminal) EnableKittyKeyboard(int) error { return nil }
	129	+
127	130		func (t *Terminal) EnterRaw() (func() error, error) {
128	131		if _, err := t.Write(term.VisualEnterSequence()); err != nil {
129	132		return nil, err


@@ -124,6 +124,9 @@ func (t *Terminal) runReplies(ctx context.Context) {
124	}	124		}
125	}	125		}
126		126
		127	+	// EnableKittyKeyboard is a no-op: a virtual terminal has no outer keyboard.
		128	+	func (t *Terminal) EnableKittyKeyboard(int) error { return nil }
		129	+
127	func (t *Terminal) EnterRaw() (func() error, error) {	130		func (t *Terminal) EnterRaw() (func() error, error) {
128	if _, err := t.Write(term.VisualEnterSequence()); err != nil {	131		if _, err := t.Write(term.VisualEnterSequence()); err != nil {
129	return nil, err	132		return nil, err

M internal/adapters/webterm/terminal.go +3 -0


@@ -76,6 +76,9 @@ func New(ctx context.Context, geometry domain.Geometry) (*Terminal, error) {
76	76		return t, nil
77	77		}
78	78
	79	+	// EnableKittyKeyboard is a no-op: a virtual terminal has no outer keyboard.
	80	+	func (t *Terminal) EnableKittyKeyboard(int) error { return nil }
	81	+
79	82		func (t *Terminal) EnterRaw() (func() error, error) {
80	83		if _, err := t.Write(term.VisualEnterSequence()); err != nil {
81	84		return nil, err


@@ -76,6 +76,9 @@ func New(ctx context.Context, geometry domain.Geometry) (*Terminal, error) {
76	return t, nil	76		return t, nil
77	}	77		}
78		78
		79	+	// EnableKittyKeyboard is a no-op: a virtual terminal has no outer keyboard.
		80	+	func (t *Terminal) EnableKittyKeyboard(int) error { return nil }
		81	+
79	func (t *Terminal) EnterRaw() (func() error, error) {	82		func (t *Terminal) EnterRaw() (func() error, error) {
80	if _, err := t.Write(term.VisualEnterSequence()); err != nil {	83		if _, err := t.Write(term.VisualEnterSequence()); err != nil {
81	return nil, err	84		return nil, err

M internal/app/broker_client.go +11 -0


@@ -14,6 +14,7 @@ import (
14	14		"github.com/bnema/vev/internal/adapters/term"
15	15		"github.com/bnema/vev/internal/domain"
16	16		"github.com/bnema/vev/internal/domain/terminalcap"
	17	+	"github.com/bnema/vev/internal/platform"
17	18		"github.com/bnema/vev/internal/ports"
18	19		"github.com/bnema/vev/internal/protocol"
19	20		"github.com/bnema/vev/internal/protocol/catalogue"

@@ -613,6 +614,16 @@ func terminalAttachmentEnvironment() client.AttachmentEnvironment {
613	614		}
614	615		}
615	616
	617	+	// outerTerminalAttachmentEnvironment extends terminalAttachmentEnvironment for
	618	+	// a client that owns a real outer terminal: it probes that terminal once and
	619	+	// applies the user's keyboard setting. Virtual terminals never probe.
	620	+	func outerTerminalAttachmentEnvironment(log *slog.Logger) client.AttachmentEnvironment {
	621	+	env := terminalAttachmentEnvironment()
	622	+	env.ProbeTerminal = true
	623	+	env.KittyKeyboard = loadConfigOrDefaults(log, platform.ConfigPath()).Keyboard.KittyProtocol
	624	+	return env
	625	+	}
	626	+
616	627		// terminalSessionEnvironment captures one LocalCLI process snapshot for
617	628		// session creation before NewSupervisor. The supervisor remaps each remote
618	629		// request to Remote, so the base provenance stays LocalCLI without branching


@@ -14,6 +14,7 @@ import (
14	"github.com/bnema/vev/internal/adapters/term"	14		"github.com/bnema/vev/internal/adapters/term"
15	"github.com/bnema/vev/internal/domain"	15		"github.com/bnema/vev/internal/domain"
16	"github.com/bnema/vev/internal/domain/terminalcap"	16		"github.com/bnema/vev/internal/domain/terminalcap"
		17	+	"github.com/bnema/vev/internal/platform"
17	"github.com/bnema/vev/internal/ports"	18		"github.com/bnema/vev/internal/ports"
18	"github.com/bnema/vev/internal/protocol"	19		"github.com/bnema/vev/internal/protocol"
19	"github.com/bnema/vev/internal/protocol/catalogue"	20		"github.com/bnema/vev/internal/protocol/catalogue"

@@ -613,6 +614,16 @@ func terminalAttachmentEnvironment() client.AttachmentEnvironment {
613	}	614		}
614	}	615		}
615		616
		617	+	// outerTerminalAttachmentEnvironment extends terminalAttachmentEnvironment for
		618	+	// a client that owns a real outer terminal: it probes that terminal once and
		619	+	// applies the user's keyboard setting. Virtual terminals never probe.
		620	+	func outerTerminalAttachmentEnvironment(log *slog.Logger) client.AttachmentEnvironment {
		621	+	env := terminalAttachmentEnvironment()
		622	+	env.ProbeTerminal = true
		623	+	env.KittyKeyboard = loadConfigOrDefaults(log, platform.ConfigPath()).Keyboard.KittyProtocol
		624	+	return env
		625	+	}
		626	+
616	// terminalSessionEnvironment captures one LocalCLI process snapshot for	627		// terminalSessionEnvironment captures one LocalCLI process snapshot for
617	// session creation before NewSupervisor. The supervisor remaps each remote	628		// session creation before NewSupervisor. The supervisor remaps each remote
618	// request to Remote, so the base provenance stays LocalCLI without branching	629		// request to Remote, so the base provenance stays LocalCLI without branching

M internal/app/broker_client_test.go +2 -0


@@ -427,6 +427,8 @@ func (i *terminalCompositionInput) Read(buffer []byte) (int, error) {
427	427		return copy(buffer, chunk), nil
428	428		}
429	429
	430	+	func (t *terminalCompositionTerminal) EnableKittyKeyboard(int) error { return nil }
	431	+
430	432		func (t *terminalCompositionTerminal) EnterRaw() (func() error, error) {
431	433		return func() error {
432	434		t.mu.Lock()


@@ -427,6 +427,8 @@ func (i *terminalCompositionInput) Read(buffer []byte) (int, error) {
427	return copy(buffer, chunk), nil	427		return copy(buffer, chunk), nil
428	}	428		}
429		429
		430	+	func (t *terminalCompositionTerminal) EnableKittyKeyboard(int) error { return nil }
		431	+
430	func (t *terminalCompositionTerminal) EnterRaw() (func() error, error) {	432		func (t *terminalCompositionTerminal) EnterRaw() (func() error, error) {
431	return func() error {	433		return func() error {
432	t.mu.Lock()	434		t.mu.Lock()

M internal/app/broker_offline_client_render_test.go +2 -0


@@ -51,6 +51,8 @@ func newOfflineRenderTerminal(geometry domain.Geometry) *offlineRenderTerminal {
51	51		return &offlineRenderTerminal{geometry: geometry}
52	52		}
53	53
	54	+	func (t *offlineRenderTerminal) EnableKittyKeyboard(int) error { return nil }
	55	+
54	56		func (t *offlineRenderTerminal) EnterRaw() (func() error, error) {
55	57		return func() error { return nil }, nil
56	58		}


@@ -51,6 +51,8 @@ func newOfflineRenderTerminal(geometry domain.Geometry) *offlineRenderTerminal {
51	return &offlineRenderTerminal{geometry: geometry}	51		return &offlineRenderTerminal{geometry: geometry}
52	}	52		}
53		53
		54	+	func (t *offlineRenderTerminal) EnableKittyKeyboard(int) error { return nil }
		55	+
54	func (t *offlineRenderTerminal) EnterRaw() (func() error, error) {	56		func (t *offlineRenderTerminal) EnterRaw() (func() error, error) {
55	return func() error { return nil }, nil	57		return func() error { return nil }, nil
56	}	58		}

M internal/app/run.go +1 -1


@@ -917,7 +917,7 @@ func runAttach(ctx context.Context, intent uint8, name, remoteTarget string) (re
917	917		return runBrokerClient(ctx, brokerClientConfig{
918	918		Logger: log, Connector: withPreconnected(newProductionBrokerConnector(), preconnected), Terminal: terminal, Clock: clk,
919	919		InitialNavigation: navigation, ResolveInitialNavigation: resolver,
920		-	AttachmentEnvironment: terminalAttachmentEnvironment(), SessionEnvironment: terminalSessionEnvironment(),
	920	+	AttachmentEnvironment: outerTerminalAttachmentEnvironment(log), SessionEnvironment: terminalSessionEnvironment(),
921	921		OnState: callbacks.OnState, OnLifecycle: callbacks.OnLifecycle, OnFailure: callbacks.OnFailure,
922	922		})
923	923		}


@@ -917,7 +917,7 @@ func runAttach(ctx context.Context, intent uint8, name, remoteTarget string) (re
917		return runBrokerClient(ctx, brokerClientConfig{	917		return runBrokerClient(ctx, brokerClientConfig{
918		Logger: log, Connector: withPreconnected(newProductionBrokerConnector(), preconnected), Terminal: terminal, Clock: clk,	918		Logger: log, Connector: withPreconnected(newProductionBrokerConnector(), preconnected), Terminal: terminal, Clock: clk,
919		InitialNavigation: navigation, ResolveInitialNavigation: resolver,	919		InitialNavigation: navigation, ResolveInitialNavigation: resolver,
920	-	AttachmentEnvironment: terminalAttachmentEnvironment(), SessionEnvironment: terminalSessionEnvironment(),	920	+	AttachmentEnvironment: outerTerminalAttachmentEnvironment(log), SessionEnvironment: terminalSessionEnvironment(),
921		OnState: callbacks.OnState, OnLifecycle: callbacks.OnLifecycle, OnFailure: callbacks.OnFailure,	921		OnState: callbacks.OnState, OnLifecycle: callbacks.OnLifecycle, OnFailure: callbacks.OnFailure,
922		})	922		})
923		}	923		}

M internal/domain/config.go +11 -0


@@ -91,6 +91,13 @@ type EphemeralConfig struct {
91	91		CloseOnExit bool
92	92		}
93	93
	94	+	// KeyboardConfig contains outer-terminal keyboard settings.
	95	+	type KeyboardConfig struct {
	96	+	// KittyProtocol enables the kitty keyboard protocol on outer terminals
	97	+	// that support it, which makes Ctrl+1..9 recent-session switching work.
	98	+	KittyProtocol bool
	99	+	}
	100	+
94	101		// ScrollbackConfig is vev's per-pane retention policy. The terminal library
95	102		// only enforces these application-selected limits. Zero megabytes disables
96	103		// history; zero lines removes the additional line ceiling.

@@ -131,6 +138,7 @@ type Config struct {
131	138		Nav NavConfig
132	139		Tabs TabsConfig
133	140		Ephemeral EphemeralConfig
	141	+	Keyboard KeyboardConfig
134	142		Scrollback ScrollbackConfig
135	143		}
136	144

@@ -172,6 +180,9 @@ func Defaults() Config {
172	180		Ephemeral: EphemeralConfig{
173	181		CloseOnExit: true,
174	182		},
	183	+	Keyboard: KeyboardConfig{
	184	+	KittyProtocol: true,
	185	+	},
175	186		Scrollback: DefaultScrollbackConfig(),
176	187		}
177	188		}


@@ -91,6 +91,13 @@ type EphemeralConfig struct {
91	CloseOnExit bool	91		CloseOnExit bool
92	}	92		}
93		93
		94	+	// KeyboardConfig contains outer-terminal keyboard settings.
		95	+	type KeyboardConfig struct {
		96	+	// KittyProtocol enables the kitty keyboard protocol on outer terminals
		97	+	// that support it, which makes Ctrl+1..9 recent-session switching work.
		98	+	KittyProtocol bool
		99	+	}
		100	+
94	// ScrollbackConfig is vev's per-pane retention policy. The terminal library	101		// ScrollbackConfig is vev's per-pane retention policy. The terminal library
95	// only enforces these application-selected limits. Zero megabytes disables	102		// only enforces these application-selected limits. Zero megabytes disables
96	// history; zero lines removes the additional line ceiling.	103		// history; zero lines removes the additional line ceiling.

@@ -131,6 +138,7 @@ type Config struct {
131	Nav NavConfig	138		Nav NavConfig
132	Tabs TabsConfig	139		Tabs TabsConfig
133	Ephemeral EphemeralConfig	140		Ephemeral EphemeralConfig
		141	+	Keyboard KeyboardConfig
134	Scrollback ScrollbackConfig	142		Scrollback ScrollbackConfig
135	}	143		}
136		144

@@ -172,6 +180,9 @@ func Defaults() Config {
172	Ephemeral: EphemeralConfig{	180		Ephemeral: EphemeralConfig{
173	CloseOnExit: true,	181		CloseOnExit: true,
174	},	182		},
		183	+	Keyboard: KeyboardConfig{
		184	+	KittyProtocol: true,
		185	+	},
175	Scrollback: DefaultScrollbackConfig(),	186		Scrollback: DefaultScrollbackConfig(),
176	}	187		}
177	}	188		}

M internal/ports/mocks/terminal_mock.go +51 -0


@@ -38,6 +38,57 @@ func (_m MockTerminal) EXPECT() MockTerminal_Expecter {
38	38		return &MockTerminal_Expecter{mock: &_m.Mock}
39	39		}
40	40
	41	+	// EnableKittyKeyboard provides a mock function for the type MockTerminal
	42	+	func (_mock *MockTerminal) EnableKittyKeyboard(flags int) error {
	43	+	ret := _mock.Called(flags)
	44	+
	45	+	if len(ret) == 0 {
	46	+	panic("no return value specified for EnableKittyKeyboard")
	47	+	}
	48	+
	49	+	var r0 error
	50	+	if returnFunc, ok := ret.Get(0).(func(int) error); ok {
	51	+	r0 = returnFunc(flags)
	52	+	} else {
	53	+	r0 = ret.Error(0)
	54	+	}
	55	+	return r0
	56	+	}
	57	+
	58	+	// MockTerminal_EnableKittyKeyboard_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'EnableKittyKeyboard'
	59	+	type MockTerminal_EnableKittyKeyboard_Call struct {
	60	+	*mock.Call
	61	+	}
	62	+
	63	+	// EnableKittyKeyboard is a helper method to define mock.On call
	64	+	// - flags int
	65	+	func (_e MockTerminal_Expecter) EnableKittyKeyboard(flags any) MockTerminal_EnableKittyKeyboard_Call {
	66	+	return &MockTerminal_EnableKittyKeyboard_Call{Call: _e.mock.On("EnableKittyKeyboard", flags)}
	67	+	}
	68	+
	69	+	func (_c MockTerminal_EnableKittyKeyboard_Call) Run(run func(flags int)) MockTerminal_EnableKittyKeyboard_Call {
	70	+	_c.Call.Run(func(args mock.Arguments) {
	71	+	var arg0 int
	72	+	if args[0] != nil {
	73	+	arg0 = args[0].(int)
	74	+	}
	75	+	run(
	76	+	arg0,
	77	+	)
	78	+	})
	79	+	return _c
	80	+	}
	81	+
	82	+	func (_c MockTerminal_EnableKittyKeyboard_Call) Return(err error) MockTerminal_EnableKittyKeyboard_Call {
	83	+	_c.Call.Return(err)
	84	+	return _c
	85	+	}
	86	+
	87	+	func (_c MockTerminal_EnableKittyKeyboard_Call) RunAndReturn(run func(flags int) error) MockTerminal_EnableKittyKeyboard_Call {
	88	+	_c.Call.Return(run)
	89	+	return _c
	90	+	}
	91	+
41	92		// EnterRaw provides a mock function for the type MockTerminal
42	93		func (_mock *MockTerminal) EnterRaw() (func() error, error) {
43	94		ret := _mock.Called()


@@ -38,6 +38,57 @@ func (_m MockTerminal) EXPECT() MockTerminal_Expecter {
38	return &MockTerminal_Expecter{mock: &_m.Mock}	38		return &MockTerminal_Expecter{mock: &_m.Mock}
39	}	39		}
40		40
		41	+	// EnableKittyKeyboard provides a mock function for the type MockTerminal
		42	+	func (_mock *MockTerminal) EnableKittyKeyboard(flags int) error {
		43	+	ret := _mock.Called(flags)
		44	+
		45	+	if len(ret) == 0 {
		46	+	panic("no return value specified for EnableKittyKeyboard")
		47	+	}
		48	+
		49	+	var r0 error
		50	+	if returnFunc, ok := ret.Get(0).(func(int) error); ok {
		51	+	r0 = returnFunc(flags)
		52	+	} else {
		53	+	r0 = ret.Error(0)
		54	+	}
		55	+	return r0
		56	+	}
		57	+
		58	+	// MockTerminal_EnableKittyKeyboard_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'EnableKittyKeyboard'
		59	+	type MockTerminal_EnableKittyKeyboard_Call struct {
		60	+	*mock.Call
		61	+	}
		62	+
		63	+	// EnableKittyKeyboard is a helper method to define mock.On call
		64	+	// - flags int
		65	+	func (_e MockTerminal_Expecter) EnableKittyKeyboard(flags any) MockTerminal_EnableKittyKeyboard_Call {
		66	+	return &MockTerminal_EnableKittyKeyboard_Call{Call: _e.mock.On("EnableKittyKeyboard", flags)}
		67	+	}
		68	+
		69	+	func (_c MockTerminal_EnableKittyKeyboard_Call) Run(run func(flags int)) MockTerminal_EnableKittyKeyboard_Call {
		70	+	_c.Call.Run(func(args mock.Arguments) {
		71	+	var arg0 int
		72	+	if args[0] != nil {
		73	+	arg0 = args[0].(int)
		74	+	}
		75	+	run(
		76	+	arg0,
		77	+	)
		78	+	})
		79	+	return _c
		80	+	}
		81	+
		82	+	func (_c MockTerminal_EnableKittyKeyboard_Call) Return(err error) MockTerminal_EnableKittyKeyboard_Call {
		83	+	_c.Call.Return(err)
		84	+	return _c
		85	+	}
		86	+
		87	+	func (_c MockTerminal_EnableKittyKeyboard_Call) RunAndReturn(run func(flags int) error) MockTerminal_EnableKittyKeyboard_Call {
		88	+	_c.Call.Return(run)
		89	+	return _c
		90	+	}
		91	+
41	// EnterRaw provides a mock function for the type MockTerminal	92		// EnterRaw provides a mock function for the type MockTerminal
42	func (_mock *MockTerminal) EnterRaw() (func() error, error) {	93		func (_mock *MockTerminal) EnterRaw() (func() error, error) {
43	ret := _mock.Called()	94		ret := _mock.Called()

M internal/ports/terminal.go +5 -0


@@ -14,4 +14,9 @@ type Terminal interface {
14	14		In() io.Reader
15	15		Out() io.Writer
16	16		Flush() error
	17	+	// EnableKittyKeyboard pushes the given kitty keyboard protocol flags on
	18	+	// the outer terminal's alternate screen. The restore returned by EnterRaw
	19	+	// pops them before leaving the alternate screen. Terminals without an
	20	+	// outer keyboard return nil and do nothing.
	21	+	EnableKittyKeyboard(flags int) error
17	22		}


@@ -14,4 +14,9 @@ type Terminal interface {
14	In() io.Reader	14		In() io.Reader
15	Out() io.Writer	15		Out() io.Writer
16	Flush() error	16		Flush() error
		17	+	// EnableKittyKeyboard pushes the given kitty keyboard protocol flags on
		18	+	// the outer terminal's alternate screen. The restore returned by EnterRaw
		19	+	// pops them before leaving the alternate screen. Terminals without an
		20	+	// outer keyboard return nil and do nothing.
		21	+	EnableKittyKeyboard(flags int) error
17	}	22		}

M internal/protocol/session.go +5 -2


@@ -16,7 +16,7 @@ import (
16	16		// daemonmux physical preamble conversation (multiplex.proto), whose
17	17		// negotiated ceilings and accepted daemon binding ride the same wire
18	18		// version as the session and broker conversations.
19		-	const Version uint16 = 61
	19	+	const Version uint16 = 62
20	20
21	21		// HandshakeTimeout bounds every transport handshake from connect through the
22	22		// first committed publication. It excludes the preceding client-local

@@ -112,7 +112,10 @@ type Hello struct {
112	112		TrueColor bool
113	113		// KittyDirectGraphics is an explicit declaration that the client has
114	114		// probed its direct outer terminal and it accepts Kitty graphics output.
115		-	KittyDirectGraphics bool
	115	+	KittyDirectGraphics bool
	116	+	// KittyKeyboard declares that the client enabled the kitty keyboard
	117	+	// protocol on its outer terminal, so input carries kitty key sequences.
	118	+	KittyKeyboard bool
116	119		MaxOutputInFlight uint8
117	120		Env []string
118	121		SessionTarget *SessionAttachTarget

 // daemonmux physical preamble conversation (multiplex.proto), whose
 // negotiated ceilings and accepted daemon binding ride the same wire
 // version as the session and broker conversations.
-const Version uint16 = 61
+const Version uint16 = 62
 // HandshakeTimeout bounds every transport handshake from connect through the
 // first committed publication. It excludes the preceding client-local
 	TrueColor   bool
 	// KittyDirectGraphics is an explicit declaration that the client has
 	// probed its direct outer terminal and it accepts Kitty graphics output.
-	KittyDirectGraphics    bool
+	KittyDirectGraphics bool
+	// KittyKeyboard declares that the client enabled the kitty keyboard
+	// protocol on its outer terminal, so input carries kitty key sequences.
+	KittyKeyboard          bool
 	MaxOutputInFlight      uint8
 	Env                    []string
 	SessionTarget          *SessionAttachTarget

M internal/protocol/session_test.go +1 -1


@@ -10,7 +10,7 @@ import (
10	10		)
11	11
12	12		func TestVersionRemainsWireCompatible(t *testing.T) {
13		-	require.Equal(t, uint16(61), Version)
	13	+	require.Equal(t, uint16(62), Version)
14	14		require.Equal(t, (16<<20)-407, MaxOutputDataLen)
15	15		}
16	16


@@ -10,7 +10,7 @@ import (
10		)	10		)
11			11
12		func TestVersionRemainsWireCompatible(t *testing.T) {	12		func TestVersionRemainsWireCompatible(t *testing.T) {
13	-	require.Equal(t, uint16(61), Version)	13	+	require.Equal(t, uint16(62), Version)
14		require.Equal(t, (16<<20)-407, MaxOutputDataLen)	14		require.Equal(t, (16<<20)-407, MaxOutputDataLen)
15		}	15		}
16			16

M internal/protocol/wire/envelope_inventory_test.go +2 -2


@@ -15,8 +15,8 @@ import (
15	15		// shares a payload type except route navigation failure, and the preamble
16	16		// constants agree with the schema authority.
17	17		func TestEnvelopeInventoryProvesDirectionAndSemanticPath(t *testing.T) {
18		-	if protocol.Version != 61 {
19		-	t.Fatalf("protocol.Version = %d, want 61", protocol.Version)
	18	+	if protocol.Version != 62 {
	19	+	t.Fatalf("protocol.Version = %d, want 62", protocol.Version)
20	20		}
21	21		if ProtocolEpoch != 1 {
22	22		t.Fatalf("ProtocolEpoch = %d, want 1", ProtocolEpoch)


@@ -15,8 +15,8 @@ import (
15		// shares a payload type except route navigation failure, and the preamble	15		// shares a payload type except route navigation failure, and the preamble
16		// constants agree with the schema authority.	16		// constants agree with the schema authority.
17		func TestEnvelopeInventoryProvesDirectionAndSemanticPath(t *testing.T) {	17		func TestEnvelopeInventoryProvesDirectionAndSemanticPath(t *testing.T) {
18	-	if protocol.Version != 61 {	18	+	if protocol.Version != 62 {
19	-	t.Fatalf("protocol.Version = %d, want 61", protocol.Version)	19	+	t.Fatalf("protocol.Version = %d, want 62", protocol.Version)
20		}	20		}
21		if ProtocolEpoch != 1 {	21		if ProtocolEpoch != 1 {
22		t.Fatalf("ProtocolEpoch = %d, want 1", ProtocolEpoch)	22		t.Fatalf("ProtocolEpoch = %d, want 1", ProtocolEpoch)

M internal/protocol/wire/schema/session.proto +1 -0


@@ -33,6 +33,7 @@ message Hello {
33	33		bool remote = 20;
34	34		bool kitty_direct_graphics = 21;
35	35		SessionAttachTarget session_target = 22; // optional pointer
	36	+	bool kitty_keyboard = 23;
36	37		}
37	38
38	39		// Welcome answers an accepted attach.


@@ -33,6 +33,7 @@ message Hello {
33	bool remote = 20;	33		bool remote = 20;
34	bool kitty_direct_graphics = 21;	34		bool kitty_direct_graphics = 21;
35	SessionAttachTarget session_target = 22; // optional pointer	35		SessionAttachTarget session_target = 22; // optional pointer
		36	+	bool kitty_keyboard = 23;
36	}	37		}
37		38
38	// Welcome answers an accepted attach.	39		// Welcome answers an accepted attach.

M internal/protocol/wire/session.pb.go +11 -2 generated file: collapsed

load diff

M internal/usecase/client/attachment_session.go +26 -19


@@ -68,12 +68,15 @@ func (e *AttachmentIdentityError) Error() string {
68	68		// The request is the exact request the supervisor opened the stream with; the
69	69		// rest is client-local presentation data the worker mirrors into Hello.
70	70		type sessionAttachmentConfig struct {
71		-	Request ports.BrokerOpenStreamRequest
72		-	ClientID [16]byte
73		-	Geometry domain.Geometry
74		-	TermEnv string
75		-	Cwd string
76		-	TrueColor bool
	71	+	Request ports.BrokerOpenStreamRequest
	72	+	ClientID [16]byte
	73	+	Geometry domain.Geometry
	74	+	TermEnv string
	75	+	Cwd string
	76	+	TrueColor bool
	77	+	// Capabilities are the outer terminal's probed capabilities, declared in
	78	+	// Hello.
	79	+	Capabilities terminalCapabilities
77	80		SessionEnvironment SessionEnvironment
78	81		// BeforeAttached runs after the initial frame commits but before attached
79	82		// presentation becomes observable. A failure keeps the run unattached.

