Merge pull request #18: feat(scale): save scale-bind changes to the config with a notification

# Conflicts:
#	internal/app/app.go
#	internal/core/core.go

commit: 3c68abd6c33f35400d3759227b847e5b8f6cd66a
author: brice · 25d ago · 2026-09-27 14:28 UTC
merge of: 0049441 + 35f6f59 · diff against the first parent
signature: GPG VerifiedCD88F9E564E0102646FB6077A1A07C7C7C3E349D · arch-gpg Verified for the committer email

16 files · +738 -4

M .mockery.yml +2 -0


@@ -13,6 +13,8 @@ packages:
13	13		pkgname: portsmocks
14	14		filename: '{{.InterfaceFile \| base \| trimSuffix ".go"}}_mock.go'
15	15		interfaces:
	16	+	Notifier:
	17	+	OutputScaleStore:
16	18		Renderer:
17	19		Seat:
18	20		# Unexported adapter seams: mocks live next to the code, in test files.


@@ -13,6 +13,8 @@ packages:
13	pkgname: portsmocks	13		pkgname: portsmocks
14	filename: '{{.InterfaceFile \| base \| trimSuffix ".go"}}_mock.go'	14		filename: '{{.InterfaceFile \| base \| trimSuffix ".go"}}_mock.go'
15	interfaces:	15		interfaces:
		16	+	Notifier:
		17	+	OutputScaleStore:
16	Renderer:	18		Renderer:
17	Seat:	19		Seat:
18	# Unexported adapter seams: mocks live next to the code, in test files.	20		# Unexported adapter seams: mocks live next to the code, in test files.

M docs/config.md +1 -1


@@ -86,7 +86,7 @@ HDR requires DRM HDR connector properties, suitable KMS planes, and Vulkan fp16
86	86		\| `move-window-to-workspace <N>` / `-up/-down` \| Move only the focused window \|
87	87		\| `focus-monitor-left/right` \| Focus the neighbor monitor \|
88	88		\| `move-workspace-to-monitor-left/right` \| Move the workspace; it gets a new home \|
89		-	\| `scale-up` / `scale-down` \| Zoom the whole display \|
	89	+	\| `scale-up` / `scale-down` \| Zoom the whole display; one second after the last press, the scale is saved to `output.<name>.scale` and a notification confirms it (`notify-send`) \|
90	90		\| `quit` \| Exit NeferWL \|
91	91
92	92		### Default binds


@@ -86,7 +86,7 @@ HDR requires DRM HDR connector properties, suitable KMS planes, and Vulkan fp16
86		\| `move-window-to-workspace <N>` / `-up/-down` \| Move only the focused window \|	86		\| `move-window-to-workspace <N>` / `-up/-down` \| Move only the focused window \|
87		\| `focus-monitor-left/right` \| Focus the neighbor monitor \|	87		\| `focus-monitor-left/right` \| Focus the neighbor monitor \|
88		\| `move-workspace-to-monitor-left/right` \| Move the workspace; it gets a new home \|	88		\| `move-workspace-to-monitor-left/right` \| Move the workspace; it gets a new home \|
89	-	\| `scale-up` / `scale-down` \| Zoom the whole display \|	89	+	\| `scale-up` / `scale-down` \| Zoom the whole display; one second after the last press, the scale is saved to `output.<name>.scale` and a notification confirms it (`notify-send`) \|
90		\| `quit` \| Exit NeferWL \|	90		\| `quit` \| Exit NeferWL \|
91			91
92		### Default binds	92		### Default binds

M examples/config +2 -1


@@ -66,7 +66,8 @@ focus.follow-move = off
66	66		# output.DP-2 = 5120x2160@165.058
67	67		# output.HDMI-A-1 = off
68	68		# Scale (HiDPI), 1 to 4, like 1.5 or 4/3. Default 1. scale-up and scale-down
69		-	# step through the scales where the display divides into whole pixels.
	69	+	# step through the scales where the display divides into whole pixels and
	70	+	# save the result here.
70	71		# output.DP-2.scale = 4/3
71	72
72	73		render.direct-scanout = on


@@ -66,7 +66,8 @@ focus.follow-move = off
66		# output.DP-2 = 5120x2160@165.058	66		# output.DP-2 = 5120x2160@165.058
67		# output.HDMI-A-1 = off	67		# output.HDMI-A-1 = off
68		# Scale (HiDPI), 1 to 4, like 1.5 or 4/3. Default 1. scale-up and scale-down	68		# Scale (HiDPI), 1 to 4, like 1.5 or 4/3. Default 1. scale-up and scale-down
69	-	# step through the scales where the display divides into whole pixels.	69	+	# step through the scales where the display divides into whole pixels and
			70	+	# save the result here.
70		# output.DP-2.scale = 4/3	71		# output.DP-2.scale = 4/3
71			72
72		render.direct-scanout = on	73		render.direct-scanout = on

A internal/adapters/config/scalestore.go +123 -0

@@ -0,0 +1,123 @@
	1	+	package config
	2	+
	3	+	import (
	4	+	"bytes"
	5	+	"errors"
	6	+	"fmt"
	7	+	"math"
	8	+	"os"
	9	+	"path/filepath"
	10	+	"strconv"
	11	+	"strings"
	12	+	)
	13	+
	14	+	// ScaleStore writes output.<name>.scale into the config file. It edits the
	15	+	// value in place and keeps every other line, comments included.
	16	+	type ScaleStore struct{ Path string }
	17	+
	18	+	// SaveOutputScale sets output.<name>.scale, appending the key when the file
	19	+	// has none. The file is replaced atomically; a symlinked config is written
	20	+	// through to its target.
	21	+	func (s ScaleStore) SaveOutputScale(output string, scale float64) error {
	22	+	path := s.Path
	23	+	if info, err := os.Lstat(path); err == nil && info.Mode()&os.ModeSymlink != 0 {
	24	+	// Replacing a dangling link would lose it: report it instead.
	25	+	if path, err = filepath.EvalSymlinks(path); err != nil {
	26	+	return err
	27	+	}
	28	+	}
	29	+	data, err := os.ReadFile(path)
	30	+	// A new config may hold commands: only its owner reads it.
	31	+	mode := os.FileMode(0o600)
	32	+	switch {
	33	+	case errors.Is(err, os.ErrNotExist):
	34	+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
	35	+	return err
	36	+	}
	37	+	case err != nil:
	38	+	return err
	39	+	default:
	40	+	if info, err := os.Stat(path); err == nil {
	41	+	mode = info.Mode().Perm()
	42	+	}
	43	+	}
	44	+	return writeAtomic(path, setKey(data, "output."+output+".scale", formatScale(scale)), mode)
	45	+	}
	46	+
	47	+	// setKey replaces the value of the last line setting key (the one parse
	48	+	// keeps) or appends key = value.
	49	+	func setKey(data []byte, key, value string) []byte {
	50	+	lines := strings.SplitAfter(string(data), "\n")
	51	+	for i := len(lines) - 1; i >= 0; i-- {
	52	+	k, v, ok := strings.Cut(lines[i], "=")
	53	+	if !ok \|\| strings.TrimSpace(k) != key {
	54	+	continue
	55	+	}
	56	+	// Keep the spacing around = and an end-of-line comment.
	57	+	rest := strings.TrimRight(v, "\r\n")
	58	+	eol := v[len(rest):]
	59	+	old := stripComment(strings.TrimSpace(rest))
	60	+	start := strings.Index(rest, old)
	61	+	lines[i] = k + "=" + rest[:start] + value + rest[start+len(old):] + eol
	62	+	return []byte(strings.Join(lines, ""))
	63	+	}
	64	+	var b bytes.Buffer
	65	+	b.Write(data)
	66	+	if len(data) > 0 && data[len(data)-1] != '\n' {
	67	+	b.WriteByte('\n')
	68	+	}
	69	+	fmt.Fprintf(&b, "%s = %s\n", key, value)
	70	+	return b.Bytes()
	71	+	}
	72	+
	73	+	// formatScale writes scales as the config expects them: a decimal when it is
	74	+	// exact (1.25), else a fraction (4/3).
	75	+	func formatScale(s float64) string {
	76	+	n, d := int(math.Round(s*120)), 120
	77	+	g := gcd(n, d)
	78	+	n, d = n/g, d/g
	79	+	den := d
	80	+	for den%2 == 0 {
	81	+	den /= 2
	82	+	}
	83	+	for den%5 == 0 {
	84	+	den /= 5
	85	+	}
	86	+	if den == 1 {
	87	+	return strconv.FormatFloat(float64(n)/float64(d), 'f', -1, 64)
	88	+	}
	89	+	return fmt.Sprintf("%d/%d", n, d)
	90	+	}
	91	+
	92	+	func gcd(a, b int) int {
	93	+	for b != 0 {
	94	+	a, b = b, a%b
	95	+	}
	96	+	return a
	97	+	}
	98	+
	99	+	// writeAtomic replaces path with data: readers and the watcher never see a
	100	+	// half-written file.
	101	+	func writeAtomic(path string, data []byte, mode os.FileMode) error {
	102	+	tmp, err := os.CreateTemp(filepath.Dir(path), "."+filepath.Base(path)+".*")
	103	+	if err != nil {
	104	+	return err
	105	+	}
	106	+	defer os.Remove(tmp.Name())
	107	+	if _, err := tmp.Write(data); err != nil {
	108	+	tmp.Close()
	109	+	return err
	110	+	}
	111	+	if err := tmp.Chmod(mode); err != nil {
	112	+	tmp.Close()
	113	+	return err
	114	+	}
	115	+	if err := tmp.Sync(); err != nil {
	116	+	tmp.Close()
	117	+	return err
	118	+	}
	119	+	if err := tmp.Close(); err != nil {
	120	+	return err
	121	+	}
	122	+	return os.Rename(tmp.Name(), path)
	123	+	}

