1package view
2
3import (
4 "encoding/base64"
5 "fmt"
6 "io"
7 "mime/quotedprintable"
8 "os"
9 "regexp"
10 "strings"
11 "sync/atomic"
12 "time"
13
14 "charm.land/lipgloss/v2"
15 "github.com/floatpane/matcha/clib"
16 "github.com/floatpane/matcha/internal/httpclient"
17 "github.com/floatpane/matcha/internal/loglevel"
18 "github.com/floatpane/matcha/theme"
19 lru "github.com/hashicorp/golang-lru/v2"
20)
21
22const termGhostty = "ghostty"
23
24func linkStyle() lipgloss.Style {
25 return lipgloss.NewStyle().Foreground(theme.ActiveTheme.Link)
26}
27
28// getTerminalCellSize returns the height of a terminal cell in pixels.
29// It queries the terminal using TIOCGWINSZ to get both character and pixel dimensions.
30// Falls back to a default of 18 pixels if the query fails.
31func getTerminalCellSize() int {
32 const defaultCellHeight = 18
33
34 // Try stdout, stdin, stderr, then /dev/tty as last resort
35 fds := []int{int(os.Stdout.Fd()), int(os.Stdin.Fd()), int(os.Stderr.Fd())}
36
37 for _, fd := range fds {
38 if cellHeight := getCellHeightFromFd(fd); cellHeight > 0 {
39 return cellHeight
40 }
41 }
42
43 // Try /dev/tty directly - this works even when stdio is redirected (e.g., in Bubble Tea)
44 if tty, err := os.Open("/dev/tty"); err == nil {
45 defer tty.Close() //nolint:errcheck
46 if cellHeight := getCellHeightFromFd(int(tty.Fd())); cellHeight > 0 {
47 return cellHeight
48 }
49 }
50
51 debugImageProtocol("using default cell height: %d pixels", defaultCellHeight)
52 return defaultCellHeight
53}
54
55// hyperlinkSupported checks if the terminal supports OSC 8 hyperlinks.
56func hyperlinkSupported() bool {
57 term := strings.ToLower(os.Getenv("TERM"))
58
59 // Terminals known to support OSC 8 hyperlinks
60 supportedTerms := []string{
61 "kitty",
62 termGhostty,
63 "wezterm",
64 "alacritty",
65 "foot",
66 "tmux",
67 "screen",
68 }
69
70 for _, supported := range supportedTerms {
71 if strings.Contains(term, supported) {
72 return true
73 }
74 }
75
76 // Check for specific terminal programs
77 termProgram := strings.ToLower(os.Getenv("TERM_PROGRAM"))
78 supportedPrograms := []string{
79 "iterm.app",
80 "hyper",
81 "vscode",
82 termGhostty,
83 "wezterm",
84 }
85
86 for _, supported := range supportedPrograms {
87 if strings.Contains(termProgram, supported) {
88 return true
89 }
90 }
91
92 // Check for VTE-based terminals (GNOME Terminal, etc.)
93 if os.Getenv("VTE_VERSION") != "" {
94 return true
95 }
96
97 // Check for specific environment variables that indicate hyperlink support
98 if os.Getenv("KITTY_WINDOW_ID") != "" ||
99 os.Getenv("GHOSTTY_RESOURCES_DIR") != "" ||
100 os.Getenv("WEZTERM_EXECUTABLE") != "" ||
101 os.Getenv("WT_SESSION") != "" {
102 return true
103 }
104
105 return false
106}
107
108// hyperlink formats a string as either a terminal-clickable hyperlink or plain text with URL.
109func hyperlink(url, text string) string {
110 if text == "" {
111 text = url
112 }
113
114 supported := hyperlinkSupported()
115
116 if supported {
117 // Use OSC 8 hyperlink sequence for supported terminals
118 return fmt.Sprintf("\x1b]8;;%s\x07%s\x1b]8;;\x07", url, linkStyle().Render(text))
119 }
120 // Fallback to plain text format for unsupported terminals
121 if text == url {
122 return fmt.Sprintf("<%s>", linkStyle().Render(url))
123 }
124 return fmt.Sprintf("%s <%s>", linkStyle().Render(text), linkStyle().Render(url))
125}
126
127func decodeQuotedPrintable(s string) (string, error) {
128 reader := quotedprintable.NewReader(strings.NewReader(s))
129 body, err := io.ReadAll(reader)
130 if err != nil {
131 return "", err
132 }
133 return string(body), nil
134}
135
136// markdownToHTML converts a Markdown string to an HTML string using md4c (C).