@@ -705,19 +708,23 @@ func (w *sessionAttachmentWorker) hello(stream ports.BrokerLogicalConnection) pr
705	708		environmentPolicy = protocol.EnvironmentPolicyDaemonOwned
706	709		}
707	710		hello := protocol.Hello{
708		-	Version: protocol.Version,
709		-	Intent: protocol.IntentAttach,
710		-	ClientID: w.cfg.ClientID,
711		-	Size: geometry.Size,
712		-	PixelWidth: geometry.PixelWidth,
713		-	PixelHeight: geometry.PixelHeight,
714		-	TermEnv: w.cfg.TermEnv,
715		-	Cwd: cwd,
716		-	TrueColor: w.cfg.TrueColor,
717		-	MaxOutputInFlight: requestedOutputWindow(stream),
718		-	Env: env,
719		-	EnvironmentPolicy: environmentPolicy,
720		-	Remote: !request.Local,
	711	+	Version: protocol.Version,
	712	+	Intent: protocol.IntentAttach,
	713	+	ClientID: w.cfg.ClientID,
	714	+	Size: geometry.Size,
	715	+	PixelWidth: geometry.PixelWidth,
	716	+	PixelHeight: geometry.PixelHeight,
	717	+	TermEnv: w.cfg.TermEnv,
	718	+	Cwd: cwd,
	719	+	TrueColor: w.cfg.TrueColor,
	720	+	// A remote attach reaches the terminal through this client, so both
	721	+	// declarations describe this client's outer terminal.
	722	+	KittyDirectGraphics: w.cfg.Capabilities.KittyGraphics,
	723	+	KittyKeyboard: w.cfg.Capabilities.KittyKeyboard,
	724	+	MaxOutputInFlight: requestedOutputWindow(stream),
	725	+	Env: env,
	726	+	EnvironmentPolicy: environmentPolicy,
	727	+	Remote: !request.Local,
721	728		}
722	729		switch request.Admission {
723	730		case ports.BrokerAdmissionExact:


@@ -68,12 +68,15 @@ func (e *AttachmentIdentityError) Error() string {
68		// The request is the exact request the supervisor opened the stream with; the	68		// The request is the exact request the supervisor opened the stream with; the
69		// rest is client-local presentation data the worker mirrors into Hello.	69		// rest is client-local presentation data the worker mirrors into Hello.
70		type sessionAttachmentConfig struct {	70		type sessionAttachmentConfig struct {
71	-	Request ports.BrokerOpenStreamRequest	71	+	Request ports.BrokerOpenStreamRequest
72	-	ClientID [16]byte	72	+	ClientID [16]byte
73	-	Geometry domain.Geometry	73	+	Geometry domain.Geometry
74	-	TermEnv string	74	+	TermEnv string
75	-	Cwd string	75	+	Cwd string
76	-	TrueColor bool	76	+	TrueColor bool
			77	+	// Capabilities are the outer terminal's probed capabilities, declared in
			78	+	// Hello.
			79	+	Capabilities terminalCapabilities
77		SessionEnvironment SessionEnvironment	80		SessionEnvironment SessionEnvironment
78		// BeforeAttached runs after the initial frame commits but before attached	81		// BeforeAttached runs after the initial frame commits but before attached
79		// presentation becomes observable. A failure keeps the run unattached.	82		// presentation becomes observable. A failure keeps the run unattached.

@@ -705,19 +708,23 @@ func (w *sessionAttachmentWorker) hello(stream ports.BrokerLogicalConnection) pr
705		environmentPolicy = protocol.EnvironmentPolicyDaemonOwned	708		environmentPolicy = protocol.EnvironmentPolicyDaemonOwned
706		}	709		}
707		hello := protocol.Hello{	710		hello := protocol.Hello{
708	-	Version: protocol.Version,	711	+	Version: protocol.Version,
709	-	Intent: protocol.IntentAttach,	712	+	Intent: protocol.IntentAttach,
710	-	ClientID: w.cfg.ClientID,	713	+	ClientID: w.cfg.ClientID,
711	-	Size: geometry.Size,	714	+	Size: geometry.Size,
712	-	PixelWidth: geometry.PixelWidth,	715	+	PixelWidth: geometry.PixelWidth,
713	-	PixelHeight: geometry.PixelHeight,	716	+	PixelHeight: geometry.PixelHeight,
714	-	TermEnv: w.cfg.TermEnv,	717	+	TermEnv: w.cfg.TermEnv,
715	-	Cwd: cwd,	718	+	Cwd: cwd,
716	-	TrueColor: w.cfg.TrueColor,	719	+	TrueColor: w.cfg.TrueColor,
717	-	MaxOutputInFlight: requestedOutputWindow(stream),	720	+	// A remote attach reaches the terminal through this client, so both
718	-	Env: env,	721	+	// declarations describe this client's outer terminal.
719	-	EnvironmentPolicy: environmentPolicy,	722	+	KittyDirectGraphics: w.cfg.Capabilities.KittyGraphics,
720	-	Remote: !request.Local,	723	+	KittyKeyboard: w.cfg.Capabilities.KittyKeyboard,
			724	+	MaxOutputInFlight: requestedOutputWindow(stream),
			725	+	Env: env,
			726	+	EnvironmentPolicy: environmentPolicy,
			727	+	Remote: !request.Local,
721		}	728		}
722		switch request.Admission {	729		switch request.Admission {
723		case ports.BrokerAdmissionExact:	730		case ports.BrokerAdmissionExact:

M internal/usecase/client/attachment_worker_test.go +2 -0


@@ -122,6 +122,8 @@ func newWorkerTestTerminal() *workerTestTerminal {
122	122		return &workerTestTerminal{resizes: make(chan domain.Geometry, 4)}
123	123		}
124	124
	125	+	func (t *workerTestTerminal) EnableKittyKeyboard(int) error { return nil }
	126	+
125	127		func (t *workerTestTerminal) EnterRaw() (func() error, error) {
126	128		return func() error {
127	129		t.mu.Lock()


@@ -122,6 +122,8 @@ func newWorkerTestTerminal() *workerTestTerminal {
122	return &workerTestTerminal{resizes: make(chan domain.Geometry, 4)}	122		return &workerTestTerminal{resizes: make(chan domain.Geometry, 4)}
123	}	123		}
124		124
		125	+	func (t *workerTestTerminal) EnableKittyKeyboard(int) error { return nil }
		126	+
125	func (t *workerTestTerminal) EnterRaw() (func() error, error) {	127		func (t *workerTestTerminal) EnterRaw() (func() error, error) {
126	return func() error {	128		return func() error {
127	t.mu.Lock()	129		t.mu.Lock()

M internal/usecase/client/clipboard_intercept.go +28 -6


@@ -8,6 +8,7 @@ import (
8	8
9	9		"github.com/bnema/vev/internal/ports"
10	10		"github.com/bnema/vev/internal/protocol"
	11	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
11	12		)
12	13
13	14		// ctrlV is the byte a Ctrl+V keypress sends on the wire.

@@ -67,7 +68,7 @@ func (c *clipboardIntercept) Scan(data []byte) {
67	68		boundary := pasteMarkerBoundary(data)
68	69		segment := data[:boundary]
69	70		for len(segment) > 0 {
70		-	idx := bytes.IndexByte(segment, ctrlV)
	71	+	idx, size := indexCtrlV(segment)
71	72		if idx < 0 {
72	73		c.next(segment)
73	74		break

@@ -75,8 +76,9 @@ func (c *clipboardIntercept) Scan(data []byte) {
75	76		if idx > 0 {
76	77		c.next(segment[:idx])
77	78		}
78		-	segment = segment[idx+1:]
79		-	c.handleCtrlV()
	79	+	raw := segment[idx : idx+size]
	80	+	segment = segment[idx+size:]
	81	+	c.handleCtrlV(raw)
80	82		}
81	83
82	84		// Bytes at/after boundary are (the possible start of) a bracketed

@@ -104,7 +106,27 @@ func pasteMarkerBoundary(data []byte) int {
104	106		return len(data)
105	107		}
106	108
107		-	func (c *clipboardIntercept) handleCtrlV() {
	109	+	// indexCtrlV finds the first Ctrl+V keypress: the legacy 0x16 byte or a
	110	+	// kitty keyboard protocol press of Ctrl+V on any layout.
	111	+	func indexCtrlV(data []byte) (idx, size int) {
	112	+	for i, b := range data {
	113	+	switch b {
	114	+	case ctrlV:
	115	+	return i, 1
	116	+	case 0x1b:
	117	+	if ev, n, ok, _ := kittykey.Parse(data[i:]); ok && isKittyCtrlV(ev) {
	118	+	return i, n
	119	+	}
	120	+	}
	121	+	}
	122	+	return -1, 0
	123	+	}
	124	+
	125	+	func isKittyCtrlV(ev kittykey.Event) bool {
	126	+	return !ev.Release && ev.Mods == kittykey.ModCtrl && (ev.Code == 'v' \|\| ev.Base == 'v')
	127	+	}
	128	+
	129	+	func (c *clipboardIntercept) handleCtrlV(raw []byte) {
108	130		ctx := c.ctx
109	131		if ctx == nil {
110	132		ctx = context.Background()

@@ -117,7 +139,7 @@ func (c *clipboardIntercept) handleCtrlV() {
117	139		c.sendNotice(protocol.ClientNoticeClipboardFallback)
118	140		}
119	141		}
120		-	c.next([]byte{ctrlV})
	142	+	c.next(raw)
121	143		return
122	144		}
123	145		if len(data) > maxClipboardImagePush {

@@ -125,7 +147,7 @@ func (c *clipboardIntercept) handleCtrlV() {
125	147		if c.sendNotice != nil {
126	148		c.sendNotice(protocol.ClientNoticeClipboardTooLarge)
127	149		}
128		-	c.next([]byte{ctrlV})
	150	+	c.next(raw)
129	151		return
130	152		}
131	153		c.sendImage(mime, data)

 	"github.com/bnema/vev/internal/ports"
 	"github.com/bnema/vev/internal/protocol"
+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
 )
 // ctrlV is the byte a Ctrl+V keypress sends on the wire.
 	boundary := pasteMarkerBoundary(data)
 	segment := data[:boundary]
 	for len(segment) > 0 {
-		idx := bytes.IndexByte(segment, ctrlV)
+		idx, size := indexCtrlV(segment)
 		if idx < 0 {
 			c.next(segment)
 			break
 		if idx > 0 {
 			c.next(segment[:idx])
 		}
-		segment = segment[idx+1:]
+		raw := segment[idx : idx+size]
-		c.handleCtrlV()
+		segment = segment[idx+size:]
+		c.handleCtrlV(raw)
 	}
 	// Bytes at/after boundary are (the possible start of) a bracketed
 	return len(data)
 }
-func (c *clipboardIntercept) handleCtrlV() {
+// indexCtrlV finds the first Ctrl+V keypress: the legacy 0x16 byte or a
+// kitty keyboard protocol press of Ctrl+V on any layout.
+func indexCtrlV(data []byte) (idx, size int) {
+	for i, b := range data {
+		switch b {
+		case ctrlV:
+			return i, 1
+		case 0x1b:
+			if ev, n, ok, _ := kittykey.Parse(data[i:]); ok && isKittyCtrlV(ev) {
+				return i, n
+			}
+		}
+	}
+	return -1, 0
+}
+func isKittyCtrlV(ev kittykey.Event) bool {
+	return !ev.Release && ev.Mods == kittykey.ModCtrl && (ev.Code == 'v' || ev.Base == 'v')
+}
+func (c *clipboardIntercept) handleCtrlV(raw []byte) {
 	ctx := c.ctx
 	if ctx == nil {
 		ctx = context.Background()
 				c.sendNotice(protocol.ClientNoticeClipboardFallback)
 			}
 		}
-		c.next([]byte{ctrlV})
+		c.next(raw)
 		return
 	}
 	if len(data) > maxClipboardImagePush {
 		if c.sendNotice != nil {
 			c.sendNotice(protocol.ClientNoticeClipboardTooLarge)
 		}
-		c.next([]byte{ctrlV})
+		c.next(raw)
 		return
 	}
 	c.sendImage(mime, data)

A internal/usecase/client/clipboard_intercept_test.go +56 -0

@@ -0,0 +1,56 @@
	1	+	package client
	2	+
	3	+	import (
	4	+	"io"
	5	+	"log/slog"
	6	+	"testing"
	7	+
	8	+	"github.com/stretchr/testify/mock"
	9	+	"github.com/stretchr/testify/require"
	10	+
	11	+	"github.com/bnema/vev/internal/ports"
	12	+	portsmocks "github.com/bnema/vev/internal/ports/mocks"
	13	+	)
	14	+
	15	+	func TestClipboardInterceptCtrlV(t *testing.T) {
	16	+	tests := []struct {
	17	+	name string
	18	+	in string
	19	+	hasImage bool
	20	+	reads bool
	21	+	wantNext []string
	22	+	wantImages int
	23	+	}{
	24	+	{name: "legacy with image", in: "a\x16b", hasImage: true, wantNext: []string{"a", "b"}, wantImages: 1},
	25	+	{name: "kitty with image", in: "a\x1b[118;5ub", hasImage: true, wantNext: []string{"a", "b"}, wantImages: 1},
	26	+	{name: "legacy without image forwards byte", in: "\x16", reads: true, wantNext: []string{"\x16"}},
	27	+	{name: "kitty without image forwards sequence", in: "\x1b[118;5u", reads: true, wantNext: []string{"\x1b[118;5u"}},
	28	+	{name: "kitty cyrillic layout base key", in: "\x1b[1084::118;5u", hasImage: true, wantImages: 1},
	29	+	{name: "kitty with caps lock", in: "\x1b[118;69u", hasImage: true, wantImages: 1},
	30	+	{name: "kitty release ignored", in: "\x1b[118;5:3u", wantNext: []string{"\x1b[118;5:3u"}},
	31	+	{name: "other kitty key untouched", in: "\x1b[118;7u", wantNext: []string{"\x1b[118;7u"}},
	32	+	{name: "inside paste untouched", in: "\x1b[200~\x1b[118;5u\x1b[201~", wantNext: []string{"\x1b[200~\x1b[118;5u\x1b[201~"}},
	33	+	}
	34	+	for _, tt := range tests {
	35	+	t.Run(tt.name, func(t *testing.T) {
	36	+	reader := portsmocks.NewMockClipboardReader(t)
	37	+	if tt.hasImage {
	38	+	reader.EXPECT().ReadImage(mock.Anything).Return("image/png", []byte{1}, nil).Times(tt.wantImages)
	39	+	} else if tt.reads {
	40	+	reader.EXPECT().ReadImage(mock.Anything).Return("", nil, ports.ErrNoClipboardImage).Once()
	41	+	}
	42	+	var next []string
	43	+	images := 0
	44	+	c := &clipboardIntercept{
	45	+	coalescer: newPasteCoalescer(nil, func([]byte) {}),
	46	+	reader: reader,
	47	+	log: slog.New(slog.NewTextHandler(io.Discard, nil)),
	48	+	sendImage: func(string, []byte) { images++ },
	49	+	next: func(b []byte) { next = append(next, string(b)) },
	50	+	}
	51	+	c.Scan([]byte(tt.in))
	52	+	require.Equal(t, tt.wantNext, next)
	53	+	require.Equal(t, tt.wantImages, images)
	54	+	})
	55	+	}
	56	+	}

@@ -0,0 +1,56 @@
	1	+	package client
	2	+
	3	+	import (
	4	+	"io"
	5	+	"log/slog"
	6	+	"testing"
	7	+
	8	+	"github.com/stretchr/testify/mock"
	9	+	"github.com/stretchr/testify/require"
	10	+
	11	+	"github.com/bnema/vev/internal/ports"
	12	+	portsmocks "github.com/bnema/vev/internal/ports/mocks"
	13	+	)
	14	+
	15	+	func TestClipboardInterceptCtrlV(t *testing.T) {
	16	+	tests := []struct {
	17	+	name string
	18	+	in string
	19	+	hasImage bool
	20	+	reads bool
	21	+	wantNext []string
	22	+	wantImages int
	23	+	}{
	24	+	{name: "legacy with image", in: "a\x16b", hasImage: true, wantNext: []string{"a", "b"}, wantImages: 1},
	25	+	{name: "kitty with image", in: "a\x1b[118;5ub", hasImage: true, wantNext: []string{"a", "b"}, wantImages: 1},
	26	+	{name: "legacy without image forwards byte", in: "\x16", reads: true, wantNext: []string{"\x16"}},
	27	+	{name: "kitty without image forwards sequence", in: "\x1b[118;5u", reads: true, wantNext: []string{"\x1b[118;5u"}},
	28	+	{name: "kitty cyrillic layout base key", in: "\x1b[1084::118;5u", hasImage: true, wantImages: 1},
	29	+	{name: "kitty with caps lock", in: "\x1b[118;69u", hasImage: true, wantImages: 1},
	30	+	{name: "kitty release ignored", in: "\x1b[118;5:3u", wantNext: []string{"\x1b[118;5:3u"}},
	31	+	{name: "other kitty key untouched", in: "\x1b[118;7u", wantNext: []string{"\x1b[118;7u"}},
	32	+	{name: "inside paste untouched", in: "\x1b[200~\x1b[118;5u\x1b[201~", wantNext: []string{"\x1b[200~\x1b[118;5u\x1b[201~"}},
	33	+	}
	34	+	for _, tt := range tests {
	35	+	t.Run(tt.name, func(t *testing.T) {
	36	+	reader := portsmocks.NewMockClipboardReader(t)
	37	+	if tt.hasImage {
	38	+	reader.EXPECT().ReadImage(mock.Anything).Return("image/png", []byte{1}, nil).Times(tt.wantImages)
	39	+	} else if tt.reads {
	40	+	reader.EXPECT().ReadImage(mock.Anything).Return("", nil, ports.ErrNoClipboardImage).Once()
	41	+	}
	42	+	var next []string
	43	+	images := 0
	44	+	c := &clipboardIntercept{
	45	+	coalescer: newPasteCoalescer(nil, func([]byte) {}),
	46	+	reader: reader,
	47	+	log: slog.New(slog.NewTextHandler(io.Discard, nil)),
	48	+	sendImage: func(string, []byte) { images++ },
	49	+	next: func(b []byte) { next = append(next, string(b)) },
	50	+	}
	51	+	c.Scan([]byte(tt.in))
	52	+	require.Equal(t, tt.wantNext, next)
	53	+	require.Equal(t, tt.wantImages, images)
	54	+	})
	55	+	}
	56	+	}

M internal/usecase/client/move_picker_overlay.go +3 -0


@@ -8,6 +8,7 @@ import (
8	8		"github.com/bnema/vev/internal/domain"
9	9		"github.com/bnema/vev/internal/ports"
10	10		"github.com/bnema/vev/internal/protocol"
	11	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
11	12		pickerusecase "github.com/bnema/vev/internal/usecase/picker"
12	13		)
13	14

@@ -230,6 +231,8 @@ func (p *attachmentMovePicker) release() {
230	231		// supervised when the supervisor-owned navigation picker consumed them: its
231	232		// action is then settled by the supervisor, never fenced through the daemon.
232	233		func (p *attachmentMovePicker) consumeInput(ctx context.Context, state outputApplyState, input AttachmentInputEvent) (consumed, supervised bool, err error) {
	234	+	// Overlays decode legacy keys; the session path keeps kitty sequences.
	235	+	input.Data = kittykey.Translate(input.Data, 0)
233	236		if p.move.presenting {
234	237		p.stopEscape()
235	238		op, changed := p.move.input(input.Data, input.actionID)


@@ -8,6 +8,7 @@ import (
8	"github.com/bnema/vev/internal/domain"	8		"github.com/bnema/vev/internal/domain"
9	"github.com/bnema/vev/internal/ports"	9		"github.com/bnema/vev/internal/ports"
10	"github.com/bnema/vev/internal/protocol"	10		"github.com/bnema/vev/internal/protocol"
		11	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
11	pickerusecase "github.com/bnema/vev/internal/usecase/picker"	12		pickerusecase "github.com/bnema/vev/internal/usecase/picker"
12	)	13		)
13		14

@@ -230,6 +231,8 @@ func (p *attachmentMovePicker) release() {
230	// supervised when the supervisor-owned navigation picker consumed them: its	231		// supervised when the supervisor-owned navigation picker consumed them: its
231	// action is then settled by the supervisor, never fenced through the daemon.	232		// action is then settled by the supervisor, never fenced through the daemon.
232	func (p *attachmentMovePicker) consumeInput(ctx context.Context, state outputApplyState, input AttachmentInputEvent) (consumed, supervised bool, err error) {	233		func (p *attachmentMovePicker) consumeInput(ctx context.Context, state outputApplyState, input AttachmentInputEvent) (consumed, supervised bool, err error) {
		234	+	// Overlays decode legacy keys; the session path keeps kitty sequences.
		235	+	input.Data = kittykey.Translate(input.Data, 0)
233	if p.move.presenting {	236		if p.move.presenting {
234	p.stopEscape()	237		p.stopEscape()
235	op, changed := p.move.input(input.Data, input.actionID)	238		op, changed := p.move.input(input.Data, input.actionID)

M internal/usecase/client/picker_composition.go +4 -1


@@ -6,6 +6,7 @@ import (
6	6		"github.com/bnema/vev/internal/domain"
7	7		"github.com/bnema/vev/internal/ports"
8	8		"github.com/bnema/vev/internal/protocol"
	9	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
9	10		)
10	11
11	12		// Picker is the composition seam over the client-owned picker.

@@ -157,7 +158,9 @@ func (p *Picker) ConsumeTerminalRead(data []byte) bool {
157	158		if p == nil \|\| p.controller == nil {
158	159		return false
159	160		}
160		-	return p.controller.ConsumeTerminalRead(data)
	161	+	// The picker decodes legacy keys; kitty keyboard sequences are
	162	+	// translated back before it sees them.
	163	+	return p.controller.ConsumeTerminalRead(kittykey.Translate(data, 0))
161	164		}
162	165
163	166		// Render returns the current picker frame for size, or nil when no catalogue

 	"github.com/bnema/vev/internal/domain"
 	"github.com/bnema/vev/internal/ports"
 	"github.com/bnema/vev/internal/protocol"
+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
 )
 // Picker is the composition seam over the client-owned picker.
 	if p == nil || p.controller == nil {
 		return false
 	}
-	return p.controller.ConsumeTerminalRead(data)
+	// The picker decodes legacy keys; kitty keyboard sequences are
+	// translated back before it sees them.
+	return p.controller.ConsumeTerminalRead(kittykey.Translate(data, 0))
 }
 // Render returns the current picker frame for size, or nil when no catalogue

M internal/usecase/client/picker_controller_test.go +2 -0


@@ -83,6 +83,8 @@ type pickerRecordingTerminal struct {
83	83		enters int
84	84		}
85	85
	86	+	func (t *pickerRecordingTerminal) EnableKittyKeyboard(int) error { return nil }
	87	+
86	88		func (t *pickerRecordingTerminal) EnterRaw() (func() error, error) {
87	89		t.mu.Lock()
88	90		t.enters++


@@ -83,6 +83,8 @@ type pickerRecordingTerminal struct {
83	enters int	83		enters int
84	}	84		}
85		85
		86	+	func (t *pickerRecordingTerminal) EnableKittyKeyboard(int) error { return nil }
		87	+
86	func (t *pickerRecordingTerminal) EnterRaw() (func() error, error) {	88		func (t *pickerRecordingTerminal) EnterRaw() (func() error, error) {
87	t.mu.Lock()	89		t.mu.Lock()
88	t.enters++	90		t.enters++

M internal/usecase/client/supervisor.go +43 -1


@@ -14,6 +14,7 @@ import (
14	14
15	15		"github.com/bnema/vev/internal/domain"
16	16		"github.com/bnema/vev/internal/ports"
	17	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
17	18		)
18	19
19	20		// Autonomous client supervisor.

@@ -384,6 +385,12 @@ type AttachmentEnvironment struct {
384	385		TermEnv string
385	386		Cwd string
386	387		TrueColor bool
	388	+	// ProbeTerminal enables the one bounded capability probe of a real outer
	389	+	// terminal (Kitty graphics and keyboard). Virtual terminals leave it off.
	390	+	ProbeTerminal bool
	391	+	// KittyKeyboard enables the kitty keyboard protocol when the probe finds
	392	+	// it, which makes Ctrl+1..9 recent-session switching available.
	393	+	KittyKeyboard bool
387	394		}
388	395
389	396		// AttachmentLifecycleAction is an explicit process/attachment decision.

@@ -435,6 +442,9 @@ type Supervisor struct {
435	442		// theme retains the terminal-reported colors across attachments, so a
436	443		// replacement attachment restores them before its own palette query ends.
437	444		theme terminalThemeState
	445	+	// capabilities is the outer terminal's probed and enabled capabilities,
	446	+	// written once in Run before any attachment starts.
	447	+	capabilities terminalCapabilities
438	448		// readySub is the adopted connection's subscription while the ready phase
439	449		// runs, so the picker overlay over a live attachment keeps folding broker
440	450		// publications. It is only touched from the run goroutine.

@@ -564,7 +574,9 @@ func (s *Supervisor) Run(ctx context.Context) (retErr error) {
564	574		}
565	575		}()
566	576
567		-	input := startTerminalInputLifetime(s.cfg.Terminal.In(), s.cfg.Picker)
	577	+	input := startTerminalInputLifetimeWith(s.cfg.Terminal.In(), s.cfg.Picker, func(pump *terminalInputPump) {
	578	+	s.detectTerminalCapabilities(ctx, pump)
	579	+	})
568	580		defer input.stop()
569	581		s.attachments.setInput(input.pump)
570	582		s.attachments.startGeometry(ctx)

@@ -1311,6 +1323,13 @@ type terminalInputLifetime struct {
1311	1323		// treated as an immediate orderly EOF. A nil consumer discards read bytes; a
1312	1324		// non-nil consumer owns them for the picker presentation.
1313	1325		func startTerminalInputLifetime(in io.Reader, consumer pickerInputConsumer) *terminalInputLifetime {
	1326	+	return startTerminalInputLifetimeWith(in, consumer, nil)
	1327	+	}
	1328	+
	1329	+	// startTerminalInputLifetimeWith runs beforeConsumers on the started pump
	1330	+	// before the picker may claim it, so a terminal probe sees its responses
	1331	+	// first and hands every other byte on to the picker.
	1332	+	func startTerminalInputLifetimeWith(in io.Reader, consumer pickerInputConsumer, beforeConsumers func(terminalInputPump)) terminalInputLifetime {
1314	1333		lifetime := &terminalInputLifetime{eof: make(chan error, 1), consumer: consumer}
1315	1334		if supervisorNil(in) {
1316	1335		lifetime.finish(io.EOF)

@@ -1318,6 +1337,9 @@ func startTerminalInputLifetime(in io.Reader, consumer pickerInputConsumer) *ter
1318	1337		}
1319	1338		lifetime.pump = newTerminalInputPump(in)
1320	1339		lifetime.pump.start()
	1340	+	if beforeConsumers != nil {
	1341	+	beforeConsumers(lifetime.pump)
	1342	+	}
1321	1343		if consumer != nil {
1322	1344		lifetime.acquirePicker()
1323	1345		}

@@ -1444,3 +1466,23 @@ func supervisorNil(dependency any) bool {
1444	1466		return false
1445	1467		}
1446	1468		}
	1469	+
	1470	+	// detectTerminalCapabilities probes the outer terminal once and enables the
	1471	+	// kitty keyboard protocol when it is supported and wanted. It runs in Run
	1472	+	// before any input consumer or attachment exists.
	1473	+	func (s Supervisor) detectTerminalCapabilities(ctx context.Context, pump terminalInputPump) {
	1474	+	env := s.cfg.AttachmentEnvironment
	1475	+	if !env.ProbeTerminal {
	1476	+	return
	1477	+	}
	1478	+	caps := probeTerminalCapabilities(ctx, s.cfg.Terminal, s.cfg.Clock, pump)
	1479	+	if caps.KittyKeyboard && env.KittyKeyboard {
	1480	+	if err := s.cfg.Terminal.EnableKittyKeyboard(kittykey.OuterFlags); err != nil {
	1481	+	s.logger.Warn("enabling kitty keyboard protocol failed", "err", err)
	1482	+	caps.KittyKeyboard = false
	1483	+	}
	1484	+	} else {
	1485	+	caps.KittyKeyboard = false
	1486	+	}
	1487	+	s.capabilities = caps
	1488	+	}


@@ -14,6 +14,7 @@ import (
14			14
15		"github.com/bnema/vev/internal/domain"	15		"github.com/bnema/vev/internal/domain"
16		"github.com/bnema/vev/internal/ports"	16		"github.com/bnema/vev/internal/ports"
			17	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
17		)	18		)
18			19
19		// Autonomous client supervisor.	20		// Autonomous client supervisor.

