Livret de lecture avec pastilles de sons

// ═══ Postext Cookbook · Nº 060 · Early reader with syllable chips ════════════════
// https://postext.dev/en/cookbook/reading-primer-syllables
// Code: MIT · Text: original (CC BY 4.0) · Pictures: diffusion models · Icons: drawn in code
// Fonts: Andika, DynaPuff, Playpen Sans (SIL OFL 1.1) · Needs postext ≥ 1.25.0
import {
  buildDocumentWithFonts, prepareFonts, renderPageToCanvas, registerResourceImage, setCellImage,
} from 'https://esm.sh/postext';

const LANG = 'en'; // @lang: the language of the sample document ('en' | 'es')
const RECIPE = 'reading-primer-syllables';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
const palette = { ink: '#242832', paper: '#ffffff', muted: '#5f6470', // text; instructions
  cream: '#f6f0e3', rule: '#d3c9b6', // the band, the tiles and the pictures' ground; guides
  // The vowel code: a syllable takes its vowel's colour. White on these fills measures
  // 3.2–4.9:1, above WCAG's 3:1 for large text: the vowel chips are bold, 20 pt or more.
  a: '#d9482b', e: '#dd740c', i: '#1f9a8f', o: '#3f6fd8', u: '#9152cf' };
// Every colour is linked to its palette entry by id.
const col = (id) => ({ hex: palette[id], model: 'hex', paletteId: id });
// The engine's defaults are linked to 'main-color': point it at the ink.
const colorPalette = Object.entries({ ...palette, 'main-color': palette.ink })
  .map(([id, hex]) => ({ id, name: id, value: { hex, model: 'hex' } }));
const [TEXT, DISPLAY, LABEL] = ['Andika', 'DynaPuff', 'Playpen Sans']; // Andika: one-storey a
const [TOP, SIDE, GRID] = [18, 20, 15]; // mm, mm, pt: every activity starts on the 15 pt grid

// #region answer: one chip style per vowel, and {ma·má} in the text written out as chips
// A word's syllables are chips with nothing between them, so their boxes touch and the white
// border draws the seam. Across a word space a chip keeps at least `gap`: 0.5 em sets the
// words of a 24 pt row 4.2 mm apart, where the space alone leaves 2.3 mm. Inside a sentence
// the '-frase' twins keep no gap, so the word space alone parts a chip from the word before.
// A 24 pt chip, padding and border included, is 10.4 mm tall (gotcha: chip-overlap).
const syllable = { fontFamily: TEXT, bold: true, borderWidth: pt(1), borderColor: col('paper'),
  paddingX: em(0.26), paddingY: em(0.05), gap: em(0.5) };
const chipStyles = [
  ...'aeiou'.split('').flatMap((v) => [ // one pair per vowel
    { ...syllable, id: v, background: col(v), color: col('paper') }, // a syllable with m
    { ...syllable, id: `${v}-borde`, background: col('paper'), color: col(v), borderColor: col(v) },
  ]).flatMap((style) => [style, { ...style, id: `${style.id}-frase`, gap: em(0) }]),
  { ...syllable, id: 'pinta', bold: false, background: col('paper'), color: col('ink'),
    borderColor: col('ink'), borderWidth: pt(0.8) }, // an outline for the child to colour in
];
const vowel = (s) => s.normalize('NFD').toLowerCase().match(/[aeiou]/)[0]; // 'mú' → 'u'
const chipOf = (s, v, end) => `:chip[${s}]{style="${v}${/m/i.test(s) ? '' : '-borde'}${end}"}`;
// {mi·mo·sa} → :chip[mi]{style="i"}:chip[mo]{style="o"}:chip[sa]{style="a-borde"}, and a word
// written after another word, as in 'me {mi·ma}.', takes the '-frase' twins. A piece with no
// vowel, the m and the p of the English {m·a·p}, takes the vowel of its word.
const syllables = (text) => text.replace(/(\p{L} )?\{([\p{L}·]+)\}/gu, (_, before = '', word) =>
  before + word.split('·').map((s) => chipOf(s, vowel(s + word), before && '-frase')).join(''));
// #endregion

const at = (x, y, size, edge = 'top-left') => ({ anchor: { to: 'page', edge },
  offset: { x: mm(x), y: mm(y) }, ...(size && { size }) });
const words = (id, content, family, size, weight, color, placement, extra) => ({ kind: 'text',
  id, content, fontFamily: family, fontSize: pt(size), fontWeight: weight, color: col(color),
  align: 'left', overflow: 'wrap', placement, ...extra });
const picture = (id, resourceId, placement) => ({ kind: 'image', id, resourceId, placement });
const tag = { textTransform: 'uppercase', letterSpacing: pt(1.5) };