137func markdownToHTML(md []byte) []byte {
138 return clib.MarkdownToHTML(md)
139}
140
141func kittySupported() bool {
142 term := strings.ToLower(os.Getenv("TERM"))
143 if strings.Contains(term, "kitty") {
144 return true
145 }
146 return os.Getenv("KITTY_WINDOW_ID") != ""
147}
148
149func ghosttySupported() bool {
150 // Check for TERM containing ghostty
151 term := strings.ToLower(os.Getenv("TERM"))
152 if strings.Contains(term, termGhostty) {
153 return true
154 }
155
156 // Check for Ghostty-specific environment variables
157 if os.Getenv("TERM_PROGRAM") == termGhostty {
158 return true
159 }
160
161 // Check for GHOSTTY_RESOURCES_DIR which Ghostty sets
162 return os.Getenv("GHOSTTY_RESOURCES_DIR") != ""
163}
164
165func iterm2Supported() bool {
166 termProgram := strings.ToLower(os.Getenv("TERM_PROGRAM"))
167 if termProgram == "iterm.app" {
168 return true
169 }
170
171 // Check for iTerm2-specific environment variables
172 if os.Getenv("ITERM_SESSION_ID") != "" || os.Getenv("ITERM_PROFILE") != "" {
173 return true
174 }
175
176 return false
177}
178
179func weztermSupported() bool {
180 // Check for WezTerm-specific environment variables
181 if os.Getenv("WEZTERM_EXECUTABLE") != "" || os.Getenv("WEZTERM_CONFIG_FILE") != "" {
182 return true
183 }
184
185 termProgram := strings.ToLower(os.Getenv("TERM_PROGRAM"))
186 if termProgram == "wezterm" {
187 return true
188 }
189
190 term := strings.ToLower(os.Getenv("TERM"))
191 return strings.Contains(term, "wezterm")
192}
193
194func waystSupported() bool {
195 term := strings.ToLower(os.Getenv("TERM"))
196 if strings.Contains(term, "wayst") {
197 return true
198 }
199
200 termProgram := strings.ToLower(os.Getenv("TERM_PROGRAM"))
201 return termProgram == "wayst"
202}
203
204func warpSupported() bool {
205 termProgram := strings.ToLower(os.Getenv("TERM_PROGRAM"))
206 if termProgram == "warp" {
207 return true
208 }
209
210 // Check for Warp-specific environment variables
211 if os.Getenv("WARP_IS_LOCAL_SHELL_SESSION") != "" || os.Getenv("WARP_COMBINED_PROMPT_COMMAND_FINISHED") != "" {
212 return true
213 }
214
215 return false
216}
217
218func konsoleSupported() bool {
219 // Check for Konsole-specific environment variables
220 if os.Getenv("KONSOLE_DBUS_SESSION") != "" || os.Getenv("KONSOLE_VERSION") != "" {
221 return true
222 }
223
224 termProgram := strings.ToLower(os.Getenv("TERM_PROGRAM"))
225 return termProgram == "konsole"
226}
227
228func zellijSupported() bool {
229 return os.Getenv("ZELLIJ") != "" || os.Getenv("ZELLIJ_SESSION_NAME") != ""
230}
231
232func sixelSupported() bool {
233 // Zellij always supports Sixel
234 if zellijSupported() {
235 return true
236 }
237
238 // Native Sixel terminals
239 term := strings.ToLower(os.Getenv("TERM"))
240 return strings.Contains(term, "mlterm") ||
241 strings.Contains(term, "foot") ||
242 (strings.Contains(term, "xterm") && os.Getenv("SIXEL") == "1")
243}
244
245// ImageProtocolSupported checks if any supported image protocol terminal is detected.
246func ImageProtocolSupported() bool {
247 return imageProtocolSupported()
248}
249
250// SixelSupported returns true if the terminal uses the Sixel graphics protocol.
251func SixelSupported() bool {
252 return sixelSupported()
253}
254
255// imageProtocolSupported checks if any supported image protocol terminal is detected.
256func imageProtocolSupported() bool {
257 return sixelSupported() || kittySupported() || ghosttySupported() || iterm2Supported() ||
258 weztermSupported() || waystSupported() || warpSupported() || konsoleSupported()
259}
260
261func debugImageProtocol(format string, args ...interface{}) {
262 if os.Getenv("DEBUG_IMAGE_PROTOCOL") == "" && os.Getenv("DEBUG_KITTY_IMAGES") == "" {
263 return
264 }
265 msg := fmt.Sprintf("[img-protocol] "+format+"\n", args...)
266 loglevel.Infof("%s", strings.TrimSuffix(msg, "\n"))
267 if path := os.Getenv("DEBUG_IMAGE_PROTOCOL_LOG"); path != "" {
268 if f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644); err == nil { //nolint:gosec
269 _, _ = f.WriteString(msg)
270 _ = f.Close()
271 }
272 } else if path := os.Getenv("DEBUG_KITTY_LOG"); path != "" {
273 if f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644); err == nil { //nolint:gosec
274 _, _ = f.WriteString(msg)
275 _ = f.Close()
276 }
277 }
278}
279
280const remoteImageCacheSize = 20
281
282// remoteImageCache caches fetched remote images (URL -> base64 PNG string).