@@ -384,6 +385,12 @@ type AttachmentEnvironment struct {
384		TermEnv string	385		TermEnv string
385		Cwd string	386		Cwd string
386		TrueColor bool	387		TrueColor bool
			388	+	// ProbeTerminal enables the one bounded capability probe of a real outer
			389	+	// terminal (Kitty graphics and keyboard). Virtual terminals leave it off.
			390	+	ProbeTerminal bool
			391	+	// KittyKeyboard enables the kitty keyboard protocol when the probe finds
			392	+	// it, which makes Ctrl+1..9 recent-session switching available.
			393	+	KittyKeyboard bool
387		}	394		}
388			395
389		// AttachmentLifecycleAction is an explicit process/attachment decision.	396		// AttachmentLifecycleAction is an explicit process/attachment decision.

@@ -435,6 +442,9 @@ type Supervisor struct {
435		// theme retains the terminal-reported colors across attachments, so a	442		// theme retains the terminal-reported colors across attachments, so a
436		// replacement attachment restores them before its own palette query ends.	443		// replacement attachment restores them before its own palette query ends.
437		theme terminalThemeState	444		theme terminalThemeState
			445	+	// capabilities is the outer terminal's probed and enabled capabilities,
			446	+	// written once in Run before any attachment starts.
			447	+	capabilities terminalCapabilities
438		// readySub is the adopted connection's subscription while the ready phase	448		// readySub is the adopted connection's subscription while the ready phase
439		// runs, so the picker overlay over a live attachment keeps folding broker	449		// runs, so the picker overlay over a live attachment keeps folding broker
440		// publications. It is only touched from the run goroutine.	450		// publications. It is only touched from the run goroutine.

@@ -564,7 +574,9 @@ func (s *Supervisor) Run(ctx context.Context) (retErr error) {
564		}	574		}
565		}()	575		}()
566			576
567	-	input := startTerminalInputLifetime(s.cfg.Terminal.In(), s.cfg.Picker)	577	+	input := startTerminalInputLifetimeWith(s.cfg.Terminal.In(), s.cfg.Picker, func(pump *terminalInputPump) {
			578	+	s.detectTerminalCapabilities(ctx, pump)
			579	+	})
568		defer input.stop()	580		defer input.stop()
569		s.attachments.setInput(input.pump)	581		s.attachments.setInput(input.pump)
570		s.attachments.startGeometry(ctx)	582		s.attachments.startGeometry(ctx)

@@ -1311,6 +1323,13 @@ type terminalInputLifetime struct {
1311		// treated as an immediate orderly EOF. A nil consumer discards read bytes; a	1323		// treated as an immediate orderly EOF. A nil consumer discards read bytes; a
1312		// non-nil consumer owns them for the picker presentation.	1324		// non-nil consumer owns them for the picker presentation.
1313		func startTerminalInputLifetime(in io.Reader, consumer pickerInputConsumer) *terminalInputLifetime {	1325		func startTerminalInputLifetime(in io.Reader, consumer pickerInputConsumer) *terminalInputLifetime {
			1326	+	return startTerminalInputLifetimeWith(in, consumer, nil)
			1327	+	}
			1328	+
			1329	+	// startTerminalInputLifetimeWith runs beforeConsumers on the started pump
			1330	+	// before the picker may claim it, so a terminal probe sees its responses
			1331	+	// first and hands every other byte on to the picker.
			1332	+	func startTerminalInputLifetimeWith(in io.Reader, consumer pickerInputConsumer, beforeConsumers func(terminalInputPump)) terminalInputLifetime {
1314		lifetime := &terminalInputLifetime{eof: make(chan error, 1), consumer: consumer}	1333		lifetime := &terminalInputLifetime{eof: make(chan error, 1), consumer: consumer}
1315		if supervisorNil(in) {	1334		if supervisorNil(in) {
1316		lifetime.finish(io.EOF)	1335		lifetime.finish(io.EOF)

@@ -1318,6 +1337,9 @@ func startTerminalInputLifetime(in io.Reader, consumer pickerInputConsumer) *ter
1318		}	1337		}
1319		lifetime.pump = newTerminalInputPump(in)	1338		lifetime.pump = newTerminalInputPump(in)
1320		lifetime.pump.start()	1339		lifetime.pump.start()
			1340	+	if beforeConsumers != nil {
			1341	+	beforeConsumers(lifetime.pump)
			1342	+	}
1321		if consumer != nil {	1343		if consumer != nil {
1322		lifetime.acquirePicker()	1344		lifetime.acquirePicker()
1323		}	1345		}

@@ -1444,3 +1466,23 @@ func supervisorNil(dependency any) bool {
1444		return false	1466		return false
1445		}	1467		}
1446		}	1468		}
			1469	+
			1470	+	// detectTerminalCapabilities probes the outer terminal once and enables the
			1471	+	// kitty keyboard protocol when it is supported and wanted. It runs in Run
			1472	+	// before any input consumer or attachment exists.
			1473	+	func (s Supervisor) detectTerminalCapabilities(ctx context.Context, pump terminalInputPump) {
			1474	+	env := s.cfg.AttachmentEnvironment
			1475	+	if !env.ProbeTerminal {
			1476	+	return
			1477	+	}
			1478	+	caps := probeTerminalCapabilities(ctx, s.cfg.Terminal, s.cfg.Clock, pump)
			1479	+	if caps.KittyKeyboard && env.KittyKeyboard {
			1480	+	if err := s.cfg.Terminal.EnableKittyKeyboard(kittykey.OuterFlags); err != nil {
			1481	+	s.logger.Warn("enabling kitty keyboard protocol failed", "err", err)
			1482	+	caps.KittyKeyboard = false
			1483	+	}
			1484	+	} else {
			1485	+	caps.KittyKeyboard = false
			1486	+	}
			1487	+	s.capabilities = caps
			1488	+	}

M internal/usecase/client/supervisor_attach.go +1 -0


@@ -325,6 +325,7 @@ func (s *Supervisor) newAttachmentWorker(request ports.BrokerOpenStreamRequest,
325	325		TermEnv: environment.TermEnv,
326	326		Cwd: environment.Cwd,
327	327		TrueColor: environment.TrueColor,
	328	+	Capabilities: s.capabilities,
328	329		SessionEnvironment: sessionEnv,
329	330		BeforeAttached: beforeAttached,
330	331		Clock: s.cfg.Clock,


@@ -325,6 +325,7 @@ func (s *Supervisor) newAttachmentWorker(request ports.BrokerOpenStreamRequest,
325	TermEnv: environment.TermEnv,	325		TermEnv: environment.TermEnv,
326	Cwd: environment.Cwd,	326		Cwd: environment.Cwd,
327	TrueColor: environment.TrueColor,	327		TrueColor: environment.TrueColor,
		328	+	Capabilities: s.capabilities,
328	SessionEnvironment: sessionEnv,	329		SessionEnvironment: sessionEnv,
329	BeforeAttached: beforeAttached,	330		BeforeAttached: beforeAttached,
330	Clock: s.cfg.Clock,	331		Clock: s.cfg.Clock,

M internal/usecase/client/supervisor_attach_test.go +2 -0


@@ -62,6 +62,8 @@ type attachTestEvent struct {
62	62		state uint64
63	63		}
64	64
	65	+	func (t *attachTestTerminal) EnableKittyKeyboard(int) error { return nil }
	66	+
65	67		func (t *attachTestTerminal) EnterRaw() (func() error, error) {
66	68		return func() error {
67	69		t.mu.Lock()


@@ -62,6 +62,8 @@ type attachTestEvent struct {
62	state uint64	62		state uint64
63	}	63		}
64		64
		65	+	func (t *attachTestTerminal) EnableKittyKeyboard(int) error { return nil }
		66	+
65	func (t *attachTestTerminal) EnterRaw() (func() error, error) {	67		func (t *attachTestTerminal) EnterRaw() (func() error, error) {
66	return func() error {	68		return func() error {
67	t.mu.Lock()	69		t.mu.Lock()

M internal/usecase/client/supervisor_test.go +2 -0


@@ -140,6 +140,8 @@ func newSupervisorTestTerminal(in io.Reader) *supervisorTestTerminal {
140	140		return &supervisorTestTerminal{in: in}
141	141		}
142	142
	143	+	func (t *supervisorTestTerminal) EnableKittyKeyboard(int) error { return nil }
	144	+
143	145		func (t *supervisorTestTerminal) EnterRaw() (func() error, error) {
144	146		if t.enterErr != nil {
145	147		return nil, t.enterErr


@@ -140,6 +140,8 @@ func newSupervisorTestTerminal(in io.Reader) *supervisorTestTerminal {
140	return &supervisorTestTerminal{in: in}	140		return &supervisorTestTerminal{in: in}
141	}	141		}
142		142
		143	+	func (t *supervisorTestTerminal) EnableKittyKeyboard(int) error { return nil }
		144	+
143	func (t *supervisorTestTerminal) EnterRaw() (func() error, error) {	145		func (t *supervisorTestTerminal) EnterRaw() (func() error, error) {
144	if t.enterErr != nil {	146		if t.enterErr != nil {
145	return nil, t.enterErr	147		return nil, t.enterErr

A internal/usecase/client/terminal_probe.go +80 -0

@@ -0,0 +1,80 @@
	1	+	package client
	2	+
	3	+	import (
	4	+	"context"
	5	+	"time"
	6	+
	7	+	"github.com/bnema/vev-vt/protocol/terminalquery"
	8	+
	9	+	"github.com/bnema/vev/internal/ports"
	10	+	)
	11	+
	12	+	// terminalCapabilityProbeTimeout bounds the outer-terminal capability probe.
	13	+	// DA1 answers first on any terminal, so a real terminal finishes far sooner.
	14	+	const terminalCapabilityProbeTimeout = 150 * time.Millisecond
	15	+
	16	+	// terminalCapabilities is what the outer terminal declared to the probe.
	17	+	type terminalCapabilities struct {
	18	+	KittyGraphics bool
	19	+	KittyKeyboard bool
	20	+	}
	21	+
	22	+	// probeTerminalCapabilities performs one bounded probe of the outer terminal
	23	+	// through the lifecycle's only input pump. It must run before any other
	24	+	// consumer claims input. Probe responses are removed; every unrelated byte is
	25	+	// kept, in order, for the next consumer.
	26	+	func probeTerminalCapabilities(ctx context.Context, terminal ports.Terminal, clock ports.Clock, input *terminalInputPump) terminalCapabilities {
	27	+	if input == nil \|\| supervisorNil(terminal) \|\| supervisorNil(clock) {
	28	+	return terminalCapabilities{}
	29	+	}
	30	+	consumer, ok := input.tryClaim()
	31	+	if !ok {
	32	+	return terminalCapabilities{}
	33	+	}
	34	+	defer input.revoke(consumer)
	35	+
	36	+	query := terminalquery.KittyGraphicsQuery + terminalquery.KittyKeyboardQuery + terminalquery.DeviceAttributesQuery
	37	+	if _, err := terminal.Out().Write([]byte(query)); err != nil {
	38	+	return terminalCapabilities{}
	39	+	}
	40	+	if err := terminal.Flush(); err != nil {
	41	+	return terminalCapabilities{}
	42	+	}
	43	+
	44	+	probe := &terminalquery.Probe{}
	45	+	var replay []byte
	46	+	timer := clock.NewTimer(terminalCapabilityProbeTimeout)
	47	+	defer timer.Stop()
	48	+	// DA1 is the FIFO sentinel: once it arrives, the answers to the earlier
	49	+	// queries are definitive.
	50	+	wait:
	51	+	for !probe.DA1() {
	52	+	select {
	53	+	case <-ctx.Done():
	54	+	break wait
	55	+	case <-timer.C():
	56	+	break wait
	57	+	case <-input.readyFor(consumer):
	58	+	result, ok := input.take(ctx, consumer)
	59	+	if !ok {
	60	+	if ctx.Err() != nil {
	61	+	break wait
	62	+	}
	63	+	continue
	64	+	}
	65	+	replay = append(replay, probe.Feed(result.data)...)
	66	+	input.ack(consumer)
	67	+	if result.err != nil {
	68	+	break wait
	69	+	}
	70	+	}
	71	+	}
	72	+	replay = append(replay, probe.Finish()...)
	73	+	// Preserve before revoke so the next consumer reads these bytes before any
	74	+	// later terminal read.
	75	+	input.preserveResidual(consumer, replay)
	76	+	if !probe.DA1() {
	77	+	return terminalCapabilities{}
	78	+	}
	79	+	return terminalCapabilities{KittyGraphics: probe.KittyGraphics(), KittyKeyboard: probe.KittyKeyboard()}
	80	+	}

@@ -0,0 +1,80 @@
	1	+	package client
	2	+
	3	+	import (
	4	+	"context"
	5	+	"time"
	6	+
	7	+	"github.com/bnema/vev-vt/protocol/terminalquery"
	8	+
	9	+	"github.com/bnema/vev/internal/ports"
	10	+	)
	11	+
	12	+	// terminalCapabilityProbeTimeout bounds the outer-terminal capability probe.
	13	+	// DA1 answers first on any terminal, so a real terminal finishes far sooner.
	14	+	const terminalCapabilityProbeTimeout = 150 * time.Millisecond
	15	+
	16	+	// terminalCapabilities is what the outer terminal declared to the probe.
	17	+	type terminalCapabilities struct {
	18	+	KittyGraphics bool
	19	+	KittyKeyboard bool
	20	+	}
	21	+
	22	+	// probeTerminalCapabilities performs one bounded probe of the outer terminal
	23	+	// through the lifecycle's only input pump. It must run before any other
	24	+	// consumer claims input. Probe responses are removed; every unrelated byte is
	25	+	// kept, in order, for the next consumer.
	26	+	func probeTerminalCapabilities(ctx context.Context, terminal ports.Terminal, clock ports.Clock, input *terminalInputPump) terminalCapabilities {
	27	+	if input == nil \|\| supervisorNil(terminal) \|\| supervisorNil(clock) {
	28	+	return terminalCapabilities{}
	29	+	}
	30	+	consumer, ok := input.tryClaim()
	31	+	if !ok {
	32	+	return terminalCapabilities{}
	33	+	}
	34	+	defer input.revoke(consumer)
	35	+
	36	+	query := terminalquery.KittyGraphicsQuery + terminalquery.KittyKeyboardQuery + terminalquery.DeviceAttributesQuery
	37	+	if _, err := terminal.Out().Write([]byte(query)); err != nil {
	38	+	return terminalCapabilities{}
	39	+	}
	40	+	if err := terminal.Flush(); err != nil {
	41	+	return terminalCapabilities{}
	42	+	}
	43	+
	44	+	probe := &terminalquery.Probe{}
	45	+	var replay []byte
	46	+	timer := clock.NewTimer(terminalCapabilityProbeTimeout)
	47	+	defer timer.Stop()
	48	+	// DA1 is the FIFO sentinel: once it arrives, the answers to the earlier
	49	+	// queries are definitive.
	50	+	wait:
	51	+	for !probe.DA1() {
	52	+	select {
	53	+	case <-ctx.Done():
	54	+	break wait
	55	+	case <-timer.C():
	56	+	break wait
	57	+	case <-input.readyFor(consumer):
	58	+	result, ok := input.take(ctx, consumer)
	59	+	if !ok {
	60	+	if ctx.Err() != nil {
	61	+	break wait
	62	+	}
	63	+	continue
	64	+	}
	65	+	replay = append(replay, probe.Feed(result.data)...)
	66	+	input.ack(consumer)
	67	+	if result.err != nil {
	68	+	break wait
	69	+	}
	70	+	}
	71	+	}
	72	+	replay = append(replay, probe.Finish()...)
	73	+	// Preserve before revoke so the next consumer reads these bytes before any
	74	+	// later terminal read.
	75	+	input.preserveResidual(consumer, replay)
	76	+	if !probe.DA1() {
	77	+	return terminalCapabilities{}
	78	+	}
	79	+	return terminalCapabilities{KittyGraphics: probe.KittyGraphics(), KittyKeyboard: probe.KittyKeyboard()}
	80	+	}

A internal/usecase/client/terminal_probe_test.go +98 -0

@@ -0,0 +1,98 @@
	1	+	package client
	2	+
	3	+	import (
	4	+	"bytes"
	5	+	"context"
	6	+	"io"
	7	+	"testing"
	8	+	"time"
	9	+
	10	+	"github.com/bnema/vev-vt/protocol/terminalquery"
	11	+	"github.com/stretchr/testify/require"
	12	+
	13	+	portsmocks "github.com/bnema/vev/internal/ports/mocks"
	14	+	)
	15	+
	16	+	func TestProbeTerminalCapabilities(t *testing.T) {
	17	+	const query = terminalquery.KittyGraphicsQuery + terminalquery.KittyKeyboardQuery + terminalquery.DeviceAttributesQuery
	18	+	tests := []struct {
	19	+	name string
	20	+	reply string
	21	+	timeout bool
	22	+	want terminalCapabilities
	23	+	wantRest string
	24	+	}{
	25	+	{name: "graphics and keyboard", reply: "\x1b_Gi=31;OK\x1b\\\x1b[?0u\x1b[?62;c", want: terminalCapabilities{KittyGraphics: true, KittyKeyboard: true}},
	26	+	{name: "keyboard only", reply: "\x1b[?0u\x1b[?62;22c", want: terminalCapabilities{KittyKeyboard: true}},
	27	+	{name: "neither", reply: "\x1b[?62;22c"},
	28	+	{name: "typed input is kept in order", reply: "ab\x1b[?1u\x1b[?62;22ccd", want: terminalCapabilities{KittyKeyboard: true}, wantRest: "abcd"},
	29	+	{name: "no DA1 means nothing", reply: "\x1b[?0u", timeout: true, wantRest: ""},
	30	+	{name: "silent terminal times out", timeout: true},
	31	+	}
	32	+	for _, tt := range tests {
	33	+	t.Run(tt.name, func(t *testing.T) {
	34	+	inR, inW := io.Pipe()
	35	+	defer func() { _ = inW.Close() }()
	36	+	pump := newTerminalInputPump(inR)
	37	+	pump.start()
	38	+	defer pump.stop()
	39	+
	40	+	var out bytes.Buffer
	41	+	term := portsmocks.NewMockTerminal(t)
	42	+	term.EXPECT().Out().Return(&out).Once()
	43	+	written := make(chan struct{})
	44	+	term.EXPECT().Flush().RunAndReturn(func() error {
	45	+	go func() {
	46	+	defer close(written)
	47	+	if tt.reply != "" {
	48	+	_, _ = inW.Write([]byte(tt.reply))
	49	+	}
	50	+	}()
	51	+	return nil
	52	+	}).Once()
	53	+	clk := &pcFakeClock{}
	54	+
	55	+	got := make(chan terminalCapabilities, 1)
	56	+	go func() { got <- probeTerminalCapabilities(context.Background(), term, clk, pump) }()
	57	+	if tt.timeout {
	58	+	require.Eventually(t, func() bool {
	59	+	clk.mu.Lock()
	60	+	defer clk.mu.Unlock()
	61	+	return len(clk.timers) == 1
	62	+	}, timeoutForTest, pollForTest)
	63	+	// A pipe write returns once the pump read it, so a partial
	64	+	// reply is in before the deadline fires.
	65	+	<-written
	66	+	require.Eventually(t, func() bool { return pumpDrained(pump) }, timeoutForTest, pollForTest)
	67	+	clk.fireLast()
	68	+	}
	69	+	caps := <-got
	70	+	require.Equal(t, query, out.String())
	71	+	require.Equal(t, tt.want, caps)
	72	+
	73	+	consumer, ok := pump.tryClaim()
	74	+	require.True(t, ok)
	75	+	defer pump.revoke(consumer)
	76	+	if tt.wantRest == "" {
	77	+	_, ok := pump.take(context.Background(), consumer)
	78	+	require.False(t, ok, "no byte may be left for the next consumer")
	79	+	return
	80	+	}
	81	+	result, ok := pump.take(context.Background(), consumer)
	82	+	require.True(t, ok)
	83	+	require.Equal(t, tt.wantRest, string(result.data))
	84	+	})
	85	+	}
	86	+	}
	87	+
	88	+	const (
	89	+	timeoutForTest = 2 * time.Second
	90	+	pollForTest = time.Millisecond
	91	+	)
	92	+
	93	+	// pumpDrained reports that the probe consumed every read the pump delivered.
	94	+	func pumpDrained(p *terminalInputPump) bool {
	95	+	p.mu.Lock()
	96	+	defer p.mu.Unlock()
	97	+	return p.pending == nil && p.delivering == 0
	98	+	}

@@ -0,0 +1,98 @@
	1	+	package client
	2	+
	3	+	import (
	4	+	"bytes"
	5	+	"context"
	6	+	"io"
	7	+	"testing"
	8	+	"time"
	9	+
	10	+	"github.com/bnema/vev-vt/protocol/terminalquery"
	11	+	"github.com/stretchr/testify/require"
	12	+
	13	+	portsmocks "github.com/bnema/vev/internal/ports/mocks"
	14	+	)
	15	+
	16	+	func TestProbeTerminalCapabilities(t *testing.T) {
	17	+	const query = terminalquery.KittyGraphicsQuery + terminalquery.KittyKeyboardQuery + terminalquery.DeviceAttributesQuery
	18	+	tests := []struct {
	19	+	name string
	20	+	reply string
	21	+	timeout bool
	22	+	want terminalCapabilities
	23	+	wantRest string
	24	+	}{
	25	+	{name: "graphics and keyboard", reply: "\x1b_Gi=31;OK\x1b\\\x1b[?0u\x1b[?62;c", want: terminalCapabilities{KittyGraphics: true, KittyKeyboard: true}},
	26	+	{name: "keyboard only", reply: "\x1b[?0u\x1b[?62;22c", want: terminalCapabilities{KittyKeyboard: true}},
	27	+	{name: "neither", reply: "\x1b[?62;22c"},
	28	+	{name: "typed input is kept in order", reply: "ab\x1b[?1u\x1b[?62;22ccd", want: terminalCapabilities{KittyKeyboard: true}, wantRest: "abcd"},
	29	+	{name: "no DA1 means nothing", reply: "\x1b[?0u", timeout: true, wantRest: ""},
	30	+	{name: "silent terminal times out", timeout: true},
	31	+	}
	32	+	for _, tt := range tests {
	33	+	t.Run(tt.name, func(t *testing.T) {
	34	+	inR, inW := io.Pipe()
	35	+	defer func() { _ = inW.Close() }()
	36	+	pump := newTerminalInputPump(inR)
	37	+	pump.start()
	38	+	defer pump.stop()
	39	+
	40	+	var out bytes.Buffer
	41	+	term := portsmocks.NewMockTerminal(t)
	42	+	term.EXPECT().Out().Return(&out).Once()
	43	+	written := make(chan struct{})
	44	+	term.EXPECT().Flush().RunAndReturn(func() error {
	45	+	go func() {
	46	+	defer close(written)
	47	+	if tt.reply != "" {
	48	+	_, _ = inW.Write([]byte(tt.reply))
	49	+	}
	50	+	}()
	51	+	return nil
	52	+	}).Once()
	53	+	clk := &pcFakeClock{}
	54	+
	55	+	got := make(chan terminalCapabilities, 1)
	56	+	go func() { got <- probeTerminalCapabilities(context.Background(), term, clk, pump) }()
	57	+	if tt.timeout {
	58	+	require.Eventually(t, func() bool {
	59	+	clk.mu.Lock()
	60	+	defer clk.mu.Unlock()
	61	+	return len(clk.timers) == 1
	62	+	}, timeoutForTest, pollForTest)
	63	+	// A pipe write returns once the pump read it, so a partial
	64	+	// reply is in before the deadline fires.
	65	+	<-written
	66	+	require.Eventually(t, func() bool { return pumpDrained(pump) }, timeoutForTest, pollForTest)
	67	+	clk.fireLast()
	68	+	}
	69	+	caps := <-got
	70	+	require.Equal(t, query, out.String())
	71	+	require.Equal(t, tt.want, caps)
	72	+
	73	+	consumer, ok := pump.tryClaim()
	74	+	require.True(t, ok)
	75	+	defer pump.revoke(consumer)
	76	+	if tt.wantRest == "" {
	77	+	_, ok := pump.take(context.Background(), consumer)
	78	+	require.False(t, ok, "no byte may be left for the next consumer")
	79	+	return
	80	+	}
	81	+	result, ok := pump.take(context.Background(), consumer)
	82	+	require.True(t, ok)
	83	+	require.Equal(t, tt.wantRest, string(result.data))
	84	+	})
	85	+	}
	86	+	}
	87	+
	88	+	const (
	89	+	timeoutForTest = 2 * time.Second
	90	+	pollForTest = time.Millisecond
	91	+	)
	92	+
	93	+	// pumpDrained reports that the probe consumed every read the pump delivered.
	94	+	func pumpDrained(p *terminalInputPump) bool {
	95	+	p.mu.Lock()
	96	+	defer p.mu.Unlock()
	97	+	return p.pending == nil && p.delivering == 0
	98	+	}

M internal/usecase/daemon/attachment_output.go +4 -0


@@ -49,6 +49,10 @@ func (d Daemon) reconfigureAttachmentOutput(sess session, ac *attachedClient,
49	49		return
50	50		}
51	51		ac.terminalCapabilities.KittyGraphics = h.KittyDirectGraphics
	52	+	// A replacement terminal declares its own keyboard protocol.
	53	+	if ac.keys != nil {
	54	+	ac.keys.SetKittyKeyboard(h.KittyKeyboard)
	55	+	}
52	56		ac.output.graphicsUnsupportedWarned.Store(false)
53	57		// A replacement connection is a different outer terminal. Retire the old
54	58		// attachment-local state without writing cleanup to the new terminal, then


@@ -49,6 +49,10 @@ func (d Daemon) reconfigureAttachmentOutput(sess session, ac *attachedClient,
49	return	49		return
50	}	50		}
51	ac.terminalCapabilities.KittyGraphics = h.KittyDirectGraphics	51		ac.terminalCapabilities.KittyGraphics = h.KittyDirectGraphics
		52	+	// A replacement terminal declares its own keyboard protocol.
		53	+	if ac.keys != nil {
		54	+	ac.keys.SetKittyKeyboard(h.KittyKeyboard)
		55	+	}
52	ac.output.graphicsUnsupportedWarned.Store(false)	56		ac.output.graphicsUnsupportedWarned.Store(false)
53	// A replacement connection is a different outer terminal. Retire the old	57		// A replacement connection is a different outer terminal. Retire the old
54	// attachment-local state without writing cleanup to the new terminal, then	58		// attachment-local state without writing cleanup to the new terminal, then

M internal/usecase/daemon/client.go +2 -0


@@ -630,6 +630,7 @@ func (d *Daemon) notifiesSnapshot() []chan struct{} {
630	630
631	631		type attachClientOptions struct {
632	632		clientID [16]byte
	633	+	kittyKeyboard bool
633	634		resumeCapable bool
634	635		maxOutputInFlight uint8
635	636		terminalCapabilities terminalcap.Capabilities

@@ -719,6 +720,7 @@ func (d Daemon) prepareAttachedClientLocked(sess session, tr ports.ServerConne
719	720		output.attachment = ac
720	721		ac.initOverlays()
721	722		ac.keys = keys.NewRouter(d.clock, daemonKeyHandler{d: d, ac: ac}, &d.bindings)
	723	+	ac.keys.SetKittyKeyboard(opts.kittyKeyboard)
722	724		return ac
723	725		}
724	726


@@ -630,6 +630,7 @@ func (d *Daemon) notifiesSnapshot() []chan struct{} {
630		630
631	type attachClientOptions struct {	631		type attachClientOptions struct {
632	clientID [16]byte	632		clientID [16]byte
		633	+	kittyKeyboard bool
633	resumeCapable bool	634		resumeCapable bool
634	maxOutputInFlight uint8	635		maxOutputInFlight uint8
635	terminalCapabilities terminalcap.Capabilities	636		terminalCapabilities terminalcap.Capabilities

