mermaid-mod

1import type { Register } from 'claude-code'
2import { ROLE_STYLE, WARNING_COLOR } from '../src/theme.ts'
3import { type Display, type Mode, type Segment, transform } from '../src/transform.ts'
4
5const MODES: readonly Mode[] = ['off', 'final', 'streaming']
6const DISPLAYS: readonly Display[] = ['both', 'diagram']
7const BULLET = '⏺'
8// Measured: reply text sits behind a 2-column gutter ("⏺ "); one more column keeps the art off the edge.
9const GUTTER = 3
10const CACHE_LIMIT = 64
11
12let mode: Mode = 'streaming'
13let display: Display = 'both'
14const cache = new Map<string, Segment[] | null>()
15
16function cached(text: string, width: number | undefined): Segment[] | null {
17  const key = `${mode}\0${display}\0${width}\0${text}`
18  if (cache.has(key)) return cache.get(key)!
19  const segments = transform(text, { mode, width, display })
20  if (cache.size >= CACHE_LIMIT) cache.delete(cache.keys().next().value!)
21  cache.set(key, segments)
22  return segments
23}
24
25const isMode = (value: unknown): value is Mode => MODES.includes(value as Mode)
26const isDisplay = (value: unknown): value is Display => DISPLAYS.includes(value as Display)
27const status = () => ({ text: `mermaid: ${mode}, ${display}` })
28
29export const register: Register = on => {
30  on('session.start', async ($, e, next) => {
31    const result = await next(e)
32    const saved = await $.store.get('mode').catch(() => undefined)
33    if (isMode(saved)) mode = saved
34    const savedDisplay = await $.store.get('display').catch(() => undefined)
35    if (isDisplay(savedDisplay)) display = savedDisplay
36    await $.command
37      .register({ name: 'mermaid', description: 'Draw ```mermaid blocks as diagrams: off, final or streaming; both or diagram', argumentHint: '[off|final|streaming|both|diagram]', immediate: true })
38      .catch(err => $.ui.log(`mermaid-mod: /mermaid not registered: ${err}`))
39    return result
40  })
41
42  on('command.run', { command: 'mermaid' }, async ($, e) => {
43    const arg = e.args.trim().toLowerCase()
44    if (isMode(arg)) {
45      mode = arg
46      await $.store.set('mode', mode)
47    } else if (isDisplay(arg)) {
48      display = arg
49      await $.store.set('display', display)
50    } else if (arg) {
51      return { text: `mermaid: unknown setting "${arg}"; use off, final, streaming, both or diagram` }
52    }
53    if (arg) $.ui.invalidate('ui.render')
54    return status()
55  })
56
57  on('ui.render', { component: 'AssistantMessage' }, ($, e, next) => {
58    const width = e.viewport ? e.viewport.columns - GUTTER : undefined
59    const segments = cached(e.props.text, width)
60    if (!segments) return next(e)
61    const { Box, Text, Markdown } = $.ui.resolve(e)
62    const body = segments.map(segment => {
63      if (segment.kind === 'markdown') return Markdown({ text: segment.text })
64      if (segment.kind === 'warning') return Text({ color: WARNING_COLOR, children: segment.text })
65      return Box({
66        flexDirection: 'column',
67        children: segment.rows.map(row =>
68          Text({ children: row.length ? row.map(span => (ROLE_STYLE[span.role].color ? Text({ ...ROLE_STYLE[span.role], children: span.text }) : span.text)) : ' ' }),
69        ),
70      })
71    })
72    return Box({
73      flexDirection: 'row',
74      children: [
75        Text({ children: e.props.isFirstOfReply ? `${BULLET} ` : '  ' }),
76        Box({ flexDirection: 'column', flexGrow: 1, gap: 1, children: body }),
77      ],
78    })
79  })
80}
81

1import type { ThemeKey } from 'claude-code'
2import type { Role } from '../hooks/vendor/lovely-mermaid.js'
3
