1package tui
2
3import (
4 "encoding/json"
5 "fmt"
6 "os"
7 "regexp"
8 "strconv"
9 "strings"
10
11 "github.com/patriceckhart/zot/internal/provider"
12)
13
14// pathFromToolArgs returns the "path" argument from a tool_call's
15// JSON arguments, or "" if the args aren't a JSON object or don't
16// include one. Used to pick a syntax language for rendering the
17// corresponding tool_result.
18func pathFromToolArgs(raw json.RawMessage) string {
19 if len(raw) == 0 {
20 return ""
21 }
22 var m map[string]any
23 if err := json.Unmarshal(raw, &m); err != nil {
24 return ""
25 }
26 for _, k := range []string{"path", "file_path"} {
27 if s, ok := m[k].(string); ok && s != "" {
28 return s
29 }
30 }
31 return ""
32}
33
34// offsetFromToolArgs returns the read tool's 1-indexed `offset`
35// arg (the first line of the slice the tool was asked to return),
36// or 0 when the call didn't specify one. Used by the tui to draw
37// the line-number gutter aligned to the right starting row, even
38// though the tool's text content itself no longer carries line
39// numbers.
40func offsetFromToolArgs(raw json.RawMessage) int {
41 if len(raw) == 0 {
42 return 0
43 }
44 var m map[string]any
45 if err := json.Unmarshal(raw, &m); err != nil {
46 return 0
47 }
48 switch v := m["offset"].(type) {
49 case float64:
50 return int(v)
51 case int:
52 return v
53 }
54 return 0
55}
56
57// osUserHomeDir is aliased so the test file can swap it.
58var osUserHomeDir = os.UserHomeDir
59
60// View turns a transcript + live state into a slice of styled lines,
61// already wrapped to width.
62type View struct {
63 Theme Theme
64 ImageProto ImageProtocol // how to render inline images in this terminal
65 Messages []provider.Message
66 // toolPaths maps tool_use_id to the "path" argument of the call, if
67 // any, so tool_result rendering can pick the right syntax language.
68 // Rebuilt on each Build().
69 toolPaths map[string]string
70 // toolStartLines maps tool_use_id to the 1-indexed first line
71 // number of a `read` result, pulled from the call's offset arg.
72 // Used by renderNumberedFile to draw a line-number gutter over
73 // raw (unnumbered) file content the model receives. Rebuilt on
74 // each Build().
75 toolStartLines map[string]int
76 Streaming string // current assistant text delta
77 StreamingActive bool
78 ToolCalls []ToolCallView // tool calls in flight or completed
79 StatusLine string
80 Err string
81
82 // ExpandAll forces every long tool result to render in full.
83 // Toggled from the tui by ctrl+o. When false, results longer than
84 // ToolCollapseLines collapse to ToolCollapsePreview lines plus a
85 // "... (N more lines, M total, ctrl+o to expand)" footer.
86 ExpandAll bool
87
88 // renderCache holds the per-message rendered line slices so Build
89 // doesn't re-markdown every message on every frame. Keyed by a
90 // struct of (content hash, width, expandAll) — any of those
91 // changing invalidates the entry. Messages are append-only after
92 // they finalise so keeping the cache across turns is safe.
93 //
94 // Streaming/in-flight work (v.Streaming, v.ToolCalls) is never
95 // cached because it changes every delta.
96 renderCache map[msgCacheKey][]string
97}
98
99// msgCacheKey identifies a cached message render. hash is a 64-bit
100// FNV-1a of the message's content, which is cheap to compute and
101// unambiguous enough for the cache (collisions produce a stale frame,
102// not wrong data, and we recompute on invalidation anyway).
103type msgCacheKey struct {
104 hash uint64
105 width int
106 expandAll bool
107}
108
109// InvalidateRenderCache drops all cached message renders. The tui
110// calls this when the transcript is replaced wholesale (/compact,
111// /clear, session swap) since messages can be replaced in place and
112// a content-hash miss alone doesn't reclaim the old entries.
113func (v *View) InvalidateRenderCache() {
114 v.renderCache = nil
115}
116
117// ToolCollapsePreview is the number of lines shown before a long tool
118// result is replaced with a "... ctrl+o to expand" footer. Tool
119// results shorter than ToolCollapseLines always render in full.
120const (
121 ToolCollapsePreview = 10
122 ToolCollapseLines = 12
123)
124
125// ToolCallView is a pending tool invocation plus optional result.
126type ToolCallView struct {
127 ID string
128 Name string
129 Args string // rendered argument summary
130 Result string // rendered result preview (truncated)
131 Error bool
132 Done bool
133
134 // Streaming is true while the model is still typing the tool
135 // call's JSON arguments. The TUI renders a live preview of any
136 // interesting string fields (for `write`, the `content`; for
137 // `bash`, the `command`) so the user can watch the file being
138 // composed. Set to false as soon as EvToolUseEnd arrives.
139 Streaming bool
140
141 // RawJSONBuf is the accumulator of every EvToolUseArgs delta
142 // the stream has delivered for this tool call. Used by the
143 // partial-JSON extractor to peel off the live string value
144 // of one named field on each render.
145 RawJSONBuf string
146
147 // LivePath is the `path` arg extracted as soon as it parses
148 // out of RawJSONBuf. Shown next to the tool name in the header
149 // so the user can see which file is being written to.
150 LivePath string
151}
152
153// MessageAnchor records where a rendered message starts in the chat
154// line slice. Used by /jump so the dialog can scroll the viewport to
155// the row where a turn's user prompt begins.
156type MessageAnchor struct {
157 MessageIdx int // index into v.Messages
158 Row int // first row of that message in the Build() output
159}
160
161// Build returns the chat log lines for the given width.
162func (v *View) Build(width int) []string {
163 lines, _ := v.BuildWithAnchors(width)
164 return lines
165}
166
167// BuildWithAnchors is like Build but additionally reports the first
168// row occupied by each message in v.Messages. Callers that need to
169// scroll to a specific turn (the /jump dialog) use the anchor slice
170// to map a message index back to a row offset.
171func (v *View) BuildWithAnchors(width int) ([]string, []MessageAnchor) {
172 v.refreshToolPaths()
173 if v.renderCache == nil {
174 v.renderCache = make(map[msgCacheKey][]string)
175 }
176
177 // Pre-render every message (hits the cache for unchanged ones) so
178 // we can allocate `out` in a single shot with the exact capacity.
179 // Growing via append on a long transcript copies the backing array
180 // log2(N) times; for a 2000-line scrollback that's enough memcpy
181 // to visibly stutter while typing.
182 rendered := make([][]string, len(v.Messages))
183 total := 0
184 for idx, m := range v.Messages {
185 lines := v.renderMessageCached(m, width)
186 rendered[idx] = lines
187 total += len(lines) + 1 // +1 for the blank separator row
188 }
189
190 out := make([]string, 0, total+16)
191 anchors := make([]MessageAnchor, 0, len(v.Messages))
192 for idx := range v.Messages {
193 anchors = append(anchors, MessageAnchor{MessageIdx: idx, Row: len(out)})
194 out = append(out, rendered[idx]...)