@@ -719,6 +720,7 @@ func (d Daemon) prepareAttachedClientLocked(sess session, tr ports.ServerConne
719	output.attachment = ac	720		output.attachment = ac
720	ac.initOverlays()	721		ac.initOverlays()
721	ac.keys = keys.NewRouter(d.clock, daemonKeyHandler{d: d, ac: ac}, &d.bindings)	722		ac.keys = keys.NewRouter(d.clock, daemonKeyHandler{d: d, ac: ac}, &d.bindings)
		723	+	ac.keys.SetKittyKeyboard(opts.kittyKeyboard)
722	return ac	724		return ac
723	}	725		}
724		726

M internal/usecase/daemon/daemon.go +1 -0


@@ -1502,6 +1502,7 @@ func (d Daemon) finishAttach(sess session, tr ports.ServerConnection, sz domai
1502	1502		}
1503	1503		opts := attachClientOptions{
1504	1504		clientID: h.ClientID,
	1505	+	kittyKeyboard: h.KittyKeyboard,
1505	1506		resumeCapable: true,
1506	1507		maxOutputInFlight: normalizeOutputWindow(h.MaxOutputInFlight),
1507	1508		navigationCapabilities: h.NavigationCapabilities,


@@ -1502,6 +1502,7 @@ func (d Daemon) finishAttach(sess session, tr ports.ServerConnection, sz domai
1502	}	1502		}
1503	opts := attachClientOptions{	1503		opts := attachClientOptions{
1504	clientID: h.ClientID,	1504		clientID: h.ClientID,
		1505	+	kittyKeyboard: h.KittyKeyboard,
1505	resumeCapable: true,	1506		resumeCapable: true,
1506	maxOutputInFlight: normalizeOutputWindow(h.MaxOutputInFlight),	1507		maxOutputInFlight: normalizeOutputWindow(h.MaxOutputInFlight),
1507	navigationCapabilities: h.NavigationCapabilities,	1508		navigationCapabilities: h.NavigationCapabilities,

M internal/usecase/daemon/input.go +42 -2


@@ -7,7 +7,9 @@ import (
7	7		"strconv"
8	8
9	9		"github.com/bnema/vev/internal/domain"
	10	+	"github.com/bnema/vev/internal/usecase/command"
10	11		"github.com/bnema/vev/internal/usecase/keys"
	12	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
11	13		"github.com/bnema/vev/internal/usecase/layout"
12	14		"github.com/bnema/vev/internal/usecase/mouse"
13	15		)

@@ -38,7 +40,7 @@ func (d Daemon) handleInput(_ session, ac *attachedClient, data []byte) {
38	40		ac.mouseScan.Scan(data,
39	41		func(ev mouse.Event) { d.handleMouse(ac, ev) },
40	42		func(b []byte) {
41		-	if ac.overlays.HandleInput(d, b) {
	43	+	if ac.overlays.HandleInput(d, ac.legacyKeys(b)) {
42	44		return
43	45		}
44	46		ac.keys.Route(b)

@@ -64,7 +66,9 @@ func (d Daemon) handleInputForAttachment(effect attachmentEffect, data []byte)
64	66		if !effect.current() {
65	67		return
66	68		}
67		-	if ac.overlays.HandleInput(d, b, effect) {
	69	+	// Overlays parse legacy key bytes; only the router and panes see
	70	+	// kitty keyboard sequences.
	71	+	if ac.overlays.HandleInput(d, ac.legacyKeys(b), effect) {
68	72		return
69	73		}
70	74		if !effect.current() {

@@ -436,11 +440,39 @@ func (h daemonKeyHandler) Forward(data []byte) {
436	440		tb.mu.Lock()
437	441		p := tb.terminalTargetLocked()
438	442		tb.mu.Unlock()
	443	+	if h.ac.keys.KittyKeyboard() {
	444	+	data = paneKeyInput(p, data)
	445	+	}
439	446		h.d.writeToPane(sess, p, data)
440	447		return nil
441	448		})
442	449		}
443	450
	451	+	// paneKeyInput re-encodes kitty keyboard protocol key events for the pane's
	452	+	// program: legacy bytes unless it requested the protocol itself.
	453	+	func paneKeyInput(p *pane, data []byte) []byte {
	454	+	if p == nil {
	455	+	return data
	456	+	}
	457	+	p.mu.Lock()
	458	+	if p.screen == nil {
	459	+	p.mu.Unlock()
	460	+	return data
	461	+	}
	462	+	flags := p.screen.KittyKeyboardFlags()
	463	+	p.mu.Unlock()
	464	+	return kittykey.Translate(data, flags)
	465	+	}
	466	+
	467	+	// legacyKeys returns input as legacy key bytes for daemon overlays. Only an
	468	+	// attachment that enabled the kitty keyboard protocol needs translating.
	469	+	func (ac *attachedClient) legacyKeys(data []byte) []byte {
	470	+	if !ac.keys.KittyKeyboard() {
	471	+	return data
	472	+	}
	473	+	return kittykey.Translate(data, 0)
	474	+	}
	475	+
444	476		func (h daemonKeyHandler) Action(action keys.Action, _ []byte) {
445	477		sess, effect, owned := h.acquireAttachmentEffect()
446	478		if sess == nil {

@@ -515,6 +547,14 @@ func (h daemonKeyHandler) Action(action keys.Action, _ []byte) {
515	547		runAction(daemonActionRequest{kind: daemonActionConsumeOrExpelPane, direction: layout.Left})
516	548		case keys.ActionConsumeOrExpelPaneRight:
517	549		runAction(daemonActionRequest{kind: daemonActionConsumeOrExpelPane, direction: layout.Right})
	550	+	case keys.ActionSwitchRecent1, keys.ActionSwitchRecent2, keys.ActionSwitchRecent3,
	551	+	keys.ActionSwitchRecent4, keys.ActionSwitchRecent5, keys.ActionSwitchRecent6,
	552	+	keys.ActionSwitchRecent7, keys.ActionSwitchRecent8, keys.ActionSwitchRecent9:
	553	+	rank := int(action-keys.ActionSwitchRecent1) + 1
	554	+	exec := paletteExec{d: h.d, sess: sess, attachment: sess, ac: h.ac, routeSnapshot: h.ac.routeSnapshotCopy(), effect: effect}
	555	+	if err := exec.JumpRecentSession(rank); err != nil && !errors.Is(err, errAttachmentTransition) && !errors.Is(err, command.ErrInvalidArguments) {
	556	+	h.d.reportError(sess, err)
	557	+	}
518	558		case keys.ActionSwitchTab1, keys.ActionSwitchTab2, keys.ActionSwitchTab3,
519	559		keys.ActionSwitchTab4, keys.ActionSwitchTab5, keys.ActionSwitchTab6,
520	560		keys.ActionSwitchTab7, keys.ActionSwitchTab8, keys.ActionSwitchTab9:


@@ -7,7 +7,9 @@ import (
7		"strconv"	7		"strconv"
8			8
9		"github.com/bnema/vev/internal/domain"	9		"github.com/bnema/vev/internal/domain"
			10	+	"github.com/bnema/vev/internal/usecase/command"
10		"github.com/bnema/vev/internal/usecase/keys"	11		"github.com/bnema/vev/internal/usecase/keys"
			12	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
11		"github.com/bnema/vev/internal/usecase/layout"	13		"github.com/bnema/vev/internal/usecase/layout"
12		"github.com/bnema/vev/internal/usecase/mouse"	14		"github.com/bnema/vev/internal/usecase/mouse"
13		)	15		)

@@ -38,7 +40,7 @@ func (d Daemon) handleInput(_ session, ac *attachedClient, data []byte) {
38		ac.mouseScan.Scan(data,	40		ac.mouseScan.Scan(data,
39		func(ev mouse.Event) { d.handleMouse(ac, ev) },	41		func(ev mouse.Event) { d.handleMouse(ac, ev) },
40		func(b []byte) {	42		func(b []byte) {
41	-	if ac.overlays.HandleInput(d, b) {	43	+	if ac.overlays.HandleInput(d, ac.legacyKeys(b)) {
42		return	44		return
43		}	45		}
44		ac.keys.Route(b)	46		ac.keys.Route(b)

@@ -64,7 +66,9 @@ func (d Daemon) handleInputForAttachment(effect attachmentEffect, data []byte)
64		if !effect.current() {	66		if !effect.current() {
65		return	67		return
66		}	68		}
67	-	if ac.overlays.HandleInput(d, b, effect) {	69	+	// Overlays parse legacy key bytes; only the router and panes see
			70	+	// kitty keyboard sequences.
			71	+	if ac.overlays.HandleInput(d, ac.legacyKeys(b), effect) {
68		return	72		return
69		}	73		}
70		if !effect.current() {	74		if !effect.current() {

@@ -436,11 +440,39 @@ func (h daemonKeyHandler) Forward(data []byte) {
436		tb.mu.Lock()	440		tb.mu.Lock()
437		p := tb.terminalTargetLocked()	441		p := tb.terminalTargetLocked()
438		tb.mu.Unlock()	442		tb.mu.Unlock()
			443	+	if h.ac.keys.KittyKeyboard() {
			444	+	data = paneKeyInput(p, data)
			445	+	}
439		h.d.writeToPane(sess, p, data)	446		h.d.writeToPane(sess, p, data)
440		return nil	447		return nil
441		})	448		})
442		}	449		}
443			450
			451	+	// paneKeyInput re-encodes kitty keyboard protocol key events for the pane's
			452	+	// program: legacy bytes unless it requested the protocol itself.
			453	+	func paneKeyInput(p *pane, data []byte) []byte {
			454	+	if p == nil {
			455	+	return data
			456	+	}
			457	+	p.mu.Lock()
			458	+	if p.screen == nil {
			459	+	p.mu.Unlock()
			460	+	return data
			461	+	}
			462	+	flags := p.screen.KittyKeyboardFlags()
			463	+	p.mu.Unlock()
			464	+	return kittykey.Translate(data, flags)
			465	+	}
			466	+
			467	+	// legacyKeys returns input as legacy key bytes for daemon overlays. Only an
			468	+	// attachment that enabled the kitty keyboard protocol needs translating.
			469	+	func (ac *attachedClient) legacyKeys(data []byte) []byte {
			470	+	if !ac.keys.KittyKeyboard() {
			471	+	return data
			472	+	}
			473	+	return kittykey.Translate(data, 0)
			474	+	}
			475	+
444		func (h daemonKeyHandler) Action(action keys.Action, _ []byte) {	476		func (h daemonKeyHandler) Action(action keys.Action, _ []byte) {
445		sess, effect, owned := h.acquireAttachmentEffect()	477		sess, effect, owned := h.acquireAttachmentEffect()
446		if sess == nil {	478		if sess == nil {

@@ -515,6 +547,14 @@ func (h daemonKeyHandler) Action(action keys.Action, _ []byte) {
515		runAction(daemonActionRequest{kind: daemonActionConsumeOrExpelPane, direction: layout.Left})	547		runAction(daemonActionRequest{kind: daemonActionConsumeOrExpelPane, direction: layout.Left})
516		case keys.ActionConsumeOrExpelPaneRight:	548		case keys.ActionConsumeOrExpelPaneRight:
517		runAction(daemonActionRequest{kind: daemonActionConsumeOrExpelPane, direction: layout.Right})	549		runAction(daemonActionRequest{kind: daemonActionConsumeOrExpelPane, direction: layout.Right})
			550	+	case keys.ActionSwitchRecent1, keys.ActionSwitchRecent2, keys.ActionSwitchRecent3,
			551	+	keys.ActionSwitchRecent4, keys.ActionSwitchRecent5, keys.ActionSwitchRecent6,
			552	+	keys.ActionSwitchRecent7, keys.ActionSwitchRecent8, keys.ActionSwitchRecent9:
			553	+	rank := int(action-keys.ActionSwitchRecent1) + 1
			554	+	exec := paletteExec{d: h.d, sess: sess, attachment: sess, ac: h.ac, routeSnapshot: h.ac.routeSnapshotCopy(), effect: effect}
			555	+	if err := exec.JumpRecentSession(rank); err != nil && !errors.Is(err, errAttachmentTransition) && !errors.Is(err, command.ErrInvalidArguments) {
			556	+	h.d.reportError(sess, err)
			557	+	}
518		case keys.ActionSwitchTab1, keys.ActionSwitchTab2, keys.ActionSwitchTab3,	558		case keys.ActionSwitchTab1, keys.ActionSwitchTab2, keys.ActionSwitchTab3,
519		keys.ActionSwitchTab4, keys.ActionSwitchTab5, keys.ActionSwitchTab6,	559		keys.ActionSwitchTab4, keys.ActionSwitchTab5, keys.ActionSwitchTab6,
520		keys.ActionSwitchTab7, keys.ActionSwitchTab8, keys.ActionSwitchTab9:	560		keys.ActionSwitchTab7, keys.ActionSwitchTab8, keys.ActionSwitchTab9:

A internal/usecase/daemon/input_kitty_test.go +34 -0

@@ -0,0 +1,34 @@
	1	+	package daemon
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	vt "github.com/bnema/vev-vt"
	7	+	"github.com/stretchr/testify/require"
	8	+	)
	9	+
	10	+	func TestPaneKeyInputFollowsPaneKeyboardFlags(t *testing.T) {
	11	+	tests := []struct {
	12	+	name string
	13	+	screen string
	14	+	in string
	15	+	want string
	16	+	}{
	17	+	{name: "legacy pane gets control byte", in: "\x1b[97;5u", want: "\x01"},
	18	+	{name: "legacy pane text untouched", in: "hello", want: "hello"},
	19	+	{name: "kitty pane keeps sequence", screen: "\x1b[>1u", in: "\x1b[97;5u", want: "\x1b[97;5u"},
	20	+	{name: "kitty pane without alternates strips them", screen: "\x1b[>1u", in: "\x1b[38::49;5u", want: "\x1b[38;5u"},
	21	+	{name: "popped pane is legacy again", screen: "\x1b[>1u\x1b[<u", in: "\x1b[27u", want: "\x1b"},
	22	+	{name: "nil pane passthrough", in: "\x1b[97;5u", want: "\x1b[97;5u"},
	23	+	}
	24	+	for _, tt := range tests {
	25	+	t.Run(tt.name, func(t *testing.T) {
	26	+	var p *pane
	27	+	if tt.name != "nil pane passthrough" {
	28	+	p = &pane{screen: vt.NewScreen(10, 3)}
	29	+	p.screen.Write([]byte(tt.screen))
	30	+	}
	31	+	require.Equal(t, []byte(tt.want), paneKeyInput(p, []byte(tt.in)))
	32	+	})
	33	+	}
	34	+	}

@@ -0,0 +1,34 @@
	1	+	package daemon
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	vt "github.com/bnema/vev-vt"
	7	+	"github.com/stretchr/testify/require"
	8	+	)
	9	+
	10	+	func TestPaneKeyInputFollowsPaneKeyboardFlags(t *testing.T) {
	11	+	tests := []struct {
	12	+	name string
	13	+	screen string
	14	+	in string
	15	+	want string
	16	+	}{
	17	+	{name: "legacy pane gets control byte", in: "\x1b[97;5u", want: "\x01"},
	18	+	{name: "legacy pane text untouched", in: "hello", want: "hello"},
	19	+	{name: "kitty pane keeps sequence", screen: "\x1b[>1u", in: "\x1b[97;5u", want: "\x1b[97;5u"},
	20	+	{name: "kitty pane without alternates strips them", screen: "\x1b[>1u", in: "\x1b[38::49;5u", want: "\x1b[38;5u"},
	21	+	{name: "popped pane is legacy again", screen: "\x1b[>1u\x1b[<u", in: "\x1b[27u", want: "\x1b"},
	22	+	{name: "nil pane passthrough", in: "\x1b[97;5u", want: "\x1b[97;5u"},
	23	+	}
	24	+	for _, tt := range tests {
	25	+	t.Run(tt.name, func(t *testing.T) {
	26	+	var p *pane
	27	+	if tt.name != "nil pane passthrough" {
	28	+	p = &pane{screen: vt.NewScreen(10, 3)}
	29	+	p.screen.Write([]byte(tt.screen))
	30	+	}
	31	+	require.Equal(t, []byte(tt.want), paneKeyInput(p, []byte(tt.in)))
	32	+	})
	33	+	}
	34	+	}

M internal/usecase/daemon/recent_route_snapshot_test.go +54 -0


@@ -179,3 +179,57 @@ func TestStatusHistoryShowsVisitedAndRingingRoutes(t *testing.T) {
179	179		})
180	180		}
181	181		}
	182	+
	183	+	func TestCtrlDigitSwitchesToRecentHistoryRank(t *testing.T) {
	184	+	snapshot := protocol.RecentRouteSnapshot{
	185	+	Generation: 4,
	186	+	Entries: []protocol.RecentRouteEntry{
	187	+	testRouteEntry(2, 3, "first", 2, protocol.RouteKindLocal),
	188	+	testRouteEntry(7, 1, "second", 7, protocol.RouteKindRemote),
	189	+	},
	190	+	}
	191	+	tests := []struct {
	192	+	name string
	193	+	input string
	194	+	wantKey uint64
	195	+	wantGen uint64
	196	+	none bool
	197	+	legacy bool
	198	+	}{
	199	+	{name: "ctrl 1 previous session", input: "\x1b[49;5u", wantKey: 2, wantGen: 3},
	200	+	{name: "ctrl 2 second previous", input: "\x1b[50;5u", wantKey: 7, wantGen: 1},
	201	+	{name: "azerty ctrl 2 base key", input: "\x1b[233::50;5u", wantKey: 7, wantGen: 1},
	202	+	{name: "ctrl 3 beyond history is a no-op", input: "\x1b[51;5u", none: true},
	203	+	{name: "legacy client does not intercept", input: "\x1b[49;5u", none: true, legacy: true},
	204	+	}
	205	+	for _, tt := range tests {
	206	+	t.Run(tt.name, func(t *testing.T) {
	207	+	d, source, ac, _ := newManualSessionWithPTYs(t, nil)
	208	+	transport := &closeTrackingTransport{}
	209	+	ac.replaceTransport(transport)
	210	+	rc := d.attachCoordinator(source, nil, ac, true)
	211	+	token := source.captureAttachmentCapability(ac, transport)
	212	+	token.lease = rc.attachmentLease(ac)
	213	+	ac.installTestAttachmentCapability(token)
	214	+	ac.setRouteSnapshot(snapshot)
	215	+	ac.keys.SetKittyKeyboard(!tt.legacy)
	216	+	effect, admitted := ac.beginAttachmentEffect(token)
	217	+	require.True(t, admitted)
	218	+	defer effect.End()
	219	+
	220	+	d.handleInputForAttachment(effect, []byte(tt.input))
	221	+
	222	+	var actions []protocol.RouteNavigationAction
	223	+	for _, frame := range transport.Sends() {
	224	+	if decoded, ok := decodeServerMessage(t, frame).(protocol.RouteNavigationAction); ok {
	225	+	actions = append(actions, decoded)
	226	+	}
	227	+	}
	228	+	if tt.none {
	229	+	require.Empty(t, actions)
	230	+	return
	231	+	}
	232	+	require.Equal(t, []protocol.RouteNavigationAction{{SnapshotGeneration: 4, Key: tt.wantKey, Generation: tt.wantGen}}, actions)
	233	+	})
	234	+	}
	235	+	}


@@ -179,3 +179,57 @@ func TestStatusHistoryShowsVisitedAndRingingRoutes(t *testing.T) {
179	})	179		})
180	}	180		}
181	}	181		}
		182	+
		183	+	func TestCtrlDigitSwitchesToRecentHistoryRank(t *testing.T) {
		184	+	snapshot := protocol.RecentRouteSnapshot{
		185	+	Generation: 4,
		186	+	Entries: []protocol.RecentRouteEntry{
		187	+	testRouteEntry(2, 3, "first", 2, protocol.RouteKindLocal),
		188	+	testRouteEntry(7, 1, "second", 7, protocol.RouteKindRemote),
		189	+	},
		190	+	}
		191	+	tests := []struct {
		192	+	name string
		193	+	input string
		194	+	wantKey uint64
		195	+	wantGen uint64
		196	+	none bool
		197	+	legacy bool
		198	+	}{
		199	+	{name: "ctrl 1 previous session", input: "\x1b[49;5u", wantKey: 2, wantGen: 3},
		200	+	{name: "ctrl 2 second previous", input: "\x1b[50;5u", wantKey: 7, wantGen: 1},
		201	+	{name: "azerty ctrl 2 base key", input: "\x1b[233::50;5u", wantKey: 7, wantGen: 1},
		202	+	{name: "ctrl 3 beyond history is a no-op", input: "\x1b[51;5u", none: true},
		203	+	{name: "legacy client does not intercept", input: "\x1b[49;5u", none: true, legacy: true},
		204	+	}
		205	+	for _, tt := range tests {
		206	+	t.Run(tt.name, func(t *testing.T) {
		207	+	d, source, ac, _ := newManualSessionWithPTYs(t, nil)
		208	+	transport := &closeTrackingTransport{}
		209	+	ac.replaceTransport(transport)
		210	+	rc := d.attachCoordinator(source, nil, ac, true)
		211	+	token := source.captureAttachmentCapability(ac, transport)
		212	+	token.lease = rc.attachmentLease(ac)
		213	+	ac.installTestAttachmentCapability(token)
		214	+	ac.setRouteSnapshot(snapshot)
		215	+	ac.keys.SetKittyKeyboard(!tt.legacy)
		216	+	effect, admitted := ac.beginAttachmentEffect(token)
		217	+	require.True(t, admitted)
		218	+	defer effect.End()
		219	+
		220	+	d.handleInputForAttachment(effect, []byte(tt.input))
		221	+
		222	+	var actions []protocol.RouteNavigationAction
		223	+	for _, frame := range transport.Sends() {
		224	+	if decoded, ok := decodeServerMessage(t, frame).(protocol.RouteNavigationAction); ok {
		225	+	actions = append(actions, decoded)
		226	+	}
		227	+	}
		228	+	if tt.none {
		229	+	require.Empty(t, actions)
		230	+	return
		231	+	}
		232	+	require.Equal(t, []protocol.RouteNavigationAction{{SnapshotGeneration: 4, Key: tt.wantKey, Generation: tt.wantGen}}, actions)
		233	+	})
		234	+	}
		235	+	}

M internal/usecase/keys/bindings.go +2 -11

@@ -1,7 +1,5 @@
1	1		package keys
2	2
3		-	import "unicode/utf8"
4		-
5	3		// Bindings maps intercepted Alt keys to actions. A Bindings value is mutable
6	4		// while being built, then treated as frozen once published through an atomic
7	5		// pointer; callers must clone before using mutators.

@@ -110,19 +108,12 @@ func (b *Bindings) conflictingAction(spec KeySpec, action Action) (Action, bool)
110	108		return 0, false
111	109		}
112	110
113		-	func (b *Bindings) actionForAltBytes(data []byte) (Action, int, bool) {
	111	+	func (b *Bindings) actionForAltRune(key rune) (Action, bool) {
114	112		if b == nil {
115	113		b = defaultBindings
116	114		}
117		-	if len(data) == 0 {
118		-	return 0, 0, false
119		-	}
120		-	key, size := utf8.DecodeRune(data)
121		-	if key == utf8.RuneError && size == 1 {
122		-	return 0, 0, false
123		-	}
124	115		action, ok := b.altRunes[key]
125		-	return action, size, ok
	116	+	return action, ok
126	117		}
127	118
128	119		func (b *Bindings) actionForAltArrow(final byte) (Action, bool) {

 package keys
-import "unicode/utf8"
 // Bindings maps intercepted Alt keys to actions. A Bindings value is mutable
 // while being built, then treated as frozen once published through an atomic
 // pointer; callers must clone before using mutators.
 	return 0, false
 }
-func (b *Bindings) actionForAltBytes(data []byte) (Action, int, bool) {
+func (b *Bindings) actionForAltRune(key rune) (Action, bool) {
 	if b == nil {
 		b = defaultBindings
 	}
-	if len(data) == 0 {
-		return 0, 0, false
-	}
-	key, size := utf8.DecodeRune(data)
-	if key == utf8.RuneError && size == 1 {
-		return 0, 0, false
-	}
 	action, ok := b.altRunes[key]
-	return action, size, ok
+	return action, ok
 }
 func (b *Bindings) actionForAltArrow(final byte) (Action, bool) {

M internal/usecase/keys/keyspec_test.go +2 -2


@@ -254,14 +254,14 @@ func TestBuildBindingEntriesFailedOverrideRestoreDoesNotOverwriteEarlierOverride
254	254
255	255		func assertAltRuneAction(t testing.T, bindings Bindings, key rune, want Action) {
256	256		t.Helper()
257		-	got, _, ok := bindings.actionForAltBytes([]byte(string(key)))
	257	+	got, ok := bindings.actionForAltRune(key)
258	258		require.True(t, ok)
259	259		require.Equal(t, want, got)
260	260		}
261	261
262	262		func assertAltRuneUnbound(t testing.T, bindings Bindings, key rune) {
263	263		t.Helper()
264		-	_, _, ok := bindings.actionForAltBytes([]byte(string(key)))
	264	+	_, ok := bindings.actionForAltRune(key)
265	265		require.False(t, ok)
266	266		}
267	267


@@ -254,14 +254,14 @@ func TestBuildBindingEntriesFailedOverrideRestoreDoesNotOverwriteEarlierOverride
254			254
255		func assertAltRuneAction(t testing.T, bindings Bindings, key rune, want Action) {	255		func assertAltRuneAction(t testing.T, bindings Bindings, key rune, want Action) {
256		t.Helper()	256		t.Helper()
257	-	got, _, ok := bindings.actionForAltBytes([]byte(string(key)))	257	+	got, ok := bindings.actionForAltRune(key)
258		require.True(t, ok)	258		require.True(t, ok)
259		require.Equal(t, want, got)	259		require.Equal(t, want, got)
260		}	260		}
261			261
262		func assertAltRuneUnbound(t testing.T, bindings Bindings, key rune) {	262		func assertAltRuneUnbound(t testing.T, bindings Bindings, key rune) {
263		t.Helper()	263		t.Helper()
264	-	_, _, ok := bindings.actionForAltBytes([]byte(string(key)))	264	+	_, ok := bindings.actionForAltRune(key)
265		require.False(t, ok)	265		require.False(t, ok)
266		}	266		}
267			267

