view.go RawHistoryFolder

1package tui
2
3import (
4	"encoding/json"
5	"fmt"
6	"os"
7	"regexp"
8	"strconv"
9	"strings"
10	"unicode/utf8"
11
12	"github.com/mattn/go-runewidth"
13	"github.com/patriceckhart/zot/packages/provider"
14)
15
16// expandTabs replaces tab characters with 4 spaces so code from
17// tab-indented languages (Go, Makefiles, etc.) renders at a
18// consistent width instead of the terminal's default 8-column tabs.
19func expandTabs(s string) string {
20	return strings.ReplaceAll(s, "\t", "    ")
21}
22
23// sanitizeUserBubbleLine prepares a single user-bubble row for safe
24// rendering. Pasted content from another terminal can contain
25// embedded ANSI escape sequences, control bytes, and tabs that
26// either reset the bubble's background colour or move the cursor in
27// ways that break the bubble's painted column.
28func sanitizeUserBubbleLine(s string) string {
29	if s == "" {
30		return s
31	}
32	s = expandTabs(s)
33	var b strings.Builder
34	b.Grow(len(s))
35	for i := 0; i < len(s); {
36		c := s[i]
37		if c == 0x1b { // ESC: drop CSI/OSC/DCS and simple escapes.
38			i = skipEscapeSequence(s, i)
39			continue
40		}
41		if c == '\r' || c == '\b' || c == 0x07 {
42			i++
43			continue
44		}
45		if c < 0x20 || c == 0x7f {
46			i++
47			continue
48		}
49		b.WriteByte(c)
50		i++
51	}
52	return b.String()
53}
54
55// pathFromToolArgs returns the "path" argument from a tool_call's
56// JSON arguments, or "" if the args aren't a JSON object or don't
57// include one. Used to pick a syntax language for rendering the
58// corresponding tool_result.
59func pathFromToolArgs(raw json.RawMessage) string {
60	if len(raw) == 0 {
61		return ""
62	}
63	var m map[string]any
64	if err := json.Unmarshal(raw, &m); err != nil {
65		return ""
66	}
67	for _, k := range []string{"path", "file_path"} {
68		if s, ok := m[k].(string); ok && s != "" {
69			return s
70		}
71	}
72	return ""
73}
74
75// offsetFromToolArgs returns the read tool's 1-indexed `offset`
76// arg (the first line of the slice the tool was asked to return),
77// or 0 when the call didn't specify one. Used by the tui to draw
78// the line-number gutter aligned to the right starting row, even
79// though the tool's text content itself no longer carries line
80// numbers.
81func offsetFromToolArgs(raw json.RawMessage) int {
82	if len(raw) == 0 {
83		return 0
84	}
85	var m map[string]any
86	if err := json.Unmarshal(raw, &m); err != nil {
87		return 0
88	}
89	switch v := m["offset"].(type) {
90	case float64:
91		return int(v)
92	case int:
93		return v
94	}
95	return 0
96}
97
98// osUserHomeDir is aliased so the test file can swap it.
99var osUserHomeDir = os.UserHomeDir
100
101// View turns a transcript + live state into a slice of styled lines,
102// already wrapped to width.
103type View struct {
104	Theme      Theme
105	ImageProto ImageProtocol // how to render inline images in this terminal
106	Messages   []provider.Message
107	// toolPaths maps tool_use_id to the "path" argument of the call, if
108	// any, so tool_result rendering can pick the right syntax language.
109	// Rebuilt on each Build().
110	toolPaths map[string]string
111	// toolStartLines maps tool_use_id to the 1-indexed first line
112	// number of a `read` result, pulled from the call's offset arg.
113	// Used by renderNumberedFile to draw a line-number gutter over
114	// raw (unnumbered) file content the model receives. Rebuilt on
115	// each Build().
116	toolStartLines map[string]int
117	// toolCallLabels maps tool_use_id to the box label (tool name +
118	// short args) for the call, so a tool_result message can render
119	// the box top edge without having to look back at the assistant
120	// message that originated the call. Rebuilt on each Build().
121	toolCallLabels  map[string]string
122	Streaming       string // current assistant text delta
123	StreamingActive bool
124	ToolCalls       []ToolCallView // tool calls in flight or completed
125	StatusLine      string
126	Err             string
127
128	// ExpandAll forces every long tool result to render in full.
129	// Toggled from the tui by ctrl+o. When false, results longer than
130	// ToolCollapseLines collapse to ToolCollapsePreview lines plus a
131	// "... (N more lines, M total, ctrl+o to expand)" footer.
132	ExpandAll bool
133
134	// renderCache holds the per-message rendered line slices so Build
135	// doesn't re-markdown every message on every frame. Keyed by a
136	// struct of (content hash, width, expandAll) — any of those
137	// changing invalidates the entry. Messages are append-only after
138	// they finalise so keeping the cache across turns is safe.
139	//
140	// Streaming/in-flight work (v.Streaming, v.ToolCalls) is never
141	// cached because it changes every delta.
142	renderCache map[msgCacheKey][]string
143
144	// TailLimit caps how many messages from the END of Messages are
145	// rendered. Messages older than the limit emit a zero-row slice
146	// so first paint after a session resume doesn't pay the markdown
147	// / chroma cost for the entire transcript at once. 0 means no
148	// limit (render everything, the historical behaviour). Interactive
149	// raises the cap when the user scrolls past the top of the
150	// already-rendered tail.
151	TailLimit int
152}
153
154// msgCacheKey identifies a cached message render. hash is a 64-bit
155// FNV-1a of the message's content, which is cheap to compute and
156// unambiguous enough for the cache (collisions produce a stale frame,
157// not wrong data, and we recompute on invalidation anyway).
158type msgCacheKey struct {
159	hash      uint64
160	width     int
161	expandAll bool
162	// turnOpen is true when the previous rendered message belongs to
163	// the same agent turn (assistant tool_use, or tool result). The
164	// header ("▍ zot") is suppressed in that case so a single turn
165	// — even one that spans many assistant/tool message round-trips
166	// in the underlying API — renders under one header instead of a
167	// new one per assistant message.
168	turnOpen bool
169}
170
171// InvalidateRenderCache drops all cached message renders. The tui
172// calls this when the transcript is replaced wholesale (/compact,
173// /clear, session swap) since messages can be replaced in place and
174// a content-hash miss alone doesn't reclaim the old entries.
175func (v *View) InvalidateRenderCache() {
176	v.renderCache = nil
177}
178
179// ToolCollapsePreview is the number of lines shown before a long tool
180// result is replaced with a "... ctrl+o to expand" footer. Tool
181// results shorter than ToolCollapseLines always render in full.
182const (
183	ToolCollapsePreview = 10
184	ToolCollapseLines   = 12
185)
186
187// ToolCallView is a pending tool invocation plus optional result.
188type ToolCallView struct {
189	ID     string
190	Name   string
191	Args   string // rendered argument summary
192	Result string // rendered result preview (truncated)
193	Error  bool
194	Done   bool
195
196	// Streaming is true while the model is still typing the tool
197	// call's JSON arguments. The TUI renders a live preview of any
198	// interesting string fields (for `write`, the `content`; for
199	// `bash`, the `command`) so the user can watch the file being
200	// composed. Set to false as soon as EvToolUseEnd arrives.
201	Streaming bool
202
203	// RawJSONBuf is the accumulator of every EvToolUseArgs delta
204	// the stream has delivered for this tool call. Used by the
205	// partial-JSON extractor to peel off the live string value
206	// of one named field on each render.
207	RawJSONBuf string
208
209	// LivePath is the `path` arg extracted as soon as it parses
210	// out of RawJSONBuf. Shown next to the tool name in the header
211	// so the user can see which file is being written to.
212	LivePath string
213}
214
215// MessageAnchor records where a rendered message starts in the chat
216// line slice. Used by /jump so the dialog can scroll the viewport to
217// the row where a turn's user prompt begins.
218type MessageAnchor struct {
219	MessageIdx int // index into v.Messages
220	Row        int // first row of that message in the Build() output
221}
222
223// Build returns the chat log lines for the given width.
224func (v *View) Build(width int) []string {
225	lines, _ := v.BuildWithAnchors(width)
226	return lines
227}
228
229// BuildLive renders only in-flight assistant/tool/error state. Main-screen
230// scrollback renderers can keep these rows outside the immutable transcript
231// so native scrolling stays stable while a turn streams.
232func (v *View) BuildLive(width int) []string {
233	var out []string
234	if v.StreamingActive && strings.TrimSpace(v.Streaming) != "" {
235		const indent = "  "
236		inner := assistantBodyWidth(width - len(indent))
237		md := RenderMarkdown(v.Streaming, v.Theme, inner)
238		for _, l := range strings.Split(md, "\n") {
239			for _, w := range wrapANSILine(l, inner) {
240				out = append(out, indent+w)
241			}
242		}
243		// out = append(out, "")
244	}
245	finalised := map[string]bool{}
246	for _, m := range v.Messages {
247		for _, c := range m.Content {
248			if b, ok := c.(provider.ToolResultBlock); ok {
249				finalised[b.CallID] = true
250			}
251		}
252	}
253	insertedToolGap := false
254	for _, tc := range v.ToolCalls {
255		if finalised[tc.ID] {
256			continue
257		}
258		if !insertedToolGap && len(out) > 0 {
259			out = append(out, "")
260		}
261		insertedToolGap = true
262		out = append(out, v.renderToolCall(tc, width)...)
263		// out = append(out, "")
264	}
265	if v.Err != "" {
266		out = append(out, v.renderErr(width)...)
267		// out = append(out, "")
268	}
269	return out
270}
271
272// renderErr formats v.Err into one or more colored rows, word-wrapped
273// to width so long provider error messages (e.g. a Bedrock 400 with an
274// embedded JSON body) aren't cut off at the terminal edge. The first
275// row carries the "✖ " marker; continuation rows align under the text
276// with a two-cell indent.
277func (v *View) renderErr(width int) []string {
278	const marker = "✖ "
279	const indent = "  "
280	wrapWidth := width - len([]rune(marker))
281	if wrapWidth < 8 {
282		wrapWidth = 8
283	}
284	wrapped := wrapLine(v.Err, wrapWidth, "")
285	if len(wrapped) == 0 {
286		wrapped = []string{""}
287	}
288	out := make([]string, 0, len(wrapped))
289	for idx, line := range wrapped {
290		prefix := marker
291		if idx > 0 {
292			prefix = indent
293		}
294		out = append(out, v.Theme.FG256(v.Theme.Error, prefix+line))
295	}
296	return out
297}
298
299// BuildWithAnchors is like Build but additionally reports the first
300// row occupied by each message in v.Messages. Callers that need to
301// scroll to a specific turn (the /jump dialog) use the anchor slice
302// to map a message index back to a row offset.
303func (v *View) BuildWithAnchors(width int) ([]string, []MessageAnchor) {
304	v.refreshToolPaths()
305	if v.renderCache == nil {
306		v.renderCache = make(map[msgCacheKey][]string)
307	}
308
309	// Pre-render every message (hits the cache for unchanged ones) so
310	// we can allocate `out` in a single shot with the exact capacity.
311	// Growing via append on a long transcript copies the backing array
312	// log2(N) times; for a 2000-line scrollback that's enough memcpy
313	// to visibly stutter while typing.