4export const ROLE_STYLE: Record<Role, { color?: ThemeKey; bold?: true }> = {
5  border: { color: 'subtle' },
6  text: { color: 'text' },
7  edge: { color: 'suggestion' },
8  edgeLabel: { color: 'inactive' },
9  title: { color: 'suggestion', bold: true },
10  none: {},
11}
12
13export const WARNING_COLOR: ThemeKey = 'warning'
14

1import { render, type Span } from '../hooks/vendor/lovely-mermaid.js'
2import { normalize } from './normalize.ts'
3
4export type Mode = 'off' | 'final' | 'streaming'
5export type Display = 'both' | 'diagram'
6export type Segment =
7  | { kind: 'markdown'; text: string }
8  | { kind: 'diagram'; rows: Span[][] }
9  | { kind: 'warning'; text: string }
10
11type Fence = { char: string; length: number; indent: number; isMermaid: boolean; start: number }
12
13const OPENING = /^( {0,3})(`{3,}|~{3,})(.*)$/
14const CLOSING = /^ {0,3}(`{3,}|~{3,})[ \t\r]*$/
15
16function openingOf(line: string, start: number): Fence | null {
17  const m = OPENING.exec(line)
18  if (!m) return null
19  const [, indent = '', run = '', info = ''] = m
20  const char = run.charAt(0)
21  if (char === '`' && info.includes('`')) return null
22  const lang = info.trim().split(/\s+/, 1)[0]?.toLowerCase()
23  return { char, length: run.length, indent: indent.length, isMermaid: lang === 'mermaid', start }
24}
25
26function closes(fence: Fence, line: string): boolean {
27  const run = CLOSING.exec(line)?.[1] ?? ''
28  return run.charAt(0) === fence.char && run.length >= fence.length
29}
30
31// shortcut: a fence indented 1-3 spaces inside a list item counts as top level; parse list context if that misfires.
32export function transform(markdown: string, ctx: { mode: Mode; width: number | undefined; display: Display }): Segment[] | null {
33  if (ctx.mode === 'off') return null
34  const lines = markdown.split('\n')
35  const segments: Segment[] = []
36  let prose: string[] = []
37  let drewSomething = false
38
39  const flush = () => {
40    const text = prose.join('\n')
41    if (text.trim()) segments.push({ kind: 'markdown', text })
42    prose = []
43  }
44
45  const settle = (fence: Fence, end: number, closed: boolean) => {
46    const raw = lines.slice(fence.start, closed ? end + 1 : end)
47    const art =
48      ctx.width === undefined || (!closed && ctx.mode === 'final')
49        ? null
50        : render(normalize(lines.slice(fence.start + 1, end).map(l => l.replace(new RegExp(`^ {0,${fence.indent}}`), '')).join('\n')))
51    if (!art || art.width > ctx.width!) {
52      prose.push(...raw)
53      return
54    }
55    if (closed && art.warnings.length > 0) {
56      prose.push(...raw)
57      flush()
58      const more = art.warnings.length > 1 ? ` (+${art.warnings.length - 1} more)` : ''
59      segments.push({ kind: 'warning', text: `Mermaid diagram not rendered: ${art.warnings[0]}${more}` })
60    } else {
61      flush()
62      segments.push({ kind: 'diagram', rows: art.styled })
63      if (ctx.display === 'both') prose.push(...raw)
64    }
65    drewSomething = true
66  }
67
68  let fence: Fence | null = null
69  for (const [i, line] of lines.entries()) {
70    if (!fence) {
71      fence = openingOf(line, i)
72      if (!fence?.isMermaid) prose.push(line)
73      continue
74    }
75    if (closes(fence, line)) {
76      if (fence.isMermaid) settle(fence, i, true)
77      else prose.push(line)
78      fence = null
79    } else if (!fence.isMermaid) prose.push(line)
80  }
81  if (fence?.isMermaid) settle(fence, lines.length, false)
82  flush()
83  return drewSomething ? segments : null
84}
85

1// Generated by scripts/vendor.mjs from lovely-mermaid 0.3.3 (Apache-2.0, see LICENSE-lovely-mermaid). Do not edit.