A internal/usecase/keys/kittykey/kittykey.go +415 -0

@@ -0,0 +1,415 @@
	1	+	// Package kittykey decodes kitty keyboard protocol key events and re-encodes
	2	+	// them for a receiver that requested a given set of enhancement flags.
	3	+	//
	4	+	// vev enables Disambiguate\|AlternateKeys on the outer terminal. Keys that the
	5	+	// legacy encoding cannot express unambiguously then arrive as
	6	+	// CSI code[:shifted[:base]] [; mods] u, and F1-F4 as CSI [1;mods] P/Q/S.
	7	+	// Everything else stays legacy. Translate rewrites only those sequences, so
	8	+	// legacy input passes through byte-for-byte.
	9	+	//
	10	+	// The package is pure: no I/O, clocks, or ports.
	11	+	package kittykey
	12	+
	13	+	import (
	14	+	"bytes"
	15	+	"strconv"
	16	+	"unicode"
	17	+	"unicode/utf8"
	18	+	)
	19	+
	20	+	// Enhancement flags from the kitty keyboard protocol.
	21	+	const (
	22	+	FlagDisambiguate = 1 << 0
	23	+	FlagReportEvents = 1 << 1
	24	+	FlagAlternateKeys = 1 << 2
	25	+	FlagAllKeys = 1 << 3
	26	+	FlagText = 1 << 4
	27	+
	28	+	// OuterFlags are the flags vev requests from the outer terminal.
	29	+	OuterFlags = FlagDisambiguate \| FlagAlternateKeys
	30	+	)
	31	+
	32	+	// Modifier bits, as encoded in the mods parameter minus one.
	33	+	const (
	34	+	ModShift = 1 << 0
	35	+	ModAlt = 1 << 1
	36	+	ModCtrl = 1 << 2
	37	+	ModSuper = 1 << 3
	38	+	ModHyper = 1 << 4
	39	+	ModMeta = 1 << 5
	40	+
	41	+	modLocks = 1<<6 \| 1<<7 // caps lock, num lock
	42	+	)
	43	+
	44	+	// Key codes of the functional keys that have legacy single-byte forms.
	45	+	const (
	46	+	KeyEscape = 27
	47	+	KeyEnter = 13
	48	+	KeyTab = 9
	49	+	KeyBackspace = 127
	50	+	)
	51	+
	52	+	// Event is one decoded CSI u key press.
	53	+	type Event struct {
	54	+	// Code is the unicode key code: the unshifted key of the current layout.
	55	+	Code rune
	56	+	// Shifted is the shifted key, when reported (AlternateKeys with Shift).
	57	+	Shifted rune
	58	+	// Base is the key in the standard PC-101 layout, when reported.
	59	+	Base rune
	60	+	// Mods is the modifier bit set (ModShift...), lock bits removed.
	61	+	Mods int
	62	+	// Release reports a key-release event (only with FlagReportEvents).
	63	+	Release bool
	64	+	}
	65	+
	66	+	// OnlyMods reports whether exactly the given modifiers are active.
	67	+	func (e Event) OnlyMods(mods int) bool { return e.Mods == mods }
	68	+
	69	+	// Digit reports the top-row digit 1-9 the key represents, preferring the
	70	+	// PC-101 base key so that layouts like AZERTY (whose unshifted digit keys
	71	+	// produce symbols) still map to digits.
	72	+	func (e Event) Digit() (int, bool) {
	73	+	for _, r := range [...]rune{e.Base, e.Code} {
	74	+	if r >= '1' && r <= '9' {
	75	+	return int(r - '0'), true
	76	+	}
	77	+	}
	78	+	return 0, false
	79	+	}
	80	+
	81	+	const maxSeq = 64
	82	+
	83	+	var (
	84	+	pasteOpen = []byte("\x1b[200~")
	85	+	pasteClose = []byte("\x1b[201~")
	86	+	)
	87	+
	88	+	// Parse decodes one CSI u key sequence at the start of data. It returns the
	89	+	// event, the sequence length, and ok. partial reports that data is a strict
	90	+	// prefix of a sequence that could still become a CSI u key event.
	91	+	func Parse(data []byte) (ev Event, n int, ok, partial bool) {
	92	+	if len(data) < 2 \|\| data[0] != 0x1b \|\| data[1] != '[' {
	93	+	return Event{}, 0, false, len(data) == 1 && data[0] == 0x1b
	94	+	}
	95	+	i := 2
	96	+	for ; i < len(data) && i < maxSeq; i++ {
	97	+	b := data[i]
	98	+	if (b >= '0' && b <= '9') \|\| b == ';' \|\| b == ':' {
	99	+	continue
	100	+	}
	101	+	if b != 'u' \|\| i == 2 {
	102	+	return Event{}, 0, false, false
	103	+	}
	104	+	ev, ok := parseParams(data[2:i])
	105	+	return ev, i + 1, ok, false
	106	+	}
	107	+	return Event{}, 0, false, i < maxSeq
	108	+	}
	109	+
	110	+	func parseParams(params []byte) (Event, bool) {
	111	+	fields := splitByte(params, ';')
	112	+	if len(fields) > 3 {
	113	+	return Event{}, false
	114	+	}
	115	+	keys := splitByte(fields[0], ':')
	116	+	if len(keys) > 3 {
	117	+	return Event{}, false
	118	+	}
	119	+	code, ok := atoi(keys[0])
	120	+	if !ok \|\| code == 0 {
	121	+	return Event{}, false
	122	+	}
	123	+	ev := Event{Code: rune(code)}
	124	+	if len(keys) > 1 && len(keys[1]) > 0 {
	125	+	v, ok := atoi(keys[1])
	126	+	if !ok {
	127	+	return Event{}, false
	128	+	}
	129	+	ev.Shifted = rune(v)
	130	+	}
	131	+	if len(keys) > 2 && len(keys[2]) > 0 {
	132	+	v, ok := atoi(keys[2])
	133	+	if !ok {
	134	+	return Event{}, false
	135	+	}
	136	+	ev.Base = rune(v)
	137	+	}
	138	+	if len(fields) > 1 && len(fields[1]) > 0 {
	139	+	sub := splitByte(fields[1], ':')
	140	+	if len(sub) > 2 {
	141	+	return Event{}, false
	142	+	}
	143	+	mods, ok := atoi(sub[0])
	144	+	if !ok \|\| mods < 1 {
	145	+	return Event{}, false
	146	+	}
	147	+	ev.Mods = (mods - 1) &^ modLocks
	148	+	if len(sub) == 2 && len(sub[1]) > 0 {
	149	+	event, ok := atoi(sub[1])
	150	+	if !ok \|\| event < 1 \|\| event > 3 {
	151	+	return Event{}, false
	152	+	}
	153	+	ev.Release = event == 3
	154	+	}
	155	+	}
	156	+	// A third field carries associated text (FlagText); it is not needed to
	157	+	// re-encode the key and is intentionally ignored.
	158	+	return ev, true
	159	+	}
	160	+
	161	+	// Translate rewrites every complete CSI u key sequence and kitty F1-F4 form in
	162	+	// data for a receiver that requested flags. With flags == 0 the result is the
	163	+	// legacy encoding; keys without a legacy form are dropped. With
	164	+	// FlagDisambiguate set, CSI u is kept and only subfields the receiver did not
	165	+	// ask for are removed. Other bytes, including bracketed paste bodies, are
	166	+	// copied unchanged. When nothing changes, data itself is returned.
	167	+	func Translate(data []byte, flags int) []byte {
	168	+	var out []byte
	169	+	last := 0
	170	+	for i := 0; i+2 < len(data); i++ {
	171	+	if data[i] != 0x1b \|\| data[i+1] != '[' {
	172	+	continue
	173	+	}
	174	+	if bytes.HasPrefix(data[i:], pasteOpen) {
	175	+	end := bytes.Index(data[i:], pasteClose)
	176	+	if end < 0 {
	177	+	break
	178	+	}
	179	+	i += end + len(pasteClose) - 1
	180	+	continue
	181	+	}
	182	+	var repl []byte
	183	+	var n int
	184	+	if ev, size, ok, _ := Parse(data[i:]); ok {
	185	+	repl, n = encode(ev, flags), size
	186	+	} else if fkey, size, ok := parseFunctionKey(data[i:]); ok {
	187	+	repl, n = fkey.encode(flags), size
	188	+	} else {
	189	+	continue
	190	+	}
	191	+	if out == nil {
	192	+	out = make([]byte, 0, len(data))
	193	+	}
	194	+	out = append(out, data[last:i]...)
	195	+	out = append(out, repl...)
	196	+	i += n - 1
	197	+	last = i + 1
	198	+	}
	199	+	if out == nil {
	200	+	return data
	201	+	}
	202	+	return append(out, data[last:]...)
	203	+	}
	204	+
	205	+	func encode(ev Event, flags int) []byte {
	206	+	if ev.Release && flags&FlagReportEvents == 0 {
	207	+	return nil
	208	+	}
	209	+	if flags&FlagDisambiguate != 0 \|\| flags&FlagAllKeys != 0 {
	210	+	return encodeCSIu(ev, flags)
	211	+	}
	212	+	return encodeLegacy(ev)
	213	+	}
	214	+
	215	+	func encodeCSIu(ev Event, flags int) []byte {
	216	+	out := []byte("\x1b[")
	217	+	out = strconv.AppendInt(out, int64(ev.Code), 10)
	218	+	if flags&FlagAlternateKeys != 0 && (ev.Shifted != 0 \|\| ev.Base != 0) {
	219	+	out = append(out, ':')
	220	+	if ev.Shifted != 0 {
	221	+	out = strconv.AppendInt(out, int64(ev.Shifted), 10)
	222	+	}
	223	+	if ev.Base != 0 {
	224	+	out = append(out, ':')
	225	+	out = strconv.AppendInt(out, int64(ev.Base), 10)
	226	+	}
	227	+	}
	228	+	release := ev.Release && flags&FlagReportEvents != 0
	229	+	if ev.Mods != 0 \|\| release {
	230	+	out = append(out, ';')
	231	+	out = strconv.AppendInt(out, int64(ev.Mods+1), 10)
	232	+	if release {
	233	+	out = append(out, ":3"...)
	234	+	}
	235	+	}
	236	+	return append(out, 'u')
	237	+	}
	238	+
	239	+	// encodeLegacy produces the xterm-style bytes for ev, or nil when the key has
	240	+	// no legacy representation.
	241	+	func encodeLegacy(ev Event) []byte {
	242	+	if ev.Mods&^(ModShift\|ModAlt\|ModCtrl) != 0 {
	243	+	// Super, Hyper, and Meta have no legacy encoding.
	244	+	return nil
	245	+	}
	246	+	var body []byte
	247	+	switch ev.Code {
	248	+	case KeyEscape:
	249	+	body = []byte{0x1b}
	250	+	case KeyEnter:
	251	+	body = []byte{'\r'}
	252	+	case KeyTab:
	253	+	if ev.Mods&ModShift != 0 {
	254	+	body = []byte("\x1b[Z")
	255	+	} else {
	256	+	body = []byte{'\t'}
	257	+	}
	258	+	case KeyBackspace:
	259	+	if ev.Mods&ModCtrl != 0 {
	260	+	body = []byte{0x08}
	261	+	} else {
	262	+	body = []byte{0x7f}
	263	+	}
	264	+	default:
	265	+	if seq, ok := keypadLegacy[ev.Code]; ok {
	266	+	if mods := ev.Mods &^ ModShift; mods != 0 && len(seq) > 2 && seq[0] == 0x1b {
	267	+	// Modified keypad navigation uses xterm's CSI 1;mods form.
	268	+	return modifiedCSI(seq, ev.Mods)
	269	+	}
	270	+	body = []byte(seq)
	271	+	break
	272	+	}
	273	+	if ev.Code < 0x20 \|\| (ev.Code >= 0xe000 && ev.Code <= 0xf8ff) \|\| !utf8.ValidRune(ev.Code) {
	274	+	// Functional keys in the private use area have no legacy form.
	275	+	return nil
	276	+	}
	277	+	body = legacyText(ev)
	278	+	}
	279	+	if ev.Mods&ModAlt != 0 {
	280	+	return append([]byte{0x1b}, body...)
	281	+	}
	282	+	return body
	283	+	}
	284	+
	285	+	func legacyText(ev Event) []byte {
	286	+	r := ev.Code
	287	+	if ev.Mods&ModShift != 0 {
	288	+	switch {
	289	+	case ev.Shifted != 0:
	290	+	r = ev.Shifted
	291	+	default:
	292	+	r = unicode.ToUpper(r)
	293	+	}
	294	+	}
	295	+	if ev.Mods&ModCtrl != 0 {
	296	+	if c, ok := ctrlByte(r); ok {
	297	+	return []byte{c}
	298	+	}
	299	+	// Non-Latin layouts: fall back to the PC-101 base key so Ctrl+letter
	300	+	// still produces its control byte.
	301	+	if c, ok := ctrlByte(ev.Base); ok {
	302	+	return []byte{c}
	303	+	}
	304	+	}
	305	+	return utf8.AppendRune(nil, r)
	306	+	}
	307	+
	308	+	// ctrlByte maps a key to the C0 byte xterm sends for Ctrl+key.
	309	+	func ctrlByte(r rune) (byte, bool) {
	310	+	switch {
	311	+	case r >= 'a' && r <= 'z':
	312	+	return byte(r - 'a' + 1), true
	313	+	case r >= 'A' && r <= 'Z':
	314	+	return byte(r - 'A' + 1), true
	315	+	}
	316	+	switch r {
	317	+	case ' ', '@', '2':
	318	+	return 0x00, true
	319	+	case '[', '3':
	320	+	return 0x1b, true
	321	+	case '\\', '4':
	322	+	return 0x1c, true
	323	+	case ']', '5':
	324	+	return 0x1d, true
	325	+	case '^', '6', '~':
	326	+	return 0x1e, true
	327	+	case '_', '/', '7', '-':
	328	+	return 0x1f, true
	329	+	case '8', '?':
	330	+	return 0x7f, true
	331	+	}
	332	+	return 0, false
	333	+	}
	334	+
	335	+	// keypadLegacy maps kitty keypad private-use codes (reported as separate keys
	336	+	// under FlagDisambiguate) to the bytes a legacy terminal sends.
	337	+	var keypadLegacy = map[rune]string{
	338	+	57399: "0", 57400: "1", 57401: "2", 57402: "3", 57403: "4",
	339	+	57404: "5", 57405: "6", 57406: "7", 57407: "8", 57408: "9",
	340	+	57409: ".", 57410: "/", 57411: "*", 57412: "-", 57413: "+",
	341	+	57414: "\r", 57415: "=", 57416: ",",
	342	+	57417: "\x1b[D", 57418: "\x1b[C", 57419: "\x1b[A", 57420: "\x1b[B",
	343	+	57421: "\x1b[5~", 57422: "\x1b[6~", 57423: "\x1b[H", 57424: "\x1b[F",
	344	+	57425: "\x1b[2~", 57426: "\x1b[3~", 57427: "\x1b[E",
	345	+	}
	346	+
	347	+	// modifiedCSI turns a legacy cursor (CSI X) or tilde (CSI n ~) key into its
	348	+	// xterm modified form: CSI 1;m X or CSI n;m ~.
	349	+	func modifiedCSI(seq string, mods int) []byte {
	350	+	m := strconv.Itoa(mods + 1)
	351	+	final := seq[len(seq)-1]
	352	+	if final == '~' {
	353	+	return []byte(seq[:len(seq)-1] + ";" + m + "~")
	354	+	}
	355	+	return []byte("\x1b[1;" + m + string(final))
	356	+	}
	357	+
	358	+	// functionKey is a kitty CSI [1;mods] P\|Q\|S form of F1, F2, or F4. Legacy
	359	+	// terminals send SS3 P\|Q\|S when unmodified.
	360	+	type functionKey struct {
	361	+	final byte
	362	+	mods []byte // the raw "1;mods" parameter bytes, empty when unmodified
	363	+	}
	364	+
	365	+	func parseFunctionKey(data []byte) (functionKey, int, bool) {
	366	+	for i := 2; i < len(data) && i < maxSeq; i++ {
	367	+	b := data[i]
	368	+	if (b >= '0' && b <= '9') \|\| b == ';' \|\| b == ':' {
	369	+	continue
	370	+	}
	371	+	if b != 'P' && b != 'Q' && b != 'S' {
	372	+	return functionKey{}, 0, false
	373	+	}
	374	+	params := data[2:i]
	375	+	if len(params) != 0 && (len(params) < 3 \|\| params[0] != '1' \|\| params[1] != ';') {
	376	+	return functionKey{}, 0, false
	377	+	}
	378	+	return functionKey{final: b, mods: params}, i + 1, true
	379	+	}
	380	+	return functionKey{}, 0, false
	381	+	}
	382	+
	383	+	func (f functionKey) encode(flags int) []byte {
	384	+	if len(f.mods) == 0 && flags&FlagDisambiguate == 0 {
	385	+	return []byte{0x1b, 'O', f.final}
	386	+	}
	387	+	out := append([]byte("\x1b["), f.mods...)
	388	+	return append(out, f.final)
	389	+	}
	390	+
	391	+	func splitByte(b []byte, sep byte) [][]byte {
	392	+	var out [][]byte
	393	+	start := 0
	394	+	for i := 0; i <= len(b); i++ {
	395	+	if i == len(b) \|\| b[i] == sep {
	396	+	out = append(out, b[start:i])
	397	+	start = i + 1
	398	+	}
	399	+	}
	400	+	return out
	401	+	}
	402	+
	403	+	func atoi(b []byte) (int, bool) {
	404	+	if len(b) == 0 \|\| len(b) > 7 {
	405	+	return 0, false
	406	+	}
	407	+	n := 0
	408	+	for _, c := range b {
	409	+	if c < '0' \|\| c > '9' {
	410	+	return 0, false
	411	+	}
	412	+	n = n*10 + int(c-'0')
	413	+	}
	414	+	return n, true
	415	+	}

@@ -0,0 +1,415 @@
	1	+	// Package kittykey decodes kitty keyboard protocol key events and re-encodes
	2	+	// them for a receiver that requested a given set of enhancement flags.
	3	+	//
	4	+	// vev enables Disambiguate\|AlternateKeys on the outer terminal. Keys that the
	5	+	// legacy encoding cannot express unambiguously then arrive as
	6	+	// CSI code[:shifted[:base]] [; mods] u, and F1-F4 as CSI [1;mods] P/Q/S.
	7	+	// Everything else stays legacy. Translate rewrites only those sequences, so
	8	+	// legacy input passes through byte-for-byte.
	9	+	//
	10	+	// The package is pure: no I/O, clocks, or ports.
	11	+	package kittykey
	12	+
	13	+	import (
	14	+	"bytes"
	15	+	"strconv"
	16	+	"unicode"
	17	+	"unicode/utf8"
	18	+	)
	19	+
	20	+	// Enhancement flags from the kitty keyboard protocol.
	21	+	const (
	22	+	FlagDisambiguate = 1 << 0
	23	+	FlagReportEvents = 1 << 1
	24	+	FlagAlternateKeys = 1 << 2
	25	+	FlagAllKeys = 1 << 3
	26	+	FlagText = 1 << 4
	27	+
	28	+	// OuterFlags are the flags vev requests from the outer terminal.
	29	+	OuterFlags = FlagDisambiguate \| FlagAlternateKeys
	30	+	)
	31	+
	32	+	// Modifier bits, as encoded in the mods parameter minus one.
	33	+	const (
	34	+	ModShift = 1 << 0
	35	+	ModAlt = 1 << 1
	36	+	ModCtrl = 1 << 2
	37	+	ModSuper = 1 << 3
	38	+	ModHyper = 1 << 4
	39	+	ModMeta = 1 << 5
	40	+
	41	+	modLocks = 1<<6 \| 1<<7 // caps lock, num lock
	42	+	)
	43	+
	44	+	// Key codes of the functional keys that have legacy single-byte forms.
	45	+	const (
	46	+	KeyEscape = 27
	47	+	KeyEnter = 13
	48	+	KeyTab = 9
	49	+	KeyBackspace = 127
	50	+	)
	51	+
	52	+	// Event is one decoded CSI u key press.
	53	+	type Event struct {
	54	+	// Code is the unicode key code: the unshifted key of the current layout.
	55	+	Code rune
	56	+	// Shifted is the shifted key, when reported (AlternateKeys with Shift).
	57	+	Shifted rune
	58	+	// Base is the key in the standard PC-101 layout, when reported.
	59	+	Base rune
	60	+	// Mods is the modifier bit set (ModShift...), lock bits removed.
	61	+	Mods int
	62	+	// Release reports a key-release event (only with FlagReportEvents).
	63	+	Release bool
	64	+	}
	65	+
	66	+	// OnlyMods reports whether exactly the given modifiers are active.
	67	+	func (e Event) OnlyMods(mods int) bool { return e.Mods == mods }
	68	+
	69	+	// Digit reports the top-row digit 1-9 the key represents, preferring the
	70	+	// PC-101 base key so that layouts like AZERTY (whose unshifted digit keys
	71	+	// produce symbols) still map to digits.
	72	+	func (e Event) Digit() (int, bool) {
	73	+	for _, r := range [...]rune{e.Base, e.Code} {
	74	+	if r >= '1' && r <= '9' {
	75	+	return int(r - '0'), true
	76	+	}
	77	+	}
	78	+	return 0, false
	79	+	}
	80	+
	81	+	const maxSeq = 64
	82	+
	83	+	var (
	84	+	pasteOpen = []byte("\x1b[200~")
	85	+	pasteClose = []byte("\x1b[201~")
	86	+	)
	87	+
	88	+	// Parse decodes one CSI u key sequence at the start of data. It returns the
	89	+	// event, the sequence length, and ok. partial reports that data is a strict
	90	+	// prefix of a sequence that could still become a CSI u key event.
	91	+	func Parse(data []byte) (ev Event, n int, ok, partial bool) {
	92	+	if len(data) < 2 \|\| data[0] != 0x1b \|\| data[1] != '[' {
	93	+	return Event{}, 0, false, len(data) == 1 && data[0] == 0x1b
	94	+	}
	95	+	i := 2
	96	+	for ; i < len(data) && i < maxSeq; i++ {
	97	+	b := data[i]
	98	+	if (b >= '0' && b <= '9') \|\| b == ';' \|\| b == ':' {
	99	+	continue
	100	+	}
	101	+	if b != 'u' \|\| i == 2 {
	102	+	return Event{}, 0, false, false
	103	+	}
	104	+	ev, ok := parseParams(data[2:i])
	105	+	return ev, i + 1, ok, false
	106	+	}
	107	+	return Event{}, 0, false, i < maxSeq
	108	+	}
	109	+
	110	+	func parseParams(params []byte) (Event, bool) {
	111	+	fields := splitByte(params, ';')
	112	+	if len(fields) > 3 {
	113	+	return Event{}, false
	114	+	}
	115	+	keys := splitByte(fields[0], ':')
	116	+	if len(keys) > 3 {
	117	+	return Event{}, false
	118	+	}
	119	+	code, ok := atoi(keys[0])
	120	+	if !ok \|\| code == 0 {
	121	+	return Event{}, false
	122	+	}
	123	+	ev := Event{Code: rune(code)}
	124	+	if len(keys) > 1 && len(keys[1]) > 0 {
	125	+	v, ok := atoi(keys[1])
	126	+	if !ok {
	127	+	return Event{}, false
	128	+	}
	129	+	ev.Shifted = rune(v)
	130	+	}
	131	+	if len(keys) > 2 && len(keys[2]) > 0 {
	132	+	v, ok := atoi(keys[2])
	133	+	if !ok {
	134	+	return Event{}, false
	135	+	}
	136	+	ev.Base = rune(v)
	137	+	}
	138	+	if len(fields) > 1 && len(fields[1]) > 0 {
	139	+	sub := splitByte(fields[1], ':')
	140	+	if len(sub) > 2 {
	141	+	return Event{}, false
	142	+	}
	143	+	mods, ok := atoi(sub[0])
	144	+	if !ok \|\| mods < 1 {
	145	+	return Event{}, false
	146	+	}
	147	+	ev.Mods = (mods - 1) &^ modLocks
	148	+	if len(sub) == 2 && len(sub[1]) > 0 {
	149	+	event, ok := atoi(sub[1])
	150	+	if !ok \|\| event < 1 \|\| event > 3 {
	151	+	return Event{}, false
	152	+	}
	153	+	ev.Release = event == 3
	154	+	}
	155	+	}
	156	+	// A third field carries associated text (FlagText); it is not needed to
	157	+	// re-encode the key and is intentionally ignored.
	158	+	return ev, true
	159	+	}
	160	+
	161	+	// Translate rewrites every complete CSI u key sequence and kitty F1-F4 form in
	162	+	// data for a receiver that requested flags. With flags == 0 the result is the
	163	+	// legacy encoding; keys without a legacy form are dropped. With
	164	+	// FlagDisambiguate set, CSI u is kept and only subfields the receiver did not
	165	+	// ask for are removed. Other bytes, including bracketed paste bodies, are
	166	+	// copied unchanged. When nothing changes, data itself is returned.
	167	+	func Translate(data []byte, flags int) []byte {
	168	+	var out []byte
	169	+	last := 0
	170	+	for i := 0; i+2 < len(data); i++ {
	171	+	if data[i] != 0x1b \|\| data[i+1] != '[' {
	172	+	continue
	173	+	}
	174	+	if bytes.HasPrefix(data[i:], pasteOpen) {
	175	+	end := bytes.Index(data[i:], pasteClose)
	176	+	if end < 0 {
	177	+	break
	178	+	}
	179	+	i += end + len(pasteClose) - 1
	180	+	continue
	181	+	}
	182	+	var repl []byte
	183	+	var n int
	184	+	if ev, size, ok, _ := Parse(data[i:]); ok {
	185	+	repl, n = encode(ev, flags), size
	186	+	} else if fkey, size, ok := parseFunctionKey(data[i:]); ok {
	187	+	repl, n = fkey.encode(flags), size
	188	+	} else {
	189	+	continue
	190	+	}
	191	+	if out == nil {
	192	+	out = make([]byte, 0, len(data))
	193	+	}
	194	+	out = append(out, data[last:i]...)
	195	+	out = append(out, repl...)
	196	+	i += n - 1
	197	+	last = i + 1
	198	+	}
	199	+	if out == nil {
	200	+	return data
	201	+	}
	202	+	return append(out, data[last:]...)
	203	+	}
	204	+
	205	+	func encode(ev Event, flags int) []byte {
	206	+	if ev.Release && flags&FlagReportEvents == 0 {
	207	+	return nil
	208	+	}
	209	+	if flags&FlagDisambiguate != 0 \|\| flags&FlagAllKeys != 0 {
	210	+	return encodeCSIu(ev, flags)
	211	+	}
	212	+	return encodeLegacy(ev)
	213	+	}
	214	+
	215	+	func encodeCSIu(ev Event, flags int) []byte {
	216	+	out := []byte("\x1b[")
	217	+	out = strconv.AppendInt(out, int64(ev.Code), 10)
	218	+	if flags&FlagAlternateKeys != 0 && (ev.Shifted != 0 \|\| ev.Base != 0) {
	219	+	out = append(out, ':')
	220	+	if ev.Shifted != 0 {
	221	+	out = strconv.AppendInt(out, int64(ev.Shifted), 10)
	222	+	}
	223	+	if ev.Base != 0 {
	224	+	out = append(out, ':')
	225	+	out = strconv.AppendInt(out, int64(ev.Base), 10)
	226	+	}
	227	+	}
	228	+	release := ev.Release && flags&FlagReportEvents != 0
	229	+	if ev.Mods != 0 \|\| release {
	230	+	out = append(out, ';')
	231	+	out = strconv.AppendInt(out, int64(ev.Mods+1), 10)
	232	+	if release {
	233	+	out = append(out, ":3"...)
	234	+	}
	235	+	}
	236	+	return append(out, 'u')
	237	+	}
	238	+
	239	+	// encodeLegacy produces the xterm-style bytes for ev, or nil when the key has
	240	+	// no legacy representation.
	241	+	func encodeLegacy(ev Event) []byte {
	242	+	if ev.Mods&^(ModShift\|ModAlt\|ModCtrl) != 0 {
	243	+	// Super, Hyper, and Meta have no legacy encoding.
	244	+	return nil
	245	+	}
	246	+	var body []byte
	247	+	switch ev.Code {
	248	+	case KeyEscape:
	249	+	body = []byte{0x1b}
	250	+	case KeyEnter:
	251	+	body = []byte{'\r'}
	252	+	case KeyTab:
	253	+	if ev.Mods&ModShift != 0 {
	254	+	body = []byte("\x1b[Z")
	255	+	} else {
	256	+	body = []byte{'\t'}
	257	+	}
	258	+	case KeyBackspace:
	259	+	if ev.Mods&ModCtrl != 0 {
	260	+	body = []byte{0x08}
	261	+	} else {
	262	+	body = []byte{0x7f}
	263	+	}
	264	+	default:
	265	+	if seq, ok := keypadLegacy[ev.Code]; ok {
	266	+	if mods := ev.Mods &^ ModShift; mods != 0 && len(seq) > 2 && seq[0] == 0x1b {
	267	+	// Modified keypad navigation uses xterm's CSI 1;mods form.
	268	+	return modifiedCSI(seq, ev.Mods)
	269	+	}
	270	+	body = []byte(seq)
	271	+	break
	272	+	}
	273	+	if ev.Code < 0x20 \|\| (ev.Code >= 0xe000 && ev.Code <= 0xf8ff) \|\| !utf8.ValidRune(ev.Code) {
	274	+	// Functional keys in the private use area have no legacy form.
	275	+	return nil
	276	+	}
	277	+	body = legacyText(ev)
	278	+	}
	279	+	if ev.Mods&ModAlt != 0 {
	280	+	return append([]byte{0x1b}, body...)
	281	+	}
	282	+	return body
	283	+	}
	284	+
	285	+	func legacyText(ev Event) []byte {
	286	+	r := ev.Code
	287	+	if ev.Mods&ModShift != 0 {
	288	+	switch {
	289	+	case ev.Shifted != 0:
	290	+	r = ev.Shifted
	291	+	default:
	292	+	r = unicode.ToUpper(r)
	293	+	}
	294	+	}
	295	+	if ev.Mods&ModCtrl != 0 {
	296	+	if c, ok := ctrlByte(r); ok {
	297	+	return []byte{c}
	298	+	}
	299	+	// Non-Latin layouts: fall back to the PC-101 base key so Ctrl+letter
	300	+	// still produces its control byte.
	301	+	if c, ok := ctrlByte(ev.Base); ok {
	302	+	return []byte{c}
	303	+	}
	304	+	}
	305	+	return utf8.AppendRune(nil, r)
	306	+	}
	307	+
	308	+	// ctrlByte maps a key to the C0 byte xterm sends for Ctrl+key.
	309	+	func ctrlByte(r rune) (byte, bool) {
	310	+	switch {
	311	+	case r >= 'a' && r <= 'z':
	312	+	return byte(r - 'a' + 1), true
	313	+	case r >= 'A' && r <= 'Z':
	314	+	return byte(r - 'A' + 1), true
	315	+	}
	316	+	switch r {
	317	+	case ' ', '@', '2':
	318	+	return 0x00, true
	319	+	case '[', '3':
	320	+	return 0x1b, true
	321	+	case '\\', '4':
	322	+	return 0x1c, true
	323	+	case ']', '5':
	324	+	return 0x1d, true
	325	+	case '^', '6', '~':
	326	+	return 0x1e, true
	327	+	case '_', '/', '7', '-':
	328	+	return 0x1f, true
	329	+	case '8', '?':
	330	+	return 0x7f, true
	331	+	}
	332	+	return 0, false
	333	+	}
	334	+
	335	+	// keypadLegacy maps kitty keypad private-use codes (reported as separate keys
	336	+	// under FlagDisambiguate) to the bytes a legacy terminal sends.
	337	+	var keypadLegacy = map[rune]string{
	338	+	57399: "0", 57400: "1", 57401: "2", 57402: "3", 57403: "4",
	339	+	57404: "5", 57405: "6", 57406: "7", 57407: "8", 57408: "9",
	340	+	57409: ".", 57410: "/", 57411: "*", 57412: "-", 57413: "+",
	341	+	57414: "\r", 57415: "=", 57416: ",",
	342	+	57417: "\x1b[D", 57418: "\x1b[C", 57419: "\x1b[A", 57420: "\x1b[B",
	343	+	57421: "\x1b[5~", 57422: "\x1b[6~", 57423: "\x1b[H", 57424: "\x1b[F",
	344	+	57425: "\x1b[2~", 57426: "\x1b[3~", 57427: "\x1b[E",
	345	+	}
	346	+
	347	+	// modifiedCSI turns a legacy cursor (CSI X) or tilde (CSI n ~) key into its
	348	+	// xterm modified form: CSI 1;m X or CSI n;m ~.
	349	+	func modifiedCSI(seq string, mods int) []byte {
	350	+	m := strconv.Itoa(mods + 1)
	351	+	final := seq[len(seq)-1]
	352	+	if final == '~' {
	353	+	return []byte(seq[:len(seq)-1] + ";" + m + "~")
	354	+	}
	355	+	return []byte("\x1b[1;" + m + string(final))
	356	+	}
	357	+
	358	+	// functionKey is a kitty CSI [1;mods] P\|Q\|S form of F1, F2, or F4. Legacy
	359	+	// terminals send SS3 P\|Q\|S when unmodified.
	360	+	type functionKey struct {
	361	+	final byte
	362	+	mods []byte // the raw "1;mods" parameter bytes, empty when unmodified
	363	+	}
	364	+
	365	+	func parseFunctionKey(data []byte) (functionKey, int, bool) {
	366	+	for i := 2; i < len(data) && i < maxSeq; i++ {
	367	+	b := data[i]
	368	+	if (b >= '0' && b <= '9') \|\| b == ';' \|\| b == ':' {
	369	+	continue
	370	+	}
	371	+	if b != 'P' && b != 'Q' && b != 'S' {
	372	+	return functionKey{}, 0, false
	373	+	}
	374	+	params := data[2:i]
	375	+	if len(params) != 0 && (len(params) < 3 \|\| params[0] != '1' \|\| params[1] != ';') {
	376	+	return functionKey{}, 0, false
	377	+	}
	378	+	return functionKey{final: b, mods: params}, i + 1, true
	379	+	}
	380	+	return functionKey{}, 0, false
	381	+	}
	382	+
	383	+	func (f functionKey) encode(flags int) []byte {
	384	+	if len(f.mods) == 0 && flags&FlagDisambiguate == 0 {
	385	+	return []byte{0x1b, 'O', f.final}
	386	+	}
	387	+	out := append([]byte("\x1b["), f.mods...)
	388	+	return append(out, f.final)
	389	+	}
	390	+
	391	+	func splitByte(b []byte, sep byte) [][]byte {
	392	+	var out [][]byte
	393	+	start := 0
	394	+	for i := 0; i <= len(b); i++ {
	395	+	if i == len(b) \|\| b[i] == sep {
	396	+	out = append(out, b[start:i])
	397	+	start = i + 1
	398	+	}
	399	+	}
	400	+	return out
	401	+	}
	402	+
	403	+	func atoi(b []byte) (int, bool) {
	404	+	if len(b) == 0 \|\| len(b) > 7 {
	405	+	return 0, false
	406	+	}
	407	+	n := 0
	408	+	for _, c := range b {
	409	+	if c < '0' \|\| c > '9' {
	410	+	return 0, false
	411	+	}
	412	+	n = n*10 + int(c-'0')
	413	+	}
	414	+	return n, true
	415	+	}