@@ -0,0 +1,123 @@
	1	+	package config
	2	+
	3	+	import (
	4	+	"bytes"
	5	+	"errors"
	6	+	"fmt"
	7	+	"math"
	8	+	"os"
	9	+	"path/filepath"
	10	+	"strconv"
	11	+	"strings"
	12	+	)
	13	+
	14	+	// ScaleStore writes output.<name>.scale into the config file. It edits the
	15	+	// value in place and keeps every other line, comments included.
	16	+	type ScaleStore struct{ Path string }
	17	+
	18	+	// SaveOutputScale sets output.<name>.scale, appending the key when the file
	19	+	// has none. The file is replaced atomically; a symlinked config is written
	20	+	// through to its target.
	21	+	func (s ScaleStore) SaveOutputScale(output string, scale float64) error {
	22	+	path := s.Path
	23	+	if info, err := os.Lstat(path); err == nil && info.Mode()&os.ModeSymlink != 0 {
	24	+	// Replacing a dangling link would lose it: report it instead.
	25	+	if path, err = filepath.EvalSymlinks(path); err != nil {
	26	+	return err
	27	+	}
	28	+	}
	29	+	data, err := os.ReadFile(path)
	30	+	// A new config may hold commands: only its owner reads it.
	31	+	mode := os.FileMode(0o600)
	32	+	switch {
	33	+	case errors.Is(err, os.ErrNotExist):
	34	+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
	35	+	return err
	36	+	}
	37	+	case err != nil:
	38	+	return err
	39	+	default:
	40	+	if info, err := os.Stat(path); err == nil {
	41	+	mode = info.Mode().Perm()
	42	+	}
	43	+	}
	44	+	return writeAtomic(path, setKey(data, "output."+output+".scale", formatScale(scale)), mode)
	45	+	}
	46	+
	47	+	// setKey replaces the value of the last line setting key (the one parse
	48	+	// keeps) or appends key = value.
	49	+	func setKey(data []byte, key, value string) []byte {
	50	+	lines := strings.SplitAfter(string(data), "\n")
	51	+	for i := len(lines) - 1; i >= 0; i-- {
	52	+	k, v, ok := strings.Cut(lines[i], "=")
	53	+	if !ok \|\| strings.TrimSpace(k) != key {
	54	+	continue
	55	+	}
	56	+	// Keep the spacing around = and an end-of-line comment.
	57	+	rest := strings.TrimRight(v, "\r\n")
	58	+	eol := v[len(rest):]
	59	+	old := stripComment(strings.TrimSpace(rest))
	60	+	start := strings.Index(rest, old)
	61	+	lines[i] = k + "=" + rest[:start] + value + rest[start+len(old):] + eol
	62	+	return []byte(strings.Join(lines, ""))
	63	+	}
	64	+	var b bytes.Buffer
	65	+	b.Write(data)
	66	+	if len(data) > 0 && data[len(data)-1] != '\n' {
	67	+	b.WriteByte('\n')
	68	+	}
	69	+	fmt.Fprintf(&b, "%s = %s\n", key, value)
	70	+	return b.Bytes()
	71	+	}
	72	+
	73	+	// formatScale writes scales as the config expects them: a decimal when it is
	74	+	// exact (1.25), else a fraction (4/3).
	75	+	func formatScale(s float64) string {
	76	+	n, d := int(math.Round(s*120)), 120
	77	+	g := gcd(n, d)
	78	+	n, d = n/g, d/g
	79	+	den := d
	80	+	for den%2 == 0 {
	81	+	den /= 2
	82	+	}
	83	+	for den%5 == 0 {
	84	+	den /= 5
	85	+	}
	86	+	if den == 1 {
	87	+	return strconv.FormatFloat(float64(n)/float64(d), 'f', -1, 64)
	88	+	}
	89	+	return fmt.Sprintf("%d/%d", n, d)
	90	+	}
	91	+
	92	+	func gcd(a, b int) int {
	93	+	for b != 0 {
	94	+	a, b = b, a%b
	95	+	}
	96	+	return a
	97	+	}
	98	+
	99	+	// writeAtomic replaces path with data: readers and the watcher never see a
	100	+	// half-written file.
	101	+	func writeAtomic(path string, data []byte, mode os.FileMode) error {
	102	+	tmp, err := os.CreateTemp(filepath.Dir(path), "."+filepath.Base(path)+".*")
	103	+	if err != nil {
	104	+	return err
	105	+	}
	106	+	defer os.Remove(tmp.Name())
	107	+	if _, err := tmp.Write(data); err != nil {
	108	+	tmp.Close()
	109	+	return err
	110	+	}
	111	+	if err := tmp.Chmod(mode); err != nil {
	112	+	tmp.Close()
	113	+	return err
	114	+	}
	115	+	if err := tmp.Sync(); err != nil {
	116	+	tmp.Close()
	117	+	return err
	118	+	}
	119	+	if err := tmp.Close(); err != nil {
	120	+	return err
	121	+	}
	122	+	return os.Rename(tmp.Name(), path)
	123	+	}

A internal/adapters/config/scalestore_test.go +105 -0

@@ -0,0 +1,105 @@
	1	+	package config
	2	+
	3	+	import (
	4	+	"math"
	5	+	"os"
	6	+	"path/filepath"
	7	+	"testing"
	8	+	)
	9	+
	10	+	func TestSaveOutputScale(t *testing.T) {
	11	+	for _, tc := range []struct {
	12	+	name, in, want string
	13	+	scale float64
	14	+	}{
	15	+	{"missing file", "", "output.DP-2.scale = 1.5\n", 1.5},
	16	+	{"append", "# my config\nborder.width = 3", "# my config\nborder.width = 3\noutput.DP-2.scale = 1.5\n", 1.5},
	17	+	{"replace in place", "output.DP-2.scale = 2 # big\n# end\n", "output.DP-2.scale = 1.25 # big\n# end\n", 1.25},
	18	+	{"keeps CRLF", "output.DP-2.scale = 2\r\nborder.width = 3\r\n", "output.DP-2.scale = 1.5\r\nborder.width = 3\r\n", 1.5},
	19	+	{"comment with = and #", "output.DP-2.scale = 2 # was a=b #1\n", "output.DP-2.scale = 1.5 # was a=b #1\n", 1.5},
	20	+	{"keeps spacing", "output.DP-2.scale=2\n", "output.DP-2.scale=4/3\n", 4.0 / 3},
	21	+	{"last line wins", "output.DP-2.scale = 2\noutput.DP-2.scale = 3\n", "output.DP-2.scale = 2\noutput.DP-2.scale = 5/3\n", 5.0 / 3},
	22	+	{"ignores comments and other outputs", "# output.DP-2.scale = 2\noutput.DP-1.scale = 2\n", "# output.DP-2.scale = 2\noutput.DP-1.scale = 2\noutput.DP-2.scale = 1\n", 1},
	23	+	} {
	24	+	t.Run(tc.name, func(t *testing.T) {
	25	+	path := filepath.Join(t.TempDir(), "neferwl", "config")
	26	+	if tc.in != "" {
	27	+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
	28	+	t.Fatal(err)
	29	+	}
	30	+	if err := os.WriteFile(path, []byte(tc.in), 0o600); err != nil {
	31	+	t.Fatal(err)
	32	+	}
	33	+	}
	34	+	if err := (ScaleStore{Path: path}).SaveOutputScale("DP-2", tc.scale); err != nil {
	35	+	t.Fatal(err)
	36	+	}
	37	+	got, err := os.ReadFile(path)
	38	+	if err != nil {
	39	+	t.Fatal(err)
	40	+	}
	41	+	if string(got) != tc.want {
	42	+	t.Fatalf("got\n%s\nwant\n%s", got, tc.want)
	43	+	}
	44	+	// The written value parses back to the same scale.
	45	+	cfg, _, err := Load(path)
	46	+	if err != nil {
	47	+	t.Fatal(err)
	48	+	}
	49	+	for _, o := range cfg.Outputs {
	50	+	if o.Name == "DP-2" && o.Scale != tc.scale {
	51	+	t.Fatalf("parsed %v, want %v", o.Scale, tc.scale)
	52	+	}
	53	+	}
	54	+	// Existing files keep their mode; new ones are private.
	55	+	{
	56	+	if info, _ := os.Stat(path); info.Mode().Perm() != 0o600 {
	57	+	t.Fatalf("mode %v", info.Mode().Perm())
	58	+	}
	59	+	}
	60	+	})
	61	+	}
	62	+	}
	63	+
	64	+	// A symlinked config (dotfiles) stays a symlink; its target gets the value.
	65	+	func TestSaveOutputScaleSymlink(t *testing.T) {
	66	+	dir := t.TempDir()
	67	+	target := filepath.Join(dir, "dotfiles-config")
	68	+	if err := os.WriteFile(target, []byte("border.width = 3\n"), 0o644); err != nil {
	69	+	t.Fatal(err)
	70	+	}
	71	+	link := filepath.Join(dir, "config")
	72	+	if err := os.Symlink(target, link); err != nil {
	73	+	t.Fatal(err)
	74	+	}
	75	+	if err := (ScaleStore{Path: link}).SaveOutputScale("DP-2", 2); err != nil {
	76	+	t.Fatal(err)
	77	+	}
	78	+	if info, err := os.Lstat(link); err != nil \|\| info.Mode()&os.ModeSymlink == 0 {
	79	+	t.Fatal("symlink replaced", err)
	80	+	}
	81	+	if got, _ := os.ReadFile(target); string(got) != "border.width = 3\noutput.DP-2.scale = 2\n" {
	82	+	t.Fatalf("%q", got)
	83	+	}
	84	+	// A dangling link is an error and stays in place.
	85	+	if err := os.Remove(target); err != nil {
	86	+	t.Fatal(err)
	87	+	}
	88	+	if err := (ScaleStore{Path: link}).SaveOutputScale("DP-2", 2); err == nil {
	89	+	t.Fatal("dangling link saved")
	90	+	}
	91	+	if info, err := os.Lstat(link); err != nil \|\| info.Mode()&os.ModeSymlink == 0 {
	92	+	t.Fatal("dangling symlink replaced", err)
	93	+	}
	94	+	}
	95	+
	96	+	// Every clean scale is written in a form the parser reads back exactly.
	97	+	func TestFormatScaleRoundTrip(t *testing.T) {
	98	+	for n := 120; n <= 480; n++ {
	99	+	s := float64(n) / 120
	100	+	got, err := parseScale(formatScale(s))
	101	+	if err != nil \|\| math.Round(got*120) != float64(n) {
	102	+	t.Fatalf("%d/120: %q parsed as %v, %v", n, formatScale(s), got, err)
	103	+	}
	104	+	}
	105	+	}