// #region opener: the letter's page: a cream band, a giant Mm and two things that start with m
const THINGS = t({ en: ['monkey', 'moon'], es: ['mariposa', 'manzana'] }); // ids and labels
const BAND = 104; // mm: the depth of the band's drawing; its wave dips to 101.9 mm
// The opener reserves seventeen grid lines, the first grid line past the foot of the band's
// image, so the first activity title stands on the grid like the others: two lines under
// the band, its instruction right under it.
const opener = { enabled: true, minHeight: pt(17 * GRID),
  slot: { elements: [
    picture('band', 'banda', at(0, 0, { width: mm(210), height: mm(BAND) })),
    words('unit', '{attr.unit}', LABEL, 9, 700, 'paper', at(SIDE, 12.5), { ...tag,
      box: { backgroundColor: col('ink'), borderRadius: mm(3),
        padding: { top: mm(1.2), right: mm(2.8), bottom: mm(1.2), left: mm(2.8) } } }),
    words('kicker', '{attr.kicker}', LABEL, 8.5, 600, 'muted', // level with the pill's text
      { anchor: { to: '#unit', edge: 'right-of' }, offset: { x: mm(4), y: mm(1.4) } }, tag),
    words('letter', '{titleText}', DISPLAY, 190, 700, 'ink', at(SIDE - 3, 19), { lineHeight: 1 }),
    words('name', '{attr.name}', LABEL, 20, 600, 'ink', at(SIDE + 1, 76)),
    picture('first', THINGS[0], at(146, 12, { width: mm(40) })),
    picture('second', THINGS[1], at(151, 53, { width: mm(30) })),
    ...[45.5, 84.5].map((y, k) => words(THINGS[k], THINGS[k], LABEL, 10, 600, 'muted',
      at(146, y, { width: mm(40) }), { align: 'center' })), // its name under each picture
  ] } };
// #endregion

// #region activities: each activity heading draws its icon beside the title
const ICON = 9; // mm
const H2 = { level: 2, marginBottom: pt(0), // two grid lines per title, and two above it
  lineHeight: pt(2 * GRID), marginTop: pt(2 * GRID) };
const activity = (id, icon) => ({ id, advancedDesign: { enabled: true, slot: { elements: [
  picture('icon', icon, { anchor: { to: 'container', edge: 'top-left' },
    size: { width: mm(ICON), height: mm(ICON) } }),
  words('title', '{titleText}', LABEL, 15, 700, 'ink', { anchor: { to: '#icon',
    edge: 'right-of' }, offset: { x: mm(3) }, size: { width: mm(140), height: mm(ICON) } },
  { verticalAlign: 'middle' }), // centred on the icon
] } } });
// #endregion

// #region pictures: six picture words in a rounded grid, each picture inside its cell
const PICTURE_WORDS = t({ en: ['m·a·p', 'm·a·t', 'm·a·n', 'm·u·g', 'm·o·p', 'm·u·d'],
  es: ['ma·no', 'ma·pa', 'me·sa', 'mi·mo·sa', 'mo·no', 'mu·ñe·ca'] });
const tableStyles = [{ id: 'dibujos', borderRadius: mm(5), // the frame and its fills, rounded
  headerBackgroundEnabled: false, // a header row added later would print grey (#f0f0f0)
  bodyBackgroundEnabled: true, bodyBackground: col('cream'), // cream tiles…
  rules: 'grid', borderColor: col('paper'), borderWidth: pt(4), // …parted by white rules
  bodyFontSize: pt(20), cellPadding: mm(3) }]; // the words' chips are 20 pt
const cells = (row) => PICTURE_WORDS.slice(row * 3, row * 3 + 3)
  .map((word) => ({ content: syllables(`{${word}}`), align: 'center' }));
let grid = { columnWidths: [1, 1, 1], rows: [cells(0), cells(1)] };
PICTURE_WORDS.forEach((word, k) => { // the picture above the word, 0.72 of the cell's width
  const resourceId = word.replaceAll('·', '').replace('ñ', 'n');
  grid = setCellImage(grid, { row: Math.floor(k / 3), col: k % 3 }, { resourceId, width: 0.72 });
});
// #endregion

// The type of every picture and the table: its empty captionPrefix prints no caption line.
const sheet = { id: 'lamina', name: t({ en: 'Plate', es: 'Lámina' }), shortLabel: '',
  captionPrefix: '', numberingTemplate: '{n}', resetOn: 'never', counterFormat: 'decimal' };
const here = (id, rest) => ({ id, typeId: 'lamina', createdAt: 0, updatedAt: 0,
  placement: { position: 'here' }, ...rest });

const FOLIO = 9; // mm: the folio's disc
const folio = (parity, edge, x, textEdge, textX) => [
  words(`n-${parity}`, '{pageNumber}', DISPLAY, 12, 700, 'paper',
    at(x, -10, { width: mm(FOLIO), height: mm(FOLIO) }, edge),
    { align: 'center', verticalAlign: 'middle', parity,
      box: { backgroundColor: col('ink'), borderRadius: mm(FOLIO / 2) } }),
  words(`s-${parity}`, '{title} · {attr.unit}: {attr.name}', LABEL, 8, 600, 'muted',
    at(textX, -10, { width: mm(100), height: mm(FOLIO) }, textEdge),
    { parity, verticalAlign: 'middle', align: textEdge.endsWith('left') ? 'left' : 'right' }),
];