A internal/usecase/keys/kittykey/kittykey_test.go +172 -0

@@ -0,0 +1,172 @@
	1	+	package kittykey
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	"github.com/stretchr/testify/require"
	7	+	)
	8	+
	9	+	func TestParse(t *testing.T) {
	10	+	tests := []struct {
	11	+	name string
	12	+	in string
	13	+	ev Event
	14	+	ok bool
	15	+	partial bool
	16	+	}{
	17	+	{name: "plain", in: "\x1b[97u", ev: Event{Code: 'a'}, ok: true},
	18	+	{name: "ctrl", in: "\x1b[49;5u", ev: Event{Code: '1', Mods: ModCtrl}, ok: true},
	19	+	{name: "azerty ctrl 1 with base", in: "\x1b[38::49;5u", ev: Event{Code: '&', Base: '1', Mods: ModCtrl}, ok: true},
	20	+	{name: "shifted and base", in: "\x1b[97:65:97;2u", ev: Event{Code: 'a', Shifted: 'A', Base: 'a', Mods: ModShift}, ok: true},
	21	+	{name: "locks stripped", in: "\x1b[97;197u", ev: Event{Code: 'a', Mods: ModCtrl}, ok: true},
	22	+	{name: "release", in: "\x1b[97;1:3u", ev: Event{Code: 'a', Release: true}, ok: true},
	23	+	{name: "text field ignored", in: "\x1b[97;1;97u", ev: Event{Code: 'a'}, ok: true},
	24	+	{name: "trailing garbage", in: "\x1b[97uxyz", ev: Event{Code: 'a'}, ok: true},
	25	+	{name: "truncated", in: "\x1b[49;5", partial: true},
	26	+	{name: "truncated csi", in: "\x1b[", partial: true},
	27	+	{name: "truncated esc", in: "\x1b", partial: true},
	28	+	{name: "empty params", in: "\x1b[u"},
	29	+	{name: "zero code", in: "\x1b[0u"},
	30	+	{name: "mods zero", in: "\x1b[97;0u"},
	31	+	{name: "bad event", in: "\x1b[97;1:4u"},
	32	+	{name: "too many fields", in: "\x1b[97;1;2;3u"},
	33	+	{name: "other final", in: "\x1b[1;5A"},
	34	+	{name: "private reply", in: "\x1b[?5u"},
	35	+	{name: "huge number", in: "\x1b[99999999u"},
	36	+	{name: "not csi", in: "a"},
	37	+	}
	38	+	for _, tt := range tests {
	39	+	t.Run(tt.name, func(t *testing.T) {
	40	+	ev, n, ok, partial := Parse([]byte(tt.in))
	41	+	require.Equal(t, tt.ok, ok)
	42	+	require.Equal(t, tt.partial, partial)
	43	+	if tt.ok {
	44	+	require.Equal(t, tt.ev, ev)
	45	+	want := len(tt.in)
	46	+	if tt.name == "trailing garbage" {
	47	+	want -= len("xyz")
	48	+	}
	49	+	require.Equal(t, want, n)
	50	+	}
	51	+	})
	52	+	}
	53	+	}
	54	+
	55	+	func TestTranslateLegacy(t *testing.T) {
	56	+	tests := []struct {
	57	+	name string
	58	+	in string
	59	+	want string
	60	+	}{
	61	+	{name: "legacy passthrough", in: "hello\x1b[A\x1bj\r", want: "hello\x1b[A\x1bj\r"},
	62	+	{name: "escape", in: "\x1b[27u", want: "\x1b"},
	63	+	{name: "alt escape", in: "\x1b[27;3u", want: "\x1b\x1b"},
	64	+	{name: "enter", in: "\x1b[13u", want: "\r"},
	65	+	{name: "tab", in: "\x1b[9u", want: "\t"},
	66	+	{name: "shift tab", in: "\x1b[9;2u", want: "\x1b[Z"},
	67	+	{name: "backspace", in: "\x1b[127u", want: "\x7f"},
	68	+	{name: "ctrl backspace", in: "\x1b[127;5u", want: "\x08"},
	69	+	{name: "ctrl i", in: "\x1b[105;5u", want: "\t"},
	70	+	{name: "ctrl a", in: "\x1b[97;5u", want: "\x01"},
	71	+	{name: "ctrl alt a", in: "\x1b[97;7u", want: "\x1b\x01"},
	72	+	{name: "ctrl shift a", in: "\x1b[97:65;6u", want: "\x01"},
	73	+	{name: "ctrl space", in: "\x1b[32;5u", want: "\x00"},
	74	+	{name: "ctrl 1 has no control byte", in: "\x1b[49;5u", want: "1"},
	75	+	{name: "ctrl 3", in: "\x1b[51;5u", want: "\x1b"},
	76	+	{name: "azerty ctrl ampersand", in: "\x1b[38::49;5u", want: "&"},
	77	+	{name: "cyrillic ctrl uses base", in: "\x1b[1092::97;5u", want: "\x01"},
	78	+	{name: "shift letter with shifted", in: "\x1b[97:65;2u", want: "A"},
	79	+	{name: "shift letter without shifted", in: "\x1b[97;2u", want: "A"},
	80	+	{name: "alt utf8", in: "\x1b[233;3u", want: "\x1bé"},
	81	+	{name: "super dropped", in: "\x1b[97;9u", want: ""},
	82	+	{name: "release dropped", in: "\x1b[97;1:3u", want: ""},
	83	+	{name: "private use dropped", in: "\x1b[57441u", want: ""},
	84	+	{name: "keypad digit", in: "\x1b[57400u", want: "1"},
	85	+	{name: "keypad enter", in: "\x1b[57414u", want: "\r"},
	86	+	{name: "ctrl keypad left", in: "\x1b[57417;5u", want: "\x1b[1;5D"},
	87	+	{name: "ctrl keypad delete", in: "\x1b[57426;5u", want: "\x1b[3;5~"},
	88	+	{name: "keypad begin", in: "\x1b[57427u", want: "\x1b[E"},
	89	+	{name: "keypad separator", in: "\x1b[57416u", want: ","},
	90	+	{name: "f1 unmodified", in: "\x1b[P", want: "\x1bOP"},
	91	+	{name: "f2 modified kept", in: "\x1b[1;5Q", want: "\x1b[1;5Q"},
	92	+	{name: "mixed", in: "a\x1b[97;5ub\x1b[27uc", want: "a\x01b\x1bc"},
	93	+	{name: "truncated prefix untouched", in: "x\x1b[97;5", want: "x\x1b[97;5"},
	94	+	{name: "trailing garbage", in: "\x1b[97;5u\x1b[zz", want: "\x01\x1b[zz"},
	95	+	{name: "paste body untouched", in: "\x1b[200~\x1b[97;5u\x1b[201~\x1b[97;5u", want: "\x1b[200~\x1b[97;5u\x1b[201~\x01"},
	96	+	{name: "unterminated paste untouched", in: "\x1b[200~\x1b[97;5u", want: "\x1b[200~\x1b[97;5u"},
	97	+	{name: "mouse untouched", in: "\x1b[<0;1;1M", want: "\x1b[<0;1;1M"},
	98	+	{name: "keyboard reply untouched", in: "\x1b[?5u", want: "\x1b[?5u"},
	99	+	}
	100	+	for _, tt := range tests {
	101	+	t.Run(tt.name, func(t *testing.T) {
	102	+	require.Equal(t, []byte(tt.want), append([]byte{}, Translate([]byte(tt.in), 0)...))
	103	+	})
	104	+	}
	105	+	}
	106	+
	107	+	func TestTranslateKittyReceiver(t *testing.T) {
	108	+	tests := []struct {
	109	+	name string
	110	+	in string
	111	+	flags int
	112	+	want string
	113	+	}{
	114	+	{name: "same flags identity", in: "\x1b[38::49;5u", flags: OuterFlags, want: "\x1b[38::49;5u"},
	115	+	{name: "strip alternates", in: "\x1b[38::49;5u", flags: FlagDisambiguate, want: "\x1b[38;5u"},
	116	+	{name: "keep shifted", in: "\x1b[97:65;2u", flags: FlagDisambiguate \| FlagAlternateKeys, want: "\x1b[97:65;2u"},
	117	+	{name: "unmodified", in: "\x1b[27u", flags: FlagDisambiguate, want: "\x1b[27u"},
	118	+	{name: "release dropped without events", in: "\x1b[97;1:3u", flags: FlagDisambiguate, want: ""},
	119	+	{name: "release kept with events", in: "\x1b[97;1:3u", flags: FlagDisambiguate \| FlagReportEvents, want: "\x1b[97;1:3u"},
	120	+	{name: "f1 stays csi", in: "\x1b[P", flags: FlagDisambiguate, want: "\x1b[P"},
	121	+	}
	122	+	for _, tt := range tests {
	123	+	t.Run(tt.name, func(t *testing.T) {
	124	+	require.Equal(t, []byte(tt.want), append([]byte{}, Translate([]byte(tt.in), tt.flags)...))
	125	+	})
	126	+	}
	127	+	}
	128	+
	129	+	func TestTranslateReturnsInputWhenUnchanged(t *testing.T) {
	130	+	in := []byte("plain \x1b[A text")
	131	+	out := Translate(in, 0)
	132	+	require.Same(t, &in[0], &out[0])
	133	+	}
	134	+
	135	+	func TestEventDigit(t *testing.T) {
	136	+	tests := []struct {
	137	+	ev Event
	138	+	want int
	139	+	ok bool
	140	+	}{
	141	+	{ev: Event{Code: '1'}, want: 1, ok: true},
	142	+	{ev: Event{Code: '&', Base: '1'}, want: 1, ok: true},
	143	+	{ev: Event{Code: 'é', Base: '2'}, want: 2, ok: true},
	144	+	{ev: Event{Code: '0'}},
	145	+	{ev: Event{Code: 'a'}},
	146	+	}
	147	+	for _, tt := range tests {
	148	+	got, ok := tt.ev.Digit()
	149	+	require.Equal(t, tt.ok, ok, "%+v", tt.ev)
	150	+	require.Equal(t, tt.want, got)
	151	+	}
	152	+	}
	153	+
	154	+	func FuzzTranslate(f *testing.F) {
	155	+	for _, seed := range []string{"\x1b[97;5u", "\x1b[38::49;5u", "\x1b[200~x\x1b[201~", "\x1b[1;5P", "a\x1b["} {
	156	+	f.Add([]byte(seed), 0)
	157	+	f.Add([]byte(seed), OuterFlags)
	158	+	}
	159	+	f.Fuzz(func(t *testing.T, data []byte, flags int) {
	160	+	out := Translate(data, flags&0x1f)
	161	+	// Translation never grows input by more than a bounded factor.
	162	+	require.LessOrEqual(t, len(out), 2*len(data)+16)
	163	+	})
	164	+	}
	165	+
	166	+	func BenchmarkTranslateLegacyText(b *testing.B) {
	167	+	data := []byte("the quick brown fox jumps over the lazy dog\r")
	168	+	b.ReportAllocs()
	169	+	for b.Loop() {
	170	+	_ = Translate(data, 0)
	171	+	}
	172	+	}

@@ -0,0 +1,172 @@
	1	+	package kittykey
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	"github.com/stretchr/testify/require"
	7	+	)
	8	+
	9	+	func TestParse(t *testing.T) {
	10	+	tests := []struct {
	11	+	name string
	12	+	in string
	13	+	ev Event
	14	+	ok bool
	15	+	partial bool
	16	+	}{
	17	+	{name: "plain", in: "\x1b[97u", ev: Event{Code: 'a'}, ok: true},
	18	+	{name: "ctrl", in: "\x1b[49;5u", ev: Event{Code: '1', Mods: ModCtrl}, ok: true},
	19	+	{name: "azerty ctrl 1 with base", in: "\x1b[38::49;5u", ev: Event{Code: '&', Base: '1', Mods: ModCtrl}, ok: true},
	20	+	{name: "shifted and base", in: "\x1b[97:65:97;2u", ev: Event{Code: 'a', Shifted: 'A', Base: 'a', Mods: ModShift}, ok: true},
	21	+	{name: "locks stripped", in: "\x1b[97;197u", ev: Event{Code: 'a', Mods: ModCtrl}, ok: true},
	22	+	{name: "release", in: "\x1b[97;1:3u", ev: Event{Code: 'a', Release: true}, ok: true},
	23	+	{name: "text field ignored", in: "\x1b[97;1;97u", ev: Event{Code: 'a'}, ok: true},
	24	+	{name: "trailing garbage", in: "\x1b[97uxyz", ev: Event{Code: 'a'}, ok: true},
	25	+	{name: "truncated", in: "\x1b[49;5", partial: true},
	26	+	{name: "truncated csi", in: "\x1b[", partial: true},
	27	+	{name: "truncated esc", in: "\x1b", partial: true},
	28	+	{name: "empty params", in: "\x1b[u"},
	29	+	{name: "zero code", in: "\x1b[0u"},
	30	+	{name: "mods zero", in: "\x1b[97;0u"},
	31	+	{name: "bad event", in: "\x1b[97;1:4u"},
	32	+	{name: "too many fields", in: "\x1b[97;1;2;3u"},
	33	+	{name: "other final", in: "\x1b[1;5A"},
	34	+	{name: "private reply", in: "\x1b[?5u"},
	35	+	{name: "huge number", in: "\x1b[99999999u"},
	36	+	{name: "not csi", in: "a"},
	37	+	}
	38	+	for _, tt := range tests {
	39	+	t.Run(tt.name, func(t *testing.T) {
	40	+	ev, n, ok, partial := Parse([]byte(tt.in))
	41	+	require.Equal(t, tt.ok, ok)
	42	+	require.Equal(t, tt.partial, partial)
	43	+	if tt.ok {
	44	+	require.Equal(t, tt.ev, ev)
	45	+	want := len(tt.in)
	46	+	if tt.name == "trailing garbage" {
	47	+	want -= len("xyz")
	48	+	}
	49	+	require.Equal(t, want, n)
	50	+	}
	51	+	})
	52	+	}
	53	+	}
	54	+
	55	+	func TestTranslateLegacy(t *testing.T) {
	56	+	tests := []struct {
	57	+	name string
	58	+	in string
	59	+	want string
	60	+	}{
	61	+	{name: "legacy passthrough", in: "hello\x1b[A\x1bj\r", want: "hello\x1b[A\x1bj\r"},
	62	+	{name: "escape", in: "\x1b[27u", want: "\x1b"},
	63	+	{name: "alt escape", in: "\x1b[27;3u", want: "\x1b\x1b"},
	64	+	{name: "enter", in: "\x1b[13u", want: "\r"},
	65	+	{name: "tab", in: "\x1b[9u", want: "\t"},
	66	+	{name: "shift tab", in: "\x1b[9;2u", want: "\x1b[Z"},
	67	+	{name: "backspace", in: "\x1b[127u", want: "\x7f"},
	68	+	{name: "ctrl backspace", in: "\x1b[127;5u", want: "\x08"},
	69	+	{name: "ctrl i", in: "\x1b[105;5u", want: "\t"},
	70	+	{name: "ctrl a", in: "\x1b[97;5u", want: "\x01"},
	71	+	{name: "ctrl alt a", in: "\x1b[97;7u", want: "\x1b\x01"},
	72	+	{name: "ctrl shift a", in: "\x1b[97:65;6u", want: "\x01"},
	73	+	{name: "ctrl space", in: "\x1b[32;5u", want: "\x00"},
	74	+	{name: "ctrl 1 has no control byte", in: "\x1b[49;5u", want: "1"},
	75	+	{name: "ctrl 3", in: "\x1b[51;5u", want: "\x1b"},
	76	+	{name: "azerty ctrl ampersand", in: "\x1b[38::49;5u", want: "&"},
	77	+	{name: "cyrillic ctrl uses base", in: "\x1b[1092::97;5u", want: "\x01"},
	78	+	{name: "shift letter with shifted", in: "\x1b[97:65;2u", want: "A"},
	79	+	{name: "shift letter without shifted", in: "\x1b[97;2u", want: "A"},
	80	+	{name: "alt utf8", in: "\x1b[233;3u", want: "\x1bé"},
	81	+	{name: "super dropped", in: "\x1b[97;9u", want: ""},
	82	+	{name: "release dropped", in: "\x1b[97;1:3u", want: ""},
	83	+	{name: "private use dropped", in: "\x1b[57441u", want: ""},
	84	+	{name: "keypad digit", in: "\x1b[57400u", want: "1"},
	85	+	{name: "keypad enter", in: "\x1b[57414u", want: "\r"},
	86	+	{name: "ctrl keypad left", in: "\x1b[57417;5u", want: "\x1b[1;5D"},
	87	+	{name: "ctrl keypad delete", in: "\x1b[57426;5u", want: "\x1b[3;5~"},
	88	+	{name: "keypad begin", in: "\x1b[57427u", want: "\x1b[E"},
	89	+	{name: "keypad separator", in: "\x1b[57416u", want: ","},
	90	+	{name: "f1 unmodified", in: "\x1b[P", want: "\x1bOP"},
	91	+	{name: "f2 modified kept", in: "\x1b[1;5Q", want: "\x1b[1;5Q"},
	92	+	{name: "mixed", in: "a\x1b[97;5ub\x1b[27uc", want: "a\x01b\x1bc"},
	93	+	{name: "truncated prefix untouched", in: "x\x1b[97;5", want: "x\x1b[97;5"},
	94	+	{name: "trailing garbage", in: "\x1b[97;5u\x1b[zz", want: "\x01\x1b[zz"},
	95	+	{name: "paste body untouched", in: "\x1b[200~\x1b[97;5u\x1b[201~\x1b[97;5u", want: "\x1b[200~\x1b[97;5u\x1b[201~\x01"},
	96	+	{name: "unterminated paste untouched", in: "\x1b[200~\x1b[97;5u", want: "\x1b[200~\x1b[97;5u"},
	97	+	{name: "mouse untouched", in: "\x1b[<0;1;1M", want: "\x1b[<0;1;1M"},
	98	+	{name: "keyboard reply untouched", in: "\x1b[?5u", want: "\x1b[?5u"},
	99	+	}
	100	+	for _, tt := range tests {
	101	+	t.Run(tt.name, func(t *testing.T) {
	102	+	require.Equal(t, []byte(tt.want), append([]byte{}, Translate([]byte(tt.in), 0)...))
	103	+	})
	104	+	}
	105	+	}
	106	+
	107	+	func TestTranslateKittyReceiver(t *testing.T) {
	108	+	tests := []struct {
	109	+	name string
	110	+	in string
	111	+	flags int
	112	+	want string
	113	+	}{
	114	+	{name: "same flags identity", in: "\x1b[38::49;5u", flags: OuterFlags, want: "\x1b[38::49;5u"},
	115	+	{name: "strip alternates", in: "\x1b[38::49;5u", flags: FlagDisambiguate, want: "\x1b[38;5u"},
	116	+	{name: "keep shifted", in: "\x1b[97:65;2u", flags: FlagDisambiguate \| FlagAlternateKeys, want: "\x1b[97:65;2u"},
	117	+	{name: "unmodified", in: "\x1b[27u", flags: FlagDisambiguate, want: "\x1b[27u"},
	118	+	{name: "release dropped without events", in: "\x1b[97;1:3u", flags: FlagDisambiguate, want: ""},
	119	+	{name: "release kept with events", in: "\x1b[97;1:3u", flags: FlagDisambiguate \| FlagReportEvents, want: "\x1b[97;1:3u"},
	120	+	{name: "f1 stays csi", in: "\x1b[P", flags: FlagDisambiguate, want: "\x1b[P"},
	121	+	}
	122	+	for _, tt := range tests {
	123	+	t.Run(tt.name, func(t *testing.T) {
	124	+	require.Equal(t, []byte(tt.want), append([]byte{}, Translate([]byte(tt.in), tt.flags)...))
	125	+	})
	126	+	}
	127	+	}
	128	+
	129	+	func TestTranslateReturnsInputWhenUnchanged(t *testing.T) {
	130	+	in := []byte("plain \x1b[A text")
	131	+	out := Translate(in, 0)
	132	+	require.Same(t, &in[0], &out[0])
	133	+	}
	134	+
	135	+	func TestEventDigit(t *testing.T) {
	136	+	tests := []struct {
	137	+	ev Event
	138	+	want int
	139	+	ok bool
	140	+	}{
	141	+	{ev: Event{Code: '1'}, want: 1, ok: true},
	142	+	{ev: Event{Code: '&', Base: '1'}, want: 1, ok: true},
	143	+	{ev: Event{Code: 'é', Base: '2'}, want: 2, ok: true},
	144	+	{ev: Event{Code: '0'}},
	145	+	{ev: Event{Code: 'a'}},
	146	+	}
	147	+	for _, tt := range tests {
	148	+	got, ok := tt.ev.Digit()
	149	+	require.Equal(t, tt.ok, ok, "%+v", tt.ev)
	150	+	require.Equal(t, tt.want, got)
	151	+	}
	152	+	}
	153	+
	154	+	func FuzzTranslate(f *testing.F) {
	155	+	for _, seed := range []string{"\x1b[97;5u", "\x1b[38::49;5u", "\x1b[200~x\x1b[201~", "\x1b[1;5P", "a\x1b["} {
	156	+	f.Add([]byte(seed), 0)
	157	+	f.Add([]byte(seed), OuterFlags)
	158	+	}
	159	+	f.Fuzz(func(t *testing.T, data []byte, flags int) {
	160	+	out := Translate(data, flags&0x1f)
	161	+	// Translation never grows input by more than a bounded factor.
	162	+	require.LessOrEqual(t, len(out), 2*len(data)+16)
	163	+	})
	164	+	}
	165	+
	166	+	func BenchmarkTranslateLegacyText(b *testing.B) {
	167	+	data := []byte("the quick brown fox jumps over the lazy dog\r")
	168	+	b.ReportAllocs()
	169	+	for b.Loop() {
	170	+	_ = Translate(data, 0)
	171	+	}
	172	+	}