@@ -0,0 +1,105 @@
	1	+	package config
	2	+
	3	+	import (
	4	+	"math"
	5	+	"os"
	6	+	"path/filepath"
	7	+	"testing"
	8	+	)
	9	+
	10	+	func TestSaveOutputScale(t *testing.T) {
	11	+	for _, tc := range []struct {
	12	+	name, in, want string
	13	+	scale float64
	14	+	}{
	15	+	{"missing file", "", "output.DP-2.scale = 1.5\n", 1.5},
	16	+	{"append", "# my config\nborder.width = 3", "# my config\nborder.width = 3\noutput.DP-2.scale = 1.5\n", 1.5},
	17	+	{"replace in place", "output.DP-2.scale = 2 # big\n# end\n", "output.DP-2.scale = 1.25 # big\n# end\n", 1.25},
	18	+	{"keeps CRLF", "output.DP-2.scale = 2\r\nborder.width = 3\r\n", "output.DP-2.scale = 1.5\r\nborder.width = 3\r\n", 1.5},
	19	+	{"comment with = and #", "output.DP-2.scale = 2 # was a=b #1\n", "output.DP-2.scale = 1.5 # was a=b #1\n", 1.5},
	20	+	{"keeps spacing", "output.DP-2.scale=2\n", "output.DP-2.scale=4/3\n", 4.0 / 3},
	21	+	{"last line wins", "output.DP-2.scale = 2\noutput.DP-2.scale = 3\n", "output.DP-2.scale = 2\noutput.DP-2.scale = 5/3\n", 5.0 / 3},
	22	+	{"ignores comments and other outputs", "# output.DP-2.scale = 2\noutput.DP-1.scale = 2\n", "# output.DP-2.scale = 2\noutput.DP-1.scale = 2\noutput.DP-2.scale = 1\n", 1},
	23	+	} {
	24	+	t.Run(tc.name, func(t *testing.T) {
	25	+	path := filepath.Join(t.TempDir(), "neferwl", "config")
	26	+	if tc.in != "" {
	27	+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
	28	+	t.Fatal(err)
	29	+	}
	30	+	if err := os.WriteFile(path, []byte(tc.in), 0o600); err != nil {
	31	+	t.Fatal(err)
	32	+	}
	33	+	}
	34	+	if err := (ScaleStore{Path: path}).SaveOutputScale("DP-2", tc.scale); err != nil {
	35	+	t.Fatal(err)
	36	+	}
	37	+	got, err := os.ReadFile(path)
	38	+	if err != nil {
	39	+	t.Fatal(err)
	40	+	}
	41	+	if string(got) != tc.want {
	42	+	t.Fatalf("got\n%s\nwant\n%s", got, tc.want)
	43	+	}
	44	+	// The written value parses back to the same scale.
	45	+	cfg, _, err := Load(path)
	46	+	if err != nil {
	47	+	t.Fatal(err)
	48	+	}
	49	+	for _, o := range cfg.Outputs {
	50	+	if o.Name == "DP-2" && o.Scale != tc.scale {
	51	+	t.Fatalf("parsed %v, want %v", o.Scale, tc.scale)
	52	+	}
	53	+	}
	54	+	// Existing files keep their mode; new ones are private.
	55	+	{
	56	+	if info, _ := os.Stat(path); info.Mode().Perm() != 0o600 {
	57	+	t.Fatalf("mode %v", info.Mode().Perm())
	58	+	}
	59	+	}
	60	+	})
	61	+	}
	62	+	}
	63	+
	64	+	// A symlinked config (dotfiles) stays a symlink; its target gets the value.
	65	+	func TestSaveOutputScaleSymlink(t *testing.T) {
	66	+	dir := t.TempDir()
	67	+	target := filepath.Join(dir, "dotfiles-config")
	68	+	if err := os.WriteFile(target, []byte("border.width = 3\n"), 0o644); err != nil {
	69	+	t.Fatal(err)
	70	+	}
	71	+	link := filepath.Join(dir, "config")
	72	+	if err := os.Symlink(target, link); err != nil {
	73	+	t.Fatal(err)
	74	+	}
	75	+	if err := (ScaleStore{Path: link}).SaveOutputScale("DP-2", 2); err != nil {
	76	+	t.Fatal(err)
	77	+	}
	78	+	if info, err := os.Lstat(link); err != nil \|\| info.Mode()&os.ModeSymlink == 0 {
	79	+	t.Fatal("symlink replaced", err)
	80	+	}
	81	+	if got, _ := os.ReadFile(target); string(got) != "border.width = 3\noutput.DP-2.scale = 2\n" {
	82	+	t.Fatalf("%q", got)
	83	+	}
	84	+	// A dangling link is an error and stays in place.
	85	+	if err := os.Remove(target); err != nil {
	86	+	t.Fatal(err)
	87	+	}
	88	+	if err := (ScaleStore{Path: link}).SaveOutputScale("DP-2", 2); err == nil {
	89	+	t.Fatal("dangling link saved")
	90	+	}
	91	+	if info, err := os.Lstat(link); err != nil \|\| info.Mode()&os.ModeSymlink == 0 {
	92	+	t.Fatal("dangling symlink replaced", err)
	93	+	}
	94	+	}
	95	+
	96	+	// Every clean scale is written in a form the parser reads back exactly.
	97	+	func TestFormatScaleRoundTrip(t *testing.T) {
	98	+	for n := 120; n <= 480; n++ {
	99	+	s := float64(n) / 120
	100	+	got, err := parseScale(formatScale(s))
	101	+	if err != nil \|\| math.Round(got*120) != float64(n) {
	102	+	t.Fatalf("%d/120: %q parsed as %v, %v", n, formatScale(s), got, err)
	103	+	}
	104	+	}
	105	+	}

A internal/adapters/launcher/notify.go +42 -0

@@ -0,0 +1,42 @@
	1	+	package launcher
	2	+
	3	+	import (
	4	+	"context"
	5	+	"os/exec"
	6	+	"time"
	7	+
	8	+	"github.com/bnema/zerowrap"
	9	+	)
	10	+
	11	+	// Notifier shows desktop notifications with notify-send, so any
	12	+	// notification daemon of the session (mako, dunst…) displays them.
	13	+	type Notifier struct {
	14	+	ctx context.Context
	15	+	env []string
	16	+	log zerowrap.Logger
	17	+	}
	18	+
	19	+	// NewNotifier runs notify-send with the child environment, which carries
	20	+	// the session bus address. Ending ctx kills running notify-send processes.
	21	+	func NewNotifier(ctx context.Context, env []string, log zerowrap.Logger) *Notifier {
	22	+	return &Notifier{ctx: ctx, env: append([]string(nil), env...), log: log}
	23	+	}
	24	+
	25	+	// Notify starts notify-send and returns; it is killed after five seconds.
	26	+	// A missing tool or daemon only logs a warning.
	27	+	func (n *Notifier) Notify(summary, body string) {
	28	+	path, err := childLookPath("notify-send", n.env)
	29	+	if err != nil {
	30	+	n.log.Warn().Err(err).Str("summary", summary).Msg("notification skipped: notify-send not found")
	31	+	return
	32	+	}
	33	+	go func() {
	34	+	ctx, cancel := context.WithTimeout(n.ctx, 5*time.Second)
	35	+	defer cancel()
	36	+	cmd := exec.CommandContext(ctx, path, "--app-name=neferwl", "--", summary, body)
	37	+	cmd.Env = n.env
	38	+	if out, err := cmd.CombinedOutput(); err != nil && n.ctx.Err() == nil {
	39	+	n.log.Warn().Err(err).Str("output", string(out)).Str("summary", summary).Msg("notification failed")
	40	+	}
	41	+	}()
	42	+	}

@@ -0,0 +1,42 @@
	1	+	package launcher
	2	+
	3	+	import (
	4	+	"context"
	5	+	"os/exec"
	6	+	"time"
	7	+
	8	+	"github.com/bnema/zerowrap"
	9	+	)
	10	+
	11	+	// Notifier shows desktop notifications with notify-send, so any
	12	+	// notification daemon of the session (mako, dunst…) displays them.
	13	+	type Notifier struct {
	14	+	ctx context.Context
	15	+	env []string
	16	+	log zerowrap.Logger
	17	+	}
	18	+
	19	+	// NewNotifier runs notify-send with the child environment, which carries
	20	+	// the session bus address. Ending ctx kills running notify-send processes.
	21	+	func NewNotifier(ctx context.Context, env []string, log zerowrap.Logger) *Notifier {
	22	+	return &Notifier{ctx: ctx, env: append([]string(nil), env...), log: log}
	23	+	}
	24	+
	25	+	// Notify starts notify-send and returns; it is killed after five seconds.
	26	+	// A missing tool or daemon only logs a warning.
	27	+	func (n *Notifier) Notify(summary, body string) {
	28	+	path, err := childLookPath("notify-send", n.env)
	29	+	if err != nil {
	30	+	n.log.Warn().Err(err).Str("summary", summary).Msg("notification skipped: notify-send not found")
	31	+	return
	32	+	}
	33	+	go func() {
	34	+	ctx, cancel := context.WithTimeout(n.ctx, 5*time.Second)
	35	+	defer cancel()
	36	+	cmd := exec.CommandContext(ctx, path, "--app-name=neferwl", "--", summary, body)
	37	+	cmd.Env = n.env
	38	+	if out, err := cmd.CombinedOutput(); err != nil && n.ctx.Err() == nil {
	39	+	n.log.Warn().Err(err).Str("output", string(out)).Str("summary", summary).Msg("notification failed")
	40	+	}
	41	+	}()
	42	+	}