const config = () => ({
  colorPalette, chipStyles, tableStyles, resourceTypes: [sheet],
  page: { width: mm(210), height: mm(260), dpi: 150, margins: { top: mm(TOP), bottom: mm(20),
    left: mm(SIDE), right: mm(SIDE) } }, // equal sides: nothing to mirror
  locale: t({ en: 'en-gb', es: 'es' }), layout: { layoutType: 'single' },
  bodyText: { fontFamily: TEXT, fontSize: pt(11), lineHeight: pt(GRID), color: col('ink'),
    textAlign: 'left', firstLineIndent: pt(0) }, // ragged, so no word is hyphenated
  headings: { fontFamily: LABEL, // the titles print through designs, but are measured in it
    levels: [
      // A unit opens on a recto; its band is anchored to the page and paints up to the trim.
      { level: 1, breakBefore: { enabled: true, parity: 'odd' }, advancedDesign: opener },
      H2] },
  headingStyles: [activity('oye', 'oreja'), activity('lee', 'libro'), activity('mira', 'ojo'),
    activity('repasa', 'lapiz')],
  // #region reading: the child's lines on multiples of the 15 pt grid, the instructions at 10 pt
  // A 24 pt chip is 10.4 mm tall: at 30 pt (10.6 mm) leading the chips of two sentences would
  // stand 0.1 mm apart, so every line the child reads has 45 pt, and the syllables 60 pt.
  paragraphStyles: [
    { id: 'consigna', fontFamily: LABEL, fontSize: pt(10), lineHeight: pt(GRID),
      color: col('muted') }, // the instruction under each activity
    { id: 'fila', fontSize: pt(34), lineHeight: pt(4 * GRID), textAlign: 'center' },
    { id: 'palabras', fontSize: pt(24), lineHeight: pt(3 * GRID), textAlign: 'center' },
    { id: 'lectura', fontSize: pt(24), lineHeight: pt(3 * GRID) },
    { id: 'colofon', fontSize: pt(7.5), lineHeight: pt(10), // Andika: Playpen has no italic
      color: col('muted'), marginTop: pt(GRID) },
  ],
  // #endregion
  // #region boxes: an activity on cream, the note for the family under a rule
  calloutStyles: [
    { id: 'colorea', background: col('cream'), borderRadius: mm(4),
      marginTop: pt(0), // the :::space before the box is the whole gap above it
      padding: { top: mm(4), right: mm(5), bottom: mm(5), left: mm(5) },
      titleStyle: { fontFamily: LABEL, fontSize: pt(15), fontWeight: 700, color: col('ink') },
      body: { fontFamily: LABEL, fontSize: pt(10), lineHeight: pt(GRID), color: col('muted') } },
    { id: 'familia', backgroundEnabled: false,
      stripe: { enabled: true, side: 'top', width: pt(2.5), color: col('rule') },
      padding: { top: mm(3), right: mm(0), bottom: mm(0), left: mm(0) },
      titleStyle: { fontFamily: LABEL, fontSize: pt(8.5), fontWeight: 700, color: col('ink'),
        ...tag },
      body: { fontSize: pt(10.5), lineHeight: pt(GRID) } },
  ],
  // #endregion
  header: { elements: [] },
  footer: { elements: [ // the folio on the outer edge, the series beside it
    ...folio('odd', 'bottom-right', -SIDE, 'bottom-right', -(SIDE + FOLIO + 3)),
    ...folio('even', 'bottom-left', SIDE, 'bottom-left', SIDE + FOLIO + 3)] },
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
Exemple Markdown · 90 lignes · content.en.md
title: "Letter by Letter"
---

# Mm {kicker="Letter by Letter · Phonics book 1" unit="Unit 12" name="the sound m"}

## Listen and say {style="oye"}

:::paragraphs{style="consigna"}
Say each sound, then blend the sounds into a word. In the second row, the m comes last.
:::

:::paragraphs{style="fila"}
{m·a·p} {m·e·n} {m·o·p}

{S·a·m} {d·i·m} {g·u·m}
:::

## Read the words {style="lee"}

:::paragraphs{style="consigna"}
A word takes the colour of its vowel; the m is filled. The word below it rhymes with it.
:::

:::paragraphs{style="palabras"}
{m·a·t} {m·a·n} {m·u·g} {m·o·p}

{s·a·t} {p·a·n} {t·u·g} {t·o·p}
:::

## Look and read {style="mira"}

:::paragraphs{style="consigna"}
Say the name of each picture, then read it sound by sound.
:::

::resource{id="dibujos"}

## Trace {style="repasa"}

:::paragraphs{style="consigna"}
Start at the dot and follow the arrow. Then trace the words.
:::

::resource{id="trazos"}

## Read the sentences {style="lee"}

:::paragraphs{style="consigna"}
Read slowly. The first time a new word comes up, it is split into its sounds.
:::

:::paragraphs{style="lectura"}
Sam and {T·o·m} sat on a mat.

Sam and Tom got mud on it.

Tom got {M·u·m}.

Mum got a mop.
:::

:::space{lines=1}

:::callout{type="colorea" title="Read and colour"}
These are the colours of the vowels:

:::paragraphs{style="palabras"}
:chip[a]{style="a"} :chip[e]{style="e"} :chip[i]{style="i"} :chip[o]{style="o"} :chip[u]{style="u"}
:::

:::space{lines=1}

Colour each word with the colour of its vowel.

:::paragraphs{style="palabras"}
:chip[m]{style="pinta"}:chip[o]{style="pinta"}:chip[p]{style="pinta"} :chip[m]{style="pinta"}:chip[a]{style="pinta"}:chip[t]{style="pinta"} :chip[m]{style="pinta"}:chip[u]{style="pinta"}:chip[g]{style="pinta"} :chip[m]{style="pinta"}:chip[e]{style="pinta"}:chip[n]{style="pinta"}

:chip[d]{style="pinta"}:chip[i]{style="pinta"}:chip[m]{style="pinta"} :chip[g]{style="pinta"}:chip[u]{style="pinta"}:chip[m]{style="pinta"} :chip[m]{style="pinta"}:chip[a]{style="pinta"}:chip[p]{style="pinta"} :chip[m]{style="pinta"}:chip[a]{style="pinta"}:chip[n]{style="pinta"}
:::
:::

:::callout{type="familia" title="For parents and carers"}
Read the words on page 37: your child says each sound, then blends them. Say *mmm* with closed lips, not *muh*. If your child mixes up *map* and *mop*, do not say the word: point to the middle sound and ask its colour. Ten minutes a day is enough; stop while your child still wants more.
:::

:::paragraphs{style="colofon"}
*Letter by Letter* is a primer invented for the Postext Cookbook. Text: CC BY 4.0. Watercolours: diffusion models.