314	rendered := make([][]string, len(v.Messages))
315	total := 0
316	// renderFrom is the first index we actually render. Anything
317	// below it emits a zero-row placeholder; the message still gets
318	// an anchor entry so /jump and scroll math keep working, and a
319	// later Build with a higher TailLimit fills the gap.
320	renderFrom := 0
321	if v.TailLimit > 0 && len(v.Messages) > v.TailLimit {
322		renderFrom = len(v.Messages) - v.TailLimit
323	}
324	for idx, m := range v.Messages {
325		if idx < renderFrom {
326			rendered[idx] = nil
327			continue
328		}
329		// A turn is "open" once the assistant has started responding
330		// to the most recent user prompt. Walk back over consecutive
331		// assistant/tool messages: if any non-user message precedes
332		// this one without a user message in between, we're inside
333		// the same turn and should not draw a new "▍ zot" header.
334		turnOpen := false
335		if m.Role == provider.RoleAssistant {
336			for j := idx - 1; j >= 0; j-- {
337				prev := v.Messages[j]
338				// Skip compaction summary messages — they're
339				// rendered as a muted footer line (or hidden
340				// entirely when collapsed) and don't open a turn.
341				if prev.Meta["compaction"] == "true" {
342					continue
343				}
344				if prev.Role == provider.RoleAssistant || prev.Role == provider.RoleTool {
345					turnOpen = true
346				}
347				break
348			}
349		}
350		lines := v.renderMessageCached(m, width, turnOpen)
351		rendered[idx] = lines
352		total += len(lines) + 1 // +1 for the blank separator row
353	}
354
355	out := make([]string, 0, total+16)
356	anchors := make([]MessageAnchor, 0, len(v.Messages))
357	for idx := range v.Messages {
358		anchors = append(anchors, MessageAnchor{MessageIdx: idx, Row: len(out)})
359		out = append(out, rendered[idx]...)
360		// Skip the inter-message blank for messages that rendered
361		// to nothing. An assistant message whose only content is
362		// ToolCallBlock(s) has no rendered output of its own (each
363		// tool result owns its box now), so emitting a blank for it
364		// would compound with the blank from the next real message
365		// and produce two blank rows between adjacent tool boxes.
366		if len(rendered[idx]) == 0 {
367			continue
368		}
369		out = append(out, "")
370	}
371	// Only render the streaming header/body when there's actual
372	// text to show. An empty streaming block (streamOn=true,
373	// Streaming="") appears when a turn starts with a tool_use
374	// block instead of text — in that case the live tool-call
375	// overlay below is the real content and a naked "zot" bar
376	// above it reads as a stray empty message.
377	if v.StreamingActive && strings.TrimSpace(v.Streaming) != "" {
378		// Stream the partial assistant text through the same markdown
379		// renderer used for finalised messages so code fences, diffs,
380		// lists, and inline styles look the same while streaming and
381		// don't suddenly reflow when the turn ends. No speaker header
382		// is drawn; the indent matches the finalised assistant body in
383		// renderMessage so the column stays consistent across the
384		// stream/finalise transition. Width is capped so ultra-wide
385		// terminals don't produce edge-to-edge code-fence rules or
386		// unreadably long prose lines.
387		const indent = "  "
388		inner := assistantBodyWidth(width - len(indent))
389		md := RenderMarkdown(v.Streaming, v.Theme, inner)
390		for _, l := range strings.Split(md, "\n") {
391			for _, w := range wrapANSILine(l, inner) {
392				out = append(out, indent+w)
393			}
394		}
395		out = append(out, "")
396	}
397	// Live tool-call overlay: keep the in-flight box visible after
398	// the assistant tool_use is appended, then hide it only when the
399	// matching tool_result reaches the transcript. Assistant tool_use
400	// blocks render no rows of their own, so suppressing the overlay
401	// at that point makes the box disappear while the tool is running.
402	finalised := map[string]bool{}
403	for _, m := range v.Messages {
404		for _, c := range m.Content {
405			if b, ok := c.(provider.ToolResultBlock); ok {
406				finalised[b.CallID] = true
407			}
408		}
409	}
410	for _, tc := range v.ToolCalls {
411		if finalised[tc.ID] {
412			continue
413		}
414		out = append(out, v.renderToolCall(tc, width)...)
415		out = append(out, "")
416	}
417	if v.Err != "" {
418		out = append(out, v.renderErr(width)...)
419		out = append(out, "")
420	}
421	return out, anchors
422}
423
424// refreshToolPaths rebuilds the tool_use_id -> path map from the
425// current transcript. Called once per Build() so tool result blocks
426// (which may be cached) can look up their syntax language when they
427// were originally rendered. Walking the transcript here is O(N) but
428// cheap compared to markdown/chroma work it enables.
429func (v *View) refreshToolPaths() {
430	v.toolPaths = map[string]string{}
431	v.toolStartLines = map[string]int{}
432	v.toolCallLabels = map[string]string{}
433	for _, m := range v.Messages {
434		for _, c := range m.Content {
435			if tc, ok := c.(provider.ToolCallBlock); ok {
436				if p := pathFromToolArgs(tc.Arguments); p != "" {
437					v.toolPaths[tc.ID] = p
438				}
439				if off := offsetFromToolArgs(tc.Arguments); off >= 1 {
440					v.toolStartLines[tc.ID] = off
441				}
442				v.toolCallLabels[tc.ID] = tc.Name + " " + ShortArgs(tc.Name, tc.Arguments)
443			}
444		}
445	}
446}
447
448// renderMessageCached returns the rendered line slice for m, using the
449// cache if the same (content hash, width, expandAll) combination has
450// been rendered before. The slice returned is shared — callers must
451// not mutate it; Build() only ever appends to its own `out` so the
452// shared slice is safe.
453func (v *View) renderMessageCached(m provider.Message, width int, turnOpen bool) []string {
454	key := msgCacheKey{
455		hash:      hashMessage(m),
456		width:     width,
457		expandAll: v.ExpandAll,
458		turnOpen:  turnOpen,
459	}
460	if v.renderCache != nil {
461		if lines, ok := v.renderCache[key]; ok {
462			return lines
463		}
464	}
465	lines := v.renderMessage(m, width, turnOpen)
466	if v.renderCache != nil {
467		// Bound the cache: 4x the current message count is enough to
468		// survive /compact churn without leaking memory across a very
469		// long session.
470		max := len(v.Messages) * 4
471		if max < 32 {
472			max = 32
473		}
474		if len(v.renderCache) > max {
475			// Drop half the entries. map iteration order gives us a
476			// pseudo-LRU for free.
477			dropped := 0
478			target := len(v.renderCache) / 2
479			for k := range v.renderCache {
480				if dropped >= target {
481					break
482				}
483				delete(v.renderCache, k)
484				dropped++
485			}
486		}
487		v.renderCache[key] = lines
488	}
489	return lines
490}
491
492// hashMessage returns a 64-bit FNV-1a over the role + content blocks
493// of m. Serialising each block to its salient bytes is enough: two
494// messages with the same role and same content render identically.
495func hashMessage(m provider.Message) uint64 {
496	h := fnv64aInit
497	h = fnv64aWrite(h, []byte(m.Role))
498	h = fnv64aWriteByte(h, 0)
499	for _, c := range m.Content {
500		switch b := c.(type) {
501		case provider.TextBlock:
502			h = fnv64aWriteByte(h, 't')
503			h = fnv64aWrite(h, []byte(b.Text))
504		case provider.ImageBlock:
505			h = fnv64aWriteByte(h, 'i')
506			h = fnv64aWrite(h, []byte(b.MimeType))
507			h = fnv64aWrite(h, b.Data)
508		case provider.ToolCallBlock:
509			h = fnv64aWriteByte(h, 'c')
510			h = fnv64aWrite(h, []byte(b.ID))
511			h = fnv64aWrite(h, []byte(b.Name))
512			h = fnv64aWrite(h, []byte(b.Arguments))
513		case provider.ToolResultBlock:
514			h = fnv64aWriteByte(h, 'r')
515			h = fnv64aWrite(h, []byte(b.CallID))
516			if b.IsError {
517				h = fnv64aWriteByte(h, 'E')
518			}
519			for _, inner := range b.Content {
520				switch ib := inner.(type) {
521				case provider.TextBlock:
522					h = fnv64aWrite(h, []byte(ib.Text))
523				case provider.ImageBlock:
524					h = fnv64aWrite(h, []byte(ib.MimeType))
525					h = fnv64aWrite(h, ib.Data)
526				}
527			}
528		}
529		h = fnv64aWriteByte(h, 0)
530	}
531	return h
532}
533
534// FNV-1a implementation inlined so we don't pay the interface cost of
535// hash.Hash64 on every Build(). The whole point here is speed.
536const (
537	fnv64aInit  uint64 = 0xcbf29ce484222325
538	fnv64aPrime uint64 = 0x100000001b3
539)
540
541// assistantBodyRightPad is the blank gutter kept on the right
542// side of every assistant prose line.
543const assistantBodyRightPad = 2
544
545// assistantBodyWidth returns the usable width for the assistant
546// message body (markdown prose + code fences). Uses the full
547// column width passed in minus assistantBodyRightPad, clamped
548// at 1 so wrap helpers don't divide by zero on absurdly narrow
549// terminals. The right-side padding keeps a small breathing
550// column to the terminal edge that mirrors the left indent.
551func assistantBodyWidth(outer int) int {
552	outer -= assistantBodyRightPad
553	if outer < 1 {
554		return 1
555	}
556	return outer
557}
558
559func fnv64aWriteByte(h uint64, b byte) uint64 {
560	h ^= uint64(b)
561	h *= fnv64aPrime
562	return h
563}
564
565func fnv64aWrite(h uint64, p []byte) uint64 {
566	for _, b := range p {
567		h ^= uint64(b)
568		h *= fnv64aPrime
569	}
570	return h
571}
572
573func (v *View) renderMessage(m provider.Message, width int, turnOpen bool) []string {
574	var lines []string
575
576	// Compaction summary: render as a single muted line at the end
577	// of the chat instead of as a user message.
578	if m.Meta["compaction"] == "true" {
579		if v.ExpandAll {
580			return v.renderCompactionBlock(m, width)
581		}
582		// Collapsed: skip entirely. The status bar shows the info.
583		return nil
584	}
585
586	switch m.Role {
587	case provider.RoleUser:
588		// User rows: no speaker label. Each line is painted with a
589		// faint bubble background tint (UserBubble) so the user's
590		// turns visually segment the chat without needing a header.
591		// One tinted blank row above and below approximates CSS
592		// padding-top / padding-bottom (terminals can't do fractional
593		// rows, so a full row of bubble-coloured whitespace is the
594		// closest analogue and gives the bubble visible breathing
595		// room).
596		// User rows: a 1-cell "▌" accent bar at column 0 painted on
597		// the bubble bg, so the bar's cell shares the panel tint and
598		// there is no visible gap between bar and panel. (Some terminals
599		// — iTerm2, Apple Terminal — may smear the cell-0 bg into the
600		// window inset to the left; that's a terminal-side rendering
601		// quirk we accept in exchange for a clean bar-to-panel join.)