2
3// node_modules/lovely-mermaid/dist/width-data.js
4var WIDTHS = [
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427  [10071, 10071, 2],
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429  [10133, 10135, 2],
430  [10136, 10159, 1],
431  [10160, 10160, 2],
432  [10161, 10174, 1],
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436  [11037, 11087, 1],
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438  [11089, 11092, 1],
439  [11093, 11093, 2],
440  [11094, 11502, 1],
441  [11503, 11505, 0],
442  [11506, 11743, 1],
443  [11744, 11775, 0],
444  [11776, 11903, 1],
445  [11904, 11929, 2],
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456  [12439, 12440, 1],
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460  [12549, 12591, 2],
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465  [12687, 12687, 1],
466  [12688, 12771, 2],
467  [12772, 12782, 1],
468  [12783, 12830, 2],
469  [12831, 12831, 1],
470  [12832, 12871, 2],
471  [12872, 12879, 1],
472  [12880, 19903, 2],
473  [19904, 19967, 1],
474  [19968, 42124, 2],
475  [42125, 42127, 1],
476  [42128, 42182, 2],
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479  [42611, 42611, 1],
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481  [42622, 42653, 1],
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483  [42656, 42735, 1],
484  [42736, 42737, 0],
485  [42738, 43009, 1],
486  [43010, 43010, 0],
487  [43011, 43013, 1],
488  [43014, 43014, 0],
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490  [43019, 43019, 0],
491  [43020, 43044, 1],
492  [43045, 43046, 0],
493  [43047, 43051, 1],
494  [43052, 43052, 0],
495  [43053, 43203, 1],
496  [43204, 43205, 0],
497  [43206, 43231, 1],
498  [43232, 43249, 0],
499  [43250, 43257, 1],
500  [43258, 43258, 0],
501  [43259, 43262, 1],
502  [43263, 43263, 0],
503  [43264, 43301, 1],
504  [43302, 43309, 0],
505  [43310, 43334, 1],
506  [43335, 43345, 0],
507  [43346, 43359, 1],
508  [43360, 43388, 2],
509  [43389, 43391, 1],
510  [43392, 43394, 0],
511  [43395, 43442, 1],
512  [43443, 43443, 0],
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514  [43446, 43449, 0],
515  [43450, 43451, 1],
516  [43452, 43453, 0],
517  [43454, 43492, 1],
518  [43493, 43493, 0],
519  [43494, 43560, 1],
520  [43561, 43566, 0],
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524  [43573, 43574, 0],
525  [43575, 43586, 1],
526  [43587, 43587, 0],
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529  [43597, 43643, 1],
530  [43644, 43644, 0],
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551  [44014, 44031, 1],
552  [44032, 55203, 2],
553  [55204, 55215, 1],
554  [55216, 55238, 0],
555  [55239, 55242, 1],
556  [55243, 55291, 0],
557  [55292, 63743, 1],
558  [63744, 64255, 2],
559  [64256, 64285, 1],
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563  [65040, 65049, 2],
564  [65050, 65055, 1],
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573  [65280, 65280, 1],
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576  [65438, 65440, 0],
577  [65441, 65503, 1],
578  [65504, 65510, 2],
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580  [65520, 65528, 0],
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585  [66273, 66421, 1],
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588  [68097, 68099, 0],
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620  [69811, 69814, 0],
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622  [69817, 69818, 0],
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625  [69827, 69887, 1],
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627  [69891, 69926, 1],
628  [69927, 69931, 0],
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630  [69933, 69940, 0],
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635  [70018, 70069, 1],
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645  [70194, 70195, 1],
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649  [70200, 70205, 1],
650  [70206, 70206, 0],
651  [70207, 70208, 1],
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653  [70210, 70366, 1],