195 out = append(out, "")
196 }
197 // Only render the streaming header/body when there's actual
198 // text to show. An empty streaming block (streamOn=true,
199 // Streaming="") appears when a turn starts with a tool_use
200 // block instead of text — in that case the live tool-call
201 // overlay below is the real content and a naked "zot" bar
202 // above it reads as a stray empty message.
203 if v.StreamingActive && strings.TrimSpace(v.Streaming) != "" {
204 out = append(out, v.Theme.FG256(v.Theme.Assistant, "▍ zot"))
205 // Stream the partial assistant text through the same markdown
206 // renderer used for finalised messages so code fences, diffs,
207 // lists, and inline styles look the same while streaming and
208 // don't suddenly reflow when the turn ends. Indent matches the
209 // finalised assistant body in renderMessage so the column
210 // stays consistent across the stream/finalise transition.
211 // Width is capped so ultra-wide terminals don't produce
212 // edge-to-edge rules / unreadably long prose lines.
213 const indent = " "
214 inner := assistantBodyWidth(width - len(indent))
215 md := RenderMarkdown(v.Streaming, v.Theme, inner)
216 for _, l := range strings.Split(md, "\n") {
217 for _, w := range wrapLine(l, inner, "") {
218 out = append(out, indent+w)
219 }
220 }
221 out = append(out, "")
222 }
223 // Live tool-call overlay: skip any entry whose assistant
224 // tool_use block OR tool_result has already made it into the
225 // transcript. The EvAssistantMessage for a tool-use turn
226 // lands BEFORE executeTools runs, so between that moment and
227 // the tool-result being appended the overlay and the
228 // finalised transcript both render the same call. Checking
229 // for either side of the pair suppresses the duplicate in
230 // both windows.
231 finalised := map[string]bool{}
232 for _, m := range v.Messages {
233 for _, c := range m.Content {
234 switch b := c.(type) {
235 case provider.ToolCallBlock:
236 finalised[b.ID] = true
237 case provider.ToolResultBlock:
238 finalised[b.CallID] = true
239 }
240 }
241 }
242 for _, tc := range v.ToolCalls {
243 if finalised[tc.ID] {
244 continue
245 }
246 out = append(out, v.renderToolCall(tc, width)...)
247 out = append(out, "")
248 }
249 if v.Err != "" {
250 out = append(out, v.Theme.FG256(v.Theme.Error, "✖ "+v.Err))
251 out = append(out, "")
252 }
253 return out, anchors
254}
255
256// refreshToolPaths rebuilds the tool_use_id -> path map from the
257// current transcript. Called once per Build() so tool result blocks
258// (which may be cached) can look up their syntax language when they
259// were originally rendered. Walking the transcript here is O(N) but
260// cheap compared to markdown/chroma work it enables.
261func (v *View) refreshToolPaths() {
262 v.toolPaths = map[string]string{}
263 v.toolStartLines = map[string]int{}
264 for _, m := range v.Messages {
265 for _, c := range m.Content {
266 if tc, ok := c.(provider.ToolCallBlock); ok {
267 if p := pathFromToolArgs(tc.Arguments); p != "" {
268 v.toolPaths[tc.ID] = p
269 }
270 if off := offsetFromToolArgs(tc.Arguments); off >= 1 {
271 v.toolStartLines[tc.ID] = off
272 }
273 }
274 }
275 }
276}
277
278// renderMessageCached returns the rendered line slice for m, using the
279// cache if the same (content hash, width, expandAll) combination has
280// been rendered before. The slice returned is shared — callers must
281// not mutate it; Build() only ever appends to its own `out` so the
282// shared slice is safe.
283func (v *View) renderMessageCached(m provider.Message, width int) []string {
284 key := msgCacheKey{
285 hash: hashMessage(m),
286 width: width,
287 expandAll: v.ExpandAll,
288 }
289 if v.renderCache != nil {
290 if lines, ok := v.renderCache[key]; ok {
291 return lines
292 }
293 }
294 lines := v.renderMessage(m, width)
295 if v.renderCache != nil {
296 // Bound the cache: 4x the current message count is enough to
297 // survive /compact churn without leaking memory across a very
298 // long session.
299 max := len(v.Messages) * 4
300 if max < 32 {
301 max = 32
302 }
303 if len(v.renderCache) > max {
304 // Drop half the entries. map iteration order gives us a
305 // pseudo-LRU for free.
306 dropped := 0
307 target := len(v.renderCache) / 2
308 for k := range v.renderCache {
309 if dropped >= target {
310 break
311 }
312 delete(v.renderCache, k)
313 dropped++
314 }
315 }
316 v.renderCache[key] = lines
317 }
318 return lines
319}
320
321// hashMessage returns a 64-bit FNV-1a over the role + content blocks
322// of m. Serialising each block to its salient bytes is enough: two
323// messages with the same role and same content render identically.
324func hashMessage(m provider.Message) uint64 {
325 h := fnv64aInit
326 h = fnv64aWrite(h, []byte(m.Role))
327 h = fnv64aWriteByte(h, 0)
328 for _, c := range m.Content {
329 switch b := c.(type) {
330 case provider.TextBlock:
331 h = fnv64aWriteByte(h, 't')
332 h = fnv64aWrite(h, []byte(b.Text))
333 case provider.ImageBlock:
334 h = fnv64aWriteByte(h, 'i')
335 h = fnv64aWrite(h, []byte(b.MimeType))
336 h = fnv64aWrite(h, b.Data)
337 case provider.ToolCallBlock:
338 h = fnv64aWriteByte(h, 'c')
339 h = fnv64aWrite(h, []byte(b.ID))
340 h = fnv64aWrite(h, []byte(b.Name))
341 h = fnv64aWrite(h, []byte(b.Arguments))
342 case provider.ToolResultBlock:
343 h = fnv64aWriteByte(h, 'r')
344 h = fnv64aWrite(h, []byte(b.CallID))
345 if b.IsError {
346 h = fnv64aWriteByte(h, 'E')
347 }
348 for _, inner := range b.Content {
349 switch ib := inner.(type) {
350 case provider.TextBlock:
351 h = fnv64aWrite(h, []byte(ib.Text))
352 case provider.ImageBlock:
353 h = fnv64aWrite(h, []byte(ib.MimeType))
354 h = fnv64aWrite(h, ib.Data)
355 }
356 }
357 }
358 h = fnv64aWriteByte(h, 0)
359 }
360 return h
361}
362
363// FNV-1a implementation inlined so we don't pay the interface cost of
364// hash.Hash64 on every Build(). The whole point here is speed.
365const (
366 fnv64aInit uint64 = 0xcbf29ce484222325
367 fnv64aPrime uint64 = 0x100000001b3
368)
369
370// assistantBodyRightPad is the blank gutter kept on the right
371// side of every assistant prose line so text doesn't kiss the
372// terminal edge. Matches the 4-cell left indent, so a line of
373// fully-wrapped prose sits in a symmetric column.