283var remoteImageCache *lru.Cache[string, string]
284
285func init() {
286 c, err := lru.New[string, string](remoteImageCacheSize)
287 if err != nil {
288 panic(err) // only fails on size <= 0
289 }
290 remoteImageCache = c
291}
292
293// nextImageID is an auto-incrementing counter for Kitty image IDs.
294var nextImageID uint32 = 1000
295
296// allocImageID returns a unique Kitty image ID.
297func allocImageID() uint32 {
298 return atomic.AddUint32(&nextImageID, 1)
299}
300
301func fetchRemoteBase64(url string) string {
302 if !strings.HasPrefix(url, "http://") && !strings.HasPrefix(url, "https://") {
303 return ""
304 }
305
306 // Check cache first
307 if cached, ok := remoteImageCache.Get(url); ok {
308 debugImageProtocol("remote cache hit url=%s", url)
309 return cached
310 }
311
312 client := httpclient.New(httpclient.RemoteImageTimeout)
313 resp, err := client.Get(url)
314 if err != nil {
315 debugImageProtocol("remote fetch failed url=%s err=%v", url, err)
316 return ""
317 }
318 defer resp.Body.Close() //nolint:errcheck
319 if resp.StatusCode < 200 || resp.StatusCode >= 300 {
320 debugImageProtocol("remote fetch non-200 url=%s status=%d", url, resp.StatusCode)
321 return ""
322 }
323 // Limit response body to 10 MB to prevent memory exhaustion from
324 // malicious or very large images.
325 const maxImageSize = 10 << 20 // 10 MB
326 data, err := io.ReadAll(io.LimitReader(resp.Body, maxImageSize))
327 if err != nil {
328 debugImageProtocol("remote fetch read error url=%s err=%v", url, err)
329 return ""
330 }
331
332 result, ok := clib.DecodeToPNG(data)
333 if !ok {
334 debugImageProtocol("remote decode failed url=%s", url)
335 return ""
336 }
337
338 encoded := base64.StdEncoding.EncodeToString(result.PNGData)
339 debugImageProtocol("remote fetch ok url=%s len=%d", url, len(encoded))
340 remoteImageCache.Add(url, encoded)
341 return encoded
342}
343
344func dataURIBase64(uri string) string {
345 if !strings.HasPrefix(uri, "data:") {
346 return ""
347 }
348 comma := strings.Index(uri, ",")
349 if comma == -1 || comma+1 >= len(uri) {
350 return ""
351 }
352 return uri[comma+1:]
353}
354
355// imageRowPlaceholderPrefix is used to mark where image row spacing should be inserted.
356// This prevents the newline-collapsing regex from removing intentional spacing.
357// Uses brackets instead of angle brackets to avoid being interpreted as HTML tags.
358const imageRowPlaceholderPrefix = "[[MATCHA_IMG_ROWS:"
359const imageRowPlaceholderSuffix = "]]"
360
361// sixelImageEscapeOnly returns raw Sixel for out-of-band rendering
362func sixelImageEscapeOnly(base64PNG string) string {
363 data, err := base64.StdEncoding.DecodeString(base64PNG)
364 if err != nil {
365 return ""
366 }
367
368 cellHeight := getTerminalCellSize()
369 sixel, _, err := clib.EncodePNGToSixel(data, cellHeight)
370 if err != nil {
371 return ""
372 }
373
374 return sixel
375}
376
377// imageRows calculates the number of terminal rows an image occupies.
378func imageRows(payload string) int {
379 rows := 1
380 if data, err := base64.StdEncoding.DecodeString(payload); err == nil {
381 if _, h, ok := clib.ImageDimensions(data); ok {
382 cellHeight := getTerminalCellSize()
383 if cellHeight == 0 {
384 cellHeight = 16
385 }
386 rows = (h + cellHeight - 1) / cellHeight
387 if rows < 1 {
388 rows = 1
389 }
390 debugImageProtocol("image height: %d pixels, cell height: %d pixels, rows needed: %d", h, cellHeight, rows)
391 }
392 }
393 return rows
394}
395
396// kittyUploadImage uploads image data to the terminal with a unique ID using
397// the Kitty graphics protocol transmit action (a=t). The image is stored in
398// the terminal's memory and can be displayed later by ID without re-sending data.