Set in Andika, DynaPuff and Playpen Sans (SIL Open Font License).
:::
`; // content.<lang>.md, inlined by the Cookbook

// #region art: the band, the icons and the tracing rows, drawn in the palette's colours
// The picture words are watercolours, JPEGs in assets/ painted on white and multiplied by the
// cream, so they sit on the band and the tiles without a box. The rest is drawn here, with no
// words in it: the tracing letters are strokes and every label is set by the page.
const P = palette;
const n = (v) => +v.toFixed(2);
const svgDoc = (w, h, body) => `<svg xmlns="http://www.w3.org/2000/svg" width="${w * 10}" `
  + `height="${h * 10}" viewBox="0 0 ${w} ${h}">${body}</svg>`;
const shape = (d, fill) => `<path d="${d}" fill="${fill}"/>`;
const line = (d, color, w, extra = '') => `<path d="${d}" fill="none" stroke="${color}" `
  + `stroke-width="${w}" stroke-linecap="round" stroke-linejoin="round"${extra}/>`;
const dot = (x, y, r, fill) => `<circle cx="${n(x)}" cy="${n(y)}" r="${n(r)}" fill="${fill}"/>`;
const drawings = {
  banda: () => svgDoc(210, BAND, shape(`M0 0H210V${BAND - 6}C190 ${BAND - 1} 172 ${BAND - 9} 150 `
    + `${BAND - 6}S102 ${BAND + 1} 76 ${BAND - 5} 28 ${BAND - 12} 0 ${BAND - 6}Z`, P.cream)),
};
// The activity icons: a white glyph on an ink disc.
const icon = (glyph) => svgDoc(20, 20, dot(10, 10, 10, P.ink) + glyph);
Object.assign(drawings, {
  oreja: () => icon(line('M7.5 8.5C7.5 5 10 3.5 12.5 3.5C15.5 3.5 16.5 6 16.5 8C16.5 11 13.5 '
    + '11.5 13 14C12.5 16.5 10 17 8.5 15.5M10 8.5C10 7 11 6 12.5 6C13.8 6 14.3 7.2 14 8.3',
  P.paper, 1.5)),
  ojo: () => icon(line('M3.5 10Q10 3.5 16.5 10Q10 16.5 3.5 10Z', P.paper, 1.5)
    + dot(10, 10, 2.4, P.paper)),
  libro: () => icon(line('M10 6.5C7.5 5 5.5 5 4 5.8V14.8C5.5 14 7.5 14 10 15.5C12.5 14 14.5 14 '
    + '16 14.8V5.8C14.5 5 12.5 5 10 6.5ZM10 6.5V15.5', P.paper, 1.3)),
  lapiz: () => icon(line('M5.5 14.5L6.5 11L13.5 4L16 6.5L9 13.5ZM12 5.5L14.5 8', P.paper, 1.3)),
});
// Tracing: rows on writing guides, a model letter in ink, then dashed ones to go over.
const TRACE = { w: 170, first: 26, pitch: 20.5 }; // mm
const guides = (b) => line(`M0 ${b - 16}H${TRACE.w}M0 ${b}H${TRACE.w}`, P.rule, 0.4)
  + line(`M0 ${b - 8}H${TRACE.w}`, P.rule, 0.35, ' stroke-dasharray="1 1"');
// Letters as strokes: x-height 8, capitals 16, from the baseline b; [path, width].
const glyphs = {
  m: (x, b) => [`M${x} ${b - 8}V${b}M${x} ${b - 5.4}C${x} ${b - 7.4} ${x + 1.4} ${b - 8} `
    + `${x + 2.7} ${b - 8}S${x + 5.3} ${b - 7.2} ${x + 5.3} ${b - 5.4}V${b}M${x + 5.3} ${b - 5.4}`
    + `C${x + 5.3} ${b - 7.4} ${x + 6.7} ${b - 8} ${x + 8} ${b - 8}S${x + 10.6} ${b - 7.2} `
    + `${x + 10.6} ${b - 5.4}V${b}`, 10.6],
  M: (x, b) => [`M${x} ${b}V${b - 16}L${x + 6} ${b - 6}L${x + 12} ${b - 16}V${b}`, 12],
  a: (x, b) => [`M${x + 6.4} ${b - 4}A3.2 4 0 0 0 ${x} ${b - 4}A3.2 4 0 0 0 ${x + 6.4} ${b - 4}`
    + `M${x + 6.4} ${b - 8}V${b}`, 6.4],
  e: (x, b) => [`M${x + 0.2} ${b - 4}H${x + 6.8}C${x + 6.8} ${b - 6.4} ${x + 5.2} ${b - 8} `
    + `${x + 3.5} ${b - 8}S${x + 0.2} ${b - 6.2} ${x + 0.2} ${b - 4}S${x + 1.8} ${b} ${x + 3.7} `
    + `${b}C${x + 5} ${b} ${x + 6} ${b - 0.5} ${x + 6.7} ${b - 1.3}`, 6.8],
  i: (x, b) => [`M${x + 0.6} ${b - 8}V${b}M${x + 0.6} ${b - 11.4}V${b - 11}`, 1.2],
  o: (x, b) => [`M${x + 6.8} ${b - 4}A3.4 4 0 0 0 ${x} ${b - 4}A3.4 4 0 0 0 ${x + 6.8} ${b - 4}`,
    6.8],
  u: (x, b) => [`M${x} ${b - 8}V${b - 2.8}C${x} ${b - 1} ${x + 1.3} ${b} ${x + 3} ${b}S${x + 6.2} `
    + `${b - 1} ${x + 6.2} ${b - 2.8}M${x + 6.2} ${b - 8}V${b}`, 6.2],
  n: (x, b) => [`M${x} ${b - 8}V${b}M${x} ${b - 5.4}C${x} ${b - 7.4} ${x + 1.4} ${b - 8} `
    + `${x + 2.7} ${b - 8}S${x + 5.3} ${b - 7.2} ${x + 5.3} ${b - 5.4}V${b}`, 5.3],
  t: (x, b) => [`M${x + 1.6} ${b - 12}V${b - 2}C${x + 1.6} ${b - 0.7} ${x + 2.4} ${b} ${x + 3.8} `
    + `${b}M${x} ${b - 8}H${x + 3.8}`, 3.8],
};
const KERN = 1.8; // mm between letters
const write = (word, x, b) => word.split('').reduce(([d, at], ch) => {