374const assistantBodyRightPad = 4
375
376// assistantBodyWidth returns the usable width for the assistant
377// message body (markdown prose + code fences). Uses the full
378// column width passed in minus assistantBodyRightPad, clamped
379// at 1 so wrap helpers don't divide by zero on absurdly narrow
380// terminals. The right-side padding keeps a small breathing
381// column to the terminal edge that mirrors the left indent.
382func assistantBodyWidth(outer int) int {
383 outer -= assistantBodyRightPad
384 if outer < 1 {
385 return 1
386 }
387 return outer
388}
389
390func fnv64aWriteByte(h uint64, b byte) uint64 {
391 h ^= uint64(b)
392 h *= fnv64aPrime
393 return h
394}
395
396func fnv64aWrite(h uint64, p []byte) uint64 {
397 for _, b := range p {
398 h ^= uint64(b)
399 h *= fnv64aPrime
400 }
401 return h
402}
403
404func (v *View) renderMessage(m provider.Message, width int) []string {
405 var lines []string
406 switch m.Role {
407 case provider.RoleUser:
408 header := v.Theme.FG256(v.Theme.User, "▍ you")
409 lines = append(lines, header)
410 for _, c := range m.Content {
411 switch b := c.(type) {
412 case provider.TextBlock:
413 for _, l := range strings.Split(b.Text, "\n") {
414 for _, w := range wrapLine(l, width-2, " ") {
415 lines = append(lines, " "+v.Theme.FG256(v.Theme.Muted, w))
416 }
417 }
418 case provider.ImageBlock:
419 lines = append(lines, " "+v.Theme.FG256(v.Theme.Muted, fmt.Sprintf("[image %s, %d bytes]", b.MimeType, len(b.Data))))
420 }
421 }
422 case provider.RoleAssistant:
423 header := v.Theme.FG256(v.Theme.Assistant, "▍ zot")
424 lines = append(lines, header)
425 // Indent assistant body the same 4 cells the user body uses,
426 // so the conversation column lines up vertically. The width
427 // passed into the markdown renderer / wrap is reduced by the
428 // indent so long lines wrap inside the indented column, and
429 // capped so ultra-wide terminals don't produce edge-to-edge
430 // code-fence rules or unreadably long prose lines.
431 const indent = " "
432 inner := assistantBodyWidth(width - len(indent))
433 for _, c := range m.Content {
434 switch b := c.(type) {
435 case provider.TextBlock:
436 md := RenderMarkdown(b.Text, v.Theme, inner)
437 for _, l := range strings.Split(md, "\n") {
438 for _, w := range wrapLine(l, inner, "") {
439 lines = append(lines, indent+w)
440 }
441 }
442 case provider.ToolCallBlock:
443 // Rule above the tool header frames the call as a
444 // self-contained block separating it from the
445 // assistant prose above. The matching closing rule
446 // is emitted at the end of the tool-role message.
447 lines = append(lines, toolBlockRule(v.Theme, width))
448 lines = append(lines, indent+v.Theme.FG256(v.Theme.Tool, "▸ "+b.Name+" "+ShortArgs(b.Name, b.Arguments)))
449 }
450 }
451 case provider.RoleTool:
452 for _, c := range m.Content {
453 if tr, ok := c.(provider.ToolResultBlock); ok {
454 color := v.Theme.ToolOut
455 if tr.IsError {
456 color = v.Theme.Error
457 }
458 path := ""
459 if v.toolPaths != nil {
460 path = v.toolPaths[tr.CallID]
461 }
462 startLine := 1
463 if v.toolStartLines != nil {
464 if s := v.toolStartLines[tr.CallID]; s > 0 {
465 startLine = s
466 }
467 }
468 // Render the body directly under the tool-call
469 // header (no "result" sub-header). Errors keep a
470 // one-line header so they're distinguishable from
471 // successful output. A closing rule below the body
472 // pairs with the opening rule emitted above the
473 // tool-call header in the assistant message,
474 // framing the whole tool block.
475 if tr.IsError {
476 lines = append(lines, v.Theme.FG256(color, " error"))
477 }
478 lines = append(lines, v.renderToolResultContent(tr.Content, width, color, path, startLine)...)
479 lines = append(lines, toolBlockRule(v.Theme, width))
480 }
481 }
482 }
483 return lines
484}
485
486func (v *View) renderToolCall(tc ToolCallView, width int) []string {
487 var lines []string
488
489 // Header. While the call is still streaming, prefer the live path
490 // extracted from the partial args so the user sees the target
491 // file as soon as it's known, even before the full JSON arrived.
492 arg := tc.Args
493 if arg == "" && tc.LivePath != "" {
494 arg = tc.LivePath
495 }
496 head := v.Theme.FG256(v.Theme.Tool, "▸ "+tc.Name+" "+arg)
497
498 // Live streaming body: pulled out of the partial JSON buffer for
499 // tools whose interesting content is a string field (currently
500 // write's `content` and edit's `new_text` chunks). The body is
501 // already framed by wrapLiveBody with top+bottom rules, so we
502 // don't add the extra toolBlockRule around it — that would
503 // produce four rules per streaming block, with a visible doubled
504 // line at the bottom.
505 if tc.Streaming && tc.Result == "" {
506 lines = append(lines, head)
507 if body := v.renderLiveToolBody(tc, width); len(body) > 0 {
508 lines = append(lines, body...)
509 }
510 return lines
511 }
512
513 // Finished tool call: frame the whole block with opening +
514 // closing rules so it stands apart from surrounding assistant
515 // prose. Matches the transcript-side framing in renderMessage.
516 lines = append(lines, toolBlockRule(v.Theme, width))
517 lines = append(lines, head)
518 if tc.Result != "" {
519 color := v.Theme.ToolOut
520 if tc.Error {
521 color = v.Theme.Error
522 }
523 body := toolResultBlock(v.Theme, tc.Result, width, color)
524 lines = append(lines, v.collapseToolBody(body, false)...)
525 }
526 lines = append(lines, toolBlockRule(v.Theme, width))
527 return lines
528}
529
530// renderLiveToolBody renders the in-flight preview of a streaming
531// tool call. Supported tools:
532//
533// - write: shows the partial `content` field, syntax-highlighted
534// by the target path's language.
535// - edit: shows the partial `newText` of the edit currently being
536// streamed, prefixed with a "editing foo.ts (edit 2)" header so
537// the user can see which of a multi-edit batch is in progress.
538//
539// Anything else returns nil and only the tool-call header shows.
540func (v *View) renderLiveToolBody(tc ToolCallView, width int) []string {
541 switch tc.Name {
542 case "write", "Write":
543 partial, ok, _ := ExtractPartialStringField(tc.RawJSONBuf, "content")
544 if !ok || partial == "" {
545 return nil
546 }
547 return v.wrapLiveBody(v.renderRawFile(partial, tc.LivePath, 1), width)
548 case "edit", "Edit":
549 partial, ok, _, idx := ExtractLastNewText(tc.RawJSONBuf)
550 if !ok || partial == "" {
551 return nil
552 }
553 // Header line hints which edit is streaming and, when more
554 // than one has landed, how many the model is doing.