602		const leftGutter = 0                               // cells of bubble bg between bar and text
603		const rightGutter = 2                              // cells of bubble bg between text and right edge
604		innerWidth := width - 2 - leftGutter - rightGutter // 2 = bar's two cells (▌ + trailing space)
605		if innerWidth < 1 {
606			innerWidth = 1
607		}
608		row := func(content string) string {
609			inner := strings.Repeat(" ", leftGutter) + content
610			padded := v.Theme.UserBubble(inner, width-2)
611			bar := v.Theme.BG(v.Theme.UserBubbleBG, v.Theme.FG256(v.Theme.Accent, "▌ "))
612			return bar + padded
613		}
614		var bubble []string
615		for _, c := range m.Content {
616			switch b := c.(type) {
617			case provider.TextBlock:
618				for _, l := range strings.Split(b.Text, "\n") {
619					l = sanitizeUserBubbleLine(l)
620					for _, w := range wrapLine(l, innerWidth, "") {
621						bubble = append(bubble, row(w))
622					}
623				}
624			case provider.ImageBlock:
625				bubble = append(bubble, row(fmt.Sprintf("[image %s, %d bytes]", b.MimeType, len(b.Data))))
626			}
627		}
628		if len(bubble) > 0 {
629			lines = append(lines, row(""))
630			lines = append(lines, bubble...)
631			lines = append(lines, row(""))
632		}
633	case provider.RoleAssistant:
634		// Assistant rows: no speaker label either. Prose still gets a
635		// small left indent so it visually aligns with tool box body
636		// content, but no "zot" header.
637		_ = turnOpen
638		const indent = "  "
639		inner := assistantBodyWidth(width - len(indent))
640		for _, c := range m.Content {
641			switch b := c.(type) {
642			case provider.TextBlock:
643				md := RenderMarkdown(strings.TrimLeft(b.Text, "\n"), v.Theme, inner)
644				for _, l := range strings.Split(md, "\n") {
645					for _, w := range wrapANSILine(l, inner) {
646						lines = append(lines, indent+w)
647					}
648				}
649			case provider.ToolCallBlock:
650				// The whole box (top + body + bottom) is rendered by
651				// the matching tool_result message so a single
652				// assistant message that batches multiple tool_use
653				// blocks doesn't produce a stack of unclosed top
654				// edges. Each tool result owns its own box.
655				_ = b
656			}
657		}
658	case provider.RoleTool:
659		for _, c := range m.Content {
660			if tr, ok := c.(provider.ToolResultBlock); ok {
661				color := v.Theme.ToolOut
662				if tr.IsError {
663					color = v.Theme.Error
664				}
665				path := ""
666				if v.toolPaths != nil {
667					path = v.toolPaths[tr.CallID]
668				}
669				startLine := 1
670				if v.toolStartLines != nil {
671					if s := v.toolStartLines[tr.CallID]; s > 0 {
672						startLine = s
673					}
674				}
675				label := ""
676				if v.toolCallLabels != nil {
677					label = v.toolCallLabels[tr.CallID]
678				}
679				// Each tool result owns a complete box: top edge with
680				// the call's label, body rows wrapped in vertical
681				// edges, bottom edge to close. The label is looked up
682				// from the matching ToolCallBlock so multiple calls
683				// in one assistant message render as N adjacent boxes
684				// instead of stacking unclosed top edges.
685				lines = append(lines, toolBoxTop(v.Theme, label, width))
686				lines = append(lines, toolBoxSide(v.Theme, "", width))
687				if tr.IsError {
688					lines = append(lines, toolBoxSide(v.Theme, v.Theme.FG256(color, "  error"), width))
689				}
690				for _, line := range v.renderToolResultContent(tr.Content, width, color, path, startLine) {
691					// Image-footprint rows (the escape row, the blank
692					// reservation rows beneath it, and the gap row
693					// before the metadata caption) are tagged with the
694					// imageFootprintSentinel by renderImageBlock. Strip
695					// the tag, parse the optional width hint, then wrap
696					// the row in the usual │ ... │ box edges so the
697					// frame stays continuous around the image.
698					imgCells, stripped := parseImageFootprint(line)
699					if hasImageEscapeLine(stripped) {
700						lines = append(lines, toolBoxSideWithImage(v.Theme, stripped, imgCells, width))
701					} else {
702						lines = append(lines, toolBoxSide(v.Theme, stripped, width))
703					}
704				}
705				lines = append(lines, toolBoxSide(v.Theme, "", width))
706				lines = append(lines, toolBoxBottom(v.Theme, width))
707			}
708		}
709	}
710	return lines
711}
712
713func (v *View) renderToolCall(tc ToolCallView, width int) []string {
714	var lines []string
715
716	// Header label. While the call is still streaming, prefer the
717	// live path extracted from the partial args so the user sees
718	// the target file as soon as it's known, even before the full
719	// JSON arrived.
720	arg := tc.Args
721	if arg == "" && tc.LivePath != "" {
722		arg = tc.LivePath
723	}
724	label := tc.Name + " " + arg
725
726	// No leading blank: Build()'s inter-message separator already
727	// places one blank row between the previous transcript content
728	// and the live overlay, matching the spacing the same call has
729	// once it finalises into a transcript box. Adding another blank
730	// here would double the gap during streaming and visibly tighten
731	// when the overlay disappears.
732
733	// Live body (write/edit): keep the streamed preview visible until
734	// a real tool result arrives. The provider can finish the tool_use
735	// JSON before zot has executed the tool, so keying this on
736	// tc.Streaming makes write/edit boxes collapse for a moment between
737	// EvToolUseEnd and EvToolResult.
738	if tc.Result == "" {
739		if body := v.renderLiveToolBody(tc, width); len(body) > 0 {
740			lines = append(lines, toolBoxTop(v.Theme, label, width))
741			lines = append(lines, toolBoxSide(v.Theme, "", width))
742			lines = append(lines, body...)
743			lines = append(lines, toolBoxSide(v.Theme, "", width))
744			lines = append(lines, toolBoxBottom(v.Theme, width))
745			return lines
746		}
747	}
748
749	// Finished tool call with no body: just the labelled top edge
750	// directly closed by the bottom. Avoids a blank interior row
751	// for no-output tools.
752	if tc.Result == "" {
753		lines = append(lines, toolBoxTop(v.Theme, label, width))
754		lines = append(lines, toolBoxBottom(v.Theme, width))
755		return lines
756	}
757
758	// Finished tool call with a result body. Top edge embeds the
759	// label; body lines go through toolBoxSide so each row gets
760	// vertical edges; bottom edge closes the box. Blank interior
761	// rows after the top and before the bottom give the body a bit
762	// of breathing room from the corners.
763	lines = append(lines, toolBoxTop(v.Theme, label, width))
764	lines = append(lines, toolBoxSide(v.Theme, "", width))
765	color := v.Theme.ToolOut
766	if tc.Error {
767		color = v.Theme.Error
768	}
769	body := toolResultBlock(v.Theme, tc.Result, toolBoxBodyRenderWidth(width), color)
770	for _, l := range v.collapseToolBody(body, false) {
771		imgCells, stripped := parseImageFootprint(l)
772		if hasImageEscapeLine(stripped) {
773			lines = append(lines, toolBoxSideWithImage(v.Theme, stripped, imgCells, width))
774			continue
775		}
776		lines = append(lines, toolBoxSide(v.Theme, stripped, width))
777	}
778	lines = append(lines, toolBoxSide(v.Theme, "", width))
779	lines = append(lines, toolBoxBottom(v.Theme, width))
780	return lines
781}
782
783// renderLiveToolBody renders the in-flight preview of a streaming
784// tool call. Supported tools:
785//
786//   - write: shows the partial `content` field, syntax-highlighted
787//     by the target path's language.
788//   - edit:  shows the partial `newText` of the edit currently being
789//     streamed, prefixed with a "editing foo.ts (edit 2)" header so
790//     the user can see which of a multi-edit batch is in progress.
791//
792// Anything else returns nil and only the tool-call header shows.
793func (v *View) renderLiveToolBody(tc ToolCallView, width int) []string {
794	switch tc.Name {
795	case "write", "Write":
796		partial, ok, _ := ExtractPartialStringField(tc.RawJSONBuf, "content")
797		if !ok || partial == "" {
798			return nil
799		}
800		return v.wrapLiveBody(v.renderRawFile(partial, tc.LivePath, 1), width)
801	case "edit", "Edit":
802		partial, ok, _, idx := ExtractLastNewText(tc.RawJSONBuf)
803		if !ok || partial == "" {
804			return nil
805		}
806		// Header line hints which edit is streaming and, when more
807		// than one has landed, how many the model is doing.
808		hint := fmt.Sprintf("edit %d (streaming)", idx)
809		body := []string{"    " + v.Theme.FG256(v.Theme.Muted, hint), ""}
810		body = append(body, v.renderRawFile(partial, tc.LivePath, 1)...)
811		return v.wrapLiveBody(body, width)
812	}
813	return nil
814}
815
816// wrapLiveBody returns the streaming body content as a list of
817// box-side rows: each line wrapped in │ ... │ with right padding so
818// the closing edge sits at column width-1. The caller (renderToolCall)
819// supplies the surrounding top/bottom edges so the live overlay
820// renders as a closed box matching the finalised transcript form.
821func (v *View) wrapLiveBody(body []string, width int) []string {
822	body = v.collapseToolBody(body, false)
823	out := make([]string, 0, len(body))
824	for _, l := range body {
825		imgCells, stripped := parseImageFootprint(l)
826		if hasImageEscapeLine(stripped) {
827			out = append(out, toolBoxSideWithImage(v.Theme, stripped, imgCells, width))
828			continue
829		}
830		out = append(out, toolBoxSide(v.Theme, stripped, width))
831	}
832	return out
833}
834
835// toolResultBlock wraps text in thin horizontal rules (top + bottom),
836// indenting the body with four spaces. The rules span the content column.
837// toolBlockRule renders the muted horizontal separator drawn
838// above and below a tool call block. Spans the full content
839// width so it reads as a real section break in the chat
840// regardless of terminal size.
841func toolBlockRule(th Theme, width int) string {
842	w := width
843	if w < 8 {
844		w = 8
845	}
846	return th.FG256(th.Muted, strings.Repeat("─", w))
847}
848
849// toolBoxInnerPad is the number of blank cells kept between a box
850// edge (┌, │, └) and the content inside it. One cell of breathing
851// room makes the label read as part of the box rather than fused to
852// the corner, and gives body lines a tiny gutter from the left side.
853const toolBoxInnerPad = 1
854
855// toolBoxOuterMargin is the number of blank cells kept to the left of
856// the opening corner and to the right of the closing corner. Aligns
857// the box's frame with the column where user-bubble text begins, so
858// the conversation reads as one column instead of having tool boxes
859// running edge-to-edge while user/assistant rows sit indented.
860const toolBoxOuterMargin = 2
861
862// toolBoxTop renders the labelled top edge of a tool block:
863//
864//	┌─  bash xcrun simctl list devices ─────────────────────────────┐
865//
866// The label is the tool name + short args (the same string previously
867// shown on its own row beneath the rule). Padding fills the remainder
868// of the line so the right corner sits at column width-1, matching the
869// closing edge.