  const [path, w] = glyphs[ch](at, b);
  return [d + path, at + w + KERN];
}, ['', x]); // [path, x after the last letter + KERN]
const dashed = ([d]) => line(d, P.muted, 1, ' stroke-dasharray="1.1 1"');
// The model: ink strokes, a teal dot where the pencil starts and an arrow beside the stem
// pointing the way the first stroke goes (dir 1 down, −1 up).
const model = (letter, b, [x, y], dir) => line(write(letter, 4, b)[0], P.ink, 1.3)
  + dot(x, y, 1.2, P.i) + line(`M${x - 2.4} ${y + dir * 1.5}V${y + dir * 6}`, P.i, 0.6)
  + shape(`M${x - 3.5} ${y + dir * 5.2}H${x - 1.3}L${x - 2.4} ${y + dir * 7.2}Z`, P.i);
const repeat = (letter, b) => Array.from({ length: 7 }, (_, k) =>
  dashed(write(letter, TRACE.first + k * TRACE.pitch, b))).join('');
// The last row: the five syllables, or three words of the English unit, each centred in
// its share of the row.
const TRACED = t({ en: ['man', 'mat', 'men'], es: ['ma', 'me', 'mi', 'mo', 'mu'] });
const syllableRow = (b) => TRACED.map((syll, k) => {
  const w = write(syll, 0, b)[1] - KERN;
  return dashed(write(syll, (k + 0.5) * (TRACE.w / TRACED.length) - w / 2, b));
}).join('');
drawings.trazos = () => svgDoc(TRACE.w, 67, guides(17) + model('m', 17, [4, 9], 1)
  + repeat('m', 17) + guides(41) + model('M', 41, [4, 41], -1) + repeat('M', 41)
  + guides(65) + syllableRow(65));
// The watercolours of each edition, by resource id: [file, width, height] in px. The map
// and the monkey serve both.
const painted = (ids) => Object.fromEntries(ids.map((id) => [id, [`${id}-640.jpg`, 640, 480]]));
const PAINTINGS = t({
  en: { monkey: ['mono-640.jpg', 640, 480], moon: ['moon-480.jpg', 480, 480],
    map: ['mapa-640.jpg', 640, 480], ...painted(['mat', 'man', 'mug', 'mop', 'mud']) },
  es: { mariposa: ['mariposa-660.jpg', 660, 540], manzana: ['manzana-480.jpg', 480, 480],
    ...painted(['mano', 'mapa', 'mesa', 'mimosa', 'mono', 'muneca']) } });
const ALT = t({
  en: { banda: 'A cream band with a wavy lower edge', monkey: 'A monkey sitting',
    moon: 'A yellow crescent moon with two stars',
    map: 'A treasure map with a river and a path to a cross', mat: 'A striped doormat',
    man: 'A man waving', mug: 'A blue mug with white dots', mop: 'A string mop',
    mud: 'A puddle of mud', oreja: 'An ear', ojo: 'An eye', libro: 'An open book',
    lapiz: 'A pencil',
    trazos: 'Three rows of writing guides: the small m and the capital M, each with a model and '
      + 'seven dotted letters to trace, and the dotted words man, mat and men' },
  es: { banda: 'Franja de color crema con el borde ondulado',
    manzana: 'Una manzana roja con una hoja', mariposa: 'Una mariposa morada con manchas amarillas',
    mano: 'Una mano abierta', mapa: 'Un mapa del tesoro con un río y un camino hasta una cruz',
    mesa: 'Una mesa con una manzana y una taza', mono: 'Un mono sentado',
    mimosa: 'Una rama de mimosa con flores amarillas y hojas plumosas',
    muneca: 'Una muñeca de trapo con coletas y vestido morado',
    oreja: 'Una oreja', ojo: 'Un ojo', libro: 'Un libro abierto', lapiz: 'Un lápiz',
    trazos: 'Tres pautas: la eme minúscula y la mayúscula, cada una con un modelo y siete de '
      + 'puntos para repasar, y las sílabas ma, me, mi, mo y mu de puntos' } });
// Each picture is a resource that the opener, a heading style, a table cell or the text names
// by id. Drawings in px, 10 to the millimetre (the viewBox's own).
const size = (svg) => svg.match(/width="(\d+)" height="(\d+)"/).slice(1).map(Number);
const common = (id) => ({ id, typeId: 'lamina', altText: ALT[id], createdAt: 0, updatedAt: 0 });
const artwork = [...Object.entries(drawings).map(([id, draw]) => {
  const [width, height] = size(draw());
  return { ...common(id), kind: 'svg', svg: { fileId: `${id}.svg`, width, height },
    ...(id === 'trazos' && here(id)) };
}), ...Object.entries(PAINTINGS).map(([id, [fileId, w, h]]) => ({ ...common(id),
  kind: 'bitmap', bitmap: { fileId, format: 'jpeg', width: w, height: h } }))];
// #endregion