555 hint := fmt.Sprintf(" edit %d (streaming)", idx)
556 body := []string{v.Theme.FG256(v.Theme.Muted, hint), ""}
557 body = append(body, v.renderRawFile(partial, tc.LivePath, 1)...)
558 return v.wrapLiveBody(body, width)
559 }
560 return nil
561}
562
563// wrapLiveBody wraps a list of content lines with the standard
564// wrapLiveBody wraps a list of content lines with the standard
565// tool-result rules (top + bottom), collapsing to the preview
566// height if the body is tall. Shared between write and edit
567// streaming.
568func (v *View) wrapLiveBody(body []string, width int) []string {
569 body = v.collapseToolBody(body, false)
570 rule := v.Theme.FG256(v.Theme.Muted, strings.Repeat("─", width))
571 out := make([]string, 0, len(body)+2)
572 out = append(out, rule)
573 out = append(out, body...)
574 out = append(out, rule)
575 return out
576}
577
578// toolResultBlock wraps text in thin horizontal rules (top + bottom),
579// indenting the body with four spaces. The rules span the content column.
580// toolBlockRule renders the muted horizontal separator drawn
581// above and below a tool call block. Spans the full content
582// width so it reads as a real section break in the chat
583// regardless of terminal size.
584func toolBlockRule(th Theme, width int) string {
585 w := width
586 if w < 8 {
587 w = 8
588 }
589 return th.FG256(th.Muted, strings.Repeat("─", w))
590}
591
592// renderToolResultContent renders the body of a tool result block.
593// Text blocks get the usual rules-wrapped treatment; text that looks
594// like a unified diff gets +/- coloring. Image blocks are rendered
595// inline when the terminal supports a protocol, else as a text
596// placeholder with dimensions.
597func (v *View) renderToolResultContent(blocks []provider.Content, width, color int, sourcePath string, startLine int) []string {
598 var body []string
599 hasImage := false
600 for _, b := range blocks {
601 switch bb := b.(type) {
602 case provider.TextBlock:
603 body = append(body, v.renderToolText(bb.Text, width, color, sourcePath, startLine)...)
604 case provider.ImageBlock:
605 hasImage = true
606 body = append(body, v.renderImageBlock(bb, width)...)
607 }
608 }
609 return v.collapseToolBody(body, hasImage)
610}
611
612// collapseToolBody trims lines to the configured preview size when the
613// view is not in ExpandAll mode, appending a muted "... ctrl+o to
614// expand" footer. Image blocks never collapse — they're short in text
615// rows but represent real content the user wants to see.
616func (v *View) collapseToolBody(lines []string, hasImage bool) []string {
617 if v.ExpandAll || hasImage {
618 return lines
619 }
620 if len(lines) <= ToolCollapseLines {
621 return lines
622 }
623 kept := lines[:ToolCollapsePreview]
624 hidden := len(lines) - ToolCollapsePreview
625 total := len(lines)
626 footer := fmt.Sprintf(" ... (%d more lines, %d total, ctrl+o to expand)", hidden, total)
627 footer = v.Theme.FG256(v.Theme.Muted, footer)
628 return append(append([]string(nil), kept...), footer)
629}
630
631// renderToolText renders a text block inside a tool result. If the
632// text contains a unified-diff section (lines starting with "--- " /
633// "+++ " / "+" / "-"/" "), those rows are styled with add/remove
634// colors matching git diff conventions.
635func (v *View) renderToolText(text string, width, defaultColor int, sourcePath string, startLine int) []string {
636 // Legacy path: transcripts saved before we dropped line numbers
637 // from the read tool still carry " 1\t…" prefixes. Detect and
638 // strip them, then fall through to the highlighter.
639 if looksLikeNumberedFile(text) {
640 return v.renderNumberedFile(text, sourcePath)
641 }
642 // If the result embeds a unified diff (the edit tool's output
643 // starts with a short "applied N edit(s)" line and then a
644 // standard --- / +++ / +/- patch), render the patch with
645 // add/remove coloring. This takes priority over the file-like
646 // detector below because a diff technically has many lines of
647 // "file content" but what the user cares about is what changed,
648 // not a dump of the post-edit file.
649 if looksLikeUnifiedDiff(text) {
650 return v.renderUnifiedDiff(text, width, sourcePath)
651 }
652
653 // Current path: text came from `read` as raw file bytes. When a
654 // source path is known (the call had a `path` arg), render with
655 // a synthetic line-number gutter starting at startLine so the
656 // on-screen view still looks like cat -n. Doesn't apply to non-
657 // file tool outputs (bash stdout, display notes, etc.).
658 if sourcePath != "" && looksLikeFileContent(text) {
659 return v.renderRawFile(text, sourcePath, startLine)
660 }
661
662 // No truncation — the full tool output is rendered into chat and
663 // becomes part of the scrollback you can page back through.
664 lines := strings.Split(text, "\n")
665
666 // Bash-result styling: when the first row looks like a shell
667 // prompt line ("$ ...") emitted by the bash tool, style the
668 // prompt line in accent and the trailing "[exit N] Took X.Ys"
669 // line in muted type so the command + timing read at a glance.
670 // Everything between is left on the default tool-output color.
671 if len(lines) > 0 && strings.HasPrefix(lines[0], "$ ") {
672 return v.renderBashResult(lines, width, defaultColor)
673 }
674
675 inDiff := false
676 oldLine, newLine := 1, 1
677 var out []string
678 for _, l := range lines {
679 // Detect diff header: "--- name" followed somewhere by "+++ name".
680 if strings.HasPrefix(l, "--- ") || strings.HasPrefix(l, "+++ ") {
681 inDiff = true
682 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, l))
683 continue
684 }
685 // Hunk header "@@ -a,b +c,d @@" resets the counters so patches
686 // that skip around in the file still get correct numbering.
687 if inDiff && strings.HasPrefix(l, "@@") {
688 if o, n, ok := parseHunkHeader(l); ok {
689 oldLine, newLine = o, n
690 }
691 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, l))
692 continue
693 }
694 if inDiff && len(l) > 0 {
695 switch l[0] {
696 case '+':
697 out = append(out, v.renderDiffRow(l, width, v.Theme.Tool, newLine, '+', sourcePath))
698 newLine++
699 continue
700 case '-':
701 out = append(out, v.renderDiffRow(l, width, v.Theme.Error, oldLine, '-', sourcePath))
702 oldLine++
703 continue
704 case ' ':
705 out = append(out, v.renderDiffRow(l, width, v.Theme.Muted, newLine, ' ', sourcePath))
706 oldLine++
707 newLine++
708 continue
709 }
710 }
711 // Regular line.