399func kittyUploadImage(payload string, id uint32) {
400 if payload == "" {
401 return
402 }
403
404 const chunkSize = 4096
405 for offset := 0; offset < len(payload); offset += chunkSize {
406 end := offset + chunkSize
407 if end > len(payload) {
408 end = len(payload)
409 }
410 more := "0"
411 if end < len(payload) {
412 more = "1"
413 }
414
415 chunk := payload[offset:end]
416 if offset == 0 {
417 // a=t: transmit (upload) only, don't display yet
418 // i=ID: assign this image ID
419 fmt.Fprintf(os.Stdout, "\x1b_Gf=100,a=t,i=%d,q=2,m=%s;%s\x1b\\", id, more, chunk) //nolint:errcheck
420 } else {
421 fmt.Fprintf(os.Stdout, "\x1b_Gm=%s;%s\x1b\\", more, chunk) //nolint:errcheck
422 }
423 }
424 os.Stdout.Sync() //nolint:errcheck,gosec
425}
426
427// kittyDisplayImage displays a previously uploaded image by its ID at the
428// current cursor position. This is very fast since no image data is transmitted.
429func kittyDisplayImage(id uint32) string {
430 // a=p: put (display) an already-uploaded image by ID
431 // C=1: cursor does not move
432 return fmt.Sprintf("\x1b_Ga=p,i=%d,q=2,C=1\x1b\\", id)
433}
434
435// iterm2ImageEscapeOnly returns only the iTerm2 image protocol escape sequence
436// without any row placeholders. Used for out-of-band rendering to stdout.
437func iterm2ImageEscapeOnly(payload string) string {
438 if payload == "" {
439 return ""
440 }
441 return fmt.Sprintf("\x1b]1337;File=inline=1:%s\x07", payload)
442}
443
444// RenderImageToStdout writes an image directly to stdout at the given screen
445// row using cursor positioning. This bypasses bubbletea's cell-based renderer
446// which cannot handle graphics protocol escape sequences.
447//
448// For Kitty-protocol terminals, images are uploaded once and then displayed by
449// ID on subsequent calls, making scroll rendering nearly instant.
450func RenderImageToStdout(placement *ImagePlacement, screenRow int, screenCol ...int) {
451 if placement.Base64 == "" {
452 return
453 }
454
455 col := 1
456 if len(screenCol) > 0 && screenCol[0] > 0 {
457 col = screenCol[0]
458 }
459
460 // Priority: Sixel in multiplexers
461 if sixelSupported() {
462 debugImageProtocol("Sixel: RenderImageToStdout row=%d col=%d base64len=%d", screenRow, col, len(placement.Base64))
463
464 // Encode once, reuse cached Sixel on subsequent renders (like Kitty's upload-once pattern)
465 if placement.SixelEncoded == "" {
466 placement.SixelEncoded = sixelImageEscapeOnly(placement.Base64)
467 if placement.SixelEncoded == "" {
468 debugImageProtocol("Sixel: sixelImageEscapeOnly returned empty")
469 return
470 }
471 }
472
473 debugImageProtocol("Sixel: rendering %d bytes at row=%d col=%d", len(placement.SixelEncoded), screenRow+1, col)
474 // Position cursor + render Sixel
475 fmt.Fprintf(os.Stdout, "\x1b[s\x1b[%d;%dH%s\x1b[u", //nolint:errcheck
476 screenRow+1, col, placement.SixelEncoded)
477 os.Stdout.Sync() //nolint:errcheck,gosec
478 return
479 }
480
481 useKitty := kittySupported() || ghosttySupported() || weztermSupported() || waystSupported() || konsoleSupported()
482 useIterm2 := iterm2Supported() || warpSupported()
483
484 if useKitty {
485 // Upload once, display by ID on subsequent renders
486 if !placement.Uploaded {
487 placement.ID = allocImageID()
488 kittyUploadImage(placement.Base64, placement.ID)
489 placement.Uploaded = true
490 }
491 seq := kittyDisplayImage(placement.ID)
492 fmt.Fprintf(os.Stdout, "\x1b[s\x1b[%d;%dH%s\x1b[u", screenRow+1, col, seq) //nolint:errcheck
493 os.Stdout.Sync() //nolint:errcheck,gosec
494 } else if useIterm2 {
495 seq := iterm2ImageEscapeOnly(placement.Base64)
496 fmt.Fprintf(os.Stdout, "\x1b[s\x1b[%d;%dH%s\x1b[u", screenRow+1, col, seq) //nolint:errcheck
497 os.Stdout.Sync() //nolint:errcheck,gosec
498 }
499}
500
501// expandImageRowPlaceholders replaces image row placeholders with actual newlines.