A internal/adapters/launcher/notify_test.go +38 -0

@@ -0,0 +1,38 @@
	1	+	package launcher
	2	+
	3	+	import (
	4	+	"context"
	5	+	"os"
	6	+	"path/filepath"
	7	+	"testing"
	8	+	"time"
	9	+
	10	+	"github.com/bnema/neferwl/internal/logging"
	11	+	)
	12	+
	13	+	// notify-send runs with the child environment and the summary and body as
	14	+	// separate arguments; the script on PATH records them.
	15	+	func TestNotifier(t *testing.T) {
	16	+	dir := t.TempDir()
	17	+	out := filepath.Join(dir, "calls")
	18	+	script := "#!/bin/sh\nprintf '%s\|' \"$@\" \"$DBUS_SESSION_BUS_ADDRESS\" > " + out + ".tmp && mv " + out + ".tmp " + out + "\n"
	19	+	if err := os.WriteFile(filepath.Join(dir, "notify-send"), []byte(script), 0o755); err != nil {
	20	+	t.Fatal(err)
	21	+	}
	22	+	ctx := context.Background()
	23	+	log := logging.For(ctx, "launcher")
	24	+	NewNotifier(ctx, []string{"PATH=" + dir + ":/usr/bin:/bin", "DBUS_SESSION_BUS_ADDRESS=unix:path=/tmp/bus"}, log).Notify("DP-2 scale saved", "-Scale 1.5")
	25	+	// Notify returns at once; wait for the script to record the call.
	26	+	data, err := os.ReadFile(out)
	27	+	for deadline := time.Now().Add(5 * time.Second); err != nil; data, err = os.ReadFile(out) {
	28	+	if time.Now().After(deadline) {
	29	+	t.Fatal("notify-send not run")
	30	+	}
	31	+	time.Sleep(10 * time.Millisecond)
	32	+	}
	33	+	if want := "--app-name=neferwl\|--\|DP-2 scale saved\|-Scale 1.5\|unix:path=/tmp/bus\|"; string(data) != want {
	34	+	t.Fatalf("got %q, want %q", data, want)
	35	+	}
	36	+	// A missing notify-send is skipped, not fatal.
	37	+	NewNotifier(ctx, []string{"PATH=" + t.TempDir()}, log).Notify("x", "y")
	38	+	}

@@ -0,0 +1,38 @@
	1	+	package launcher
	2	+
	3	+	import (
	4	+	"context"
	5	+	"os"
	6	+	"path/filepath"
	7	+	"testing"
	8	+	"time"
	9	+
	10	+	"github.com/bnema/neferwl/internal/logging"
	11	+	)
	12	+
	13	+	// notify-send runs with the child environment and the summary and body as
	14	+	// separate arguments; the script on PATH records them.
	15	+	func TestNotifier(t *testing.T) {
	16	+	dir := t.TempDir()
	17	+	out := filepath.Join(dir, "calls")
	18	+	script := "#!/bin/sh\nprintf '%s\|' \"$@\" \"$DBUS_SESSION_BUS_ADDRESS\" > " + out + ".tmp && mv " + out + ".tmp " + out + "\n"
	19	+	if err := os.WriteFile(filepath.Join(dir, "notify-send"), []byte(script), 0o755); err != nil {
	20	+	t.Fatal(err)
	21	+	}
	22	+	ctx := context.Background()
	23	+	log := logging.For(ctx, "launcher")
	24	+	NewNotifier(ctx, []string{"PATH=" + dir + ":/usr/bin:/bin", "DBUS_SESSION_BUS_ADDRESS=unix:path=/tmp/bus"}, log).Notify("DP-2 scale saved", "-Scale 1.5")
	25	+	// Notify returns at once; wait for the script to record the call.
	26	+	data, err := os.ReadFile(out)
	27	+	for deadline := time.Now().Add(5 * time.Second); err != nil; data, err = os.ReadFile(out) {
	28	+	if time.Now().After(deadline) {
	29	+	t.Fatal("notify-send not run")
	30	+	}
	31	+	time.Sleep(10 * time.Millisecond)
	32	+	}
	33	+	if want := "--app-name=neferwl\|--\|DP-2 scale saved\|-Scale 1.5\|unix:path=/tmp/bus\|"; string(data) != want {
	34	+	t.Fatalf("got %q, want %q", data, want)
	35	+	}
	36	+	// A missing notify-send is skipped, not fatal.
	37	+	NewNotifier(ctx, []string{"PATH=" + t.TempDir()}, log).Notify("x", "y")
	38	+	}

M internal/app/app.go +13 -1


@@ -100,7 +100,12 @@ func run(ctx context.Context, opts Options, inject func(chan<- ports.InputEvent)
100	100		appliedOutput := make(chan ports.OutputApplied, 8)
101	101		backendConfig := make(chan ports.Config, 8)
102	102		backendApplied := make(chan error, 8)
103		-	ch := core.Channels{Client: client, Input: input, Output: output, Config: configChanges, Commands: commands, Spawn: spawn, Scenes: scenes, Layouts: layouts, Constraints: constraints, State: states, Workspaces: workspaces, ConfigErrors: configErrors, Terminal: !opts.NoTerminal}
	103	+	var scales chan ports.ScaleChanged
	104	+	if hw != nil {
	105	+	// Only real sessions save scales: headless runs never touch the config file.
	106	+	scales = make(chan ports.ScaleChanged, 8)
	107	+	}
	108	+	ch := core.Channels{Scales: scales, Client: client, Input: input, Output: output, Config: configChanges, Commands: commands, Spawn: spawn, Scenes: scenes, Layouts: layouts, Constraints: constraints, State: states, Workspaces: workspaces, ConfigErrors: configErrors, Terminal: !opts.NoTerminal}
104	109		c, err := core.New(opts.Config, ch)
105	110		if err != nil {
106	111		return err

@@ -154,6 +159,13 @@ func run(ctx context.Context, opts Options, inject func(chan<- ports.InputEvent)
154	159		defer workers.Done()
155	160		done <- config.Watch(ctx, path, watched, logging.For(ctx, "config"))
156	161		}()
	162	+	if scales != nil {
	163	+	workers.Add(1)
	164	+	go func() {
	165	+	defer workers.Done()
	166	+	core.PersistScales(ctx, scales, config.ScaleStore{Path: path}, launcher.NewNotifier(ctx, childEnv, logging.For(ctx, "launcher")), time.Second)
	167	+	}()
	168	+	}
157	169		filtered := make(chan ports.ConfigChanged, 8)
158	170		workers.Add(1)
159	171		go func() {

 	appliedOutput := make(chan ports.OutputApplied, 8)
 	backendConfig := make(chan ports.Config, 8)
 	backendApplied := make(chan error, 8)
-	ch := core.Channels{Client: client, Input: input, Output: output, Config: configChanges, Commands: commands, Spawn: spawn, Scenes: scenes, Layouts: layouts, Constraints: constraints, State: states, Workspaces: workspaces, ConfigErrors: configErrors, Terminal: !opts.NoTerminal}
+	var scales chan ports.ScaleChanged
+	if hw != nil {
+		// Only real sessions save scales: headless runs never touch the config file.
+		scales = make(chan ports.ScaleChanged, 8)
+	}
+	ch := core.Channels{Scales: scales, Client: client, Input: input, Output: output, Config: configChanges, Commands: commands, Spawn: spawn, Scenes: scenes, Layouts: layouts, Constraints: constraints, State: states, Workspaces: workspaces, ConfigErrors: configErrors, Terminal: !opts.NoTerminal}
 	c, err := core.New(opts.Config, ch)
 	if err != nil {
 		return err
 		defer workers.Done()
 		done <- config.Watch(ctx, path, watched, logging.For(ctx, "config"))
 	}()
+	if scales != nil {
+		workers.Add(1)
+		go func() {
+			defer workers.Done()
+			core.PersistScales(ctx, scales, config.ScaleStore{Path: path}, launcher.NewNotifier(ctx, childEnv, logging.For(ctx, "launcher")), time.Second)
+		}()
+	}
 	filtered := make(chan ports.ConfigChanged, 8)
 	workers.Add(1)
 	go func() {

M internal/app/outputmanagement.go +50 -1


@@ -5,6 +5,7 @@ import (
5	5		"fmt"
6	6		"image"
7	7		"math"
	8	+	"reflect"
8	9		"slices"
9	10
10	11		"github.com/bnema/neferwl/internal/ports"

@@ -42,11 +43,59 @@ func (o *outputOverrides) effective() ports.Config {
42	43		}
43	44		return cfg
44	45		}
	46	+
	47	+	// reload replaces the file configuration. Runtime overrides are dropped,
	48	+	// unless only output scales changed (a saved scale bind): then they stay and
	49	+	// take the new file scales.
45	50		func (o *outputOverrides) reload(file ports.Config) ports.Config {
	51	+	scales, onlyScales := scaleChanges(o.file, file)
46	52		o.file = file
47		-	clear(o.overrides)
	53	+	if !onlyScales {
	54	+	clear(o.overrides)
	55	+	return o.effective()
	56	+	}
	57	+	for name, scale := range scales {
	58	+	if entry, ok := o.overrides[name]; ok {
	59	+	entry.Scale = scale
	60	+	o.overrides[name] = entry
	61	+	}
	62	+	}
48	63		return o.effective()
49	64		}
	65	+
	66	+	// scaleChanges lists the output scales that differ from old to cur, and
	67	+	// reports whether nothing else differs.
	68	+	func scaleChanges(old, cur ports.Config) (map[string]float64, bool) {
	69	+	scaleOf := func(c ports.Config, name string) float64 {
	70	+	for _, o := range c.Outputs {
	71	+	if o.Name == name {
	72	+	return o.Scale
	73	+	}
	74	+	}
	75	+	return 0
	76	+	}
	77	+	// Without scales, an output.<name>.scale-only entry is empty: drop it.
	78	+	strip := func(c ports.Config) ports.Config {
	79	+	c.Outputs = slices.Clone(c.Outputs)
	80	+	for i := range c.Outputs {
	81	+	c.Outputs[i].Scale = 0
	82	+	}
	83	+	c.Outputs = slices.DeleteFunc(c.Outputs, func(o ports.OutputConfig) bool {
	84	+	return o == ports.OutputConfig{Name: o.Name, ScaleOnly: true, SDRBrightness: ports.DefaultSDRBrightness}
	85	+	})
	86	+	return c
	87	+	}
	88	+	if !reflect.DeepEqual(strip(old), strip(cur)) {
	89	+	return nil, false
	90	+	}
	91	+	scales := map[string]float64{}
	92	+	for _, o := range cur.Outputs {
	93	+	if o.Scale != scaleOf(old, o.Name) {
	94	+	scales[o.Name] = o.Scale
	95	+	}
	96	+	}
	97	+	return scales, true
	98	+	}
50	99		func (o *outputOverrides) validate(req ports.OutputApply) error {
51	100		if len(req.Heads) != len(o.heads.Heads) {
52	101		return fmt.Errorf("incomplete head configuration")


@@ -5,6 +5,7 @@ import (
5		"fmt"	5		"fmt"
6		"image"	6		"image"
7		"math"	7		"math"
			8	+	"reflect"
8		"slices"	9		"slices"
9			10
10		"github.com/bnema/neferwl/internal/ports"	11		"github.com/bnema/neferwl/internal/ports"