870func toolBoxTop(th Theme, label string, width int) string {
871	label = oneLineToolLabel(label)
872	w := width - 2*toolBoxOuterMargin
873	if w < 12 {
874		w = 12
875	}
876	margin := strings.Repeat(" ", toolBoxOuterMargin)
877	innerPad := strings.Repeat(" ", toolBoxInnerPad)
878	// "┌─" + innerPad + " " + label + " " + innerPad = used; pad
879	// with ─ to width-1, then "┐".
880	prefix := "┌─" + innerPad + " "
881	suffix := " " + innerPad
882	used := visibleWidth(prefix) + visibleWidth(label) + visibleWidth(suffix)
883	fill := w - used - 1 // -1 for the closing corner
884	if fill < 0 {
885		// Label overflows; truncate with an ellipsis so the right
886		// corner still lands on the right edge. Rare on real
887		// terminals (the chat column is usually wide enough).
888		over := -fill
889		runes := []rune(label)
890		if over+3 < len(runes) {
891			label = string(runes[:len(runes)-over-3]) + "..."
892		} else {
893			label = "..."
894		}
895		used = visibleWidth(prefix) + visibleWidth(label) + visibleWidth(suffix)
896		fill = w - used - 1
897		if fill < 0 {
898			fill = 0
899		}
900	}
901	fillStr := strings.Repeat("─", fill)
902	name, rest := splitToolLabel(label)
903	return margin + th.FG256(th.Muted, prefix) + th.FG256(th.FG, name) + th.FG256(th.Muted, rest+suffix+fillStr+"┐") + margin
904}
905
906func oneLineToolLabel(label string) string {
907	return strings.Join(strings.Fields(label), " ")
908}
909
910func splitToolLabel(label string) (name, rest string) {
911	label = strings.TrimLeft(label, " ")
912	if label == "" {
913		return "", ""
914	}
915	idx := strings.IndexAny(label, " \t")
916	if idx < 0 {
917		return label, ""
918	}
919	return label[:idx], label[idx:]
920}
921
922// toolBoxBottom renders the bottom edge of a tool block:
923//
924//	└─────────────────────────────────────────────────────────────────────────────┘
925//
926// Spans the same width as toolBoxTop so the corners line up.
927func toolBoxBottom(th Theme, width int) string {
928	w := width - 2*toolBoxOuterMargin
929	if w < 12 {
930		w = 12
931	}
932	margin := strings.Repeat(" ", toolBoxOuterMargin)
933	line := "└" + strings.Repeat("─", w-2) + "┘"
934	return margin + th.FG256(th.Muted, line) + margin
935}
936
937// hasImageEscapeLine reports whether s contains a Kitty (\x1b_G) or
938// iTerm2 (\x1b]1337;File=) inline-image escape. Such rows draw into
939// the terminal's graphics layer and shouldn't be wrapped with text
940// box edges.
941func hasImageEscapeLine(s string) bool {
942	return strings.Contains(s, "\x1b]1337;File=") || strings.Contains(s, "\x1b_G")
943}
944
945// imageFootprintSentinel marks rows that belong to an inline-image's
946// reserved footprint — the escape row plus the blank rows below it
947// plus the gap row before the metadata caption. Any consumer that
948// wraps content in box edges (│ ... │) detects the sentinel, strips
949// it, and emits the row — the image graphics rectangle paints over
950// whatever was drawn there. Uses a non-printing C0 control byte so
951// it can never appear in normal text or in an ANSI escape sequence
952// body.
953//
954// The escape row carries an extra width hint between two sentinels:
955// "\x1e<cells>\x1e<spaces+escape>". Wrappers parse the cells count
956// to know how wide the image is in terminal cells and how many cells
957// of trailing padding are needed before the closing box edge.
958const imageFootprintSentinel = "\x1e"
959
960// parseImageFootprint splits a footprint-tagged row into (cellsWide,
961// rest). cellsWide is 0 when the row carries no width hint (the
962// reservation blanks and gap row don't, only the escape row does).
963func parseImageFootprint(s string) (int, string) {
964	if !strings.HasPrefix(s, imageFootprintSentinel) {
965		return 0, s
966	}
967	rest := s[len(imageFootprintSentinel):]
968	end := strings.Index(rest, imageFootprintSentinel)
969	if end < 0 {
970		return 0, rest
971	}
972	w, err := strconv.Atoi(rest[:end])
973	if err != nil {
974		return 0, rest
975	}
976	return w, rest[end+len(imageFootprintSentinel):]
977}
978
979// toolBoxBodyTrimLeft is the number of leading literal spaces stripped
980// from each body line as it enters toolBoxSide. Body renderers
981// (renderToolText, renderRawFile, the diff/bash helpers, ...) all
982// emit a 4-cell indent so the content aligns with the assistant body
983// column when there's no box around it. Inside a box the box edge +
984// inner pad already supply most of that gutter, so we drop a couple
985// of cells from the body's own indent to keep the content from
986// drifting too far right.
987const toolBoxBodyTrimLeft = 2
988
989// toolBoxBodyRenderWidth is the width body renderers should target before
990// their rows are wrapped by toolBoxSide. Most body renderers emit a four-cell
991// indent; toolBoxSide trims toolBoxBodyTrimLeft cells from that indent and
992// then adds the box edge/padding. Passing the full terminal width lets long
993// bash/heredoc lines overrun the inner box and makes terminals soft-wrap,
994// visually breaking the right edge. This returns the maximum renderer width
995// whose post-trim visible width fits inside the box.
996func toolBoxBodyRenderWidth(width int) int {
997	w := width - 2*toolBoxOuterMargin
998	if w < 12 {
999		w = 12
1000	}
1001	inner := w - 2 - 2*toolBoxInnerPad
1002	if inner < 1 {
1003		inner = 1
1004	}
1005	return inner + toolBoxBodyTrimLeft
1006}
1007
1008// toolBoxSide wraps a single body line with vertical box edges:
1009//
1010//	│  foo bar baz                                            │
1011//
1012// The middle preserves the line verbatim (including any ANSI escapes)
1013// after stripping toolBoxBodyTrimLeft leading literal spaces. One cell
1014// of inner padding sits on each side so the content breathes from the
1015// edges; the right padding fills to column width-1.
1016func toolBoxSide(th Theme, line string, width int) string {
1017	w := width - 2*toolBoxOuterMargin
1018	if w < 12 {
1019		w = 12
1020	}
1021	margin := strings.Repeat(" ", toolBoxOuterMargin)
1022	left := th.FG256(th.Muted, "│") + strings.Repeat(" ", toolBoxInnerPad)
1023	right := strings.Repeat(" ", toolBoxInnerPad) + th.FG256(th.Muted, "│")
1024	inner := w - 2 - 2*toolBoxInnerPad // available between the two pads
1025	line = trimLeadingSpaces(line, toolBoxBodyTrimLeft)
1026
1027	cur := visibleWidth(line)
1028	if cur > inner {
1029		// Last-resort truncation. Strips ANSI styling at the cut
1030		// point; rare path so the simpler implementation is fine.
1031		line = stripANSI(line)
1032		runes := []rune(line)
1033		if len(runes) > inner {
1034			line = string(runes[:inner])
1035		}
1036		cur = visibleWidth(line)
1037	}
1038	pad := inner - cur
1039	if pad < 0 {
1040		pad = 0
1041	}
1042	return margin + left + line + strings.Repeat(" ", pad) + right + margin
1043}
1044
1045// toolBoxSideWithImage wraps a row that carries an inline-image
1046// escape sequence. The image protocols are configured to not move
1047// the cursor after rendering (iTerm: doNotMoveCursor=1, kitty/
1048// ghostty: C=1), so the only visible cell advance on the row is
1049// from the leading indent spaces before the escape. We pad from
1050// there to the right edge column and draw the closing │ there.
1051// imgCells is unused (kept in the signature for compatibility with
1052// the parseImageFootprint width hint).
1053func toolBoxSideWithImage(th Theme, line string, imgCells, width int) string {
1054	_ = imgCells
1055	w := width - 2*toolBoxOuterMargin
1056	if w < 12 {
1057		w = 12
1058	}
1059	margin := strings.Repeat(" ", toolBoxOuterMargin)
1060	left := th.FG256(th.Muted, "│") + strings.Repeat(" ", toolBoxInnerPad)
1061	right := strings.Repeat(" ", toolBoxInnerPad) + th.FG256(th.Muted, "│")
1062	inner := w - 2 - 2*toolBoxInnerPad
1063
1064	line = trimLeadingSpaces(line, toolBoxBodyTrimLeft)
1065
1066	// Count leading spaces (visible cells consumed before the escape).
1067	leading := 0
1068	for leading < len(line) && line[leading] == ' ' {
1069		leading++
1070	}
1071
1072	pad := inner - leading
1073	if pad < 0 {
1074		pad = 0
1075	}
1076	return margin + left + line + strings.Repeat(" ", pad) + right + margin
1077}
1078
1079// trimLeadingSpaces removes up to n literal space characters from the
1080// start of s without touching anything else. ANSI CSI escapes that
1081// appear before the spaces are skipped over (so a coloured indent
1082// like "\x1b[2m    text" still loses its first n cells of indent).
1083// Stops as soon as it hits a non-space character.
1084func trimLeadingSpaces(s string, n int) string {
1085	if n <= 0 || s == "" {
1086		return s
1087	}
1088	var b strings.Builder
1089	b.Grow(len(s))
1090	trimmed := 0
1091	i := 0
1092	for i < len(s) {
1093		// Pass through any ANSI escape sequence verbatim.
1094		if s[i] == 0x1b && i+1 < len(s) && s[i+1] == '[' {
1095			end := i + 2
1096			for end < len(s) {
1097				c := s[end]
1098				end++
1099				if c >= 0x40 && c <= 0x7e {
1100					break
1101				}
1102			}
1103			b.WriteString(s[i:end])
1104			i = end
1105			continue
1106		}
1107		if trimmed < n && s[i] == ' ' {
1108			trimmed++
1109			i++
1110			continue
1111		}
1112		b.WriteString(s[i:])
1113		return b.String()
1114	}
1115	return b.String()
1116}
1117
1118// renderToolResultContent renders the body of a tool result block.
1119// Text blocks get the usual rules-wrapped treatment; text that looks
1120// like a unified diff gets +/- coloring. Image blocks are rendered
1121// inline when the terminal supports a protocol, else as a text
1122// placeholder with dimensions.
1123func (v *View) renderToolResultContent(blocks []provider.Content, width, color int, sourcePath string, startLine int) []string {
1124	var body []string
1125	hasImage := false
1126	for _, b := range blocks {
1127		switch bb := b.(type) {
1128		case provider.TextBlock:
1129			bodyWidth := toolBoxBodyRenderWidth(width)
1130			body = append(body, v.renderToolText(bb.Text, bodyWidth, color, sourcePath, startLine)...)
1131		case provider.ImageBlock:
1132			hasImage = true
1133			body = append(body, v.renderImageBlock(bb, width)...)
1134		}
1135	}
1136	return v.collapseToolBody(body, hasImage)
1137}
1138
1139// collapseToolBody trims lines to the configured preview size when the
1140// view is not in ExpandAll mode, appending a muted "... ctrl+o to
1141// expand" footer. Image blocks never collapse — they're short in text
1142// rows but represent real content the user wants to see.