const resources = [...artwork, here('dibujos', { kind: 'table',
  table: { styleId: 'dibujos', model: grid } })];

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = { Andika: ['400', '700'], DynaPuff: ['700'], 'Playpen Sans': ['400', '600', '700'] };

// ─── 4 · Build & show ───────────────────────────────────────────────────────
const text = syllables(markdown);
await Promise.all([prepareFonts(text, config(), kitFonts(FONTS)), // every face before the build
  ...Object.entries(drawings).map(([id, draw]) => loadSvg(`${id}.svg`, draw())),
  ...Object.values(PAINTINGS).map(([file]) => loadImage(file, asset(file)))]);
const continuation = { pageIndexOffset: 36, pageNumbering: { startAt: 37 } }; // 37: a recto
const doc = await buildDocumentWithFonts({ markdown: text, resources, continuation },
  config(),
  kitFonts(FONTS));
showPages(doc, { title: t({ en: 'Letter by Letter · The m', es: 'Letra a letra · La eme' }) });

Kit · core, fonts, viewer, images : identique dans toutes les recettes · 270 lignes
// ─── Kit ── helpers shared by every Cookbook recipe · postext.dev/cookbook ─────

// ─── Kit · core v1 ── the same in every recipe · postext.dev/cookbook
function mm(value) { return { value, unit: 'mm' }; }
function pt(value) { return { value, unit: 'pt' }; }
function em(value) { return { value, unit: 'em' }; }
/** The sample language's string: t({ en: 'Figure', es: 'Figura' }). */
function t(strings) { return strings[LANG] ?? Object.values(strings)[0]; }
/** A file in this recipe's assets folder, served from the Postext repo by jsDelivr. */
function asset(file) { return `https://cdn.jsdelivr.net/gh/drnachio/postext@main/cookbook/${RECIPE}/assets/${file}`; }

// ─── Kit · fonts v3 ── the same in every recipe · postext.dev/cookbook
// Postext loads the faces a config asks for before layout (prepareFonts,
// buildDocumentWithFonts) and asks the kit for the files: Fontsource's, the
// files the PDF embeds too.

/** The options of buildDocumentWithFonts / prepareFonts / withLoadedFonts:
 *  the Fontsource resolver, and the faces of FONTS loaded with the ones the
 *  config names. FONTS = { 'Family Name': ['400', '400i', '700'] }. */
function kitFonts(FONTS = {}) {
  const faces = Object.entries(FONTS).flatMap(([family, specs]) => specs.map((spec) =>
    ({ family, weight: parseInt(spec, 10), style: spec.endsWith('i') ? 'italic' : 'normal' })));
  return { resolve: fontsourceResolver, faces };
}

/** A face's Fontsource files, in a fixed order: latin, then latin-ext and greek
 *  when `text` needs them and the family ships them (kitSubsetsFor), each with
 *  its unicode-range. Null for a weight or slant Fontsource does not ship. */
async function fontsourceResolver(family, weight, style, { text = '' } = {}) {
  const id = fontsourceId(family);
  const meta = await fontsourceMeta(family);
  if (meta && !(meta.weights.includes(weight) && meta.styles.includes(style))) return null;
  kitStatus('Loading fonts…');
  const at = await fontsourceAt(id);
  return ['latin', ...kitSubsetsFor(text, meta)].map((subset) => ({
    source: `${at}files/${id}-${subset}-${weight}-${style}.woff2`,
    unicodeRange: kitRanges()[subset],
  }));
}

/** The unicode-range of each Fontsource file the kit loads (a function: the
 *  kit is inlined after the pen's code, which runs before a const would be set). */
function kitRanges() {
  return {
    latin: 'U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,'
      + 'U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD',
    'latin-ext': 'U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,'
      + 'U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF',
    greek: 'U+0370-03FF',
  };
}