502func expandImageRowPlaceholders(text string) string {
503 re := regexp.MustCompile(regexp.QuoteMeta(imageRowPlaceholderPrefix) + `(\d+)` + regexp.QuoteMeta(imageRowPlaceholderSuffix))
504 return re.ReplaceAllStringFunc(text, func(match string) string {
505 // Extract the number of rows from the placeholder
506 numStr := strings.TrimPrefix(match, imageRowPlaceholderPrefix)
507 numStr = strings.TrimSuffix(numStr, imageRowPlaceholderSuffix)
508 rows := 1
509 if _, err := fmt.Sscanf(numStr, "%d", &rows); err != nil || rows < 1 {
510 rows = 1
511 }
512 // Return the newlines needed to push content below the image
513 return strings.Repeat("\n", rows)
514 })
515}
516
517type InlineImage struct {
518 CID string
519 Base64 string
520}
521
522// ImagePlacement holds the data needed to render an image at a specific
523// line in the email body. Images are rendered directly to stdout (bypassing
524// bubbletea's cell-based renderer which cannot handle graphics protocols).
525type ImagePlacement struct {
526 Line int // Line number in the processed body text where the image starts
527 Base64 string // Base64-encoded image data (PNG)
528 Rows int // Number of terminal rows the image occupies
529 Uploaded bool // Whether the image has been uploaded to the terminal via Kitty ID
530 ID uint32 // Kitty image ID for display-by-reference
531 SixelEncoded string // Cached Sixel escape sequence (encode once, reuse on scroll)
532}
533
534// BodyMIMEType values understood by ProcessBody/ProcessBodyWithInline. Empty
535// string means "unknown" — the renderer falls back to running markdownToHTML
536// before HTML parsing, which is correct for plaintext-with-markdown bodies but
537// can mangle complex HTML (e.g. tables with attribute-heavy <td style="...">).
538const (
539 BodyMIMETypeHTML = "text/html"
540 BodyMIMETypePlain = "text/plain"
541)
542
543// ProcessBodyWithInline renders the body and resolves CID inline images when provided.
544// Returns the rendered body text, image placements for out-of-band rendering, and any error.
545// mimeType is "text/html", "text/plain", or "" (unknown — falls back to legacy markdown→HTML pre-pass).
546func ProcessBodyWithInline(rawBody, mimeType string, inline []InlineImage, h1Style, h2Style, bodyStyle lipgloss.Style, disableImages bool) (string, []ImagePlacement, error) {
547 inlineMap := make(map[string]string, len(inline))
548 for _, img := range inline {
549 cid := strings.TrimSpace(img.CID)
550 cid = strings.TrimPrefix(cid, "<")
551 cid = strings.TrimSuffix(cid, ">")
552 cid = strings.TrimPrefix(cid, "cid:")
553 if cid == "" || img.Base64 == "" {
554 continue
555 }
556 inlineMap[cid] = img.Base64
557 }
558 return processBody(rawBody, mimeType, inlineMap, h1Style, h2Style, bodyStyle, disableImages)
559}
560
561// ProcessBody takes a raw email body, decodes it, and formats it as plain
562// text with terminal hyperlinks.
563// mimeType is "text/html", "text/plain", or "" (unknown — falls back to legacy markdown→HTML pre-pass).
564func ProcessBody(rawBody, mimeType string, h1Style, h2Style, bodyStyle lipgloss.Style, disableImages bool) (string, []ImagePlacement, error) {
565 return processBody(rawBody, mimeType, nil, h1Style, h2Style, bodyStyle, disableImages)
566}
567
568func processBody(rawBody, mimeType string, inline map[string]string, h1Style, h2Style, bodyStyle lipgloss.Style, disableImages bool) (string, []ImagePlacement, error) {
569 decodedBody, err := decodeQuotedPrintable(rawBody)
570 if err != nil {
571 decodedBody = rawBody
572 }
573
574 // HTML bodies skip the markdown pre-pass — md4c can mangle attribute-heavy
575 // or indented HTML (#602-style raw-tag bleed-through). Empty mimeType keeps
576 // legacy behavior for cached/legacy callers that don't supply one.
577 directHTML := mimeType == BodyMIMETypeHTML
578 var htmlBody []byte
579 if directHTML {
580 htmlBody = []byte(decodedBody)
581 } else {
582 htmlBody = markdownToHTML([]byte(decodedBody))
583 }
584
585 result, placements, err := renderHTMLToText(htmlBody, inline, h1Style, h2Style, disableImages)
586 if err != nil {
587 return "", nil, err
588 }
589
590 // Some real-world HTML emails (newsletters with table-only layouts and no
591 // <th>, AWeber-shape bodies) emit no visible content from htmlconv. Pre-
592 // c11de45, every body went through markdownToHTML first, which happened to
593 // keep these alive. Retry through the markdown pre-pass when the direct
594 // HTML path produces nothing.