1143func (v *View) collapseToolBody(lines []string, hasImage bool) []string {
1144	if v.ExpandAll || hasImage {
1145		return lines
1146	}
1147	if len(lines) <= ToolCollapseLines {
1148		return lines
1149	}
1150	kept := lines[:ToolCollapsePreview]
1151	hidden := len(lines) - ToolCollapsePreview
1152	total := len(lines)
1153	footer := fmt.Sprintf("    ... (%d more lines, %d total, ctrl+o to expand)", hidden, total)
1154	footer = v.Theme.FG256(v.Theme.Muted, footer)
1155	out := append([]string(nil), kept...)
1156	out = append(out, "")
1157	return append(out, footer)
1158}
1159
1160// renderToolText renders a text block inside a tool result. If the
1161// text contains a unified-diff section (lines starting with "--- " /
1162// "+++ " / "+" / "-"/" "), those rows are styled with add/remove
1163// colors matching git diff conventions.
1164func (v *View) renderToolText(text string, width, defaultColor int, sourcePath string, startLine int) []string {
1165	// Legacy path: transcripts saved before we dropped line numbers
1166	// from the read tool still carry "     1\t..." prefixes. Detect and
1167	// strip them, then fall through to the highlighter.
1168	if looksLikeNumberedFile(text) {
1169		return v.renderNumberedFile(text, sourcePath)
1170	}
1171	// If the result embeds a unified diff (the edit tool's output
1172	// starts with a short "applied N edit(s)" line and then a
1173	// standard --- / +++ / +/- patch), render the patch with
1174	// add/remove coloring. This takes priority over the file-like
1175	// detector below because a diff technically has many lines of
1176	// "file content" but what the user cares about is what changed,
1177	// not a dump of the post-edit file.
1178	if looksLikeUnifiedDiff(text) {
1179		return v.renderUnifiedDiff(text, width, sourcePath)
1180	}
1181
1182	// Current path: text came from `read` as raw file bytes. When a
1183	// source path is known (the call had a `path` arg), render with
1184	// a synthetic line-number gutter starting at startLine so the
1185	// on-screen view still looks like cat -n. Doesn't apply to non-
1186	// file tool outputs (bash stdout, display notes, etc.).
1187	if sourcePath != "" && looksLikeFileContent(text) {
1188		return v.renderRawFile(text, sourcePath, startLine)
1189	}
1190
1191	// No truncation — the full tool output is rendered into chat and
1192	// becomes part of the scrollback you can page back through.
1193	lines := strings.Split(text, "\n")
1194
1195	// Bash-result styling: when the first row looks like a shell
1196	// prompt line ("$ ...") emitted by the bash tool, style the
1197	// prompt line in accent and the trailing "[exit N]  Took X.Ys"
1198	// line in muted type so the command + timing read at a glance.
1199	// Everything between is left on the default tool-output color.
1200	if len(lines) > 0 && strings.HasPrefix(lines[0], "$ ") {
1201		return v.renderBashResult(lines, width, defaultColor)
1202	}
1203
1204	inDiff := false
1205	oldLine, newLine := 1, 1
1206	var out []string
1207	for _, l := range lines {
1208		// Detect diff header: "--- name" followed somewhere by "+++ name".
1209		if strings.HasPrefix(l, "--- ") || strings.HasPrefix(l, "+++ ") {
1210			inDiff = true
1211			out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, l))
1212			continue
1213		}
1214		// Hunk header "@@ -a,b +c,d @@" resets the counters so patches
1215		// that skip around in the file still get correct numbering.
1216		if inDiff && strings.HasPrefix(l, "@@") {
1217			if o, n, ok := parseHunkHeader(l); ok {
1218				oldLine, newLine = o, n
1219			}
1220			out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, l))
1221			continue
1222		}
1223		if inDiff && strings.TrimSpace(l) == "..." {
1224			out = append(out, "")
1225			out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, "..."))
1226			continue
1227		}
1228		if inDiff && len(l) > 0 {
1229			switch l[0] {
1230			case '+':
1231				out = append(out, v.renderDiffRow(l, width, v.Theme.Tool, newLine, '+', sourcePath))
1232				newLine++
1233				continue
1234			case '-':
1235				out = append(out, v.renderDiffRow(l, width, v.Theme.Error, oldLine, '-', sourcePath))
1236				oldLine++
1237				continue
1238			case ' ':
1239				out = append(out, v.renderDiffRow(l, width, v.Theme.Muted, newLine, ' ', sourcePath))
1240				oldLine++
1241				newLine++
1242				continue
1243			}
1244		}
1245		// Regular line.
1246		for _, w := range wrapLine(l, width-4, "    ") {
1247			out = append(out, "    "+v.Theme.FG256(defaultColor, w))
1248		}
1249	}
1250	return out
1251}
1252
1253// parseHunkHeader extracts the starting old/new line from a unified
1254// diff hunk header ("@@ -12,5 +12,7 @@ ..."). Returns ok=false if the
1255// header is malformed or missing numbers.
1256func parseHunkHeader(l string) (oldStart, newStart int, ok bool) {
1257	// Skip "@@ "
1258	rest := strings.TrimPrefix(l, "@@")
1259	rest = strings.TrimSpace(rest)
1260	if !strings.HasPrefix(rest, "-") {
1261		return 0, 0, false
1262	}
1263	rest = rest[1:]
1264	space := strings.IndexByte(rest, ' ')
1265	if space < 0 {
1266		return 0, 0, false
1267	}
1268	oldPart := rest[:space]
1269	rest = strings.TrimSpace(rest[space+1:])
1270	if !strings.HasPrefix(rest, "+") {
1271		return 0, 0, false
1272	}
1273	rest = rest[1:]
1274	if sp := strings.IndexAny(rest, " \t"); sp >= 0 {
1275		rest = rest[:sp]
1276	}
1277	parseStart := func(s string) (int, bool) {
1278		if c := strings.IndexByte(s, ','); c >= 0 {
1279			s = s[:c]
1280		}
1281		n, err := strconv.Atoi(s)
1282		if err != nil || n < 1 {
1283			return 0, false
1284		}
1285		return n, true
1286	}
1287	o, ok1 := parseStart(oldPart)
1288	n, ok2 := parseStart(rest)
1289	if !ok1 || !ok2 {
1290		return 0, 0, false
1291	}
1292	return o, n, true
1293}
1294
1295// renderDiffRow renders one unified-diff line with a read-style gutter
1296// (6-cell right-aligned line number, muted) followed by the +/-/space
1297// marker and the code. Code is syntax-highlighted if sourcePath hints
1298// at a known language; falls back to the plain diff color otherwise.
1299func (v *View) renderDiffRow(line string, width, color int, lineNo int, mark byte, sourcePath string) string {
1300	if len(line) == 0 {
1301		return ""
1302	}
1303	code := expandTabs(line[1:]) // strip the leading marker; expand tabs
1304
1305	// Syntax-highlight the code half when we know the language. Use
1306	// the same HighlightCode pipeline as renderNumberedFile so the
1307	// palette matches.
1308	lang := LanguageFromPath(sourcePath)
1309	var codeRendered string
1310	if lang != "" {
1311		if h := v.Theme.HighlightCode(code, lang); len(h) == 1 {
1312			codeRendered = h[0]
1313		}
1314	}
1315	if codeRendered == "" {
1316		if mark == ' ' {
1317			codeRendered = v.Theme.FG256(v.Theme.Muted, code)
1318		} else {
1319			codeRendered = v.Theme.FG256(color, code)
1320		}
1321	}
1322
1323	// Gutter shape: sign + number share a color so they read as one
1324	// visual token ("+123") instead of a neutral line number next to
1325	// a stray marker. Unchanged context lines get a muted gutter and
1326	// a leading space so column alignment stays consistent with +/-
1327	// rows.
1328	var gutterText string
1329	switch mark {
1330	case '+':
1331		gutterText = fmt.Sprintf("+%3d ", lineNo)
1332	case '-':
1333		gutterText = fmt.Sprintf("-%3d ", lineNo)
1334	default:
1335		gutterText = fmt.Sprintf(" %3d ", lineNo)
1336	}
1337	var gutter string
1338	if mark == ' ' {
1339		gutter = v.Theme.FG256(v.Theme.Muted, gutterText)
1340	} else {
1341		gutter = v.Theme.FG256(color, gutterText)
1342	}
1343	row := "    " + gutter + codeRendered
1344
1345	// Cheap width clamp: truncate visible text if the raw code is too
1346	// long. We work on the pre-ANSI code string because measuring ansi
1347	// output is unreliable.
1348	maxCode := width - 4 /* indent */ - 7 /* gutter (sign+5 digits+tab) */
1349	if maxCode > 0 && len(code) > maxCode {
1350		trunc := strings.Repeat(".", maxCode)
1351		if maxCode > 3 {
1352			trunc = code[:maxCode-3] + "..."
1353		}
1354		if lang != "" {
1355			if h := v.Theme.HighlightCode(trunc, lang); len(h) == 1 {
1356				codeRendered = h[0]
1357			} else if mark == ' ' {
1358				codeRendered = v.Theme.FG256(v.Theme.Muted, trunc)
1359			} else {
1360				codeRendered = v.Theme.FG256(color, trunc)
1361			}
1362		} else if mark == ' ' {
1363			codeRendered = v.Theme.FG256(v.Theme.Muted, trunc)
1364		} else {
1365			codeRendered = v.Theme.FG256(color, trunc)
1366		}
1367		row = "    " + gutter + codeRendered
1368	}
1369	return row
1370}
1371
1372// renderImageBlock returns the lines for one image, inline if possible.
1373//
1374// Inline image escapes paint into multiple terminal rows but the zot
1375// renderer treats each slice entry as a single row. To prevent chat
1376// content from being drawn on top of the image, we pad with blank rows
1377// so the image's real footprint is reflected in the frame height.
1378func (v *View) renderImageBlock(b provider.ImageBlock, width int) []string {
1379	w, h := ImageDimensions(b.Data)
1380	kb := len(b.Data) / 1024
1381	// Four-space indent matches every other tool-output row
1382	// (renderRawFile, renderBashResult, diff rows, "... N more
1383	// lines" footers). Keeps the image's metadata line vertically
1384	// aligned with the file content above / below it.
1385	info := fmt.Sprintf("    image - %s - %dx%d - %d KB", b.MimeType, w, h, kb)
1386
1387	if v.ImageProto != ImageProtocolNone {
1388		// Clamp rendered width so the image never overflows the chat
1389		// column. Subtract a 4-cell indent for the tool result block,
1390		// cap at 60 cells, floor at 10.
1391		cells := width - 4
1392		if cells > 60 {
1393			cells = 60
1394		}
1395		if cells < 10 {
1396			cells = 10
1397		}
1398		const maxRows = 20
1399		if seq := RenderInlineImageScaled(v.ImageProto, b.Data, b.MimeType, cells, maxRows); seq != "" {
1400			rows, actualCells := InlineImageFootprint(b.Data, cells, maxRows)
1401			if rows < 1 {
1402				rows = 1
1403			}
1404			if actualCells < 1 {
1405				actualCells = cells
1406			}
1407			// Reserve the image footprint first, then place the escape
1408			// in the top-left of that blank rectangle. Keeping the
1409			// metadata above the image made some terminals blend text
1410			// and graphics layers during full-screen repaints; metadata
1411			// below the reserved rectangle is more stable and easier to
1412			// read. One extra blank row before the metadata gives the
1413			// caption breathing room from the image's last pixel row.