/** For the cjk, arabic and comics blocks, which add their own files: the
 *  faces of `faces` = { 'Family Name': ['400', '400i', '700'] }. `text` is the sample:
 *  č ł † α χ also load latin-ext and greek files (kitSubsetsFor). With
 *  `optional`, a face Fontsource does not ship is skipped instead of failing.
 *  The files are added once all have loaded, in the order asked (latin, then
 *  latin-ext, then greek), whatever order they arrive in: the last one added
 *  wins a character two files hold. Resolves to the number of faces added. */
async function loadFonts(faces, text = '', { optional = false } = {}) {
  kitStatus('Loading fonts…');
  const ranges = kitRanges();
  const jobs = [];
  for (const [family, specs] of Object.entries(faces)) {
    const id = fontsourceId(family);
    const todo = [...new Set(specs)].map((spec) => [parseInt(spec, 10), spec.endsWith('i') ? 'italic' : 'normal'])
      .filter(([weight, style]) => !hasFace(family, weight, style)); // before any await
    const at = fontsourceAt(id);
    const meta = optional || /[^\0-ÿ]/u.test(text) ? await fontsourceMeta(family) : null;
    const subsets = ['latin', ...kitSubsetsFor(text, meta)];
    for (const [weight, style] of todo) {
      if (optional && !(meta?.weights.includes(weight) && meta.styles.includes(style))) continue;
      for (const subset of subsets) {
        const url = `${await at}files/${id}-${subset}-${weight}-${style}.woff2`;
        const face = new FontFace(family, `url(${url}) format('woff2')`,
          { weight: String(weight), style, unicodeRange: ranges[subset] });
        jobs.push(face.load().catch(() => {
          if (subset === 'latin' && !optional) throw new Error(`Fontsource has no ${family} ${weight} ${style}`);
        }));
      }
    }
  }
  const ready = await Promise.all(jobs).catch((error) => { kitFail(error); throw error; });
  return ready.filter((face) => face && document.fonts.add(face)).length;
}

/** A loaded FontFace covers this family, weight and style (fonts.check() would
 *  also say yes for families nobody declared). */
function hasFace(family, weight, style) {
  for (const face of document.fonts) {
    if (face.status !== 'loaded' || face.style !== style) continue;
    if (face.family.replace(/^["']|["']$/g, '') !== family) continue;
    const [low, high = low] = face.weight.split(' ').map(Number);
    if (weight >= low && weight <= high) return true;
  }
  return false;
}

/** The files beyond latin `text` needs that `meta`'s family ships. */
function kitSubsetsFor(text, meta) {
  return [[/[Ā-˿ᴀ-ᶿḀ-ỿ†ℓⱠ-Ɀ꜠-ꟿ]/u, 'latin-ext'], [/[Ͱ-Ͽ]/u, 'greek']]
    .filter(([re, x]) => re.test(text) && meta?.subsets?.includes(x)).map(([, x]) => x);
}

/** Fontsource's id for a family: 'Source Serif 4' → 'source-serif-4'. */
function fontsourceId(family) { return family.toLowerCase().replace(/\s+/g, '-'); }

/** A package's folder at the one version @5 names now (#766). */
function fontsourceAt(id, u = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@`) {
  return (fontsourceAt.c ??= {})[id] ??= fetch(u + '5/package.json').then((r) => r.json())
    .then((p) => p.version || 5, () => 5).then((v) => `${u}${v}/`);
}

/** The family's Fontsource metadata (weights, styles, subsets), or null. */
function fontsourceMeta(family) {
  fontsourceMeta.cache ??= new Map();
  const id = fontsourceId(family);
  if (!fontsourceMeta.cache.has(id)) {
    fontsourceMeta.cache.set(id, fetch(`https://api.fontsource.org/v1/fonts/${id}`)
      .then((res) => (res.ok ? res.json() : null), () => null));
  }
  return fontsourceMeta.cache.get(id);
}

// ─── Kit · viewer v2 ── the same in every recipe · postext.dev/cookbook
/** The pages as spreads on a dark desk, page 1 alone, then verso | recto,
 *  each painted when it scrolls near. Other options go to renderPageToCanvas. */
function showPages(docs, { title, width = 460, ...render } = {}) {
  const root = viewer(title);
  const pages = [docs].flat().flatMap((doc) =>
    doc.pages.map((page) => ({ doc, page, n: (doc.pageIndexOffset ?? 0) + page.index })));
  const spreads = [];
  let verso = null;
  for (const p of pages) {
    if (p.n % 2 === 1) { if (verso) spreads.push([verso, null]); verso = p; }
    else { spreads.push([verso, p]); verso = null; }
  }
  if (verso) spreads.push([verso, null]);
  const density = Math.min(window.devicePixelRatio || 1, 2);
  showPages.painter?.disconnect();
  const painter = new IntersectionObserver((entries) => {
    for (const { isIntersecting, target } of entries) {
      if (!isIntersecting) continue;
      painter.unobserve(target);
      const { doc, page } = target.postext;
      renderPageToCanvas(page, doc, target, { ...render, scale: (width * density) / page.width });
    }
  }, { rootMargin: '800px' });
  showPages.painter = painter;
  root.replaceChildren(...spreads.map((pair) => {
    const spread = document.createElement('div');
    spread.className = 'pt-spread';
    for (const p of pair) {
      const figure = document.createElement('figure');
      if (p) {
        const label = p.page.pageLabel || String(p.n + 1);
        const canvas = document.createElement('canvas');
        canvas.postext = p;
        canvas.style.aspectRatio = `${p.page.width} / ${p.page.height}`;
        canvas.setAttribute('role', 'img');
        canvas.setAttribute('aria-label', `Page ${label}`);
        const folio = document.createElement('figcaption');
        folio.textContent = label;
        figure.append(canvas, folio);
        painter.observe(canvas);
      } else figure.className = 'pt-blank';
      spread.append(figure);
    }
    return spread;
  }));
  kitStatus(`${pages.length} ${pages.length === 1 ? 'page' : 'pages'}`);
  document.documentElement.dataset.postext = 'ready';
  return pages.length;
}