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655  [70368, 70370, 1],
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657  [70379, 70399, 1],
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661  [70461, 70461, 1],
662  [70462, 70462, 0],
663  [70463, 70463, 1],
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665  [70465, 70486, 1],
666  [70487, 70487, 0],
667  [70488, 70501, 1],
668  [70502, 70508, 0],
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670  [70512, 70516, 0],
671  [70517, 70711, 1],
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673  [70720, 70721, 1],
674  [70722, 70724, 0],
675  [70725, 70725, 1],
676  [70726, 70726, 0],
677  [70727, 70749, 1],
678  [70750, 70750, 0],
679  [70751, 70831, 1],
680  [70832, 70832, 0],
681  [70833, 70834, 1],
682  [70835, 70840, 0],
683  [70841, 70841, 1],
684  [70842, 70842, 0],
685  [70843, 70844, 1],
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687  [70846, 70846, 1],
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690  [70850, 70851, 0],
691  [70852, 71086, 1],
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693  [71088, 71089, 1],
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695  [71094, 71099, 1],
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697  [71102, 71102, 1],
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700  [71132, 71133, 0],
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761  [72766, 72766, 1],
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810  [94181, 94191, 1],
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812  [94194, 94207, 1],
813  [94208, 100343, 2],
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817  [101632, 101640, 2],
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820  [110580, 110580, 1],
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838  [113823, 113823, 1],
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840  [113828, 118527, 1],
841  [118528, 118573, 0],
842  [118574, 118575, 1],
843  [118576, 118598, 0],
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846  [119142, 119142, 1],
847  [119143, 119145, 0],
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850  [119171, 119172, 1],
851  [119173, 119179, 0],
852  [119180, 119209, 1],
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862  [121462, 121475, 1],
863  [121476, 121476, 0],
864  [121477, 121498, 1],
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866  [121504, 121504, 1],
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870  [122887, 122887, 1],
871  [122888, 122904, 0],
872  [122905, 122906, 1],
873  [122907, 122913, 0],
874  [122914, 122914, 1],
875  [122915, 122916, 0],
876  [122917, 122917, 1],
877  [122918, 122922, 0],
878  [122923, 123022, 1],
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880  [123024, 123183, 1],
881  [123184, 123190, 0],
882  [123191, 123565, 1],
883  [123566, 123566, 0],
884  [123567, 123627, 1],
885  [123628, 123631, 0],
886  [123632, 124139, 1],
887  [124140, 124143, 0],
888  [124144, 125135, 1],
889  [125136, 125142, 0],
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891  [125252, 125258, 0],
892  [125259, 126979, 1],
893  [126980, 126980, 2],
894  [126981, 127182, 1],
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896  [127184, 127373, 1],
897  [127374, 127374, 2],
898  [127375, 127376, 1],
899  [127377, 127386, 2],
900  [127387, 127487, 1],
901  [127488, 127490, 2],
902  [127491, 127503, 1],
903  [127504, 127547, 2],
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906  [127561, 127567, 1],
907  [127568, 127569, 2],
908  [127570, 127583, 1],
909  [127584, 127589, 2],
910  [127590, 127743, 1],
911  [127744, 127776, 2],
912  [127777, 127788, 1],
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914  [127798, 127798, 1],
915  [127799, 127868, 2],
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918  [127892, 127903, 1],
919  [127904, 127946, 2],
920  [127947, 127950, 1],
921  [127951, 127955, 2],
922  [127956, 127967, 1],