712 for _, w := range wrapLine(l, width-4, " ") {
713 out = append(out, " "+v.Theme.FG256(defaultColor, w))
714 }
715 }
716 return out
717}
718
719// parseHunkHeader extracts the starting old/new line from a unified
720// diff hunk header ("@@ -12,5 +12,7 @@ ..."). Returns ok=false if the
721// header is malformed or missing numbers.
722func parseHunkHeader(l string) (oldStart, newStart int, ok bool) {
723 // Skip "@@ "
724 rest := strings.TrimPrefix(l, "@@")
725 rest = strings.TrimSpace(rest)
726 if !strings.HasPrefix(rest, "-") {
727 return 0, 0, false
728 }
729 rest = rest[1:]
730 space := strings.IndexByte(rest, ' ')
731 if space < 0 {
732 return 0, 0, false
733 }
734 oldPart := rest[:space]
735 rest = strings.TrimSpace(rest[space+1:])
736 if !strings.HasPrefix(rest, "+") {
737 return 0, 0, false
738 }
739 rest = rest[1:]
740 if sp := strings.IndexAny(rest, " \t"); sp >= 0 {
741 rest = rest[:sp]
742 }
743 parseStart := func(s string) (int, bool) {
744 if c := strings.IndexByte(s, ','); c >= 0 {
745 s = s[:c]
746 }
747 n, err := strconv.Atoi(s)
748 if err != nil || n < 1 {
749 return 0, false
750 }
751 return n, true
752 }
753 o, ok1 := parseStart(oldPart)
754 n, ok2 := parseStart(rest)
755 if !ok1 || !ok2 {
756 return 0, 0, false
757 }
758 return o, n, true
759}
760
761// renderDiffRow renders one unified-diff line with a read-style gutter
762// (6-cell right-aligned line number, muted) followed by the +/-/space
763// marker and the code. Code is syntax-highlighted if sourcePath hints
764// at a known language; falls back to the plain diff color otherwise.
765func (v *View) renderDiffRow(line string, width, color int, lineNo int, mark byte, sourcePath string) string {
766 if len(line) == 0 {
767 return ""
768 }
769 code := line[1:] // strip the leading marker; we re-emit it in colour
770
771 // Syntax-highlight the code half when we know the language. Use
772 // the same HighlightCode pipeline as renderNumberedFile so the
773 // palette matches.
774 lang := LanguageFromPath(sourcePath)
775 var codeRendered string
776 if lang != "" {
777 if h := HighlightCode(code, lang); len(h) == 1 {
778 codeRendered = h[0]
779 }
780 }
781 if codeRendered == "" {
782 if mark == ' ' {
783 codeRendered = v.Theme.FG256(v.Theme.Muted, code)
784 } else {
785 codeRendered = v.Theme.FG256(color, code)
786 }
787 }
788
789 // Gutter shape: sign + number share a color so they read as one
790 // visual token ("+123") instead of a neutral line number next to
791 // a stray marker. Unchanged context lines get a muted gutter and
792 // a leading space so column alignment stays consistent with +/-
793 // rows.
794 var gutterText string
795 switch mark {
796 case '+':
797 gutterText = fmt.Sprintf("+%5d\t", lineNo)
798 case '-':
799 gutterText = fmt.Sprintf("-%5d\t", lineNo)
800 default:
801 gutterText = fmt.Sprintf(" %5d\t", lineNo)
802 }
803 var gutter string
804 if mark == ' ' {
805 gutter = v.Theme.FG256(v.Theme.Muted, gutterText)
806 } else {
807 gutter = v.Theme.FG256(color, gutterText)
808 }
809 row := " " + gutter + codeRendered
810
811 // Cheap width clamp: truncate visible text if the raw code is too
812 // long. We work on the pre-ANSI code string because measuring ansi
813 // output is unreliable.
814 maxCode := width - 4 /* indent */ - 7 /* gutter (sign+5 digits+tab) */
815 if maxCode > 0 && len(code) > maxCode {
816 trunc := code[:maxCode-1] + "…"
817 if lang != "" {
818 if h := HighlightCode(trunc, lang); len(h) == 1 {
819 codeRendered = h[0]
820 } else if mark == ' ' {
821 codeRendered = v.Theme.FG256(v.Theme.Muted, trunc)
822 } else {
823 codeRendered = v.Theme.FG256(color, trunc)
824 }
825 } else if mark == ' ' {
826 codeRendered = v.Theme.FG256(v.Theme.Muted, trunc)
827 } else {
828 codeRendered = v.Theme.FG256(color, trunc)
829 }
830 row = " " + gutter + codeRendered
831 }
832 return row
833}
834
835// renderImageBlock returns the lines for one image, inline if possible.
836//
837// Inline image escapes paint into multiple terminal rows but the zot
838// renderer treats each slice entry as a single row. To prevent chat
839// content from being drawn on top of the image, we pad with blank rows
840// so the image's real footprint is reflected in the frame height.
841func (v *View) renderImageBlock(b provider.ImageBlock, width int) []string {
842 w, h := ImageDimensions(b.Data)
843 kb := len(b.Data) / 1024
844 info := fmt.Sprintf(" image · %s · %dx%d · %d KB", b.MimeType, w, h, kb)
845
846 if v.ImageProto != ImageProtocolNone {
847 // Clamp rendered width so the image never overflows the chat
848 // column. Subtract a 4-cell indent for the tool result block,
849 // cap at 60 cells, floor at 10.
850 cells := width - 4
851 if cells > 60 {
852 cells = 60
853 }
854 if cells < 10 {
855 cells = 10
856 }
857 const maxRows = 20
858 if seq := RenderInlineImageScaled(v.ImageProto, b.Data, b.MimeType, cells, maxRows); seq != "" {
859 rows := RowsForInlineImage(b.Data, cells, maxRows)
860 if rows < 1 {
861 rows = 1
862 }
863 out := make([]string, 0, rows+1)
864 out = append(out, " "+seq)
865 // Reserve blank rows matching the image's on-screen height.
866 for i := 1; i < rows; i++ {
867 out = append(out, "")
868 }
869 out = append(out, v.Theme.FG256(v.Theme.Muted, info))
870 return out
871 }
872 }
873 // Text fallback.
874 return []string{v.Theme.FG256(v.Theme.Muted, info)}
875}
876
877// looksLikeNumberedFile returns true when text matches the `read`
878// tool's " N\tcontent" format for most of its lines.
879func looksLikeNumberedFile(text string) bool {
880 lines := strings.Split(text, "\n")
881 if len(lines) == 0 {
882 return false
883 }
884 hits := 0
885 scanned := 0
886 for _, l := range lines {
887 if l == "" {
888 continue
889 }
890 scanned++
891 if scanned > 20 {
892 break
893 }
894 if numberedLineRE.MatchString(l) {
895 hits++
896 }
897 }
898 if scanned == 0 {
899 return false
900 }
901 return hits*2 >= scanned // majority of non-empty lines match
902}
903
904var numberedLineRE = regexp.MustCompile(`^\s*\d+\t`)
905
906// renderNumberedFile strips line numbers, highlights the code, and
907// re-attaches the line numbers in muted color.