595 if directHTML && strings.TrimSpace(result) == "" {
596 result, placements, err = renderHTMLToText(markdownToHTML([]byte(decodedBody)), inline, h1Style, h2Style, disableImages)
597 if err != nil {
598 return "", nil, err
599 }
600 }
601
602 result = styleQuotedReplies(result)
603 return bodyStyle.Render(result), placements, nil
604}
605
606func renderHTMLToText(htmlBody []byte, inline map[string]string, h1Style, h2Style lipgloss.Style, disableImages bool) (string, []ImagePlacement, error) {
607 // Parse HTML into structured elements using C parser.
608 elements, ok := clib.HTMLToElements(string(htmlBody))
609 if !ok {
610 return "", nil, fmt.Errorf("could not parse email body")
611 }
612
613 // Process elements: apply styles and collect image placements.
614 var text strings.Builder
615 var imgIndex int
616 var pendingImages []struct {
617 index int
618 payload string
619 rows int
620 }
621
622 onWroteRegex := regexp.MustCompile(`On\s+(.+?),\s+(.+?)\s+wrote:`)
623
624 for _, elem := range elements {
625 switch elem.Type {
626 case clib.HElemText:
627 text.WriteString(elem.Text)
628
629 case clib.HElemH1:
630 text.WriteString(h1Style.Render(elem.Text))
631 text.WriteString("\n\n")
632
633 case clib.HElemH2:
634 text.WriteString(h2Style.Render(elem.Text))
635 text.WriteString("\n\n")
636
637 case clib.HElemLink:
638 text.WriteString(hyperlink(elem.Attr1, elem.Text))
639
640 case clib.HElemImage:
641 src := elem.Attr1
642 alt := elem.Attr2
643
644 if !disableImages && imageProtocolSupported() {
645 var payload string
646 switch {
647 case strings.HasPrefix(src, "data:image/"):
648 payload = dataURIBase64(src)
649 case strings.HasPrefix(src, "cid:"):
650 cid := strings.TrimPrefix(src, "cid:")
651 cid = strings.Trim(cid, "<>")
652 if inline != nil {
653 payload = inline[cid]
654 debugImageProtocol("cid lookup for %s found=%t len=%d", cid, payload != "", len(payload))
655 } else {
656 debugImageProtocol("cid lookup skipped inline map nil for %s", cid)
657 }
658 case strings.HasPrefix(src, "http://") || strings.HasPrefix(src, "https://"):
659 payload = fetchRemoteBase64(src)
660 }
661
662 if payload != "" {
663 rows := imageRows(payload)
664 debugImageProtocol("collected image placement src=%s rows=%d", src, rows)
665
666 idx := imgIndex
667 imgIndex++
668 pendingImages = append(pendingImages, struct {
669 index int
670 payload string
671 rows int
672 }{idx, payload, rows})
673
674 fmt.Fprintf(&text, "\n[[MATCHA_IMG:%d]]", idx)
675 fmt.Fprintf(&text, "\n%s%d%s\n", imageRowPlaceholderPrefix, rows, imageRowPlaceholderSuffix)
676 continue
677 }
678 debugImageProtocol("no payload for src=%s", src)
679 }
680 if hyperlinkSupported() {
681 fmt.Fprintf(&text, "\n %s \n", hyperlink(src, fmt.Sprintf("[Click here to view image: %s]", alt)))
682 } else {
683 fmt.Fprintf(&text, "\n %s \n", linkStyle().Render(fmt.Sprintf("[Image: %s, %s]", alt, src)))
684 }
685
686 case clib.HElemTable:
687 headerRows := 0
688 if elem.Attr1 != "" {
689 fmt.Sscanf(elem.Attr1, "%d", &headerRows) //nolint:errcheck,gosec
690 }
691 text.WriteString("\n")
692 text.WriteString(renderTable(elem.Text, headerRows))
693 text.WriteString("\n")
694
695 case clib.HElemBlockquote:
696 var from, date string
697 prevText := elem.Attr2
698 cite := elem.Attr1
699
700 if matches := onWroteRegex.FindStringSubmatch(prevText); matches != nil {
701 date = parseDateForDisplay(matches[1])
702 from = matches[2]
703 } else if matches := onWroteRegex.FindStringSubmatch(cite); matches != nil {
704 date = parseDateForDisplay(matches[1])
705 from = matches[2]
706 }
707
708 text.WriteString(renderQuoteBox(from, date, strings.Split(elem.Text, "\n")))
709 }
710 }
711
712 result := text.String()
713
714 // Collapse excessive newlines, but not the image row placeholders
715 re := regexp.MustCompile(`\n{3,}`)
716 result = re.ReplaceAllString(result, "\n\n")
717
718 // Now expand the image row placeholders to actual newlines
719 result = expandImageRowPlaceholders(result)
720
721 // Build image placements by finding the line numbers of image markers.