923  [127968, 127984, 2],
924  [127985, 127987, 1],
925  [127988, 127988, 2],
926  [127989, 127991, 1],
927  [127992, 128062, 2],
928  [128063, 128063, 1],
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930  [128065, 128065, 1],
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932  [128253, 128254, 1],
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935  [128331, 128334, 2],
936  [128335, 128335, 1],
937  [128336, 128359, 2],
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940  [128379, 128404, 1],
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946  [128592, 128639, 1],
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950  [128717, 128719, 1],
951  [128720, 128722, 2],
952  [128723, 128724, 1],
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960  [128765, 128991, 1],
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963  [129008, 129008, 2],
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967  [129340, 129349, 2],
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969  [129351, 129535, 2],
970  [129536, 129647, 1],
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972  [129661, 129663, 1],
973  [129664, 129672, 2],
974  [129673, 129679, 1],
975  [129680, 129725, 2],
976  [129726, 129726, 1],
977  [129727, 129733, 2],
978  [129734, 129741, 1],
979  [129742, 129755, 2],
980  [129756, 129759, 1],
981  [129760, 129768, 2],
982  [129769, 129775, 1],
983  [129776, 129784, 2],
984  [129785, 131071, 1],
985  [131072, 196605, 2],
986  [196606, 196607, 1],
987  [196608, 262141, 2],
988  [262142, 917503, 1],
989  [917504, 921599, 0],
990  [921600, 1114111, 1]
991];
992
993// node_modules/lovely-mermaid/dist/width.js
994var segmenter = new Intl.Segmenter("en", { granularity: "grapheme" });
995var VS16 = 65039;
996var isRegionalIndicator = (cp) => cp >= 127462 && cp <= 127487;
997function codePointWidth(cp) {
998  let lo = 0;
999  let hi = WIDTHS.length - 1;
1000  while (lo <= hi) {
1001    const mid = lo + hi >> 1;
1002    const run = WIDTHS[mid];
1003    if (cp < run[0])
1004      hi = mid - 1;
1005    else if (cp > run[1])
1006      lo = mid + 1;
1007    else
1008      return run[2];
1009  }
1010  return 1;
1011}
1012function clusterWidth(cluster) {
1013  let w = 0;
1014  let vs16 = false;
1015  let regional = 0;
1016  for (const ch of cluster) {
1017    const cp = ch.codePointAt(0);
1018    if (cp === VS16)
1019      vs16 = true;
1020    if (isRegionalIndicator(cp))
1021      regional++;
1022    const cw = codePointWidth(cp);
1023    if (cw > w)
1024      w = cw;
1025  }
1026  return vs16 || regional >= 2 ? 2 : w;
1027}
1028function* measured(s) {
1029  for (const { segment } of segmenter.segment(s))
1030    yield [segment, clusterWidth(segment)];
1031}
1032function stringWidth(s) {
1033  let w = 0;
1034  for (const { segment } of segmenter.segment(s))
1035    w += clusterWidth(segment);
1036  return w;
1037}
1038
1039// node_modules/lovely-mermaid/dist/labels.js
1040var WRAP_WIDTH = 24;
1041var MAX_LINES = 4;
1042var MAX_LABEL = 28;
1043var LABEL_BREAK_CHARS = ["_", "-", ".", "/"];
1044var asciiLower = (s) => s.replace(/[A-Z]/g, (c) => c.toLowerCase());
1045var asciiUpper = (s) => s.replace(/[a-z]/g, (c) => c.toUpperCase());
1046var CONTROLS = /[\0-\x08\x0b\x0c\x0e-\x1f\x7f-\x9f]/g;
1047var stripControls = (src) => src.replace(CONTROLS, "");
1048function srcLines(src) {
1049  const out = src.split("\n").map((l) => l.endsWith("\r") ? l.slice(0, -1) : l);
1050  if (out.length > 0 && out[out.length - 1] === "")
1051    out.pop();
1052  return out;
1053}
1054var ALNUM = /[\p{Alphabetic}\p{N}]/u;
1055var isAlphanumeric = (c) => ALNUM.test(c);
1056var isIdChar = (c) => isAlphanumeric(c) || c === "_";
1057var ENTITY_LOOKAHEAD = 10;
1058var NAMED_ENTITIES = {
1059  lt: "<",
1060  gt: ">",
1061  amp: "&",
1062  quot: '"',
1063  apos: "'"
1064};
1065function decodeEntityBody(body) {
1066  const named = NAMED_ENTITIES[body];
1067  if (named !== void 0)
1068    return named;
1069  if (!body.startsWith("#"))
1070    return null;
1071  const num = body.slice(1);