@@ -42,11 +43,59 @@ func (o *outputOverrides) effective() ports.Config {
42		}	43		}
43		return cfg	44		return cfg
44		}	45		}
			46	+
			47	+	// reload replaces the file configuration. Runtime overrides are dropped,
			48	+	// unless only output scales changed (a saved scale bind): then they stay and
			49	+	// take the new file scales.
45		func (o *outputOverrides) reload(file ports.Config) ports.Config {	50		func (o *outputOverrides) reload(file ports.Config) ports.Config {
			51	+	scales, onlyScales := scaleChanges(o.file, file)
46		o.file = file	52		o.file = file
47	-	clear(o.overrides)	53	+	if !onlyScales {
			54	+	clear(o.overrides)
			55	+	return o.effective()
			56	+	}
			57	+	for name, scale := range scales {
			58	+	if entry, ok := o.overrides[name]; ok {
			59	+	entry.Scale = scale
			60	+	o.overrides[name] = entry
			61	+	}
			62	+	}
48		return o.effective()	63		return o.effective()
49		}	64		}
			65	+
			66	+	// scaleChanges lists the output scales that differ from old to cur, and
			67	+	// reports whether nothing else differs.
			68	+	func scaleChanges(old, cur ports.Config) (map[string]float64, bool) {
			69	+	scaleOf := func(c ports.Config, name string) float64 {
			70	+	for _, o := range c.Outputs {
			71	+	if o.Name == name {
			72	+	return o.Scale
			73	+	}
			74	+	}
			75	+	return 0
			76	+	}
			77	+	// Without scales, an output.<name>.scale-only entry is empty: drop it.
			78	+	strip := func(c ports.Config) ports.Config {
			79	+	c.Outputs = slices.Clone(c.Outputs)
			80	+	for i := range c.Outputs {
			81	+	c.Outputs[i].Scale = 0
			82	+	}
			83	+	c.Outputs = slices.DeleteFunc(c.Outputs, func(o ports.OutputConfig) bool {
			84	+	return o == ports.OutputConfig{Name: o.Name, ScaleOnly: true, SDRBrightness: ports.DefaultSDRBrightness}
			85	+	})
			86	+	return c
			87	+	}
			88	+	if !reflect.DeepEqual(strip(old), strip(cur)) {
			89	+	return nil, false
			90	+	}
			91	+	scales := map[string]float64{}
			92	+	for _, o := range cur.Outputs {
			93	+	if o.Scale != scaleOf(old, o.Name) {
			94	+	scales[o.Name] = o.Scale
			95	+	}
			96	+	}
			97	+	return scales, true
			98	+	}
50		func (o *outputOverrides) validate(req ports.OutputApply) error {	99		func (o *outputOverrides) validate(req ports.OutputApply) error {
51		if len(req.Heads) != len(o.heads.Heads) {	100		if len(req.Heads) != len(o.heads.Heads) {
52		return fmt.Errorf("incomplete head configuration")	101		return fmt.Errorf("incomplete head configuration")

M internal/app/outputmanagement_test.go +23 -0


@@ -210,3 +210,26 @@ func TestReloadDuringPendingApply(t *testing.T) {
210	210		<-backend
211	211		backendDone <- nil
212	212		}
	213	+
	214	+	// A reload that only changes output scales (a saved scale bind) keeps the
	215	+	// runtime overrides; any other change drops them.
	216	+	func TestReloadScaleOnlyKeepsOverrides(t *testing.T) {
	217	+	mode := ports.OutputMode{Width: 1920, Height: 1080, RefreshMilli: 60000}
	218	+	file := ports.Config{Outputs: []ports.OutputConfig{{Name: "DP-1", Scale: 2}}}
	219	+	state := newOutputOverrides(file, false)
	220	+	state.heads = ports.OutputHeads{Heads: []ports.OutputHead{{Info: ports.OutputInfo{Name: "DP-1"}, Enabled: true, Current: &mode, Modes: []ports.OutputMode{mode}}, {Info: ports.OutputInfo{Name: "DP-2"}, Enabled: true, Current: &mode, Modes: []ports.OutputMode{mode}}}}
	221	+	if _, err := state.apply(ports.OutputApply{Heads: []ports.HeadChange{{Name: "DP-1", Enabled: true, Pos: &image.Point{X: 100}}, {Name: "DP-2", Enabled: true}}}); err != nil {
	222	+	t.Fatal(err)
	223	+	}
	224	+	scaled := file
	225	+	scaled.Outputs = []ports.OutputConfig{{Name: "DP-1", Scale: 1.5}, {Name: "DP-2", Scale: 1.25, ScaleOnly: true, SDRBrightness: ports.DefaultSDRBrightness}}
	226	+	cfg := state.reload(scaled)
	227	+	if len(cfg.Outputs) != 2 \|\| cfg.Outputs[0].Pos == nil \|\| cfg.Outputs[0].Scale != 1.5 \|\| cfg.Outputs[1].Scale != 1.25 {
	228	+	t.Fatalf("scale-only reload: %+v", cfg.Outputs)
	229	+	}
	230	+	other := scaled
	231	+	other.Layout.Gaps = 4
	232	+	if cfg := state.reload(other); cfg.Outputs[0].Pos != nil {
	233	+	t.Fatalf("other reload kept overrides: %+v", cfg.Outputs)
	234	+	}
	235	+	}


@@ -210,3 +210,26 @@ func TestReloadDuringPendingApply(t *testing.T) {
210	<-backend	210		<-backend
211	backendDone <- nil	211		backendDone <- nil
212	}	212		}
		213	+
		214	+	// A reload that only changes output scales (a saved scale bind) keeps the
		215	+	// runtime overrides; any other change drops them.
		216	+	func TestReloadScaleOnlyKeepsOverrides(t *testing.T) {
		217	+	mode := ports.OutputMode{Width: 1920, Height: 1080, RefreshMilli: 60000}
		218	+	file := ports.Config{Outputs: []ports.OutputConfig{{Name: "DP-1", Scale: 2}}}
		219	+	state := newOutputOverrides(file, false)
		220	+	state.heads = ports.OutputHeads{Heads: []ports.OutputHead{{Info: ports.OutputInfo{Name: "DP-1"}, Enabled: true, Current: &mode, Modes: []ports.OutputMode{mode}}, {Info: ports.OutputInfo{Name: "DP-2"}, Enabled: true, Current: &mode, Modes: []ports.OutputMode{mode}}}}
		221	+	if _, err := state.apply(ports.OutputApply{Heads: []ports.HeadChange{{Name: "DP-1", Enabled: true, Pos: &image.Point{X: 100}}, {Name: "DP-2", Enabled: true}}}); err != nil {
		222	+	t.Fatal(err)
		223	+	}
		224	+	scaled := file
		225	+	scaled.Outputs = []ports.OutputConfig{{Name: "DP-1", Scale: 1.5}, {Name: "DP-2", Scale: 1.25, ScaleOnly: true, SDRBrightness: ports.DefaultSDRBrightness}}
		226	+	cfg := state.reload(scaled)
		227	+	if len(cfg.Outputs) != 2 \|\| cfg.Outputs[0].Pos == nil \|\| cfg.Outputs[0].Scale != 1.5 \|\| cfg.Outputs[1].Scale != 1.25 {
		228	+	t.Fatalf("scale-only reload: %+v", cfg.Outputs)
		229	+	}
		230	+	other := scaled
		231	+	other.Layout.Gaps = 4
		232	+	if cfg := state.reload(other); cfg.Outputs[0].Pos != nil {
		233	+	t.Fatalf("other reload kept overrides: %+v", cfg.Outputs)
		234	+	}
		235	+	}

M internal/core/core.go +11 -0


@@ -38,6 +38,9 @@ type Channels struct {
38	38		// latest first (capacity 1, drained like Scenes).
39	39		State chan ports.State
40	40		Workspaces chan ports.Workspaces
	41	+	// Scales, when set, receives each scale a scale bind sets, to persist it.
	42	+	// Core does not wait: a full channel drops the change.
	43	+	Scales chan<- ports.ScaleChanged
41	44		// Terminal enables automatic terminal opening according to terminal.auto-open.
42	45		Terminal bool
43	46		}

@@ -960,8 +963,16 @@ func (c *Core) Run(ctx context.Context) error {
960	963		dir = -1
961	964		}
962	965		sc := c.cur()
	966	+	prev := sc.scale
963	967		sc.setScale(StepScale(sc.info.Width, sc.info.Height, sc.scale, dir))
964	968		c.order()
	969	+	if c.ch.Scales != nil && sc.scale != prev && sc.name() != "" {
	970	+	// Never wait on persistence: a stalled save drops the change.
	971	+	select {
	972	+	case c.ch.Scales <- ports.ScaleChanged{Output: sc.name(), Scale: sc.scale}:
	973	+	default:
	974	+	}
	975	+	}
965	976		if err := c.publish(ctx); err != nil {
966	977		return nil
967	978		}


@@ -38,6 +38,9 @@ type Channels struct {
38	// latest first (capacity 1, drained like Scenes).	38		// latest first (capacity 1, drained like Scenes).
39	State chan ports.State	39		State chan ports.State
40	Workspaces chan ports.Workspaces	40		Workspaces chan ports.Workspaces
		41	+	// Scales, when set, receives each scale a scale bind sets, to persist it.
		42	+	// Core does not wait: a full channel drops the change.
		43	+	Scales chan<- ports.ScaleChanged
41	// Terminal enables automatic terminal opening according to terminal.auto-open.	44		// Terminal enables automatic terminal opening according to terminal.auto-open.
42	Terminal bool	45		Terminal bool
43	}	46		}

@@ -960,8 +963,16 @@ func (c *Core) Run(ctx context.Context) error {
960	dir = -1	963		dir = -1
961	}	964		}
962	sc := c.cur()	965		sc := c.cur()
		966	+	prev := sc.scale
963	sc.setScale(StepScale(sc.info.Width, sc.info.Height, sc.scale, dir))	967		sc.setScale(StepScale(sc.info.Width, sc.info.Height, sc.scale, dir))
964	c.order()	968		c.order()
		969	+	if c.ch.Scales != nil && sc.scale != prev && sc.name() != "" {
		970	+	// Never wait on persistence: a stalled save drops the change.
		971	+	select {
		972	+	case c.ch.Scales <- ports.ScaleChanged{Output: sc.name(), Scale: sc.scale}:
		973	+	default:
		974	+	}
		975	+	}
965	if err := c.publish(ctx); err != nil {	976		if err := c.publish(ctx); err != nil {
966	return nil	977		return nil
967	}	978		}