722 var placements []ImagePlacement
723 if len(pendingImages) > 0 {
724 lines := strings.Split(result, "\n")
725 imgMarkerRegex := regexp.MustCompile(`\[\[MATCHA_IMG:(\d+)\]\]`)
726 for lineNum, line := range lines {
727 if matches := imgMarkerRegex.FindStringSubmatch(line); matches != nil {
728 var idx int
729 fmt.Sscanf(matches[1], "%d", &idx) //nolint:errcheck,gosec
730 for _, pi := range pendingImages {
731 if pi.index == idx {
732 placements = append(placements, ImagePlacement{
733 Line: lineNum,
734 Base64: pi.payload,
735 Rows: pi.rows,
736 })
737 break
738 }
739 }
740 }
741 }
742
743 // Remove the image markers from the text (leave the spacing)
744 result = imgMarkerRegex.ReplaceAllString(result, "")
745 }
746
747 return result, placements, nil
748}
749
750func tableHeaderStyle() lipgloss.Style {
751 return lipgloss.NewStyle().Bold(true).Foreground(theme.ActiveTheme.Accent)
752}
753
754func tableBorderStyle() lipgloss.Style {
755 return lipgloss.NewStyle().Foreground(theme.ActiveTheme.Secondary)
756}
757
758// renderTable renders table data as a Unicode box-drawing table.
759// data is tab-separated cells, newline-separated rows.
760// headerRows is the number of header rows.
761func renderTable(data string, headerRows int) string {
762 rows := strings.Split(data, "\n")
763 if len(rows) == 0 {
764 return ""
765 }
766
767 // Parse into 2D grid and trim cell whitespace
768 var grid [][]string
769 maxCols := 0
770 for _, row := range rows {
771 cells := strings.Split(row, "\t")
772 trimmed := make([]string, len(cells))
773 for i, c := range cells {
774 trimmed[i] = strings.TrimSpace(c)
775 }
776 grid = append(grid, trimmed)
777 if len(trimmed) > maxCols {
778 maxCols = len(trimmed)
779 }
780 }
781
782 // Normalize: ensure all rows have the same number of columns
783 for i := range grid {
784 for len(grid[i]) < maxCols {
785 grid[i] = append(grid[i], "")
786 }
787 }
788
789 // Calculate column widths
790 colWidths := make([]int, maxCols)
791 for _, row := range grid {
792 for j, cell := range row {
793 if len(cell) > colWidths[j] {
794 colWidths[j] = len(cell)
795 }
796 }
797 }
798
799 // Minimum width per column
800 for i := range colWidths {
801 if colWidths[i] < 3 {
802 colWidths[i] = 3
803 }
804 }
805
806 bs := tableBorderStyle()
807 hs := tableHeaderStyle()
808
809 // Build horizontal borders
810 buildBorder := func(left, mid, right, fill string) string {
811 var b strings.Builder
812 b.WriteString(bs.Render(left))
813 for j, w := range colWidths {
814 b.WriteString(bs.Render(strings.Repeat(fill, w+2)))
815 if j < len(colWidths)-1 {
816 b.WriteString(bs.Render(mid))
817 }
818 }
819 b.WriteString(bs.Render(right))
820 return b.String()
821 }
822
823 topBorder := buildBorder("┌", "┬", "┐", "─")
824 midBorder := buildBorder("├", "┼", "┤", "─")
825 botBorder := buildBorder("└", "┴", "┘", "─")
826
827 var out strings.Builder
828 out.WriteString(topBorder)
829 out.WriteString("\n")
830
831 for i, row := range grid {
832 out.WriteString(bs.Render("│"))
833 for j, cell := range row {
834 padded := cell + strings.Repeat(" ", colWidths[j]-len(cell))
835 if i < headerRows {
836 out.WriteString(" " + hs.Render(padded) + " ")
837 } else {
838 out.WriteString(" " + padded + " ")
839 }
840 out.WriteString(bs.Render("│"))
841 }
842 out.WriteString("\n")
843
844 if i < headerRows && (i+1 == headerRows || i+1 == len(grid)) {
845 out.WriteString(midBorder)
846 out.WriteString("\n")
847 }
848 }
849
850 out.WriteString(botBorder)
851 return out.String()
852}
853
854func quoteBoxStyle() lipgloss.Style {
855 return lipgloss.NewStyle().
856 Border(lipgloss.RoundedBorder()).
857 BorderForeground(theme.ActiveTheme.Secondary).
858 Padding(0, 1).
859 Foreground(theme.ActiveTheme.Secondary)
860}
861
862func quoteHeaderStyle() lipgloss.Style {
863 return lipgloss.NewStyle().