1414			//
1415			// Every footprint row (escape, reservations, gap) is tagged
1416			// with imageFootprintSentinel so callers wrapping content in
1417			// box edges can recognise these rows and emit them bare —
1418			// the image's graphics rectangle paints over them and any
1419			// │ character drawn alongside would visibly bleed through.
1420			// 4 leading cells push the escape past the box's left
1421			// edge plus a small interior gutter so the image rectangle
1422			// sits visibly inside the frame instead of kissing the │.
1423			// The escape row carries a width hint after the sentinel
1424			// ("\x1e<cells>\x1e...") so toolBoxSide knows how many
1425			// cells the image occupies and can pad to the right edge.
1426			widthHint := fmt.Sprintf("%s%d%s", imageFootprintSentinel, actualCells, imageFootprintSentinel)
1427			out := make([]string, 0, rows+3)
1428			out = append(out, widthHint+"    "+seq)
1429			for i := 1; i < rows; i++ {
1430				out = append(out, imageFootprintSentinel)
1431			}
1432			out = append(out, imageFootprintSentinel)
1433			out = append(out, v.Theme.FG256(v.Theme.Muted, info))
1434			return out
1435		}
1436	}
1437	return []string{v.Theme.FG256(v.Theme.Muted, info)}
1438}
1439
1440// looksLikeNumberedFile returns true when text matches the `read`
1441// tool's "     N\tcontent" format for most of its lines.
1442func looksLikeNumberedFile(text string) bool {
1443	lines := strings.Split(text, "\n")
1444	if len(lines) == 0 {
1445		return false
1446	}
1447	hits := 0
1448	scanned := 0
1449	for _, l := range lines {
1450		if l == "" {
1451			continue
1452		}
1453		scanned++
1454		if scanned > 20 {
1455			break
1456		}
1457		if numberedLineRE.MatchString(l) {
1458			hits++
1459		}
1460	}
1461	if scanned == 0 {
1462		return false
1463	}
1464	return hits*2 >= scanned // majority of non-empty lines match
1465}
1466
1467var numberedLineRE = regexp.MustCompile(`^\s*\d+\t`)
1468
1469// renderNumberedFile strips line numbers, highlights the code, and
1470// re-attaches the line numbers in muted color.
1471func (v *View) renderNumberedFile(text, sourcePath string) []string {
1472	lines := strings.Split(text, "\n")
1473	gutters := make([]string, 0, len(lines))
1474	codes := make([]string, 0, len(lines))
1475	for _, l := range lines {
1476		idx := strings.IndexByte(l, '\t')
1477		if idx < 0 || !numberedLineRE.MatchString(l) {
1478			// Non-code footer (e.g. "[truncated at 2000 lines]").
1479			gutters = append(gutters, "")
1480			codes = append(codes, l)
1481			continue
1482		}
1483		gutter := l[:idx] + " " // replace tab with single space
1484		code := expandTabs(l[idx+1:])
1485		gutters = append(gutters, gutter)
1486		codes = append(codes, code)
1487	}
1488	lang := LanguageFromPath(sourcePath)
1489	var highlighted []string
1490	if lang != "" {
1491		highlighted = v.Theme.HighlightCode(strings.Join(codes, "\n"), lang)
1492		// Chroma sometimes collapses the trailing empty line. Pad to
1493		// align with the gutter slice so per-line zipping works.
1494		for len(highlighted) < len(codes) {
1495			highlighted = append(highlighted, "")
1496		}
1497		if len(highlighted) > len(codes) {
1498			highlighted = highlighted[:len(codes)]
1499		}
1500	} else {
1501		// No lexer for this file type — render in the ToolOut color so
1502		// code is visually distinct from the muted gutter.
1503		highlighted = make([]string, len(codes))
1504		for i, c := range codes {
1505			highlighted[i] = v.Theme.FG256(v.Theme.ToolOut, c)
1506		}
1507	}
1508	out := make([]string, 0, len(codes))
1509	for i, code := range highlighted {
1510		g := gutters[i]
1511		if g == "" {
1512			out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, code))
1513			continue
1514		}
1515		out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, g)+code)
1516	}
1517	return out
1518}
1519
1520// looksLikeFileContent is a cheap guard to distinguish a read-tool
1521// result from bash stdout or a status message. File content usually
1522// contains characters that status messages don't (code punctuation,
1523// longer lines, multiple lines) and rarely starts with the "  >"-
1524// or "error:"-style prefixes tools emit. False positives are OK,
1525// the worst case is a line-number gutter on something that isn't
1526// really code.
1527// renderBashResult styles a bash tool result: the "$ command" first
1528// line in the accent color, the trailing "[exit N]  Took X.Ys" line
1529// in muted type, everything else on the default tool-output color.
1530// Called from renderToolText when the first line starts with "$ ".
1531func (v *View) renderBashResult(lines []string, width, defaultColor int) []string {
1532	lines = normalizeBashOutputLines(lines)
1533	// Identify the footer line (exit + timing). The bash tool writes
1534	// it as the last non-empty line of the result.
1535	footerIdx := -1
1536	for i := len(lines) - 1; i >= 0; i-- {
1537		trimmed := strings.TrimSpace(lines[i])
1538		if trimmed == "" {
1539			continue
1540		}
1541		if strings.HasPrefix(trimmed, "[exit ") {
1542			footerIdx = i
1543		}
1544		break
1545	}
1546
1547	var out []string
1548	for i, l := range lines {
1549		switch {
1550		case i == 0 && strings.HasPrefix(l, "$ "):
1551			// Style the $ and the command text in accent. No
1552			// further processing / wrapping so the shell-style
1553			// prompt reads at a glance.
1554			for _, w := range wrapLine(l, width-4, "    ") {
1555				out = append(out, "    "+v.Theme.FG256(v.Theme.Accent, w))
1556			}
1557		case i == footerIdx:
1558			for _, w := range wrapLine(l, width-4, "    ") {
1559				out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, w))
1560			}
1561		default:
1562			for _, w := range wrapLine(l, width-4, "    ") {
1563				out = append(out, "    "+v.Theme.FG256(defaultColor, w))
1564			}
1565		}
1566	}
1567	return out
1568}
1569
1570// normalizeBashOutputLines turns arbitrary terminal output into plain,
1571// box-safe rows before wrapping. Unlike read/write/edit output, bash
1572// stdout/stderr may contain tabs, carriage returns, ANSI/OSC escapes,
1573// and other C0 controls from subprocesses. If those reach the bordered
1574// tool box, the width calculator can undercount what the terminal will
1575// draw and the right edge appears broken. Keep printable text, expand
1576// tabs to spaces, split carriage-return progress rows, and drop escape
1577// / control sequences.
1578func normalizeBashOutputLines(lines []string) []string {
1579	var out []string
1580	for _, line := range lines {
1581		for _, part := range strings.Split(strings.ReplaceAll(line, "\r", "\n"), "\n") {
1582			out = append(out, normalizeBashOutputLine(part))
1583		}
1584	}
1585	if len(out) == 0 {
1586		return []string{""}
1587	}
1588	return out
1589}
1590
1591func normalizeBashOutputLine(s string) string {
1592	var b strings.Builder
1593	col := 0
1594	for i := 0; i < len(s); {
1595		c := s[i]
1596		if c == 0x1b { // ESC: strip CSI/OSC/DCS and simple escapes.
1597			i = skipEscapeSequence(s, i)
1598			continue
1599		}
1600		r, size := utf8.DecodeRuneInString(s[i:])
1601		if r == utf8.RuneError && size == 1 {
1602			i++
1603			continue
1604		}
1605		switch r {
1606		case '\t':
1607			spaces := 8 - (col % 8)
1608			if spaces == 0 {
1609				spaces = 8
1610			}
1611			b.WriteString(strings.Repeat(" ", spaces))
1612			col += spaces
1613		case '\b':
1614			// Backspace-overstrike output is common in spinners/progress bars.
1615			// Dropping it is safer than moving the TUI cursor backwards.
1616		case '\n', '\r':
1617			// Already split by normalizeBashOutputLines.
1618		default:
1619			if r < 0x20 || r == 0x7f {
1620				// Drop non-printing controls.
1621				break
1622			}
1623			b.WriteRune(r)
1624			col += runewidth.RuneWidth(r)
1625		}
1626		i += size
1627	}
1628	return b.String()
1629}
1630
1631func skipEscapeSequence(s string, i int) int {
1632	if i >= len(s) || s[i] != 0x1b {
1633		return i + 1
1634	}
1635	if i+1 >= len(s) {
1636		return len(s)
1637	}
1638	switch s[i+1] {
1639	case '[': // CSI: ESC [ ... final byte 0x40-0x7e
1640		j := i + 2
1641		for j < len(s) {
1642			c := s[j]
1643			j++
1644			if c >= 0x40 && c <= 0x7e {
1645				break
1646			}
1647		}
1648		return j
1649	case ']': // OSC: ESC ] ... BEL or ST
1650		return skipStringEscape(s, i+2)
1651	case 'P', '_', '^', 'X': // DCS/APC/PM/SOS: ESC P ... ST, etc.
1652		return skipStringEscape(s, i+2)
1653	default:
1654		// Two-byte escape (cursor save/restore, charset select, etc.).
1655		return i + 2
1656	}
1657}
1658
1659func skipStringEscape(s string, i int) int {
1660	for i < len(s) {
1661		if s[i] == 0x07 { // BEL
1662			return i + 1
1663		}
1664		if s[i] == 0x1b && i+1 < len(s) && s[i+1] == '\\' { // ST
1665			return i + 2
1666		}
1667		i++
1668	}
1669	return len(s)
1670}
1671
1672// looksLikeUnifiedDiff reports whether text is a context diff as
1673// emitted by the edit tool: rows start with '+', '-', ' ', or
1674// literal "..." (context-break marker). The presence of at least
1675// one '+' or '-' row distinguishes a real diff from an ordinary
1676// file whose lines happen to begin with a space.
1677func looksLikeUnifiedDiff(text string) bool {
1678	lines := strings.Split(text, "\n")
1679	if len(lines) < 2 {
1680		return false
1681	}
1682	sawChange := false
1683	for _, l := range lines {
1684		if l == "" {
1685			continue
1686		}
1687		if l == "..." {
1688			continue
1689		}
1690		switch l[0] {
1691		case '+', '-':
1692			sawChange = true
1693		case ' ':
1694			// context, ok
1695		default:
1696			return false
1697		}
1698	}
1699	return sawChange
1700}
1701
1702// renderUnifiedDiff renders the edit tool's context diff. Each
1703// kept row shows a line-number gutter plus a marker column: '+'
1704// for additions (colored like add), '-' for deletions (colored
1705// like remove), and unmarked context in muted type. A literal
1706// "..." line between hunks renders as an ellipsis in muted type,
1707// indicating skipped unchanged rows. The old and new line
1708// counters advance so each row carries its actual position in
1709// the pre- or post-edit file. Heuristic: when we hit a "...", we
1710// can't know where the next hunk starts, so we don't reset the
1711// counters — they stay approximate in the rare multi-hunk case.