A internal/core/persist.go +42 -0

@@ -0,0 +1,42 @@
	1	+	package core
	2	+
	3	+	import (
	4	+	"context"
	5	+	"fmt"
	6	+	"maps"
	7	+	"slices"
	8	+	"time"
	9	+
	10	+	"github.com/bnema/neferwl/internal/ports"
	11	+	)
	12	+
	13	+	// PersistScales saves the scales set by scale binds once they settle for
	14	+	// debounce, so a burst of Cmd+= presses writes the config once, and tells
	15	+	// the user through notes. It runs until ctx ends; pending scales are then
	16	+	// dropped.
	17	+	func PersistScales(ctx context.Context, changes <-chan ports.ScaleChanged, store ports.OutputScaleStore, notes ports.Notifier, debounce time.Duration) {
	18	+	pending := map[string]float64{}
	19	+	timer := time.NewTimer(debounce)
	20	+	timer.Stop()
	21	+	for {
	22	+	select {
	23	+	case <-ctx.Done():
	24	+	timer.Stop()
	25	+	return
	26	+	case ev := <-changes:
	27	+	pending[ev.Output] = ev.Scale
	28	+	timer.Reset(debounce)
	29	+	case <-timer.C:
	30	+	// Sorted: several outputs save and notify in a stable order.
	31	+	for _, name := range slices.Sorted(maps.Keys(pending)) {
	32	+	scale := pending[name]
	33	+	if err := store.SaveOutputScale(name, scale); err != nil {
	34	+	notes.Notify(name+" scale not saved", err.Error())
	35	+	continue
	36	+	}
	37	+	notes.Notify(name+" scale saved", fmt.Sprintf("Scale %.4g is kept after restart", scale))
	38	+	}
	39	+	clear(pending)
	40	+	}
	41	+	}
	42	+	}

@@ -0,0 +1,42 @@
	1	+	package core
	2	+
	3	+	import (
	4	+	"context"
	5	+	"fmt"
	6	+	"maps"
	7	+	"slices"
	8	+	"time"
	9	+
	10	+	"github.com/bnema/neferwl/internal/ports"
	11	+	)
	12	+
	13	+	// PersistScales saves the scales set by scale binds once they settle for
	14	+	// debounce, so a burst of Cmd+= presses writes the config once, and tells
	15	+	// the user through notes. It runs until ctx ends; pending scales are then
	16	+	// dropped.
	17	+	func PersistScales(ctx context.Context, changes <-chan ports.ScaleChanged, store ports.OutputScaleStore, notes ports.Notifier, debounce time.Duration) {
	18	+	pending := map[string]float64{}
	19	+	timer := time.NewTimer(debounce)
	20	+	timer.Stop()
	21	+	for {
	22	+	select {
	23	+	case <-ctx.Done():
	24	+	timer.Stop()
	25	+	return
	26	+	case ev := <-changes:
	27	+	pending[ev.Output] = ev.Scale
	28	+	timer.Reset(debounce)
	29	+	case <-timer.C:
	30	+	// Sorted: several outputs save and notify in a stable order.
	31	+	for _, name := range slices.Sorted(maps.Keys(pending)) {
	32	+	scale := pending[name]
	33	+	if err := store.SaveOutputScale(name, scale); err != nil {
	34	+	notes.Notify(name+" scale not saved", err.Error())
	35	+	continue
	36	+	}
	37	+	notes.Notify(name+" scale saved", fmt.Sprintf("Scale %.4g is kept after restart", scale))
	38	+	}
	39	+	clear(pending)
	40	+	}
	41	+	}
	42	+	}

A internal/core/persist_test.go +83 -0

@@ -0,0 +1,83 @@
	1	+	package core_test
	2	+
	3	+	import (
	4	+	"context"
	5	+	"errors"
	6	+	"testing"
	7	+	"time"
	8	+
	9	+	"github.com/bnema/neferwl/internal/adapters/config"
	10	+	"github.com/bnema/neferwl/internal/core"
	11	+	portsmocks "github.com/bnema/neferwl/internal/mocks/ports"
	12	+	"github.com/bnema/neferwl/internal/ports"
	13	+	)
	14	+
	15	+	// A burst of scale changes saves only the last scale of each output, once.
	16	+	func TestPersistScalesDebounces(t *testing.T) {
	17	+	store := portsmocks.NewMockOutputScaleStore(t)
	18	+	notes := portsmocks.NewMockNotifier(t)
	19	+	done := make(chan struct{}, 2)
	20	+	store.EXPECT().SaveOutputScale("DP-1", 1.25).Return(nil).Once()
	21	+	store.EXPECT().SaveOutputScale("DP-2", 2.0).Return(nil).Once()
	22	+	notes.EXPECT().Notify("DP-1 scale saved", "Scale 1.25 is kept after restart").Run(func(string, string) { done <- struct{}{} }).Once()
	23	+	notes.EXPECT().Notify("DP-2 scale saved", "Scale 2 is kept after restart").Run(func(string, string) { done <- struct{}{} }).Once()
	24	+	changes := make(chan ports.ScaleChanged)
	25	+	ctx, cancel := context.WithCancel(context.Background())
	26	+	stopped := make(chan struct{})
	27	+	go func() { core.PersistScales(ctx, changes, store, notes, 20*time.Millisecond); close(stopped) }()
	28	+	for _, ev := range []ports.ScaleChanged{{Output: "DP-2", Scale: 1.5}, {Output: "DP-1", Scale: 1.25}, {Output: "DP-2", Scale: 2}} {
	29	+	changes <- ev
	30	+	}
	31	+	receive(t, done)
	32	+	receive(t, done)
	33	+	cancel()
	34	+	<-stopped
	35	+	}
	36	+
	37	+	// A failed save is reported and not retried.
	38	+	func TestPersistScalesReportsFailure(t *testing.T) {
	39	+	store := portsmocks.NewMockOutputScaleStore(t)
	40	+	notes := portsmocks.NewMockNotifier(t)
	41	+	done := make(chan struct{}, 1)
	42	+	store.EXPECT().SaveOutputScale("DP-1", 1.5).Return(errors.New("read-only file system")).Once()
	43	+	notes.EXPECT().Notify("DP-1 scale not saved", "read-only file system").Run(func(string, string) { done <- struct{}{} }).Once()
	44	+	changes := make(chan ports.ScaleChanged)
	45	+	ctx, cancel := context.WithCancel(context.Background())
	46	+	stopped := make(chan struct{})
	47	+	go func() { core.PersistScales(ctx, changes, store, notes, time.Millisecond); close(stopped) }()
	48	+	changes <- ports.ScaleChanged{Output: "DP-1", Scale: 1.5}
	49	+	receive(t, done)
	50	+	cancel()
	51	+	<-stopped
	52	+	}
	53	+
	54	+	// Scale binds report the new scale of the focused output; a bind at the end
	55	+	// of the range changes nothing and reports nothing.
	56	+	func TestScaleBindReportsScale(t *testing.T) {
	57	+	cfg := config.Defaults()
	58	+	input := make(chan ports.InputEvent, 8)
	59	+	output := make(chan ports.OutputEvent, 8)
	60	+	scales := make(chan ports.ScaleChanged, 8)
	61	+	scenes := make(chan []ports.Scene, 1)
	62	+	c, err := core.New(cfg, core.Channels{Input: input, Output: output, Commands: make(chan ports.ClientCommand, 64), Scenes: scenes, Scales: scales})
	63	+	if err != nil {
	64	+	t.Fatal(err)
	65	+	}
	66	+	ctx, cancel := context.WithCancel(context.Background())
	67	+	defer cancel()
	68	+	go c.Run(ctx)
	69	+	output <- ports.OutputAdded{Info: ports.OutputInfo{Name: "DP-2", Width: 5120, Height: 2160}}
	70	+	scene(t, scenes)
	71	+	press := func(sym string, code uint32) {
	72	+	input <- ports.KeyEvent{Keysym: sym, Keycode: code, Mods: ports.ModSuper, Pressed: true}
	73	+	input <- ports.KeyEvent{Keysym: sym, Keycode: code, Mods: ports.ModSuper}
	74	+	}
	75	+	press("minus", 12) // already at 1
	76	+	press("equal", 13)
	77	+	if got := receive(t, scales); got.Output != "DP-2" \|\| got.Scale <= 1 {
	78	+	t.Fatalf("%+v", got)
	79	+	}
	80	+	if len(scales) != 0 {
	81	+	t.Fatalf("scale-down at 1 reported %+v", <-scales)
	82	+	}
	83	+	}