908func (v *View) renderNumberedFile(text, sourcePath string) []string {
909 lines := strings.Split(text, "\n")
910 gutters := make([]string, 0, len(lines))
911 codes := make([]string, 0, len(lines))
912 for _, l := range lines {
913 idx := strings.IndexByte(l, '\t')
914 if idx < 0 || !numberedLineRE.MatchString(l) {
915 // Non-code footer (e.g. "[truncated at 2000 lines]").
916 gutters = append(gutters, "")
917 codes = append(codes, l)
918 continue
919 }
920 gutter := l[:idx+1] // keep the tab so alignment is preserved
921 code := l[idx+1:]
922 gutters = append(gutters, gutter)
923 codes = append(codes, code)
924 }
925 lang := LanguageFromPath(sourcePath)
926 var highlighted []string
927 if lang != "" {
928 highlighted = HighlightCode(strings.Join(codes, "\n"), lang)
929 // Chroma sometimes collapses the trailing empty line. Pad to
930 // align with the gutter slice so per-line zipping works.
931 for len(highlighted) < len(codes) {
932 highlighted = append(highlighted, "")
933 }
934 if len(highlighted) > len(codes) {
935 highlighted = highlighted[:len(codes)]
936 }
937 } else {
938 // No lexer for this file type — render in the ToolOut color so
939 // code is visually distinct from the muted gutter.
940 highlighted = make([]string, len(codes))
941 for i, c := range codes {
942 highlighted[i] = v.Theme.FG256(v.Theme.ToolOut, c)
943 }
944 }
945 out := make([]string, 0, len(codes))
946 for i, code := range highlighted {
947 g := gutters[i]
948 if g == "" {
949 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, code))
950 continue
951 }
952 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, g)+code)
953 }
954 return out
955}
956
957// looksLikeFileContent is a cheap guard to distinguish a read-tool
958// result from bash stdout or a status message. File content usually
959// contains characters that status messages don't (code punctuation,
960// longer lines, multiple lines) and rarely starts with the " >"-
961// or "error:"-style prefixes tools emit. False positives are OK,
962// the worst case is a line-number gutter on something that isn't
963// really code.
964// renderBashResult styles a bash tool result: the "$ command" first
965// line in the accent color, the trailing "[exit N] Took X.Ys" line
966// in muted type, everything else on the default tool-output color.
967// Called from renderToolText when the first line starts with "$ ".
968func (v *View) renderBashResult(lines []string, width, defaultColor int) []string {
969 // Identify the footer line (exit + timing). The bash tool writes
970 // it as the last non-empty line of the result.
971 footerIdx := -1
972 for i := len(lines) - 1; i >= 0; i-- {
973 trimmed := strings.TrimSpace(lines[i])
974 if trimmed == "" {
975 continue
976 }
977 if strings.HasPrefix(trimmed, "[exit ") {
978 footerIdx = i
979 }
980 break
981 }
982
983 var out []string
984 for i, l := range lines {
985 switch {
986 case i == 0 && strings.HasPrefix(l, "$ "):
987 // Style the $ and the command text in accent. No
988 // further processing / wrapping so the shell-style
989 // prompt reads at a glance.
990 for _, w := range wrapLine(l, width-4, " ") {
991 out = append(out, " "+v.Theme.FG256(v.Theme.Accent, w))
992 }
993 case i == footerIdx:
994 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, l))
995 default:
996 for _, w := range wrapLine(l, width-4, " ") {
997 out = append(out, " "+v.Theme.FG256(defaultColor, w))
998 }
999 }
1000 }
1001 return out
1002}
1003
1004// looksLikeUnifiedDiff reports whether text is a context diff as
1005// emitted by the edit tool: rows start with '+', '-', ' ', or
1006// literal "..." (context-break marker). The presence of at least
1007// one '+' or '-' row distinguishes a real diff from an ordinary
1008// file whose lines happen to begin with a space.
1009func looksLikeUnifiedDiff(text string) bool {
1010 lines := strings.Split(text, "\n")
1011 if len(lines) < 2 {
1012 return false
1013 }
1014 sawChange := false
1015 for _, l := range lines {
1016 if l == "" {
1017 continue
1018 }
1019 if l == "..." {
1020 continue
1021 }
1022 switch l[0] {
1023 case '+', '-':
1024 sawChange = true
1025 case ' ':
1026 // context, ok
1027 default:
1028 return false
1029 }
1030 }
1031 return sawChange
1032}
1033
1034// renderUnifiedDiff renders the edit tool's context diff. Each
1035// kept row shows a line-number gutter plus a marker column: '+'
1036// for additions (colored like add), '-' for deletions (colored
1037// like remove), and unmarked context in muted type. A literal
1038// "..." line between hunks renders as an ellipsis in muted type,
1039// indicating skipped unchanged rows. The old and new line
1040// counters advance so each row carries its actual position in
1041// the pre- or post-edit file. Heuristic: when we hit a "...", we
1042// can't know where the next hunk starts, so we don't reset the
1043// counters — they stay approximate in the rare multi-hunk case.
1044func (v *View) renderUnifiedDiff(text string, width int, sourcePath string) []string {
1045 lines := strings.Split(text, "\n")
1046 if n := len(lines); n > 0 && lines[n-1] == "" {
1047 lines = lines[:n-1]
1048 }
1049 oldLine, newLine := 1, 1
1050 var out []string
1051 for _, l := range lines {
1052 if l == "" {
1053 out = append(out, "")
1054 continue
1055 }
1056 if l == "..." {
1057 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, "…"))
1058 continue
1059 }
1060 switch l[0] {
1061 case '+':
1062 out = append(out, v.renderDiffRow(l, width, v.Theme.Tool, newLine, '+', sourcePath))
1063 newLine++
1064 case '-':
1065 out = append(out, v.renderDiffRow(l, width, v.Theme.Error, oldLine, '-', sourcePath))
1066 oldLine++
1067 case ' ':
1068 out = append(out, v.renderDiffRow(l, width, v.Theme.Muted, newLine, ' ', sourcePath))
1069 oldLine++
1070 newLine++
1071 default:
1072 for _, w := range wrapLine(l, width-4, " ") {
1073 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, w))
1074 }
1075 }
1076 }
1077 return out
1078}
1079
1080func looksLikeFileContent(text string) bool {
1081 if strings.TrimSpace(text) == "" {
1082 return false
1083 }
1084 lines := strings.Split(text, "\n")
1085 return len(lines) >= 2
1086}
1087
1088// renderRawFile renders file content received without embedded line
1089// numbers (the current read-tool output). Draws a muted gutter like
1090// "%6d \t" starting at startLine, highlights the code using the
1091// source path's language, and returns the formatted lines.
1092func (v *View) renderRawFile(text, sourcePath string, startLine int) []string {
1093 lines := strings.Split(text, "\n")
1094 // Drop the trailing empty line that Split produces when text ends
1095 // in "\n" so the gutter doesn't show a phantom last number.
1096 if n := len(lines); n > 0 && lines[n-1] == "" {
1097 lines = lines[:n-1]
1098 }
1099 // Split code from trailing footer lines ("... [truncated ...]")