1712func (v *View) renderUnifiedDiff(text string, width int, sourcePath string) []string {
1713	lines := strings.Split(text, "\n")
1714	if n := len(lines); n > 0 && lines[n-1] == "" {
1715		lines = lines[:n-1]
1716	}
1717	oldLine, newLine := 1, 1
1718	var out []string
1719	for _, l := range lines {
1720		if l == "" {
1721			out = append(out, "")
1722			continue
1723		}
1724		if l == "..." {
1725			out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, "..."))
1726			continue
1727		}
1728		switch l[0] {
1729		case '+':
1730			out = append(out, v.renderDiffRow(l, width, v.Theme.Tool, newLine, '+', sourcePath))
1731			newLine++
1732		case '-':
1733			out = append(out, v.renderDiffRow(l, width, v.Theme.Error, oldLine, '-', sourcePath))
1734			oldLine++
1735		case ' ':
1736			out = append(out, v.renderDiffRow(l, width, v.Theme.Muted, newLine, ' ', sourcePath))
1737			oldLine++
1738			newLine++
1739		default:
1740			for _, w := range wrapLine(l, width-4, "    ") {
1741				out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, w))
1742			}
1743		}
1744	}
1745	return out
1746}
1747
1748func looksLikeFileContent(text string) bool {
1749	if strings.TrimSpace(text) == "" {
1750		return false
1751	}
1752	lines := strings.Split(text, "\n")
1753	return len(lines) >= 2
1754}
1755
1756// renderRawFile renders file content received without embedded line
1757// numbers (the current read-tool output). Draws a muted gutter like
1758// "%6d \t" starting at startLine, highlights the code using the
1759// source path's language, and returns the formatted lines.
1760func (v *View) renderRawFile(text, sourcePath string, startLine int) []string {
1761	lines := strings.Split(text, "\n")
1762	// Drop the trailing empty line that Split produces when text ends
1763	// in "\n" so the gutter doesn't show a phantom last number.
1764	if n := len(lines); n > 0 && lines[n-1] == "" {
1765		lines = lines[:n-1]
1766	}
1767	// Split code from trailing footer lines ("... [truncated ...]")
1768	// so we don't number the footer. A single blank separator line
1769	// immediately before the footer is also pulled out so the
1770	// gutter doesn't render a phantom number for it.
1771	codeEnd := len(lines)
1772	for i := len(lines) - 1; i >= 0; i-- {
1773		if strings.HasPrefix(lines[i], "...") {
1774			codeEnd = i
1775			continue
1776		}
1777		break
1778	}
1779	if codeEnd > 0 && codeEnd < len(lines) && lines[codeEnd-1] == "" {
1780		codeEnd--
1781	}
1782	code := lines[:codeEnd]
1783	footer := lines[codeEnd:]
1784
1785	// Expand tabs to 4 spaces so Go / Makefile code renders
1786	// at a consistent width.
1787	for i, c := range code {
1788		code[i] = expandTabs(c)
1789	}
1790
1791	lang := LanguageFromPath(sourcePath)
1792	var highlighted []string
1793	if lang != "" {
1794		highlighted = v.Theme.HighlightCode(strings.Join(code, "\n"), lang)
1795		for len(highlighted) < len(code) {
1796			highlighted = append(highlighted, "")
1797		}
1798		if len(highlighted) > len(code) {
1799			highlighted = highlighted[:len(code)]
1800		}
1801	} else {
1802		highlighted = make([]string, len(code))
1803		for i, c := range code {
1804			highlighted[i] = v.Theme.FG256(v.Theme.ToolOut, c)
1805		}
1806	}
1807
1808	out := make([]string, 0, len(lines))
1809	for i, c := range highlighted {
1810		gutter := fmt.Sprintf("%4d ", startLine+i)
1811		out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, gutter)+c)
1812	}
1813	for _, f := range footer {
1814		out = append(out, "    "+v.Theme.FG256(v.Theme.Muted, f))
1815	}
1816	return out
1817}
1818
1819// toolResultBlock renders the live tool-call result body (shown
1820// while the turn is still in flight). The rules that used to
1821// bracket this block have been dropped so the live path looks
1822// identical to the transcript rendering that replaces it when
1823// the turn ends.
1824func toolResultBlock(th Theme, text string, width int, color int) []string {
1825	var out []string
1826	for _, l := range strings.Split(text, "\n") {
1827		for _, w := range wrapLine(l, width-4, "    ") {
1828			out = append(out, "    "+th.FG256(color, w))
1829		}
1830	}
1831	return out
1832}
1833
1834// ShortArgs renders a tool call's arguments into a one-line
1835// suffix for the "tool name <args>" header. tool is the tool
1836// name so we can add shape-specific decorations: for read we
1837// append the requested line range (e.g. "path:1-200") pulled
1838// from the offset/limit args, which is useful context at a
1839// glance without expanding the result body. Other tools keep
1840// the legacy "path or command, truncated at 60 cells" shape.
1841//
1842// Exported because the interactive mode pre-populates the
1843// ToolCallView.Args field with this value as soon as the tool
1844// call is announced, so the live overlay's header matches what
1845// the finalised transcript will later render.
1846func ShortArgs(tool string, raw json.RawMessage) string {
1847	var v any
1848	if err := json.Unmarshal(raw, &v); err != nil {
1849		return ""
1850	}
1851	x, ok := v.(map[string]any)
1852	if !ok {
1853		b, _ := json.Marshal(v)
1854		s := oneLineToolLabel(string(b))
1855		if len(s) > 60 {
1856			s = s[:57] + "..."
1857		}
1858		return s
1859	}
1860	var primary string
1861	for _, k := range []string{"path", "file_path", "command"} {
1862		if s, ok := x[k].(string); ok {
1863			primary = s
1864			break
1865		}
1866	}
1867	if primary == "" {
1868		b, _ := json.Marshal(v)
1869		s := oneLineToolLabel(string(b))
1870		if len(s) > 60 {
1871			s = s[:57] + "..."
1872		}
1873		return s
1874	}
1875	primary = oneLineToolLabel(primary)
1876
1877	// Tool-specific decoration. Only the read tool gets a range
1878	// suffix for now; other tools just truncate the primary arg.
1879	suffix := ""
1880	switch strings.ToLower(tool) {
1881	case "read":
1882		start := 1
1883		if n, ok := toInt(x["offset"]); ok && n >= 1 {
1884			start = n
1885		}
1886		if lim, ok := toInt(x["limit"]); ok && lim > 0 {
1887			end := start + lim - 1
1888			suffix = fmt.Sprintf(":%d-%d", start, end)
1889		} else if start > 1 {
1890			suffix = fmt.Sprintf(":%d-", start)
1891		}
1892	}
1893
1894	// Truncate the primary arg leaving room for the suffix so the
1895	// range stays visible even on absurdly long paths.
1896	max := 60 - len(suffix)
1897	if max < 10 {
1898		max = 10
1899	}
1900	if len(primary) > max {
1901		primary = primary[:max-3] + "..."
1902	}
1903	return primary + suffix
1904}
1905
1906// toInt coerces a json.Unmarshal'd number (float64) or a string
1907// containing a number into an int. Returns ok=false if the value
1908// is neither. Used by shortArgs to survive model quirks where
1909// numeric args come back as strings.
1910func toInt(v any) (int, bool) {
1911	switch n := v.(type) {
1912	case float64:
1913		return int(n), true
1914	case int:
1915		return n, true
1916	case string:
1917		i, err := strconv.Atoi(strings.TrimSpace(n))
1918		if err != nil {
1919			return 0, false
1920		}
1921		return i, true
1922	}
1923	return 0, false
1924}
1925
1926func collectText(blocks []provider.Content) string {
1927	var sb strings.Builder
1928	for _, b := range blocks {
1929		if tb, ok := b.(provider.TextBlock); ok {
1930			if sb.Len() > 0 {
1931				sb.WriteString("\n")
1932			}
1933			sb.WriteString(tb.Text)
1934		}
1935	}
1936	return sb.String()
1937}
1938
1939func truncateLines(s string, n int) string {
1940	lines := strings.Split(s, "\n")
1941	if len(lines) <= n {
1942		return s
1943	}
1944	return strings.Join(lines[:n], "\n") + "\n  ... (" + fmt.Sprintf("%d", len(lines)-n) + " more)"
1945}
1946
1947// renderCompactionBlock renders a compaction summary as a distinct
1948// visual block in the chat. When collapsed it shows a one-line label
1949// with the pre-compaction token count; when expanded (ctrl+o) it
1950// shows the full summary text.
1951func (v *View) renderCompactionBlock(m provider.Message, width int) []string {
1952	th := v.Theme
1953	const indent = "    "
1954
1955	tokens := m.Meta["tokens_before"]
1956	if tokens == "" {
1957		tokens = "?"
1958	}
1959
1960	if v.ExpandAll {
1961		var lines []string
1962		header := th.FG256(th.Muted, fmt.Sprintf("compacted from ~%s tokens", tokens))
1963		lines = append(lines, indent+header)
1964		lines = append(lines, "")
1965		for _, c := range m.Content {
1966			if tb, ok := c.(provider.TextBlock); ok {
1967				text := tb.Text
1968				if idx := strings.Index(text, "\n\n"); idx >= 0 && strings.HasPrefix(text, "## Context Summary") {
1969					text = text[idx+2:]
1970				}
1971				md := RenderMarkdown(text, th, width-4)
1972				for _, l := range strings.Split(md, "\n") {
1973					if len(l) > 0 && l[0] == FlushLeftSentinel {
1974						l = l[1:]
1975					}
1976					lines = append(lines, indent+l)
1977				}
1978			}
1979		}
1980		return lines
1981	}
1982
1983	// Collapsed: single line, no banner.
1984	line := th.FG256(th.Muted, fmt.Sprintf("compacted from ~%s tokens (ctrl+o to expand)", tokens))
1985	return []string{indent + line}
1986}
1987
1988// StatusBarParams groups the many bits of state the status bar needs.
1989// Grew from a flat argument list once we settled on the layout.
1990type StatusBarParams struct {
1991	Theme      Theme
1992	Provider   string
1993	Model      string
1994	Reasoning  string // "" means thinking off
1995	Busy       bool
1996	BusyPrefix string // spinner + funny line when busy
1997	CWD        string
1998	Locked     bool // sandbox on?
1999	NoYolo     bool // confirmation mode enabled?
2000
2001	// Cumulative session usage and cost.
2002	Usage provider.Usage
2003	// Subscription is true when the credential is an OAuth token (claude
2004	// pro/max, chatgpt plus/pro) rather than a paid api key. We still
2005	// compute a cost for visibility and append "(sub)" so the user
2006	// knows no real money moved.
2007	Subscription bool
2008
2009	// Last turn's input+cache tokens (approximates current live context).
2010	ContextUsed int
2011	ContextMax  int // model's context window; 0 disables the percentage
2012
2013	// AutoCompacting is true when the agent is currently running a
2014	// model-triggered condense pass. Surfaces as "(auto)" after the
2015	// context percentage so it's clear where the spinner is coming from.
2016	AutoCompacting bool
2017
2018	// Telegram true when the telegram bridge is connected. Adds a
2019	// small "- tg -" tag to the cwd line so the user can tell at a
2020	// glance that dms are being mirrored into this session.