M internal/usecase/keys/router.go +109 -106


@@ -3,14 +3,15 @@
3	3		package keys
4	4
5	5		import (
6		-	"bytes"
7	6		"slices"
8	7		"sync"
9	8		"sync/atomic"
10	9		"time"
	10	+	"unicode"
11	11		"unicode/utf8"
12	12
13	13		"github.com/bnema/vev/internal/ports"
	14	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
14	15		)
15	16
16	17		const (

@@ -45,6 +46,19 @@ const (
45	46		ActionEqualizePanes
46	47		ActionConsumeOrExpelPaneLeft
47	48		ActionConsumeOrExpelPaneRight
	49	+	// ActionSwitchRecent1..9 switch to the Nth previous session of the
	50	+	// client's recent history. They are fixed to Ctrl+1..9, which only a
	51	+	// terminal speaking the kitty keyboard protocol can send, and are not
	52	+	// rebindable.
	53	+	ActionSwitchRecent1
	54	+	ActionSwitchRecent2
	55	+	ActionSwitchRecent3
	56	+	ActionSwitchRecent4
	57	+	ActionSwitchRecent5
	58	+	ActionSwitchRecent6
	59	+	ActionSwitchRecent7
	60	+	ActionSwitchRecent8
	61	+	ActionSwitchRecent9
48	62		)
49	63
50	64		// Handler receives router outputs. Forward is called only for bytes that should

@@ -63,6 +77,10 @@ type Router struct {
63	77		delay time.Duration
64	78		h Handler
65	79		bindings *atomic.Pointer[Bindings]
	80	+	// kitty enables kitty keyboard protocol decoding. Only an attachment
	81	+	// whose client enabled the protocol on its outer terminal sets it, so
	82	+	// CSI u from any other source passes through untouched.
	83	+	kitty atomic.Bool
66	84
67	85		mu sync.Mutex
68	86		pending bool

@@ -129,79 +147,53 @@ func (r *Router) route(data []byte, h Handler) {
129	147		i++
130	148		continue
131	149		}
132		-	if i == len(data)-1 {
	150	+	tok := r.scan(data[i:])
	151	+	if tok.kind == escIncomplete {
133	152		flush()
134		-	r.retainESC(h)
	153	+	r.retainESC(h, tok.raw[1:])
135	154		return
136	155		}
137		-	remaining := data[i+1:]
138		-	if bytes.HasPrefix(data[i:], ports.BracketedPasteOpenMarker) {
139		-	// A bracketed paste whose closing marker is in this same frame is
140		-	// forwarded verbatim: pasted content bytes (including embedded
141		-	// ESC+letter Alt lookalikes or ESC [ 1 ; 3 A sequences) must never
142		-	// fire an Action mid-paste. Without a closing marker in-frame we
143		-	// fall through to today's per-byte routing (the '[' passes through
144		-	// as a control prefix); Part A keeps pastes single-frame in
145		-	// practice, so no cross-frame paste state is tracked here.
146		-	if rel := bytes.Index(data[i:], ports.BracketedPasteCloseMarker); rel >= 0 {
147		-	end := i + rel + len(ports.BracketedPasteCloseMarker)
148		-	buf = append(buf, data[i:end]...)
149		-	i = end
150		-	continue
151		-	}
152		-	}
153		-	if action, size, ok, partial := r.altArrowCSI(remaining); ok {
	156	+	if action, ok := r.tokenAction(tok); ok {
154	157		flush()
155		-	r.action(action, data[i:i+1+size], h)
156		-	i += 1 + size
	158	+	r.action(action, tok.raw, h)
	159	+	i += len(tok.raw)
157	160		continue
158		-	} else if partial {
159		-	flush()
160		-	r.retainESC(h, remaining)
161		-	return
162	161		}
163		-	next := data[i+1]
164		-	if passThroughPrefix(next) {
165		-	buf = append(buf, ESC, next)
166		-	i += 2
167		-	continue
168		-	}
169		-	if action, size, ok := r.binding(remaining); ok {
170		-	flush()
171		-	r.action(action, data[i:i+1+size], h)
172		-	i += 1 + size
173		-	continue
174		-	}
175		-	if partialUTF8Rune(remaining) {
176		-	flush()
177		-	r.retainESC(h, remaining)
178		-	return
	162	+	switch tok.kind {
	163	+	case escPaste, escAltArrow, escControlPrefix, escKittyKey:
	164	+	// Pastes are forwarded verbatim so embedded Alt lookalikes never
	165	+	// fire; unbound arrows and control prefixes pass through.
	166	+	buf = append(buf, tok.raw...)
	167	+	i += len(tok.raw)
	168	+	default:
	169	+	// Unbound Alt rune or bare ESC: forward the ESC alone and route
	170	+	// the following bytes normally.
	171	+	buf = append(buf, ESC)
	172	+	i++
179	173		}
180		-	buf = append(buf, ESC)
181		-	i++
182	174		}
183	175		flush()
184	176		}
185	177
	178	+	// routeAfterPendingESC routes data that follows a retained ESC. data excludes
	179	+	// that ESC; pendingAltLen bytes of data were retained with it. It returns how
	180	+	// many bytes of data it consumed.
186	181		func (r *Router) routeAfterPendingESC(data []byte, pendingAltLen int, h Handler) int {
187		-	if action, size, ok, partial := r.altArrowCSI(data); ok {
188		-	r.action(action, append([]byte{ESC}, data[:size]...), h)
189		-	return size
190		-	} else if partial {
	182	+	tok := r.scan(append([]byte{ESC}, data...))
	183	+	if tok.kind == escIncomplete {
191	184		r.retainESC(h, data)
192	185		return len(data)
193	186		}
194		-	next := data[0]
195		-	if action, size, ok := r.binding(data); ok {
196		-	r.action(action, append([]byte{ESC}, data[:size]...), h)
197		-	return size
	187	+	if action, ok := r.tokenAction(tok); ok {
	188	+	r.action(action, tok.raw, h)
	189	+	return len(tok.raw) - 1
198	190		}
199		-	if partialUTF8Rune(data) {
200		-	r.retainESC(h, data)
201		-	return len(data)
	191	+	if tok.kind == escKittyKey {
	192	+	// Forward the whole sequence so the handler can re-encode it.
	193	+	r.forward(tok.raw, h)
	194	+	return len(tok.raw) - 1
202	195		}
203		-	_, size := utf8.DecodeRune(data)
204		-	if size > 1 {
	196	+	if _, size := utf8.DecodeRune(data); size > 1 {
205	197		r.forward(append([]byte{ESC}, data[:size]...), h)
206	198		return size
207	199		}

@@ -209,7 +201,7 @@ func (r *Router) routeAfterPendingESC(data []byte, pendingAltLen int, h Handler)
209	201		r.forward(append([]byte{ESC}, data[:pendingAltLen]...), h)
210	202		return pendingAltLen
211	203		}
212		-	if passThroughPrefix(next) {
	204	+	if next := data[0]; next == '[' \|\| next == 'O' {
213	205		r.forward([]byte{ESC, next}, h)
214	206		return 1
215	207		}

@@ -217,6 +209,34 @@ func (r *Router) routeAfterPendingESC(data []byte, pendingAltLen int, h Handler)
217	209		return 0
218	210		}
219	211
	212	+	// SetKittyKeyboard enables or disables kitty keyboard protocol decoding.
	213	+	func (r *Router) SetKittyKeyboard(enabled bool) { r.kitty.Store(enabled) }
	214	+
	215	+	// KittyKeyboard reports whether kitty keyboard protocol decoding is enabled.
	216	+	// A nil Router reports false.
	217	+	func (r *Router) KittyKeyboard() bool { return r != nil && r.kitty.Load() }
	218	+
	219	+	// scan lexes one ESC-introduced unit, ignoring kitty key events unless the
	220	+	// attachment enabled the protocol.
	221	+	func (r *Router) scan(data []byte) escToken {
	222	+	return scanEscape(data, r.kitty.Load())
	223	+	}
	224	+
	225	+	// tokenAction resolves a lexed unit against the current bindings.
	226	+	func (r *Router) tokenAction(tok escToken) (Action, bool) {
	227	+	bindings := r.currentBindings()
	228	+	switch tok.kind {
	229	+	case escAltArrow:
	230	+	return bindings.actionForAltArrow(tok.arrow)
	231	+	case escAltRune:
	232	+	return bindings.actionForAltRune(tok.rune)
	233	+	case escKittyKey:
	234	+	return kittyKeyAction(bindings, tok.key)
	235	+	default:
	236	+	return 0, false
	237	+	}
	238	+	}
	239	+
220	240		func (r *Router) retainESC(h Handler, altBytes ...[]byte) {
221	241		r.mu.Lock()
222	242		r.pending = true

@@ -267,14 +287,6 @@ func (r *Router) stopTimer() {
267	287		}
268	288		}
269	289
270		-	func partialUTF8Rune(data []byte) bool {
271		-	if len(data) == 0 \|\| utf8.FullRune(data) {
272		-	return false
273		-	}
274		-	key, size := utf8.DecodeRune(data)
275		-	return key == utf8.RuneError && size == 1
276		-	}
277		-
278	290		func (r *Router) forward(data []byte, h Handler) {
279	291		cp := append([]byte(nil), data...)
280	292		h.Forward(cp)

@@ -285,8 +297,6 @@ func (r *Router) action(action Action, raw []byte, h Handler) {
285	297		h.Action(action, cp)
286	298		}
287	299
288		-	func passThroughPrefix(b byte) bool { return b == '[' \|\| b == 'O' }
289		-
290	300		func (r Router) currentBindings() Bindings {
291	301		if r.bindings == nil {
292	302		return defaultBindings

@@ -298,44 +308,6 @@ func (r Router) currentBindings() Bindings {
298	308		return bindings
299	309		}
300	310
301		-	func (r *Router) altArrowCSI(data []byte) (Action, int, bool, bool) {
302		-	const seqLen = len("[1;3A")
303		-	if len(data) < seqLen {
304		-	return 0, 0, false, hasAltArrowCSIPrefix(data)
305		-	}
306		-	seq := data[:seqLen]
307		-	if seq[0] != '[' \|\| seq[1] != '1' \|\| seq[2] != ';' \|\| (seq[3] != '3' && seq[3] != '9') {
308		-	return 0, 0, false, false
309		-	}
310		-	if action, ok := r.currentBindings().actionForAltArrow(seq[4]); ok {
311		-	return action, seqLen, true, false
312		-	}
313		-	return 0, 0, false, false
314		-	}
315		-
316		-	func hasAltArrowCSIPrefix(data []byte) bool {
317		-	if len(data) == 0 \|\| len(data) >= len("[1;3A") {
318		-	return false
319		-	}
320		-	return matchesPrefix(data, "[1;3") \|\| matchesPrefix(data, "[1;9")
321		-	}
322		-
323		-	func matchesPrefix(data []byte, want string) bool {
324		-	if len(data) > len(want) {
325		-	return false
326		-	}
327		-	for i := range data {
328		-	if data[i] != want[i] {
329		-	return false
330		-	}
331		-	}
332		-	return true
333		-	}
334		-
335		-	func (r *Router) binding(data []byte) (Action, int, bool) {
336		-	return r.currentBindings().actionForAltBytes(data)
337		-	}
338		-
339	311		var topRowDigitAliases = [][]rune{
340	312		{'1', '&'},
341	313		{'2', 'é'},

@@ -359,3 +331,34 @@ func topRowDigitIndex(key rune) (int, bool) {
359	331		}
360	332		return 0, false
361	333		}
	334	+
	335	+	// kittyKeyAction resolves a kitty keyboard protocol key event. Alt+key uses
	336	+	// the configured Alt bindings; Ctrl+1..9 is the fixed recent-session switch.
	337	+	// The PC-101 base key lets layouts such as AZERTY match digit bindings.
	338	+	func kittyKeyAction(bindings *Bindings, ev kittykey.Event) (Action, bool) {
	339	+	if ev.Release {
	340	+	return 0, false
	341	+	}
	342	+	switch ev.Mods {
	343	+	case kittykey.ModAlt:
	344	+	if action, ok := bindings.actionForAltRune(ev.Code); ok {
	345	+	return action, true
	346	+	}
	347	+	if ev.Base != 0 {
	348	+	return bindings.actionForAltRune(ev.Base)
	349	+	}
	350	+	case kittykey.ModAlt \| kittykey.ModShift:
	351	+	// Legacy terminals send Alt+Shift+key as ESC plus the shifted rune,
	352	+	// which is what alt+<shifted char> bindings match.
	353	+	shifted := ev.Shifted
	354	+	if shifted == 0 {
	355	+	shifted = unicode.ToUpper(ev.Code)
	356	+	}
	357	+	return bindings.actionForAltRune(shifted)
	358	+	case kittykey.ModCtrl:
	359	+	if digit, ok := ev.Digit(); ok {
	360	+	return ActionSwitchRecent1 + Action(digit-1), true
	361	+	}
	362	+	}
	363	+	return 0, false
	364	+	}

 package keys
 import (
-	"bytes"
 	"slices"
 	"sync"
 	"sync/atomic"
 	"time"
+	"unicode"
 	"unicode/utf8"
 	"github.com/bnema/vev/internal/ports"
+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
 )
 const (
 	ActionEqualizePanes
 	ActionConsumeOrExpelPaneLeft
 	ActionConsumeOrExpelPaneRight
+	// ActionSwitchRecent1..9 switch to the Nth previous session of the
+	// client's recent history. They are fixed to Ctrl+1..9, which only a
+	// terminal speaking the kitty keyboard protocol can send, and are not
+	// rebindable.
+	ActionSwitchRecent1
+	ActionSwitchRecent2
+	ActionSwitchRecent3
+	ActionSwitchRecent4
+	ActionSwitchRecent5
+	ActionSwitchRecent6
+	ActionSwitchRecent7
+	ActionSwitchRecent8
+	ActionSwitchRecent9
 )
 // Handler receives router outputs. Forward is called only for bytes that should
 	delay    time.Duration
 	h        Handler
 	bindings *atomic.Pointer[Bindings]
+	// kitty enables kitty keyboard protocol decoding. Only an attachment
+	// whose client enabled the protocol on its outer terminal sets it, so
+	// CSI u from any other source passes through untouched.
+	kitty atomic.Bool
 	mu             sync.Mutex
 	pending        bool
 			i++
 			continue
 		}
-		if i == len(data)-1 {
+		tok := r.scan(data[i:])
+		if tok.kind == escIncomplete {
 			flush()
-			r.retainESC(h)
+			r.retainESC(h, tok.raw[1:])
 			return
 		}
-		remaining := data[i+1:]
+		if action, ok := r.tokenAction(tok); ok {
-		if bytes.HasPrefix(data[i:], ports.BracketedPasteOpenMarker) {
-			// A bracketed paste whose closing marker is in this same frame is
-			// forwarded verbatim: pasted content bytes (including embedded
-			// ESC+letter Alt lookalikes or ESC [ 1 ; 3 A sequences) must never
-			// fire an Action mid-paste. Without a closing marker in-frame we
-			// fall through to today's per-byte routing (the '[' passes through
-			// as a control prefix); Part A keeps pastes single-frame in
-			// practice, so no cross-frame paste state is tracked here.
-			if rel := bytes.Index(data[i:], ports.BracketedPasteCloseMarker); rel >= 0 {
-				end := i + rel + len(ports.BracketedPasteCloseMarker)
-				buf = append(buf, data[i:end]...)
-				i = end
-				continue
-			}
-		}
-		if action, size, ok, partial := r.altArrowCSI(remaining); ok {
 			flush()
-			r.action(action, data[i:i+1+size], h)
+			r.action(action, tok.raw, h)
-			i += 1 + size
+			i += len(tok.raw)
 			continue
-		} else if partial {
-			flush()
-			r.retainESC(h, remaining)
-			return
 		}
-		next := data[i+1]
+		switch tok.kind {
-		if passThroughPrefix(next) {
+		case escPaste, escAltArrow, escControlPrefix, escKittyKey:
-			buf = append(buf, ESC, next)
+			// Pastes are forwarded verbatim so embedded Alt lookalikes never
-			i += 2
+			// fire; unbound arrows and control prefixes pass through.
-			continue
+			buf = append(buf, tok.raw...)
-		}
+			i += len(tok.raw)
-		if action, size, ok := r.binding(remaining); ok {
+		default:
-			flush()
+			// Unbound Alt rune or bare ESC: forward the ESC alone and route
-			r.action(action, data[i:i+1+size], h)
+			// the following bytes normally.
-			i += 1 + size
+			buf = append(buf, ESC)
-			continue
+			i++
-		}
-		if partialUTF8Rune(remaining) {
-			flush()
-			r.retainESC(h, remaining)
-			return
 		}
-		buf = append(buf, ESC)
-		i++
 	}
 	flush()
 }
+// routeAfterPendingESC routes data that follows a retained ESC. data excludes
+// that ESC; pendingAltLen bytes of data were retained with it. It returns how
+// many bytes of data it consumed.
 func (r *Router) routeAfterPendingESC(data []byte, pendingAltLen int, h Handler) int {
-	if action, size, ok, partial := r.altArrowCSI(data); ok {
+	tok := r.scan(append([]byte{ESC}, data...))
-		r.action(action, append([]byte{ESC}, data[:size]...), h)
+	if tok.kind == escIncomplete {
-		return size
-	} else if partial {
 		r.retainESC(h, data)
 		return len(data)
 	}
-	next := data[0]
+	if action, ok := r.tokenAction(tok); ok {
-	if action, size, ok := r.binding(data); ok {
+		r.action(action, tok.raw, h)
-		r.action(action, append([]byte{ESC}, data[:size]...), h)
+		return len(tok.raw) - 1
-		return size
 	}
-	if partialUTF8Rune(data) {
+	if tok.kind == escKittyKey {
-		r.retainESC(h, data)
+		// Forward the whole sequence so the handler can re-encode it.
-		return len(data)
+		r.forward(tok.raw, h)
+		return len(tok.raw) - 1
 	}
-	_, size := utf8.DecodeRune(data)
+	if _, size := utf8.DecodeRune(data); size > 1 {
-	if size > 1 {
 		r.forward(append([]byte{ESC}, data[:size]...), h)
 		return size
 	}
 		r.forward(append([]byte{ESC}, data[:pendingAltLen]...), h)
 		return pendingAltLen
 	}
-	if passThroughPrefix(next) {
+	if next := data[0]; next == '[' || next == 'O' {
 		r.forward([]byte{ESC, next}, h)
 		return 1
 	}
 	return 0
 }
+// SetKittyKeyboard enables or disables kitty keyboard protocol decoding.
+func (r *Router) SetKittyKeyboard(enabled bool) { r.kitty.Store(enabled) }
+// KittyKeyboard reports whether kitty keyboard protocol decoding is enabled.
+// A nil Router reports false.
+func (r *Router) KittyKeyboard() bool { return r != nil && r.kitty.Load() }
+// scan lexes one ESC-introduced unit, ignoring kitty key events unless the
+// attachment enabled the protocol.
+func (r *Router) scan(data []byte) escToken {
+	return scanEscape(data, r.kitty.Load())
+}
+// tokenAction resolves a lexed unit against the current bindings.
+func (r *Router) tokenAction(tok escToken) (Action, bool) {
+	bindings := r.currentBindings()
+	switch tok.kind {
+	case escAltArrow:
+		return bindings.actionForAltArrow(tok.arrow)
+	case escAltRune:
+		return bindings.actionForAltRune(tok.rune)
+	case escKittyKey:
+		return kittyKeyAction(bindings, tok.key)
+	default:
+		return 0, false
+	}
+}
 func (r *Router) retainESC(h Handler, altBytes ...[]byte) {
 	r.mu.Lock()
 	r.pending = true
 	}
 }
-func partialUTF8Rune(data []byte) bool {
-	if len(data) == 0 || utf8.FullRune(data) {
-		return false
-	}
-	key, size := utf8.DecodeRune(data)
-	return key == utf8.RuneError && size == 1
-}
 func (r *Router) forward(data []byte, h Handler) {
 	cp := append([]byte(nil), data...)
 	h.Forward(cp)
 	h.Action(action, cp)
 }
-func passThroughPrefix(b byte) bool { return b == '[' || b == 'O' }
 func (r *Router) currentBindings() *Bindings {
 	if r.bindings == nil {
 		return defaultBindings
 	return bindings
 }
-func (r *Router) altArrowCSI(data []byte) (Action, int, bool, bool) {
-	const seqLen = len("[1;3A")
-	if len(data) < seqLen {
-		return 0, 0, false, hasAltArrowCSIPrefix(data)
-	}
-	seq := data[:seqLen]
-	if seq[0] != '[' || seq[1] != '1' || seq[2] != ';' || (seq[3] != '3' && seq[3] != '9') {
-		return 0, 0, false, false
-	}
-	if action, ok := r.currentBindings().actionForAltArrow(seq[4]); ok {
-		return action, seqLen, true, false
-	}
-	return 0, 0, false, false
-}
-func hasAltArrowCSIPrefix(data []byte) bool {
-	if len(data) == 0 || len(data) >= len("[1;3A") {
-		return false
-	}
-	return matchesPrefix(data, "[1;3") || matchesPrefix(data, "[1;9")
-}
-func matchesPrefix(data []byte, want string) bool {
-	if len(data) > len(want) {
-		return false
-	}
-	for i := range data {
-		if data[i] != want[i] {
-			return false
-		}
-	}
-	return true
-}
-func (r *Router) binding(data []byte) (Action, int, bool) {
-	return r.currentBindings().actionForAltBytes(data)
-}
 var topRowDigitAliases = [][]rune{
 	{'1', '&'},
 	{'2', 'é'},
 	}
 	return 0, false
 }
+// kittyKeyAction resolves a kitty keyboard protocol key event. Alt+key uses
+// the configured Alt bindings; Ctrl+1..9 is the fixed recent-session switch.
+// The PC-101 base key lets layouts such as AZERTY match digit bindings.
+func kittyKeyAction(bindings *Bindings, ev kittykey.Event) (Action, bool) {
+	if ev.Release {
+		return 0, false
+	}
+	switch ev.Mods {
+	case kittykey.ModAlt:
+		if action, ok := bindings.actionForAltRune(ev.Code); ok {
+			return action, true
+		}
+		if ev.Base != 0 {
+			return bindings.actionForAltRune(ev.Base)
+		}
+	case kittykey.ModAlt | kittykey.ModShift:
+		// Legacy terminals send Alt+Shift+key as ESC plus the shifted rune,
+		// which is what alt+<shifted char> bindings match.
+		shifted := ev.Shifted
+		if shifted == 0 {
+			shifted = unicode.ToUpper(ev.Code)
+		}
+		return bindings.actionForAltRune(shifted)
+	case kittykey.ModCtrl:
+		if digit, ok := ev.Digit(); ok {
+			return ActionSwitchRecent1 + Action(digit-1), true
+		}
+	}
+	return 0, false
+}

M internal/usecase/keys/router_test.go +81 -0


@@ -623,3 +623,84 @@ func TestRouterPasteMarkerSplitAcrossFramesKeepsCurrentBehavior(t *testing.T) {
623	623		require.Empty(t, h.actions)
624	624		require.Equal(t, [][]byte{[]byte("\x1b[200~hello"), []byte("\x1b[201~")}, h.forwards)
625	625		}
	626	+
	627	+	func TestRouterKittyKeyboardEvents(t *testing.T) {
	628	+	tests := []struct {
	629	+	name string
	630	+	reads []string
	631	+	wantActions []Action
	632	+	wantForwards []string
	633	+	}{
	634	+	{name: "ctrl 1", reads: []string{"\x1b[49;5u"}, wantActions: []Action{ActionSwitchRecent1}},
	635	+	{name: "ctrl 9", reads: []string{"\x1b[57;5u"}, wantActions: []Action{ActionSwitchRecent9}},
	636	+	{name: "azerty ctrl 2 base key", reads: []string{"\x1b[233::50;5u"}, wantActions: []Action{ActionSwitchRecent2}},
	637	+	{name: "ctrl 0 forwarded", reads: []string{"\x1b[48;5u"}, wantForwards: []string{"\x1b[48;5u"}},
	638	+	{name: "ctrl shift 1 forwarded", reads: []string{"\x1b[49;6u"}, wantForwards: []string{"\x1b[49;6u"}},
	639	+	{name: "ctrl 1 release ignored", reads: []string{"\x1b[49;5:3u"}, wantForwards: []string{"\x1b[49;5:3u"}},
	640	+	{name: "alt j binding", reads: []string{"\x1b[106;3u"}, wantActions: []Action{ActionFocusPaneDown}},
	641	+	{name: "alt space binding", reads: []string{"\x1b[32;3u"}, wantActions: []Action{ActionOpenPalette}},
	642	+	{name: "alt azerty 1 via symbol", reads: []string{"\x1b[38::49;3u"}, wantActions: []Action{ActionSwitchTab1}},
	643	+	{name: "alt unbound forwarded", reads: []string{"\x1b[122;3u"}, wantForwards: []string{"\x1b[122;3u"}},
	644	+	{name: "ctrl a forwarded", reads: []string{"\x1b[97;5u"}, wantForwards: []string{"\x1b[97;5u"}},
	645	+	{name: "text around", reads: []string{"ab\x1b[49;5ucd"}, wantActions: []Action{ActionSwitchRecent1}, wantForwards: []string{"ab", "cd"}},
	646	+	{name: "split across reads", reads: []string{"\x1b[49", ";5u"}, wantActions: []Action{ActionSwitchRecent1}},
	647	+	{name: "split after esc", reads: []string{"\x1b", "[49;5u"}, wantActions: []Action{ActionSwitchRecent1}},
	648	+	{name: "unbound split after esc stays whole", reads: []string{"\x1b", "[97;5u"}, wantForwards: []string{"\x1b[97;5u"}},
	649	+	{name: "unbound split mid sequence stays whole", reads: []string{"\x1b[97", ";5ux"}, wantForwards: []string{"\x1b[97;5u", "x"}},
	650	+	{name: "alt shift h uses shifted key", reads: []string{"\x1b[104:72;4u"}, wantForwards: []string{"\x1b[104:72;4u"}},
	651	+	{name: "inside paste untouched", reads: []string{"\x1b[200~\x1b[49;5u\x1b[201~"}, wantForwards: []string{"\x1b[200~\x1b[49;5u\x1b[201~"}},
	652	+	}
	653	+	for _, tt := range tests {
	654	+	t.Run(tt.name, func(t *testing.T) {
	655	+	clk := &fakeClock{}
	656	+	h := &captureHandler{}
	657	+	r := NewRouter(clk, h, nil)
	658	+	r.SetKittyKeyboard(true)
	659	+	for _, read := range tt.reads {
	660	+	r.Route([]byte(read))
	661	+	}
	662	+	require.Equal(t, tt.wantActions, h.actions)
	663	+	var forwards []string
	664	+	for _, f := range h.forwards {
	665	+	forwards = append(forwards, string(f))
	666	+	}
	667	+	require.Equal(t, tt.wantForwards, forwards)
	668	+	assertRouterPendingCleared(t, r)
	669	+	})
	670	+	}
	671	+	}
	672	+
	673	+	func TestRouterKittyKeyboardAltShiftBindings(t *testing.T) {
	674	+	custom := DefaultBindings().clone()
	675	+	custom.bind(ActionConsumeOrExpelPaneLeft, KeySpec{altRunes: []rune{'H'}})
	676	+	custom.bind(ActionEqualizePanes, KeySpec{altRunes: []rune{'?'}})
	677	+	var bindings atomic.Pointer[Bindings]
	678	+	bindings.Store(custom)
	679	+	tests := []struct {
	680	+	name string
	681	+	in string
	682	+	want Action
	683	+	}{
	684	+	{name: "alt shift h with shifted key", in: "\x1b[104:72;4u", want: ActionConsumeOrExpelPaneLeft},
	685	+	{name: "alt shift h without shifted key", in: "\x1b[104;4u", want: ActionConsumeOrExpelPaneLeft},
	686	+	{name: "alt shift slash", in: "\x1b[47:63;4u", want: ActionEqualizePanes},
	687	+	}
	688	+	for _, tt := range tests {
	689	+	t.Run(tt.name, func(t *testing.T) {
	690	+	h := &captureHandler{}
	691	+	r := NewRouter(&fakeClock{}, h, &bindings)
	692	+	r.SetKittyKeyboard(true)
	693	+	r.Route([]byte(tt.in))
	694	+	require.Equal(t, []Action{tt.want}, h.actions)
	695	+	require.Empty(t, h.forwards)
	696	+	})
	697	+	}
	698	+	}
	699	+
	700	+	func TestRouterIgnoresKittyKeysUnlessEnabled(t *testing.T) {
	701	+	h := &captureHandler{}
	702	+	r := NewRouter(&fakeClock{}, h, nil)
	703	+	r.Route([]byte("\x1b[49;5u"))
	704	+	require.Empty(t, h.actions)
	705	+	require.Equal(t, [][]byte{[]byte("\x1b[49;5u")}, h.forwards)
	706	+	}