1072  const hex = /^[xX]/.test(num);
1073  const digits = hex ? num.slice(1) : num;
1074  if (!(hex ? /^[0-9a-fA-F]+$/ : /^[0-9]+$/).test(digits))
1075    return null;
1076  const code = Number.parseInt(digits, hex ? 16 : 10);
1077  if (code > 1114111 || code >= 55296 && code <= 57343)
1078    return null;
1079  if (code < 32 || code >= 127 && code <= 159)
1080    return null;
1081  return String.fromCodePoint(code);
1082}
1083function decodeHtmlEntities(s) {
1084  if (!s.includes("&"))
1085    return s;
1086  const chars = [...s];
1087  let out = "";
1088  let i = 0;
1089  while (i < chars.length) {
1090    if (chars[i] !== "&") {
1091      out += chars[i];
1092      i++;
1093      continue;
1094    }
1095    const hi = Math.min(i + 1 + ENTITY_LOOKAHEAD, chars.length);
1096    let semi = -1;
1097    for (let j = i + 1; j < hi; j++) {
1098      if (chars[j] === ";") {
1099        semi = j;
1100        break;
1101      }
1102    }
1103    const decoded = semi === -1 ? null : decodeEntityBody(chars.slice(i + 1, semi).join(""));
1104    if (decoded === null) {
1105      out += "&";
1106      i++;
1107    } else {
1108      out += decoded;
1109      i = semi + 1;
1110    }
1111  }
1112  return out;
1113}
1114function stripMarkdown(s) {
1115  const noCode = [...s].filter((c) => c !== "`").join("");
1116  const noStrong = noCode.replaceAll("**", "").replaceAll("__", "");
1117  const chars = [...noStrong];
1118  let out = "";
1119  for (let i = 0; i < chars.length; i++) {
1120    const c = chars[i];
1121    const inWord = i > 0 && isAlphanumeric(chars[i - 1]) && chars[i + 1] !== void 0 && isAlphanumeric(chars[i + 1]);
1122    if ((c === "*" || c === "_") && !inWord)
1123      continue;
1124    out += c;
1125  }
1126  return out.trim();
1127}
1128var HTML_FORMAT_TAGS = /* @__PURE__ */ new Set([
1129  "b",
1130  "strong",
1131  "i",
1132  "em",
1133  "u",
1134  "s",
1135  "strike",
1136  "del",
1137  "ins",
1138  "mark",
1139  "small",
1140  "big",
1141  "sub",
1142  "sup",
1143  "code",
1144  "kbd",
1145  "samp",
1146  "var",
1147  "tt",
1148  "span",
1149  "font",
1150  "q",
1151  "abbr",
1152  "cite",
1153  "pre"
1154]);
1155function htmlTagAt(chars, start) {
1156  let i = start + 1;
1157  if (chars[i] === "/")
1158    i++;
1159  const nameStart = i;
1160  while (i < chars.length && /^[0-9A-Za-z]$/.test(chars[i]))
1161    i++;
1162  if (i === nameStart)
1163    return null;
1164  const name = chars.slice(nameStart, i).join("");
1165  while (i < chars.length && chars[i] !== ">") {
1166    if (chars[i] === "<")
1167      return null;
1168    i++;
1169  }
1170  return chars[i] === ">" ? { name, end: i + 1 } : null;
1171}
1172function stripHtmlTags(s) {
1173  const chars = [...s];
1174  let out = "";
1175  let i = 0;
1176  while (i < chars.length) {
1177    if (chars[i] === "<") {
1178      const tag = htmlTagAt(chars, i);
1179      if (tag) {
1180        const lower = tag.name.toLowerCase();
1181        if (lower === "br") {
1182          out += " ";
1183          i = tag.end;
1184          continue;
1185        }
1186        if (HTML_FORMAT_TAGS.has(lower)) {
1187          i = tag.end;
1188          continue;
1189        }
1190      }
1191    }
1192    out += chars[i];
1193    i++;
1194  }
1195  return out;
1196}
1197function unwrap(s, open, close) {
1198  return s.length >= open.length + close.length && s.startsWith(open) && s.endsWith(close) ? s.slice(open.length, s.length - close.length) : null;
1199}
1200function cleanLabel(raw) {

1export function normalize(source: string): string {
2  return (
3    source
4      // `A --> |yes| B` loses B ("link has no target") though Mermaid accepts it; drop when lovely-mermaid fixes it upstream.
5      .replace(/([-=.]{2,}[>xo]?)[ \t]+(?=\|)/g, '$1')
6      // Mermaid's entity codes (`#quot;`, `#35;`) are drawn literally; drop when lovely-mermaid fixes it upstream.
7      .replace(/#quot;/g, '"')
8      .replace(/#(\d+);/g, (match, code: string) => (Number(code) <= 0x10ffff ? String.fromCodePoint(Number(code)) : match))
9  )
10}
11