@@ -0,0 +1,83 @@
	1	+	package core_test
	2	+
	3	+	import (
	4	+	"context"
	5	+	"errors"
	6	+	"testing"
	7	+	"time"
	8	+
	9	+	"github.com/bnema/neferwl/internal/adapters/config"
	10	+	"github.com/bnema/neferwl/internal/core"
	11	+	portsmocks "github.com/bnema/neferwl/internal/mocks/ports"
	12	+	"github.com/bnema/neferwl/internal/ports"
	13	+	)
	14	+
	15	+	// A burst of scale changes saves only the last scale of each output, once.
	16	+	func TestPersistScalesDebounces(t *testing.T) {
	17	+	store := portsmocks.NewMockOutputScaleStore(t)
	18	+	notes := portsmocks.NewMockNotifier(t)
	19	+	done := make(chan struct{}, 2)
	20	+	store.EXPECT().SaveOutputScale("DP-1", 1.25).Return(nil).Once()
	21	+	store.EXPECT().SaveOutputScale("DP-2", 2.0).Return(nil).Once()
	22	+	notes.EXPECT().Notify("DP-1 scale saved", "Scale 1.25 is kept after restart").Run(func(string, string) { done <- struct{}{} }).Once()
	23	+	notes.EXPECT().Notify("DP-2 scale saved", "Scale 2 is kept after restart").Run(func(string, string) { done <- struct{}{} }).Once()
	24	+	changes := make(chan ports.ScaleChanged)
	25	+	ctx, cancel := context.WithCancel(context.Background())
	26	+	stopped := make(chan struct{})
	27	+	go func() { core.PersistScales(ctx, changes, store, notes, 20*time.Millisecond); close(stopped) }()
	28	+	for _, ev := range []ports.ScaleChanged{{Output: "DP-2", Scale: 1.5}, {Output: "DP-1", Scale: 1.25}, {Output: "DP-2", Scale: 2}} {
	29	+	changes <- ev
	30	+	}
	31	+	receive(t, done)
	32	+	receive(t, done)
	33	+	cancel()
	34	+	<-stopped
	35	+	}
	36	+
	37	+	// A failed save is reported and not retried.
	38	+	func TestPersistScalesReportsFailure(t *testing.T) {
	39	+	store := portsmocks.NewMockOutputScaleStore(t)
	40	+	notes := portsmocks.NewMockNotifier(t)
	41	+	done := make(chan struct{}, 1)
	42	+	store.EXPECT().SaveOutputScale("DP-1", 1.5).Return(errors.New("read-only file system")).Once()
	43	+	notes.EXPECT().Notify("DP-1 scale not saved", "read-only file system").Run(func(string, string) { done <- struct{}{} }).Once()
	44	+	changes := make(chan ports.ScaleChanged)
	45	+	ctx, cancel := context.WithCancel(context.Background())
	46	+	stopped := make(chan struct{})
	47	+	go func() { core.PersistScales(ctx, changes, store, notes, time.Millisecond); close(stopped) }()
	48	+	changes <- ports.ScaleChanged{Output: "DP-1", Scale: 1.5}
	49	+	receive(t, done)
	50	+	cancel()
	51	+	<-stopped
	52	+	}
	53	+
	54	+	// Scale binds report the new scale of the focused output; a bind at the end
	55	+	// of the range changes nothing and reports nothing.
	56	+	func TestScaleBindReportsScale(t *testing.T) {
	57	+	cfg := config.Defaults()
	58	+	input := make(chan ports.InputEvent, 8)
	59	+	output := make(chan ports.OutputEvent, 8)
	60	+	scales := make(chan ports.ScaleChanged, 8)
	61	+	scenes := make(chan []ports.Scene, 1)
	62	+	c, err := core.New(cfg, core.Channels{Input: input, Output: output, Commands: make(chan ports.ClientCommand, 64), Scenes: scenes, Scales: scales})
	63	+	if err != nil {
	64	+	t.Fatal(err)
	65	+	}
	66	+	ctx, cancel := context.WithCancel(context.Background())
	67	+	defer cancel()
	68	+	go c.Run(ctx)
	69	+	output <- ports.OutputAdded{Info: ports.OutputInfo{Name: "DP-2", Width: 5120, Height: 2160}}
	70	+	scene(t, scenes)
	71	+	press := func(sym string, code uint32) {
	72	+	input <- ports.KeyEvent{Keysym: sym, Keycode: code, Mods: ports.ModSuper, Pressed: true}
	73	+	input <- ports.KeyEvent{Keysym: sym, Keycode: code, Mods: ports.ModSuper}
	74	+	}
	75	+	press("minus", 12) // already at 1
	76	+	press("equal", 13)
	77	+	if got := receive(t, scales); got.Output != "DP-2" \|\| got.Scale <= 1 {
	78	+	t.Fatalf("%+v", got)
	79	+	}
	80	+	if len(scales) != 0 {
	81	+	t.Fatalf("scale-down at 1 reported %+v", <-scales)
	82	+	}
	83	+	}

A internal/mocks/ports/desktop_mock.go +184 -0

@@ -0,0 +1,184 @@
	1	+	// Code generated by mockery; DO NOT EDIT.
	2	+	// github.com/vektra/mockery
	3	+	// template: testify
	4	+
	5	+	package portsmocks
	6	+
	7	+	import (
	8	+	mock "github.com/stretchr/testify/mock"
	9	+	)
	10	+
	11	+	// NewMockNotifier creates a new instance of MockNotifier. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
	12	+	// The first argument is typically a *testing.T value.
	13	+	func NewMockNotifier(t interface {
	14	+	mock.TestingT
	15	+	Cleanup(func())
	16	+	}) *MockNotifier {
	17	+	if helper, ok := t.(interface{ Helper() }); ok {
	18	+	helper.Helper()
	19	+	}
	20	+
	21	+	mock := &MockNotifier{}
	22	+	mock.Mock.Test(t)
	23	+
	24	+	t.Cleanup(func() {
	25	+	if helper, ok := t.(interface{ Helper() }); ok {
	26	+	helper.Helper()
	27	+	}
	28	+	mock.AssertExpectations(t)
	29	+	})
	30	+
	31	+	return mock
	32	+	}
	33	+
	34	+	// MockNotifier is an autogenerated mock type for the Notifier type
	35	+	type MockNotifier struct {
	36	+	mock.Mock
	37	+	}
	38	+
	39	+	type MockNotifier_Expecter struct {
	40	+	mock *mock.Mock
	41	+	}
	42	+
	43	+	func (_m MockNotifier) EXPECT() MockNotifier_Expecter {
	44	+	return &MockNotifier_Expecter{mock: &_m.Mock}
	45	+	}
	46	+
	47	+	// Notify provides a mock function for the type MockNotifier
	48	+	func (_mock *MockNotifier) Notify(summary string, body string) {
	49	+	_mock.Called(summary, body)
	50	+	return
	51	+	}
	52	+
	53	+	// MockNotifier_Notify_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Notify'
	54	+	type MockNotifier_Notify_Call struct {
	55	+	*mock.Call
	56	+	}
	57	+
	58	+	// Notify is a helper method to define mock.On call
	59	+	// - summary string
	60	+	// - body string
	61	+	func (_e MockNotifier_Expecter) Notify(summary any, body any) MockNotifier_Notify_Call {
	62	+	return &MockNotifier_Notify_Call{Call: _e.mock.On("Notify", summary, body)}
	63	+	}
	64	+
	65	+	func (_c MockNotifier_Notify_Call) Run(run func(summary string, body string)) MockNotifier_Notify_Call {
	66	+	_c.Call.Run(func(args mock.Arguments) {
	67	+	var arg0 string
	68	+	if args[0] != nil {
	69	+	arg0 = args[0].(string)
	70	+	}
	71	+	var arg1 string
	72	+	if args[1] != nil {
	73	+	arg1 = args[1].(string)
	74	+	}
	75	+	run(
	76	+	arg0,
	77	+	arg1,
	78	+	)
	79	+	})
	80	+	return _c
	81	+	}
	82	+
	83	+	func (_c MockNotifier_Notify_Call) Return() MockNotifier_Notify_Call {
	84	+	_c.Call.Return()
	85	+	return _c
	86	+	}
	87	+
	88	+	func (_c MockNotifier_Notify_Call) RunAndReturn(run func(summary string, body string)) MockNotifier_Notify_Call {
	89	+	_c.Run(run)
	90	+	return _c
	91	+	}
	92	+
	93	+	// NewMockOutputScaleStore creates a new instance of MockOutputScaleStore. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
	94	+	// The first argument is typically a *testing.T value.
	95	+	func NewMockOutputScaleStore(t interface {
	96	+	mock.TestingT
	97	+	Cleanup(func())
	98	+	}) *MockOutputScaleStore {
	99	+	if helper, ok := t.(interface{ Helper() }); ok {
	100	+	helper.Helper()
	101	+	}
	102	+
	103	+	mock := &MockOutputScaleStore{}
	104	+	mock.Mock.Test(t)
	105	+
	106	+	t.Cleanup(func() {
	107	+	if helper, ok := t.(interface{ Helper() }); ok {
	108	+	helper.Helper()
	109	+	}
	110	+	mock.AssertExpectations(t)
	111	+	})
	112	+
	113	+	return mock
	114	+	}
	115	+
	116	+	// MockOutputScaleStore is an autogenerated mock type for the OutputScaleStore type
	117	+	type MockOutputScaleStore struct {
	118	+	mock.Mock
	119	+	}
	120	+
	121	+	type MockOutputScaleStore_Expecter struct {
	122	+	mock *mock.Mock
	123	+	}
	124	+
	125	+	func (_m MockOutputScaleStore) EXPECT() MockOutputScaleStore_Expecter {
	126	+	return &MockOutputScaleStore_Expecter{mock: &_m.Mock}
	127	+	}
	128	+
	129	+	// SaveOutputScale provides a mock function for the type MockOutputScaleStore
	130	+	func (_mock *MockOutputScaleStore) SaveOutputScale(output string, scale float64) error {
	131	+	ret := _mock.Called(output, scale)
	132	+
	133	+	if len(ret) == 0 {
	134	+	panic("no return value specified for SaveOutputScale")
	135	+	}
	136	+
	137	+	var r0 error
	138	+	if returnFunc, ok := ret.Get(0).(func(string, float64) error); ok {
	139	+	r0 = returnFunc(output, scale)
	140	+	} else {
	141	+	r0 = ret.Error(0)
	142	+	}
	143	+	return r0
	144	+	}
	145	+
	146	+	// MockOutputScaleStore_SaveOutputScale_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'SaveOutputScale'
	147	+	type MockOutputScaleStore_SaveOutputScale_Call struct {
	148	+	*mock.Call
	149	+	}
	150	+
	151	+	// SaveOutputScale is a helper method to define mock.On call
	152	+	// - output string
	153	+	// - scale float64
	154	+	func (_e MockOutputScaleStore_Expecter) SaveOutputScale(output any, scale any) MockOutputScaleStore_SaveOutputScale_Call {
	155	+	return &MockOutputScaleStore_SaveOutputScale_Call{Call: _e.mock.On("SaveOutputScale", output, scale)}
	156	+	}
	157	+
	158	+	func (_c MockOutputScaleStore_SaveOutputScale_Call) Run(run func(output string, scale float64)) MockOutputScaleStore_SaveOutputScale_Call {
	159	+	_c.Call.Run(func(args mock.Arguments) {
	160	+	var arg0 string
	161	+	if args[0] != nil {
	162	+	arg0 = args[0].(string)
	163	+	}
	164	+	var arg1 float64
	165	+	if args[1] != nil {
	166	+	arg1 = args[1].(float64)
	167	+	}
	168	+	run(
	169	+	arg0,
	170	+	arg1,
	171	+	)
	172	+	})
	173	+	return _c
	174	+	}
	175	+
	176	+	func (_c MockOutputScaleStore_SaveOutputScale_Call) Return(err error) MockOutputScaleStore_SaveOutputScale_Call {
	177	+	_c.Call.Return(err)
	178	+	return _c
	179	+	}
	180	+
	181	+	func (_c MockOutputScaleStore_SaveOutputScale_Call) RunAndReturn(run func(output string, scale float64) error) MockOutputScaleStore_SaveOutputScale_Call {
	182	+	_c.Call.Return(run)
	183	+	return _c
	184	+	}