1100 // so we don't number the footer.
1101 codeEnd := len(lines)
1102 for i := len(lines) - 1; i >= 0; i-- {
1103 if strings.HasPrefix(lines[i], "...") {
1104 codeEnd = i
1105 continue
1106 }
1107 break
1108 }
1109 code := lines[:codeEnd]
1110 footer := lines[codeEnd:]
1111
1112 lang := LanguageFromPath(sourcePath)
1113 var highlighted []string
1114 if lang != "" {
1115 highlighted = HighlightCode(strings.Join(code, "\n"), lang)
1116 for len(highlighted) < len(code) {
1117 highlighted = append(highlighted, "")
1118 }
1119 if len(highlighted) > len(code) {
1120 highlighted = highlighted[:len(code)]
1121 }
1122 } else {
1123 highlighted = make([]string, len(code))
1124 for i, c := range code {
1125 highlighted[i] = v.Theme.FG256(v.Theme.ToolOut, c)
1126 }
1127 }
1128
1129 out := make([]string, 0, len(lines))
1130 for i, c := range highlighted {
1131 gutter := fmt.Sprintf("%6d\t", startLine+i)
1132 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, gutter)+c)
1133 }
1134 for _, f := range footer {
1135 out = append(out, " "+v.Theme.FG256(v.Theme.Muted, f))
1136 }
1137 return out
1138}
1139
1140// toolResultBlock renders the live tool-call result body (shown
1141// while the turn is still in flight). The rules that used to
1142// bracket this block have been dropped so the live path looks
1143// identical to the transcript rendering that replaces it when
1144// the turn ends.
1145func toolResultBlock(th Theme, text string, width int, color int) []string {
1146 var out []string
1147 for _, l := range strings.Split(text, "\n") {
1148 for _, w := range wrapLine(l, width-4, " ") {
1149 out = append(out, " "+th.FG256(color, w))
1150 }
1151 }
1152 return out
1153}
1154
1155// ShortArgs renders a tool call's arguments into a one-line
1156// suffix for the "tool name <args>" header. tool is the tool
1157// name so we can add shape-specific decorations: for read we
1158// append the requested line range (e.g. "path:1-200") pulled
1159// from the offset/limit args, which is useful context at a
1160// glance without expanding the result body. Other tools keep
1161// the legacy "path or command, truncated at 60 cells" shape.
1162//
1163// Exported because the interactive mode pre-populates the
1164// ToolCallView.Args field with this value as soon as the tool
1165// call is announced, so the live overlay's header matches what
1166// the finalised transcript will later render.
1167func ShortArgs(tool string, raw json.RawMessage) string {
1168 var v any
1169 if err := json.Unmarshal(raw, &v); err != nil {
1170 return ""
1171 }
1172 x, ok := v.(map[string]any)
1173 if !ok {
1174 b, _ := json.Marshal(v)
1175 s := string(b)
1176 if len(s) > 60 {
1177 s = s[:57] + "..."
1178 }
1179 return s
1180 }
1181 var primary string
1182 for _, k := range []string{"path", "file_path", "command"} {
1183 if s, ok := x[k].(string); ok {
1184 primary = s
1185 break
1186 }
1187 }
1188 if primary == "" {
1189 b, _ := json.Marshal(v)
1190 s := string(b)
1191 if len(s) > 60 {
1192 s = s[:57] + "..."
1193 }
1194 return s
1195 }
1196
1197 // Tool-specific decoration. Only the read tool gets a range
1198 // suffix for now; other tools just truncate the primary arg.
1199 suffix := ""
1200 switch strings.ToLower(tool) {
1201 case "read":
1202 start := 1
1203 if n, ok := toInt(x["offset"]); ok && n >= 1 {
1204 start = n
1205 }
1206 if lim, ok := toInt(x["limit"]); ok && lim > 0 {
1207 end := start + lim - 1
1208 suffix = fmt.Sprintf(":%d-%d", start, end)
1209 } else if start > 1 {
1210 suffix = fmt.Sprintf(":%d-", start)
1211 }
1212 }
1213
1214 // Truncate the primary arg leaving room for the suffix so the
1215 // range stays visible even on absurdly long paths.
1216 max := 60 - len(suffix)
1217 if max < 10 {
1218 max = 10
1219 }
1220 if len(primary) > max {
1221 primary = primary[:max-3] + "..."
1222 }
1223 return primary + suffix
1224}
1225
1226// toInt coerces a json.Unmarshal'd number (float64) or a string
1227// containing a number into an int. Returns ok=false if the value
1228// is neither. Used by shortArgs to survive model quirks where
1229// numeric args come back as strings.
1230func toInt(v any) (int, bool) {
1231 switch n := v.(type) {
1232 case float64:
1233 return int(n), true
1234 case int:
1235 return n, true
1236 case string:
1237 i, err := strconv.Atoi(strings.TrimSpace(n))
1238 if err != nil {
1239 return 0, false
1240 }
1241 return i, true
1242 }
1243 return 0, false
1244}
1245
1246func collectText(blocks []provider.Content) string {
1247 var sb strings.Builder
1248 for _, b := range blocks {
1249 if tb, ok := b.(provider.TextBlock); ok {
1250 if sb.Len() > 0 {
1251 sb.WriteString("\n")
1252 }
1253 sb.WriteString(tb.Text)
1254 }
1255 }
1256 return sb.String()
1257}
1258
1259func truncateLines(s string, n int) string {
1260 lines := strings.Split(s, "\n")
1261 if len(lines) <= n {
1262 return s
1263 }
1264 return strings.Join(lines[:n], "\n") + "\n … (" + fmt.Sprintf("%d", len(lines)-n) + " more)"
1265}
1266
1267// StatusBarParams groups the many bits of state the status bar needs.
1268// Grew from a flat argument list once we settled on the layout.
1269type StatusBarParams struct {
1270 Theme Theme
1271 Provider string
1272 Model string
1273 Busy bool
1274 BusyPrefix string // spinner + funny line when busy
1275 CWD string
1276 Locked bool // sandbox on?
1277
1278 // Cumulative session usage and cost.
1279 Usage provider.Usage
1280 // Subscription is true when the credential is an OAuth token (claude
1281 // pro/max, chatgpt plus/pro) rather than a paid api key. We still
1282 // compute a cost for visibility and append "(sub)" so the user
1283 // knows no real money moved.
1284 Subscription bool
1285
1286 // Last turn's input+cache tokens (approximates current live context).
1287 ContextUsed int
1288 ContextMax int // model's context window; 0 disables the percentage
1289
1290 // AutoCompacting is true when the agent is currently running a
1291 // model-triggered condense pass. Surfaces as "(auto)" after the
1292 // context percentage so it's clear where the spinner is coming from.
1293 AutoCompacting bool
1294
1295 // Telegram true when the telegram bridge is connected. Adds a
1296 // small "· tg ·" tag to the cwd line so the user can tell at a
1297 // glance that dms are being mirrored into this session.