/** The desk, the bar and the error reporting, created once. */
function viewer(title) {
  if (!document.getElementById('pt-kit')) {
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit">
      :root { color-scheme: dark; }
      body { margin: 0; background: #0e1014; color: #b9bcc4; font: 13px/1.45 system-ui, sans-serif; }
      #pt-bar { position: sticky; top: 0; z-index: 1; display: flex; flex-wrap: wrap; align-items: center;
        gap: 6px 16px; padding: 10px 16px; background: rgb(14 16 20 / .92); backdrop-filter: blur(6px);
        border-bottom: 1px solid #23262d; }
      #pt-bar strong { color: #f4f1ea; font-weight: 600; }
      #pt-actions { display: flex; gap: 12px; margin-left: auto; }
      #pt-actions a, #pt-actions button { color: #d8a21a; font: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
      #pages { display: grid; justify-items: center; gap: 48px; padding: 32px 16px 72px; }
      .pt-spread { display: flex; }
      .pt-spread figure { margin: 0; width: min(460px, 44vw); }
      .pt-spread canvas { display: block; width: 100%; background: #fff;
        box-shadow: 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figure:first-child canvas { box-shadow: inset -14px 0 14px -14px rgb(0 0 0 / .18), 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figcaption { margin-top: 10px; text-align: center; font: 600 10px/1 system-ui, sans-serif;
        letter-spacing: .18em; text-transform: uppercase; color: #6c7079; }
      .pt-blank { visibility: hidden; }
      @media (max-width: 760px) {
        .pt-spread { flex-direction: column; gap: 32px; }
        .pt-spread figure { width: min(460px, 92vw); }
        .pt-blank { display: none; }
      }
    </style>`);
    document.body.insertAdjacentHTML('afterbegin',
      '<header id="pt-bar"><strong id="pt-title"></strong><span id="pt-status" role="status"></span><span id="pt-actions"></span></header>');
    document.getElementById('pt-title').textContent = document.title || 'Postext';
    addEventListener('error', (event) => kitFail(event.error ?? event.message));
    addEventListener('unhandledrejection', (event) => kitFail(event.reason));
  }
  if (title) document.getElementById('pt-title').textContent = title;
  return document.getElementById('pages')
    ?? document.body.appendChild(Object.assign(document.createElement('main'), { id: 'pages' }));
}

function kitStatus(text) {
  viewer();
  document.getElementById('pt-status').textContent = text;
}

function kitFail(error) {
  document.documentElement.dataset.postext = 'error';
  kitStatus(`Error: ${error?.message ?? error}`);
}

// ─── Kit · images v3 ── recipes with pictures · postext.dev/cookbook
/** Registers a photo or PNG for the canvas and keeps its bytes for the PDF.
 *  fetch → ImageBitmap never taints the canvas (a plain cross-origin <img> would). */
async function loadImage(fileId, url) {
  const res = await fetch(url);
  if (!res.ok) throw new Error(`Image not found (${res.status}): ${url}`);
  const bytes = new Uint8Array(await res.arrayBuffer());
  registerResourceImage(fileId, await createImageBitmap(new Blob([bytes])));
  (loadImage.bytes ??= new Map()).set(fileId, bytes);
}

/** Registers SVG markup as a vector image, its fonts inside (inlineSvgFonts, ≥ 1.25).
 *  `options` go to registerResourceImage: { singleInk: true } tints it on the canvas. */
async function loadSvg(fileId, svg, options) {
  if (typeof inlineSvgFonts === 'function') svg = await inlineSvgFonts(svg, svgFaces);
  const img = new Image();
  img.src = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svg)}`;
  await img.decode();
  registerResourceImage(fileId, img, options);
  (loadImage.bytes ??= new Map()).set(fileId, new TextEncoder().encode(svg));
}

/** A face's Fontsource files: nearest weight; latin + what the SVG sets. */
async function svgFaces(family, weight, style, { codePoints = [] } = {}) {
  const [id, m] = [fontsourceId(family), await fontsourceMeta(family)];
  const w = m?.weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a)) ?? weight;
  const s = m?.styles.includes(style) === false ? 'normal' : style;
  return Promise.all(['latin', ...kitSubsetsFor(String.fromCodePoint(...codePoints), m)].map(async (x) => new Uint8Array(
    await (await fetch(`${await fontsourceAt(id)}files/${id}-${x}-${w}-${s}.woff2`)).arrayBuffer())));
}

/** renderToPdf({ resourceBytes: imageBytes }) */
function imageBytes(fileId) { return loadImage.bytes?.get(fileId); }

/** renderToHtml({ resourceImageUrl: imageUrl }) */
function imageUrl(fileId) {
  const bytes = imageBytes(fileId);
  if (!bytes) return undefined;
  imageUrl.urls ??= new Map();
  if (!imageUrl.urls.has(fileId)) {
    const type = /\.svg$/i.test(fileId) ? 'image/svg+xml' : /\.png$/i.test(fileId) ? 'image/png' : 'image/jpeg';
    imageUrl.urls.set(fileId, URL.createObjectURL(new Blob([bytes], { type })));
  }
  return imageUrl.urls.get(fileId);
}

// ─── /Kit ───────────────────────────────────────────────────────────────────────