@@ -0,0 +1,184 @@
	1	+	// Code generated by mockery; DO NOT EDIT.
	2	+	// github.com/vektra/mockery
	3	+	// template: testify
	4	+
	5	+	package portsmocks
	6	+
	7	+	import (
	8	+	mock "github.com/stretchr/testify/mock"
	9	+	)
	10	+
	11	+	// NewMockNotifier creates a new instance of MockNotifier. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
	12	+	// The first argument is typically a *testing.T value.
	13	+	func NewMockNotifier(t interface {
	14	+	mock.TestingT
	15	+	Cleanup(func())
	16	+	}) *MockNotifier {
	17	+	if helper, ok := t.(interface{ Helper() }); ok {
	18	+	helper.Helper()
	19	+	}
	20	+
	21	+	mock := &MockNotifier{}
	22	+	mock.Mock.Test(t)
	23	+
	24	+	t.Cleanup(func() {
	25	+	if helper, ok := t.(interface{ Helper() }); ok {
	26	+	helper.Helper()
	27	+	}
	28	+	mock.AssertExpectations(t)
	29	+	})
	30	+
	31	+	return mock
	32	+	}
	33	+
	34	+	// MockNotifier is an autogenerated mock type for the Notifier type
	35	+	type MockNotifier struct {
	36	+	mock.Mock
	37	+	}
	38	+
	39	+	type MockNotifier_Expecter struct {
	40	+	mock *mock.Mock
	41	+	}
	42	+
	43	+	func (_m MockNotifier) EXPECT() MockNotifier_Expecter {
	44	+	return &MockNotifier_Expecter{mock: &_m.Mock}
	45	+	}
	46	+
	47	+	// Notify provides a mock function for the type MockNotifier
	48	+	func (_mock *MockNotifier) Notify(summary string, body string) {
	49	+	_mock.Called(summary, body)
	50	+	return
	51	+	}
	52	+
	53	+	// MockNotifier_Notify_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Notify'
	54	+	type MockNotifier_Notify_Call struct {
	55	+	*mock.Call
	56	+	}
	57	+
	58	+	// Notify is a helper method to define mock.On call
	59	+	// - summary string
	60	+	// - body string
	61	+	func (_e MockNotifier_Expecter) Notify(summary any, body any) MockNotifier_Notify_Call {
	62	+	return &MockNotifier_Notify_Call{Call: _e.mock.On("Notify", summary, body)}
	63	+	}
	64	+
	65	+	func (_c MockNotifier_Notify_Call) Run(run func(summary string, body string)) MockNotifier_Notify_Call {
	66	+	_c.Call.Run(func(args mock.Arguments) {
	67	+	var arg0 string
	68	+	if args[0] != nil {
	69	+	arg0 = args[0].(string)
	70	+	}
	71	+	var arg1 string
	72	+	if args[1] != nil {
	73	+	arg1 = args[1].(string)
	74	+	}
	75	+	run(
	76	+	arg0,
	77	+	arg1,
	78	+	)
	79	+	})
	80	+	return _c
	81	+	}
	82	+
	83	+	func (_c MockNotifier_Notify_Call) Return() MockNotifier_Notify_Call {
	84	+	_c.Call.Return()
	85	+	return _c
	86	+	}
	87	+
	88	+	func (_c MockNotifier_Notify_Call) RunAndReturn(run func(summary string, body string)) MockNotifier_Notify_Call {
	89	+	_c.Run(run)
	90	+	return _c
	91	+	}
	92	+
	93	+	// NewMockOutputScaleStore creates a new instance of MockOutputScaleStore. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
	94	+	// The first argument is typically a *testing.T value.
	95	+	func NewMockOutputScaleStore(t interface {
	96	+	mock.TestingT
	97	+	Cleanup(func())
	98	+	}) *MockOutputScaleStore {
	99	+	if helper, ok := t.(interface{ Helper() }); ok {
	100	+	helper.Helper()
	101	+	}
	102	+
	103	+	mock := &MockOutputScaleStore{}
	104	+	mock.Mock.Test(t)
	105	+
	106	+	t.Cleanup(func() {
	107	+	if helper, ok := t.(interface{ Helper() }); ok {
	108	+	helper.Helper()
	109	+	}
	110	+	mock.AssertExpectations(t)
	111	+	})
	112	+
	113	+	return mock
	114	+	}
	115	+
	116	+	// MockOutputScaleStore is an autogenerated mock type for the OutputScaleStore type
	117	+	type MockOutputScaleStore struct {
	118	+	mock.Mock
	119	+	}
	120	+
	121	+	type MockOutputScaleStore_Expecter struct {
	122	+	mock *mock.Mock
	123	+	}
	124	+
	125	+	func (_m MockOutputScaleStore) EXPECT() MockOutputScaleStore_Expecter {
	126	+	return &MockOutputScaleStore_Expecter{mock: &_m.Mock}
	127	+	}
	128	+
	129	+	// SaveOutputScale provides a mock function for the type MockOutputScaleStore
	130	+	func (_mock *MockOutputScaleStore) SaveOutputScale(output string, scale float64) error {
	131	+	ret := _mock.Called(output, scale)
	132	+
	133	+	if len(ret) == 0 {
	134	+	panic("no return value specified for SaveOutputScale")
	135	+	}
	136	+
	137	+	var r0 error
	138	+	if returnFunc, ok := ret.Get(0).(func(string, float64) error); ok {
	139	+	r0 = returnFunc(output, scale)
	140	+	} else {
	141	+	r0 = ret.Error(0)
	142	+	}
	143	+	return r0
	144	+	}
	145	+
	146	+	// MockOutputScaleStore_SaveOutputScale_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'SaveOutputScale'
	147	+	type MockOutputScaleStore_SaveOutputScale_Call struct {
	148	+	*mock.Call
	149	+	}
	150	+
	151	+	// SaveOutputScale is a helper method to define mock.On call
	152	+	// - output string
	153	+	// - scale float64
	154	+	func (_e MockOutputScaleStore_Expecter) SaveOutputScale(output any, scale any) MockOutputScaleStore_SaveOutputScale_Call {
	155	+	return &MockOutputScaleStore_SaveOutputScale_Call{Call: _e.mock.On("SaveOutputScale", output, scale)}
	156	+	}
	157	+
	158	+	func (_c MockOutputScaleStore_SaveOutputScale_Call) Run(run func(output string, scale float64)) MockOutputScaleStore_SaveOutputScale_Call {
	159	+	_c.Call.Run(func(args mock.Arguments) {
	160	+	var arg0 string
	161	+	if args[0] != nil {
	162	+	arg0 = args[0].(string)
	163	+	}
	164	+	var arg1 float64
	165	+	if args[1] != nil {
	166	+	arg1 = args[1].(float64)
	167	+	}
	168	+	run(
	169	+	arg0,
	170	+	arg1,
	171	+	)
	172	+	})
	173	+	return _c
	174	+	}
	175	+
	176	+	func (_c MockOutputScaleStore_SaveOutputScale_Call) Return(err error) MockOutputScaleStore_SaveOutputScale_Call {
	177	+	_c.Call.Return(err)
	178	+	return _c
	179	+	}
	180	+
	181	+	func (_c MockOutputScaleStore_SaveOutputScale_Call) RunAndReturn(run func(output string, scale float64) error) MockOutputScaleStore_SaveOutputScale_Call {
	182	+	_c.Call.Return(run)
	183	+	return _c
	184	+	}

A internal/ports/desktop.go +13 -0

@@ -0,0 +1,13 @@
	1	+	package ports
	2	+
	3	+	// Notifier shows desktop notifications (e.g. through mako). Notify does not
	4	+	// block; delivery is best effort and implementations log their own failures.
	5	+	type Notifier interface {
	6	+	Notify(summary, body string)
	7	+	}
	8	+
	9	+	// OutputScaleStore persists output scales so they survive a restart.
	10	+	type OutputScaleStore interface {
	11	+	// SaveOutputScale records scale as the configured scale of the output.
	12	+	SaveOutputScale(output string, scale float64) error
	13	+	}

@@ -0,0 +1,13 @@
	1	+	package ports
	2	+
	3	+	// Notifier shows desktop notifications (e.g. through mako). Notify does not
	4	+	// block; delivery is best effort and implementations log their own failures.
	5	+	type Notifier interface {
	6	+	Notify(summary, body string)
	7	+	}
	8	+
	9	+	// OutputScaleStore persists output scales so they survive a restart.
	10	+	type OutputScaleStore interface {
	11	+	// SaveOutputScale records scale as the configured scale of the output.
	12	+	SaveOutputScale(output string, scale float64) error
	13	+	}

M internal/ports/messages.go +6 -0


@@ -498,6 +498,12 @@ func (OutputRemoved) outputEvent() {}
498	498		// ConfigChanged carries config → core reloads.
499	499		type ConfigChanged struct{ Config Config }
500	500
	501	+	// ScaleChanged carries core → persistence a scale set by a scale bind.
	502	+	type ScaleChanged struct {
	503	+	Output string
	504	+	Scale float64
	505	+	}
	506	+
501	507		// ClientCommand carries core → wayland commands.
502	508		type ClientCommand interface{ clientCommand() }
503	509


@@ -498,6 +498,12 @@ func (OutputRemoved) outputEvent() {}
498	// ConfigChanged carries config → core reloads.	498		// ConfigChanged carries config → core reloads.
499	type ConfigChanged struct{ Config Config }	499		type ConfigChanged struct{ Config Config }
500		500
		501	+	// ScaleChanged carries core → persistence a scale set by a scale bind.
		502	+	type ScaleChanged struct {
		503	+	Output string
		504	+	Scale float64
		505	+	}
		506	+
501	// ClientCommand carries core → wayland commands.	507		// ClientCommand carries core → wayland commands.
502	type ClientCommand interface{ clientCommand() }	508		type ClientCommand interface{ clientCommand() }
503		509