2021	Telegram bool
2022
2023	Cols int // terminal width; drives right-alignment of cwd
2024}
2025
2026// StatusBar builds the status shown above the editor. Always returns
2027// two lines when a cwd is provided: the stats on the first line, the
2028// cwd on its own line below, indented to match the stats column. This
2029// keeps the status bar stable across terminal resizes (the cwd never
2030// jumps from right-aligned-on-line-1 to flush-left-on-line-2) and
2031// makes a long cwd safe at any width.
2032//
2033// Layout:
2034//
2035//	<busyPrefix>  (provider) model  stats   <- line 1
2036//	  cwd                                   <- line 2 (2-space indent)
2037//
2038// The old "ctrl+c exit - /help" / "esc cancel" hint is gone entirely.
2039// The slash-command popup and the queued/sliding-in chips already
2040// cover the discoverability of those keybindings.
2041func StatusBar(p StatusBarParams) []string {
2042	th := p.Theme
2043
2044	// Token stats: only include each segment when non-zero. Keeps
2045	// the bar compact on brand-new sessions.
2046	var stats []string
2047	if p.Usage.InputTokens > 0 {
2048		stats = append(stats, fmt.Sprintf("↑%s", formatTokens(p.Usage.InputTokens)))
2049	}
2050	if p.Usage.OutputTokens > 0 {
2051		stats = append(stats, fmt.Sprintf("↓%s", formatTokens(p.Usage.OutputTokens)))
2052	}
2053	if p.Usage.CacheReadTokens > 0 {
2054		stats = append(stats, fmt.Sprintf("R%s", formatTokens(p.Usage.CacheReadTokens)))
2055	}
2056	if p.Usage.CacheWriteTokens > 0 {
2057		stats = append(stats, fmt.Sprintf("W%s", formatTokens(p.Usage.CacheWriteTokens)))
2058	}
2059
2060	// Cost: always show the dollar value computed from token counts,
2061	// even on subscription. Lets you see what the equivalent api cost
2062	// would be (handy for gauging subscription value). Append "(sub)"
2063	// only as a hint that no real money moved.
2064	var costStr string
2065	if p.Usage.CostUSD > 0 || p.Subscription {
2066		costStr = fmt.Sprintf("$%.3f", p.Usage.CostUSD)
2067		if p.Subscription {
2068			costStr += " (sub)"
2069		}
2070	}
2071	if costStr != "" {
2072		stats = append(stats, costStr)
2073	}
2074
2075	// Context %. Color-coded: yellow >70, red >90.
2076	ctx, ctxColor := contextUsage(th, p.ContextUsed, p.ContextMax)
2077	if ctx != "" {
2078		if p.AutoCompacting {
2079			ctx += " (auto)"
2080		}
2081		stats = append(stats, th.FG256(ctxColor, ctx))
2082	}
2083
2084	// Layout uses exactly 2 spaces of horizontal padding everywhere:
2085	//   2 spaces  (openai) gpt-5.4  $0.000 (sub) 0.0%/400k  ~/Sites/zot
2086	// matches the editor prompt's left inset so the bar lines up
2087	// vertically with the conversation column.
2088	const pad = "  " // 2 spaces
2089
2090	left := fmt.Sprintf("(%s) %s", p.Provider, p.Model)
2091	thinking := thinkingLevelLabel(p.Reasoning)
2092	thinkingText := ""
2093	if thinking != "" {
2094		thinkingText = "thinking: " + thinking
2095	}
2096	statsText := strings.Join(stats, " ")
2097	middleParts := make([]string, 0, 2)
2098	if thinkingText != "" {
2099		middleParts = append(middleParts, thinkingText)
2100	}
2101	if statsText != "" {
2102		middleParts = append(middleParts, statsText)
2103	}
2104	middle := strings.Join(middleParts, "  ")
2105
2106	var leftBuilder strings.Builder
2107	if p.BusyPrefix != "" {
2108		// Don't re-color the payload itself — the caller already set
2109		// fg colors on the spinner glyph, message, and elapsed
2110		// segments. Wrapping the whole thing here would override
2111		// those choices. The pad itself needs no color (it's spaces).
2112		leftBuilder.WriteString(pad + p.BusyPrefix)
2113		// Exactly one pad (2 spaces) between the busy segment and
2114		// the provider/model block. The leading pad above covers
2115		// the left indent.
2116		leftBuilder.WriteString(pad)
2117	} else {
2118		// Idle path: a single pad of left inset so the line
2119		// aligns with the conversation column on its left edge
2120		// ("  you" / "  zot" message markers). Without the busy
2121		// prefix there's no trailing separator to double-pad.
2122		leftBuilder.WriteString(pad)
2123	}
2124	leftBuilder.WriteString(th.FG256(th.Muted, left))
2125	if middle != "" {
2126		leftBuilder.WriteString(pad)
2127		// `middle` already has colorized context segments; wrap the rest in muted.
2128		leftBuilder.WriteString(th.FG256(th.Muted, middle))
2129	}
2130
2131	cwd := shortenHome(p.CWD)
2132	tags := ""
2133	if p.NoYolo {
2134		tags += "yolo mode disabled "
2135	}
2136	if p.Locked {
2137		tags += "jailed "
2138	}
2139	if p.Telegram {
2140		tags += "telegram connected "
2141	}
2142	if tags != "" && cwd != "" {
2143		cwd = tags + "- " + cwd
2144	}
2145
2146	primary := leftBuilder.String()
2147
2148	// On narrow terminals the single line wraps badly. If the visible
2149	// width exceeds cols and we have a busy prefix, split: keep the
2150	// busy prefix on line 1, then put model and (if still needed)
2151	// stats on their own rows. This mirrors the idle split below.
2152	if p.Cols > 0 && p.BusyPrefix != "" && visibleWidth(primary) > p.Cols {
2153		busyLine := pad + p.BusyPrefix
2154		modelLine := pad + th.FG256(th.Muted, left)
2155		lines := []string{busyLine}
2156		if middle != "" && visibleWidth(modelLine+pad+th.FG256(th.Muted, middle)) > p.Cols {
2157			lines = appendWrappedStatusLines(lines, th, pad, left, thinkingText, statsText, p.Cols)
2158		} else {
2159			var infoBuilder strings.Builder
2160			infoBuilder.WriteString(modelLine)
2161			if middle != "" {
2162				infoBuilder.WriteString(pad)
2163				infoBuilder.WriteString(th.FG256(th.Muted, middle))
2164			}
2165			lines = append(lines, infoBuilder.String())
2166		}
2167		if cwd != "" {
2168			lines = append(lines, pad+th.FG256(th.Muted, cwd))
2169		}
2170		return lines
2171	}
2172
2173	// Idle narrow split: keep provider/model on the first status line,
2174	// move usage/cost/context stats to the next, then cwd below. This
2175	// avoids the terminal's hard wrap cutting the stats or pushing cwd
2176	// into an awkward position on small widths.
2177	if p.Cols > 0 && p.BusyPrefix == "" && middle != "" && visibleWidth(primary) > p.Cols {
2178		var lines []string
2179		lines = appendWrappedStatusLines(lines, th, pad, left, thinkingText, statsText, p.Cols)
2180		if cwd != "" {
2181			lines = append(lines, pad+th.FG256(th.Muted, cwd))
2182		}
2183		return lines
2184	}
2185
2186	if cwd == "" {
2187		return []string{primary}
2188	}
2189
2190	// Second line: indent with the same 2-space pad so the cwd lines
2191	// up under the "(provider)" column on line 1.
2192	cwdRendered := pad + th.FG256(th.Muted, cwd)
2193	return []string{primary, cwdRendered}
2194}
2195
2196func appendWrappedStatusLines(lines []string, th Theme, pad, modelText, thinkingText, statsText string, cols int) []string {
2197	modelLine := pad + th.FG256(th.Muted, modelText)
2198	if thinkingText == "" {
2199		lines = append(lines, modelLine)
2200		if statsText != "" {
2201			lines = append(lines, pad+th.FG256(th.Muted, statsText))
2202		}
2203		return lines
2204	}
2205
2206	modelThinkingPlain := pad + modelText + pad + thinkingText
2207	if cols <= 0 || visibleWidth(modelThinkingPlain) <= cols {
2208		lines = append(lines, pad+th.FG256(th.Muted, modelText+pad+thinkingText))
2209	} else {
2210		lines = append(lines, modelLine)
2211		lines = append(lines, pad+th.FG256(th.Muted, thinkingText))
2212	}
2213	if statsText != "" {
2214		lines = append(lines, pad+th.FG256(th.Muted, statsText))
2215	}
2216	return lines
2217}
2218
2219func thinkingLevelLabel(level string) string {
2220	switch strings.ToLower(strings.TrimSpace(level)) {
2221	case "", "off", "none", "no", "false", "disabled":
2222		return ""
2223	case "minimum", "minimal", "min":
2224		return "minimal"
2225	case "maximum", "max", "xhigh":
2226		return "maximum"
2227	default:
2228		return strings.ToLower(strings.TrimSpace(level))
2229	}
2230}
2231
2232// contextUsage renders the "N%/ctxMax" fragment, returning the
2233// rendered string plus the colour to wrap it in.
2234func contextUsage(th Theme, used, max int) (string, int) {
2235	if max <= 0 {
2236		if used <= 0 {
2237			return "", th.Muted
2238		}
2239		return formatTokens(used), th.Muted
2240	}
2241	pct := float64(used) / float64(max) * 100
2242	text := fmt.Sprintf("%.1f%%/%s", pct, formatTokens(max))
2243	switch {
2244	case pct > 90:
2245		return text, th.Error
2246	case pct > 70:
2247		return text, th.Warning
2248	}
2249	return text, th.Muted
2250}
2251
2252// formatTokens footer formatter:
2253//
2254//	< 1000      -> "42"
2255//	< 10_000    -> "2.7k"
2256//	< 1_000_000 -> "35k"
2257//	< 10M       -> "1.1M"
2258//	else        -> "12M"
2259func formatTokens(n int) string {
2260	switch {
2261	case n < 0:
2262		return "0"
2263	case n < 1000:
2264		return fmt.Sprintf("%d", n)
2265	case n < 10000:
2266		return fmt.Sprintf("%.1fk", float64(n)/1000)
2267	case n < 1_000_000:
2268		return fmt.Sprintf("%dk", (n+500)/1000)
2269	case n < 10_000_000:
2270		return fmt.Sprintf("%.1fM", float64(n)/1_000_000)
2271	default:
2272		return fmt.Sprintf("%dM", (n+500_000)/1_000_000)
2273	}
2274}
2275
2276// shortenHome replaces the user's $HOME prefix with "~" for readability.
2277func shortenHome(p string) string {
2278	if p == "" {
2279		return ""
2280	}
2281	home := osUserHome()
2282	if home == "" {
2283		return p
2284	}
2285	if p == home {
2286		return "~"
2287	}
2288	if strings.HasPrefix(p, home+"/") {
2289		return "~" + p[len(home):]
2290	}
2291	return p
2292}
2293
2294// osUserHome is a tiny wrapper around os.UserHomeDir so tests can mock it.
2295var osUserHome = func() string {
2296	if h, err := osUserHomeDir(); err == nil {
2297		return h
2298	}
2299	return ""
2300}