1298 Telegram bool
1299
1300 Cols int // terminal width; drives right-alignment of cwd
1301}
1302
1303// StatusBar builds the status shown above the editor. Always returns
1304// two lines when a cwd is provided: the stats on the first line, the
1305// cwd on its own line below, indented to match the stats column. This
1306// keeps the status bar stable across terminal resizes (the cwd never
1307// jumps from right-aligned-on-line-1 to flush-left-on-line-2) and
1308// makes a long cwd safe at any width.
1309//
1310// Layout:
1311//
1312// <busyPrefix> (provider) model stats <- line 1
1313// cwd <- line 2 (2-space indent)
1314//
1315// The old "ctrl+c exit - /help" / "esc cancel" hint is gone entirely.
1316// The slash-command popup and the queued/sliding-in chips already
1317// cover the discoverability of those keybindings.
1318func StatusBar(p StatusBarParams) []string {
1319 th := p.Theme
1320
1321 // Token stats: only include each segment when non-zero. Keeps
1322 // the bar compact on brand-new sessions.
1323 var stats []string
1324 if p.Usage.InputTokens > 0 {
1325 stats = append(stats, fmt.Sprintf("↑%s", formatTokens(p.Usage.InputTokens)))
1326 }
1327 if p.Usage.OutputTokens > 0 {
1328 stats = append(stats, fmt.Sprintf("↓%s", formatTokens(p.Usage.OutputTokens)))
1329 }
1330 if p.Usage.CacheReadTokens > 0 {
1331 stats = append(stats, fmt.Sprintf("R%s", formatTokens(p.Usage.CacheReadTokens)))
1332 }
1333 if p.Usage.CacheWriteTokens > 0 {
1334 stats = append(stats, fmt.Sprintf("W%s", formatTokens(p.Usage.CacheWriteTokens)))
1335 }
1336
1337 // Cost: always show the dollar value computed from token counts,
1338 // even on subscription. Lets you see what the equivalent api cost
1339 // would be (handy for gauging subscription value). Append "(sub)"
1340 // only as a hint that no real money moved.
1341 var costStr string
1342 if p.Usage.CostUSD > 0 || p.Subscription {
1343 costStr = fmt.Sprintf("$%.3f", p.Usage.CostUSD)
1344 if p.Subscription {
1345 costStr += " (sub)"
1346 }
1347 }
1348 if costStr != "" {
1349 stats = append(stats, costStr)
1350 }
1351
1352 // Context %. Color-coded: yellow >70, red >90.
1353 ctx, ctxColor := contextUsage(th, p.ContextUsed, p.ContextMax)
1354 if ctx != "" {
1355 if p.AutoCompacting {
1356 ctx += " (auto)"
1357 }
1358 stats = append(stats, th.FG256(ctxColor, ctx))
1359 }
1360
1361 // Layout uses exactly 2 spaces of horizontal padding everywhere:
1362 // 2 spaces (openai) gpt-5.4 $0.000 (sub) 0.0%/400k ~/Sites/zot
1363 // matches the editor prompt's left inset so the bar lines up
1364 // vertically with the conversation column.
1365 const pad = " " // 2 spaces
1366
1367 left := fmt.Sprintf("(%s) %s", p.Provider, p.Model)
1368 middle := strings.Join(stats, " ")
1369
1370 var leftBuilder strings.Builder
1371 if p.BusyPrefix != "" {
1372 // Don't re-color the payload itself — the caller already set
1373 // fg colors on the spinner glyph, message, and elapsed
1374 // segments. Wrapping the whole thing here would override
1375 // those choices. The pad itself needs no color (it's spaces).
1376 leftBuilder.WriteString(pad + p.BusyPrefix)
1377 leftBuilder.WriteString(pad)
1378 }
1379 leftBuilder.WriteString(pad)
1380 leftBuilder.WriteString(th.FG256(th.Muted, left))
1381 if middle != "" {
1382 leftBuilder.WriteString(pad)
1383 // `middle` already has colorized context segments; wrap the rest in muted.
1384 leftBuilder.WriteString(th.FG256(th.Muted, middle))
1385 }
1386
1387 cwd := shortenHome(p.CWD)
1388 tags := ""
1389 if p.Locked {
1390 tags += "· jailed "
1391 }
1392 if p.Telegram {
1393 tags += "· tg "
1394 }
1395 if tags != "" && cwd != "" {
1396 cwd = tags + "· " + cwd
1397 }
1398
1399 primary := leftBuilder.String()
1400 if cwd == "" {
1401 return []string{primary}
1402 }
1403
1404 // Second line: indent with the same 2-space pad so the cwd lines
1405 // up under the "(provider)" column on line 1.
1406 cwdRendered := pad + th.FG256(th.Muted, cwd)
1407 return []string{primary, cwdRendered}
1408}
1409
1410// contextUsage renders the "N%/ctxMax" fragment, returning the
1411// rendered string plus the colour to wrap it in.
1412func contextUsage(th Theme, used, max int) (string, int) {
1413 if max <= 0 {
1414 if used <= 0 {
1415 return "", th.Muted
1416 }
1417 return formatTokens(used), th.Muted
1418 }
1419 pct := float64(used) / float64(max) * 100
1420 text := fmt.Sprintf("%.1f%%/%s", pct, formatTokens(max))
1421 switch {
1422 case pct > 90:
1423 return text, th.Error
1424 case pct > 70:
1425 return text, th.Warning
1426 }
1427 return text, th.Muted
1428}
1429
1430// formatTokens footer formatter:
1431//
1432// < 1000 -> "42"
1433// < 10_000 -> "2.7k"
1434// < 1_000_000 -> "35k"
1435// < 10M -> "1.1M"
1436// else -> "12M"
1437func formatTokens(n int) string {
1438 switch {
1439 case n < 0:
1440 return "0"
1441 case n < 1000:
1442 return fmt.Sprintf("%d", n)
1443 case n < 10000:
1444 return fmt.Sprintf("%.1fk", float64(n)/1000)
1445 case n < 1_000_000:
1446 return fmt.Sprintf("%dk", (n+500)/1000)
1447 case n < 10_000_000:
1448 return fmt.Sprintf("%.1fM", float64(n)/1_000_000)
1449 default:
1450 return fmt.Sprintf("%dM", (n+500_000)/1_000_000)
1451 }
1452}
1453
1454// shortenHome replaces the user's $HOME prefix with "~" for readability.
1455func shortenHome(p string) string {
1456 if p == "" {
1457 return ""
1458 }
1459 home := osUserHome()
1460 if home == "" {
1461 return p
1462 }
1463 if p == home {
1464 return "~"
1465 }
1466 if strings.HasPrefix(p, home+"/") {
1467 return "~" + p[len(home):]
1468 }
1469 return p
1470}
1471
1472// osUserHome is a tiny wrapper around os.UserHomeDir so tests can mock it.
1473var osUserHome = func() string {
1474 if h, err := osUserHomeDir(); err == nil {
1475 return h
1476 }
1477 return ""
1478}