864 Foreground(theme.ActiveTheme.Secondary)
865}
866
867// styleQuotedReplies detects quoted reply sections and styles them in a box
868func styleQuotedReplies(text string) string {
869 lines := strings.Split(text, "\n")
870 var result []string
871 var quoteBlock []string
872 var quoteFrom, quoteDate string
873 inQuote := false
874
875 // Regex to match "On DATE, EMAIL wrote:" pattern
876 // Matches various date formats
877 onWroteRegex := regexp.MustCompile(`^On\s+(.+?),\s+(.+?)\s+wrote:$`)
878
879 for i := 0; i < len(lines); i++ {
880 line := lines[i]
881 trimmedLine := strings.TrimSpace(line)
882
883 // Check for "On DATE, EMAIL wrote:" header
884 if matches := onWroteRegex.FindStringSubmatch(trimmedLine); matches != nil {
885 // If we were already in a quote block, render it first
886 if inQuote && len(quoteBlock) > 0 {
887 result = append(result, renderQuoteBox(quoteFrom, quoteDate, quoteBlock))
888 quoteBlock = nil
889 }
890
891 // Parse the date and email from the match
892 dateStr := matches[1]
893 quoteFrom = matches[2]
894 quoteDate = parseDateForDisplay(dateStr)
895 inQuote = true
896 continue
897 }
898
899 // Check if line starts with ">" (quoted text)
900 if strings.HasPrefix(trimmedLine, ">") { //nolint:gocritic
901 if !inQuote {
902 // Start a new quote block without header info
903 inQuote = true
904 quoteFrom = ""
905 quoteDate = ""
906 }
907 // Remove the leading "> " and add to quote block
908 quotedContent := strings.TrimPrefix(trimmedLine, ">")
909 quotedContent = strings.TrimPrefix(quotedContent, " ")
910 quoteBlock = append(quoteBlock, quotedContent)
911 } else if inQuote {
912 // End of quote block - check if it's just whitespace
913 if trimmedLine == "" && i+1 < len(lines) && strings.HasPrefix(strings.TrimSpace(lines[i+1]), ">") { //nolint:gocritic
914 // Empty line within quote block, keep it
915 quoteBlock = append(quoteBlock, "")
916 } else if trimmedLine == "" && len(quoteBlock) == 0 {
917 // Empty line before any quoted content, skip
918 continue
919 } else {
920 // End of quote block
921 if len(quoteBlock) > 0 {
922 result = append(result, renderQuoteBox(quoteFrom, quoteDate, quoteBlock))
923 quoteBlock = nil
924 }
925 inQuote = false
926 quoteFrom = ""
927 quoteDate = ""
928 result = append(result, line)
929 }
930 } else {
931 result = append(result, line)
932 }
933 }
934
935 // Handle any remaining quote block
936 if inQuote && len(quoteBlock) > 0 {
937 result = append(result, renderQuoteBox(quoteFrom, quoteDate, quoteBlock))
938 }
939
940 return strings.Join(result, "\n")
941}
942
943// parseDateForDisplay converts various date formats to DD:MM:YY HH:MM
944func parseDateForDisplay(dateStr string) string {
945 // Common date formats to try
946 formats := []string{
947 "Jan 2, 2006 at 3:04 PM",
948 "02:01:06 15:04",
949 "2006-01-02 15:04:05",
950 "Mon, 02 Jan 2006 15:04:05 -0700",
951 "Mon, 2 Jan 2006 15:04:05 -0700",
952 "2 Jan 2006 15:04:05",
953 "January 2, 2006 at 3:04 PM",
954 "Jan 2, 2006 3:04 PM",
955 time.RFC1123Z,
956 time.RFC1123,
957 time.RFC822Z,
958 time.RFC822,
959 }
960
961 for _, format := range formats {
962 if t, err := time.Parse(format, dateStr); err == nil {
963 return t.Format("02:01:06 15:04")
964 }
965 }
966
967 // Return original if parsing fails
968 return dateStr
969}
970
971// renderQuoteBox renders a quoted section in a styled box
972func renderQuoteBox(from, date string, lines []string) string {
973 // Build header with email on left and date on right
974 var header string
975 if from != "" || date != "" {
976 switch {
977 case from != "" && date != "":
978 header = quoteHeaderStyle().Render(from + " " + date)
979 case from != "":
980 header = quoteHeaderStyle().Render(from)
981 default:
982 header = quoteHeaderStyle().Render(date)
983 }
984 }
985
986 // Join the quoted content
987 content := strings.Join(lines, "\n")
988
989 // Build the box content
990 var boxContent string
991 if header != "" {
992 boxContent = header + "\n\n" + content
993 } else {
994 boxContent = content
995 }
996
997 return quoteBoxStyle().Render(boxContent)
998}