@@ -623,3 +623,84 @@ func TestRouterPasteMarkerSplitAcrossFramesKeepsCurrentBehavior(t *testing.T) {
623	require.Empty(t, h.actions)	623		require.Empty(t, h.actions)
624	require.Equal(t, [][]byte{[]byte("\x1b[200~hello"), []byte("\x1b[201~")}, h.forwards)	624		require.Equal(t, [][]byte{[]byte("\x1b[200~hello"), []byte("\x1b[201~")}, h.forwards)
625	}	625		}
		626	+
		627	+	func TestRouterKittyKeyboardEvents(t *testing.T) {
		628	+	tests := []struct {
		629	+	name string
		630	+	reads []string
		631	+	wantActions []Action
		632	+	wantForwards []string
		633	+	}{
		634	+	{name: "ctrl 1", reads: []string{"\x1b[49;5u"}, wantActions: []Action{ActionSwitchRecent1}},
		635	+	{name: "ctrl 9", reads: []string{"\x1b[57;5u"}, wantActions: []Action{ActionSwitchRecent9}},
		636	+	{name: "azerty ctrl 2 base key", reads: []string{"\x1b[233::50;5u"}, wantActions: []Action{ActionSwitchRecent2}},
		637	+	{name: "ctrl 0 forwarded", reads: []string{"\x1b[48;5u"}, wantForwards: []string{"\x1b[48;5u"}},
		638	+	{name: "ctrl shift 1 forwarded", reads: []string{"\x1b[49;6u"}, wantForwards: []string{"\x1b[49;6u"}},
		639	+	{name: "ctrl 1 release ignored", reads: []string{"\x1b[49;5:3u"}, wantForwards: []string{"\x1b[49;5:3u"}},
		640	+	{name: "alt j binding", reads: []string{"\x1b[106;3u"}, wantActions: []Action{ActionFocusPaneDown}},
		641	+	{name: "alt space binding", reads: []string{"\x1b[32;3u"}, wantActions: []Action{ActionOpenPalette}},
		642	+	{name: "alt azerty 1 via symbol", reads: []string{"\x1b[38::49;3u"}, wantActions: []Action{ActionSwitchTab1}},
		643	+	{name: "alt unbound forwarded", reads: []string{"\x1b[122;3u"}, wantForwards: []string{"\x1b[122;3u"}},
		644	+	{name: "ctrl a forwarded", reads: []string{"\x1b[97;5u"}, wantForwards: []string{"\x1b[97;5u"}},
		645	+	{name: "text around", reads: []string{"ab\x1b[49;5ucd"}, wantActions: []Action{ActionSwitchRecent1}, wantForwards: []string{"ab", "cd"}},
		646	+	{name: "split across reads", reads: []string{"\x1b[49", ";5u"}, wantActions: []Action{ActionSwitchRecent1}},
		647	+	{name: "split after esc", reads: []string{"\x1b", "[49;5u"}, wantActions: []Action{ActionSwitchRecent1}},
		648	+	{name: "unbound split after esc stays whole", reads: []string{"\x1b", "[97;5u"}, wantForwards: []string{"\x1b[97;5u"}},
		649	+	{name: "unbound split mid sequence stays whole", reads: []string{"\x1b[97", ";5ux"}, wantForwards: []string{"\x1b[97;5u", "x"}},
		650	+	{name: "alt shift h uses shifted key", reads: []string{"\x1b[104:72;4u"}, wantForwards: []string{"\x1b[104:72;4u"}},
		651	+	{name: "inside paste untouched", reads: []string{"\x1b[200~\x1b[49;5u\x1b[201~"}, wantForwards: []string{"\x1b[200~\x1b[49;5u\x1b[201~"}},
		652	+	}
		653	+	for _, tt := range tests {
		654	+	t.Run(tt.name, func(t *testing.T) {
		655	+	clk := &fakeClock{}
		656	+	h := &captureHandler{}
		657	+	r := NewRouter(clk, h, nil)
		658	+	r.SetKittyKeyboard(true)
		659	+	for _, read := range tt.reads {
		660	+	r.Route([]byte(read))
		661	+	}
		662	+	require.Equal(t, tt.wantActions, h.actions)
		663	+	var forwards []string
		664	+	for _, f := range h.forwards {
		665	+	forwards = append(forwards, string(f))
		666	+	}
		667	+	require.Equal(t, tt.wantForwards, forwards)
		668	+	assertRouterPendingCleared(t, r)
		669	+	})
		670	+	}
		671	+	}
		672	+
		673	+	func TestRouterKittyKeyboardAltShiftBindings(t *testing.T) {
		674	+	custom := DefaultBindings().clone()
		675	+	custom.bind(ActionConsumeOrExpelPaneLeft, KeySpec{altRunes: []rune{'H'}})
		676	+	custom.bind(ActionEqualizePanes, KeySpec{altRunes: []rune{'?'}})
		677	+	var bindings atomic.Pointer[Bindings]
		678	+	bindings.Store(custom)
		679	+	tests := []struct {
		680	+	name string
		681	+	in string
		682	+	want Action
		683	+	}{
		684	+	{name: "alt shift h with shifted key", in: "\x1b[104:72;4u", want: ActionConsumeOrExpelPaneLeft},
		685	+	{name: "alt shift h without shifted key", in: "\x1b[104;4u", want: ActionConsumeOrExpelPaneLeft},
		686	+	{name: "alt shift slash", in: "\x1b[47:63;4u", want: ActionEqualizePanes},
		687	+	}
		688	+	for _, tt := range tests {
		689	+	t.Run(tt.name, func(t *testing.T) {
		690	+	h := &captureHandler{}
		691	+	r := NewRouter(&fakeClock{}, h, &bindings)
		692	+	r.SetKittyKeyboard(true)
		693	+	r.Route([]byte(tt.in))
		694	+	require.Equal(t, []Action{tt.want}, h.actions)
		695	+	require.Empty(t, h.forwards)
		696	+	})
		697	+	}
		698	+	}
		699	+
		700	+	func TestRouterIgnoresKittyKeysUnlessEnabled(t *testing.T) {
		701	+	h := &captureHandler{}
		702	+	r := NewRouter(&fakeClock{}, h, nil)
		703	+	r.Route([]byte("\x1b[49;5u"))
		704	+	require.Empty(t, h.actions)
		705	+	require.Equal(t, [][]byte{[]byte("\x1b[49;5u")}, h.forwards)
		706	+	}

A internal/usecase/keys/tokenizer.go +121 -0

@@ -0,0 +1,121 @@
	1	+	package keys
	2	+
	3	+	import (
	4	+	"bytes"
	5	+	"unicode/utf8"
	6	+
	7	+	"github.com/bnema/vev/internal/ports"
	8	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
	9	+	)
	10	+
	11	+	// escKind classifies the input introduced by one ESC byte.
	12	+	type escKind uint8
	13	+
	14	+	const (
	15	+	// escIncomplete means more bytes are needed before the ESC can be
	16	+	// classified: a lone trailing ESC, a partial Alt-arrow CSI, or a partial
	17	+	// UTF-8 rune after ESC.
	18	+	escIncomplete escKind = iota
	19	+	// escPaste is a complete bracketed paste, open marker through close marker.
	20	+	escPaste
	21	+	// escAltArrow is a complete ESC [ 1 ; 3\|9 <A-D> sequence.
	22	+	escAltArrow
	23	+	// escControlPrefix is ESC [ or ESC O, the start of a terminal control
	24	+	// sequence that passes through untouched.
	25	+	escControlPrefix
	26	+	// escAltRune is ESC followed by one complete, valid UTF-8 rune.
	27	+	escAltRune
	28	+	// escKittyKey is a complete kitty keyboard protocol CSI u key event.
	29	+	escKittyKey
	30	+	// escBare is an ESC that starts none of the above.
	31	+	escBare
	32	+	)
	33	+
	34	+	// escToken is one lexed ESC-introduced unit. raw always starts with ESC and
	35	+	// aliases the scanned input.
	36	+	type escToken struct {
	37	+	kind escKind
	38	+	raw []byte
	39	+	rune rune // escAltRune and escControlPrefix: the rune after ESC
	40	+	arrow byte // escAltArrow: the final byte, one of 'A'..'D'
	41	+	key kittykey.Event
	42	+	}
	43	+
	44	+	const altArrowLen = len("\x1b[1;3A")
	45	+
	46	+	// scanEscape lexes the unit starting at data[0], which must be ESC. It only
	47	+	// classifies bytes; binding lookups and forwarding decisions belong to Router.
	48	+	func scanEscape(data []byte, kitty bool) escToken {
	49	+	if len(data) == 1 {
	50	+	return escToken{kind: escIncomplete, raw: data}
	51	+	}
	52	+	if bytes.HasPrefix(data, ports.BracketedPasteOpenMarker) {
	53	+	if rel := bytes.Index(data, ports.BracketedPasteCloseMarker); rel >= 0 {
	54	+	return escToken{kind: escPaste, raw: data[:rel+len(ports.BracketedPasteCloseMarker)]}
	55	+	}
	56	+	}
	57	+	if final, ok := altArrowFinal(data); ok {
	58	+	return escToken{kind: escAltArrow, raw: data[:altArrowLen], arrow: final}
	59	+	}
	60	+	if isAltArrowPrefix(data) {
	61	+	return escToken{kind: escIncomplete, raw: data}
	62	+	}
	63	+	if kitty {
	64	+	if ev, n, ok, partial := kittykey.Parse(data); ok {
	65	+	return escToken{kind: escKittyKey, raw: data[:n], key: ev}
	66	+	} else if partial {
	67	+	return escToken{kind: escIncomplete, raw: data}
	68	+	}
	69	+	}
	70	+	next := data[1]
	71	+	if next == '[' \|\| next == 'O' {
	72	+	return escToken{kind: escControlPrefix, raw: data[:2], rune: rune(next)}
	73	+	}
	74	+	rest := data[1:]
	75	+	if partialUTF8Rune(rest) {
	76	+	return escToken{kind: escIncomplete, raw: data}
	77	+	}
	78	+	if key, size := utf8.DecodeRune(rest); key != utf8.RuneError \|\| size > 1 {
	79	+	return escToken{kind: escAltRune, raw: data[:1+size], rune: key}
	80	+	}
	81	+	return escToken{kind: escBare, raw: data[:1]}
	82	+	}
	83	+
	84	+	// altArrowFinal reports the arrow final byte of a complete Alt (;3) or Meta
	85	+	// (;9) modified arrow CSI at the start of data.
	86	+	func altArrowFinal(data []byte) (byte, bool) {
	87	+	if len(data) < altArrowLen {
	88	+	return 0, false
	89	+	}
	90	+	seq := data[:altArrowLen]
	91	+	if seq[1] != '[' \|\| seq[2] != '1' \|\| seq[3] != ';' \|\| (seq[4] != '3' && seq[4] != '9') {
	92	+	return 0, false
	93	+	}
	94	+	switch final := seq[5]; final {
	95	+	case 'A', 'B', 'C', 'D':
	96	+	return final, true
	97	+	default:
	98	+	return 0, false
	99	+	}
	100	+	}
	101	+
	102	+	// isAltArrowPrefix reports whether data is a strict prefix of an Alt/Meta
	103	+	// arrow CSI, meaning the next read may still complete it.
	104	+	func isAltArrowPrefix(data []byte) bool {
	105	+	if len(data) < 2 \|\| len(data) >= altArrowLen {
	106	+	return false
	107	+	}
	108	+	return matchesPrefix(data, "\x1b[1;3") \|\| matchesPrefix(data, "\x1b[1;9")
	109	+	}
	110	+
	111	+	func matchesPrefix(data []byte, want string) bool {
	112	+	return len(data) <= len(want) && string(data) == want[:len(data)]
	113	+	}
	114	+
	115	+	func partialUTF8Rune(data []byte) bool {
	116	+	if len(data) == 0 \|\| utf8.FullRune(data) {
	117	+	return false
	118	+	}
	119	+	key, size := utf8.DecodeRune(data)
	120	+	return key == utf8.RuneError && size == 1
	121	+	}

@@ -0,0 +1,121 @@
	1	+	package keys
	2	+
	3	+	import (
	4	+	"bytes"
	5	+	"unicode/utf8"
	6	+
	7	+	"github.com/bnema/vev/internal/ports"
	8	+	"github.com/bnema/vev/internal/usecase/keys/kittykey"
	9	+	)
	10	+
	11	+	// escKind classifies the input introduced by one ESC byte.
	12	+	type escKind uint8
	13	+
	14	+	const (
	15	+	// escIncomplete means more bytes are needed before the ESC can be
	16	+	// classified: a lone trailing ESC, a partial Alt-arrow CSI, or a partial
	17	+	// UTF-8 rune after ESC.
	18	+	escIncomplete escKind = iota
	19	+	// escPaste is a complete bracketed paste, open marker through close marker.
	20	+	escPaste
	21	+	// escAltArrow is a complete ESC [ 1 ; 3\|9 <A-D> sequence.
	22	+	escAltArrow
	23	+	// escControlPrefix is ESC [ or ESC O, the start of a terminal control
	24	+	// sequence that passes through untouched.
	25	+	escControlPrefix
	26	+	// escAltRune is ESC followed by one complete, valid UTF-8 rune.
	27	+	escAltRune
	28	+	// escKittyKey is a complete kitty keyboard protocol CSI u key event.
	29	+	escKittyKey
	30	+	// escBare is an ESC that starts none of the above.
	31	+	escBare
	32	+	)
	33	+
	34	+	// escToken is one lexed ESC-introduced unit. raw always starts with ESC and
	35	+	// aliases the scanned input.
	36	+	type escToken struct {
	37	+	kind escKind
	38	+	raw []byte
	39	+	rune rune // escAltRune and escControlPrefix: the rune after ESC
	40	+	arrow byte // escAltArrow: the final byte, one of 'A'..'D'
	41	+	key kittykey.Event
	42	+	}
	43	+
	44	+	const altArrowLen = len("\x1b[1;3A")
	45	+
	46	+	// scanEscape lexes the unit starting at data[0], which must be ESC. It only
	47	+	// classifies bytes; binding lookups and forwarding decisions belong to Router.
	48	+	func scanEscape(data []byte, kitty bool) escToken {
	49	+	if len(data) == 1 {
	50	+	return escToken{kind: escIncomplete, raw: data}
	51	+	}
	52	+	if bytes.HasPrefix(data, ports.BracketedPasteOpenMarker) {
	53	+	if rel := bytes.Index(data, ports.BracketedPasteCloseMarker); rel >= 0 {
	54	+	return escToken{kind: escPaste, raw: data[:rel+len(ports.BracketedPasteCloseMarker)]}
	55	+	}
	56	+	}
	57	+	if final, ok := altArrowFinal(data); ok {
	58	+	return escToken{kind: escAltArrow, raw: data[:altArrowLen], arrow: final}
	59	+	}
	60	+	if isAltArrowPrefix(data) {
	61	+	return escToken{kind: escIncomplete, raw: data}
	62	+	}
	63	+	if kitty {
	64	+	if ev, n, ok, partial := kittykey.Parse(data); ok {
	65	+	return escToken{kind: escKittyKey, raw: data[:n], key: ev}
	66	+	} else if partial {
	67	+	return escToken{kind: escIncomplete, raw: data}
	68	+	}
	69	+	}
	70	+	next := data[1]
	71	+	if next == '[' \|\| next == 'O' {
	72	+	return escToken{kind: escControlPrefix, raw: data[:2], rune: rune(next)}
	73	+	}
	74	+	rest := data[1:]
	75	+	if partialUTF8Rune(rest) {
	76	+	return escToken{kind: escIncomplete, raw: data}
	77	+	}
	78	+	if key, size := utf8.DecodeRune(rest); key != utf8.RuneError \|\| size > 1 {
	79	+	return escToken{kind: escAltRune, raw: data[:1+size], rune: key}
	80	+	}
	81	+	return escToken{kind: escBare, raw: data[:1]}
	82	+	}
	83	+
	84	+	// altArrowFinal reports the arrow final byte of a complete Alt (;3) or Meta
	85	+	// (;9) modified arrow CSI at the start of data.
	86	+	func altArrowFinal(data []byte) (byte, bool) {
	87	+	if len(data) < altArrowLen {
	88	+	return 0, false
	89	+	}
	90	+	seq := data[:altArrowLen]
	91	+	if seq[1] != '[' \|\| seq[2] != '1' \|\| seq[3] != ';' \|\| (seq[4] != '3' && seq[4] != '9') {
	92	+	return 0, false
	93	+	}
	94	+	switch final := seq[5]; final {
	95	+	case 'A', 'B', 'C', 'D':
	96	+	return final, true
	97	+	default:
	98	+	return 0, false
	99	+	}
	100	+	}
	101	+
	102	+	// isAltArrowPrefix reports whether data is a strict prefix of an Alt/Meta
	103	+	// arrow CSI, meaning the next read may still complete it.
	104	+	func isAltArrowPrefix(data []byte) bool {
	105	+	if len(data) < 2 \|\| len(data) >= altArrowLen {
	106	+	return false
	107	+	}
	108	+	return matchesPrefix(data, "\x1b[1;3") \|\| matchesPrefix(data, "\x1b[1;9")
	109	+	}
	110	+
	111	+	func matchesPrefix(data []byte, want string) bool {
	112	+	return len(data) <= len(want) && string(data) == want[:len(data)]
	113	+	}
	114	+
	115	+	func partialUTF8Rune(data []byte) bool {
	116	+	if len(data) == 0 \|\| utf8.FullRune(data) {
	117	+	return false
	118	+	}
	119	+	key, size := utf8.DecodeRune(data)
	120	+	return key == utf8.RuneError && size == 1
	121	+	}

A internal/usecase/keys/tokenizer_test.go +59 -0

@@ -0,0 +1,59 @@
	1	+	package keys
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	"github.com/stretchr/testify/require"
	7	+	)
	8	+
	9	+	func TestScanEscape(t *testing.T) {
	10	+	paste := "\x1b[200~\x1bj\x1b[1;3A\x1b[201~"
	11	+	tests := []struct {
	12	+	name string
	13	+	in string
	14	+	kind escKind
	15	+	raw string
	16	+	rune rune
	17	+	arrow byte
	18	+	}{
	19	+	{name: "lone esc", in: "\x1b", kind: escIncomplete, raw: "\x1b"},
	20	+	{name: "alt letter", in: "\x1bj", kind: escAltRune, raw: "\x1bj", rune: 'j'},
	21	+	{name: "alt letter trailing bytes", in: "\x1bjxyz", kind: escAltRune, raw: "\x1bj", rune: 'j'},
	22	+	{name: "alt space", in: "\x1b ", kind: escAltRune, raw: "\x1b ", rune: ' '},
	23	+	{name: "alt utf8", in: "\x1bé", kind: escAltRune, raw: "\x1bé", rune: 'é'},
	24	+	{name: "alt utf8 truncated", in: "\x1b\xc3", kind: escIncomplete, raw: "\x1b\xc3"},
	25	+	{name: "alt invalid utf8", in: "\x1b\xc3X", kind: escBare, raw: "\x1b"},
	26	+	{name: "alt stray continuation", in: "\x1b\xa9", kind: escBare, raw: "\x1b"},
	27	+	{name: "double esc", in: "\x1b\x1b", kind: escAltRune, raw: "\x1b\x1b", rune: rune(ESC)},
	28	+	{name: "alt arrow", in: "\x1b[1;3A", kind: escAltArrow, raw: "\x1b[1;3A", arrow: 'A'},
	29	+	{name: "meta arrow trailing", in: "\x1b[1;9Dzz", kind: escAltArrow, raw: "\x1b[1;9D", arrow: 'D'},
	30	+	{name: "alt arrow prefix 2", in: "\x1b[", kind: escIncomplete, raw: "\x1b["},
	31	+	{name: "alt arrow prefix 3", in: "\x1b[1", kind: escIncomplete, raw: "\x1b[1"},
	32	+	{name: "alt arrow prefix 5", in: "\x1b[1;3", kind: escIncomplete, raw: "\x1b[1;3"},
	33	+	{name: "alt arrow wrong final", in: "\x1b[1;3E", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	34	+	{name: "ctrl arrow", in: "\x1b[1;5A", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	35	+	{name: "bare arrow", in: "\x1b[A", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	36	+	{name: "ss3", in: "\x1bOP", kind: escControlPrefix, raw: "\x1bO", rune: 'O'},
	37	+	{name: "paste complete", in: paste + "tail", kind: escPaste, raw: paste},
	38	+	{name: "paste unterminated", in: "\x1b[200~hello", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	39	+	}
	40	+	for _, tt := range tests {
	41	+	t.Run(tt.name, func(t *testing.T) {
	42	+	got := scanEscape([]byte(tt.in), false)
	43	+	require.Equal(t, tt.kind, got.kind)
	44	+	require.Equal(t, []byte(tt.raw), got.raw)
	45	+	require.Equal(t, tt.rune, got.rune)
	46	+	require.Equal(t, tt.arrow, got.arrow)
	47	+	})
	48	+	}
	49	+	}
	50	+
	51	+	func TestScanEscapeEveryAltArrowPrefixIsIncomplete(t *testing.T) {
	52	+	for _, full := range []string{"\x1b[1;3A", "\x1b[1;9C"} {
	53	+	for n := 1; n < len(full); n++ {
	54	+	got := scanEscape([]byte(full[:n]), false)
	55	+	require.Equal(t, escIncomplete, got.kind, "prefix %q", full[:n])
	56	+	require.Equal(t, []byte(full[:n]), got.raw)
	57	+	}
	58	+	}
	59	+	}

@@ -0,0 +1,59 @@
	1	+	package keys
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	"github.com/stretchr/testify/require"
	7	+	)
	8	+
	9	+	func TestScanEscape(t *testing.T) {
	10	+	paste := "\x1b[200~\x1bj\x1b[1;3A\x1b[201~"
	11	+	tests := []struct {
	12	+	name string
	13	+	in string
	14	+	kind escKind
	15	+	raw string
	16	+	rune rune
	17	+	arrow byte
	18	+	}{
	19	+	{name: "lone esc", in: "\x1b", kind: escIncomplete, raw: "\x1b"},
	20	+	{name: "alt letter", in: "\x1bj", kind: escAltRune, raw: "\x1bj", rune: 'j'},
	21	+	{name: "alt letter trailing bytes", in: "\x1bjxyz", kind: escAltRune, raw: "\x1bj", rune: 'j'},
	22	+	{name: "alt space", in: "\x1b ", kind: escAltRune, raw: "\x1b ", rune: ' '},
	23	+	{name: "alt utf8", in: "\x1bé", kind: escAltRune, raw: "\x1bé", rune: 'é'},
	24	+	{name: "alt utf8 truncated", in: "\x1b\xc3", kind: escIncomplete, raw: "\x1b\xc3"},
	25	+	{name: "alt invalid utf8", in: "\x1b\xc3X", kind: escBare, raw: "\x1b"},
	26	+	{name: "alt stray continuation", in: "\x1b\xa9", kind: escBare, raw: "\x1b"},
	27	+	{name: "double esc", in: "\x1b\x1b", kind: escAltRune, raw: "\x1b\x1b", rune: rune(ESC)},
	28	+	{name: "alt arrow", in: "\x1b[1;3A", kind: escAltArrow, raw: "\x1b[1;3A", arrow: 'A'},
	29	+	{name: "meta arrow trailing", in: "\x1b[1;9Dzz", kind: escAltArrow, raw: "\x1b[1;9D", arrow: 'D'},
	30	+	{name: "alt arrow prefix 2", in: "\x1b[", kind: escIncomplete, raw: "\x1b["},
	31	+	{name: "alt arrow prefix 3", in: "\x1b[1", kind: escIncomplete, raw: "\x1b[1"},
	32	+	{name: "alt arrow prefix 5", in: "\x1b[1;3", kind: escIncomplete, raw: "\x1b[1;3"},
	33	+	{name: "alt arrow wrong final", in: "\x1b[1;3E", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	34	+	{name: "ctrl arrow", in: "\x1b[1;5A", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	35	+	{name: "bare arrow", in: "\x1b[A", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	36	+	{name: "ss3", in: "\x1bOP", kind: escControlPrefix, raw: "\x1bO", rune: 'O'},
	37	+	{name: "paste complete", in: paste + "tail", kind: escPaste, raw: paste},
	38	+	{name: "paste unterminated", in: "\x1b[200~hello", kind: escControlPrefix, raw: "\x1b[", rune: '['},
	39	+	}
	40	+	for _, tt := range tests {
	41	+	t.Run(tt.name, func(t *testing.T) {
	42	+	got := scanEscape([]byte(tt.in), false)
	43	+	require.Equal(t, tt.kind, got.kind)
	44	+	require.Equal(t, []byte(tt.raw), got.raw)
	45	+	require.Equal(t, tt.rune, got.rune)
	46	+	require.Equal(t, tt.arrow, got.arrow)
	47	+	})
	48	+	}
	49	+	}
	50	+
	51	+	func TestScanEscapeEveryAltArrowPrefixIsIncomplete(t *testing.T) {
	52	+	for _, full := range []string{"\x1b[1;3A", "\x1b[1;9C"} {
	53	+	for n := 1; n < len(full); n++ {
	54	+	got := scanEscape([]byte(full[:n]), false)
	55	+	require.Equal(t, escIncomplete, got.kind, "prefix %q", full[:n])
	56	+	require.Equal(t, []byte(full[:n]), got.raw)
	57	+	}
	58	+	}
	59	+	}