Add the Next.js web app and shared lesson content.

Move lessons out of the C sources into JSON so the web client can use the same material as the desktop app, and point release builds at desktop/.

Co-authored-by: Cursor <cursoragent@cursor.com>

tools/extract/deutsch-u2.mjs

@@ -0,0 +1,159 @@
+import { readFileSync } from 'node:fs';
+import { parseArray, parseString } from '../lib/cparse.mjs';
+import {
+  choiceItem,
+  freeItem,
+  opt,
+  typedItem,
+  verbFill,
+  vocabSections,
+} from './deutsch-helpers.mjs';
+
+/**
+ * Deutsch Unit 2 ("Familie und Freunde").
+ *
+ * Task order, titles and instruction keys come from the `u2exN` builders at the
+ * bottom of exercise_u2.c; each one names the `const` arrays holding its data.
+ */
+export function extractDeutschUnit2(desktopDir) {
+  const src = readFileSync(`${desktopDir}/exercise_u2.c`, 'utf8');
+  const tasks = [];
+
+  /** `build_verb_ex`: one pool feeding single-gap sentences. */
+  const verbTask = (number, title, subtitleKey, prefix, { gloss = false } = {}) => {
+    const meanings = parseArray(src, `${prefix}_mean`);
+    const glosses = gloss ? parseArray(src, `${prefix}_gloss`) : null;
+    return {
+      number,
+      title,
+      subtitleKey,
+      pool: parseArray(src, `${prefix}_pool`).map(String),
+      items: parseArray(src, `${prefix}_rows`).map((row, i) =>
+        verbFill(row, meanings[i], glosses && opt(glosses[i])
+          ? { glosses: [String(glosses[i])] }
+          : {})),
+    };
+  };
+
+  const choiceTask = (number, title, subtitleKey, prefix) => {
+    const meanings = parseArray(src, `${prefix}_mean`);
+    return {
+      number,
+      title,
+      subtitleKey,
+      items: parseArray(src, `${prefix}_rows`).map((row, i) => choiceItem(row, meanings[i])),
+    };
+  };
+
+  const typedTask = (number, title, subtitleKey, rowsName, bankName) => ({
+    number,
+    title,
+    subtitleKey,
+    ...(bankName ? { note: parseString(src, bankName) } : {}),
+    items: parseArray(src, rowsName).map(typedItem),
+  });
+
+  /* 1 — Verben konjugieren: two people, each a headed group over one pool. */
+  {
+    const pool = parseArray(src, 'g01_pool').map(String);
+    const groups = [
+      ['Peter Fritsch:', 'g01_peter', 'g01_peter_mean'],
+      ['Jana Nová und Pavol Korčák:', 'g01_jana', 'g01_jana_mean'],
+    ];
+
+    const items = groups.flatMap(([heading, rowsName, meanName]) => {
+      const meanings = parseArray(src, meanName);
+      return parseArray(src, rowsName).map((row, i) =>
+        verbFill(row, meanings[i], i === 0 ? { heading } : {}));
+    });
+
+    tasks.push({
+      number: 1,
+      title: 'Verben konjugieren',
+      subtitleKey: 'sub_verben',
+      pool,
+      items,
+    });
+  }
+
+  tasks.push(choiceTask(2, 'aus oder in', 'sub_ausin', 'g02'));
+  tasks.push(choiceTask(3, 'Fragewörter', 'sub_wer', 'g03'));
+  tasks.push(verbTask(4, 'sprechen', 'sub_sprich', 'g04'));
+  tasks.push(typedTask(5, 'Nationalitäten', 'sub_nation', 'g05_rows', 'g05_bank'));
+  tasks.push(typedTask(6, 'Woher?', 'sub_woher', 'g06_rows'));
+  tasks.push(typedTask(7, 'Länder schreiben', 'sub_laender', 'g07_rows'));
+  tasks.push(verbTask(8, 'Verben einsetzen', 'sub_verb2', 'g08'));
+
+  /* 9 — Freie Antwort */
+  tasks.push({
+    number: 9,
+    title: 'Freie Antwort',
+    subtitleKey: 'sub_free',
+    items: parseArray(src, 'ex9_free_qs').map(freeItem),
+  });
+
+  tasks.push(verbTask(10, 'Euro', 'sub_euro', 'g10'));
+  tasks.push(typedTask(11, 'Wörter suchen', 'sub_wortsuchen', 'g11_rows'));
+  tasks.push(choiceTask(12, 'Was ist richtig?', 'sub_verb2', 'g12'));
+
+  /* 13 — Ordne zu: a Fragewort dropdown and an answer dropdown per row. */
+  {
+    const meanings = parseArray(src, 'g13_mean');
+    tasks.push({
+      number: 13,
+      title: 'Ordne zu',
+      subtitleKey: 'sub_ordne',
+      pool: parseArray(src, 'g13_fw_pool').map(String),
+      altPool: parseArray(src, 'g13_ans_pool').map(String),
+      items: parseArray(src, 'g13_rows').map(([mid, fw, ans], i) => ({
+        kind: 'fill',
+        segments: ['', ` ${mid} → `, ''],
+        answers: [String(fw), String(ans)],
+        input: 'select',
+        gapPool: ['main', 'alt'],
+        label: `${i + 1}.`,
+        ...(opt(meanings[i]) ? { meaning: String(meanings[i]) } : {}),
+      })),
+    });
+  }
+
+  tasks.push(verbTask(14, 'Lückentext', 'sub_luecke', 'g14', { gloss: true }));
+  tasks.push(verbTask(15, 'Verbinde', 'sub_verbinde', 'g15', { gloss: true }));
+  tasks.push(verbTask(16, 'Zahlen', 'sub_zahlpaar', 'g16'));
+
+  /* 17 — Steckbrief */
+  tasks.push({
+    number: 17,
+    title: 'Steckbrief',
+    subtitleKey: 'sub_steckbrief',
+    items: parseArray(src, 's01_rows').map(([stem, sample]) => ({
+      kind: 'profile',
+      stem: String(stem),
+      sample: String(sample),
+    })),
+  });
+
+  /* 18 — Berufe: hangman, one round per profession. */
+  {
+    const words = parseArray(src, 'hm_words').map(String);
+    const tips = parseArray(src, 'hm_tips').map(String);
+    tasks.push({
+      number: 18,
+      title: 'Berufe',
+      subtitleKey: 'sub_berufe',
+      items: words.map((word, i) => ({ kind: 'hangman', word, hint: tips[i] })),
+    });
+  }
+
+  tasks.push(typedTask(19, 'Nationalität', 'sub_bistdu', 's03_rows'));
+
+  return {
+    id: 'unit-02',
+    subject: 'deutsch',
+    number: 2,
+    title: { cs: 'Aus aller Welt', en: 'Aus aller Welt' },
+    slides: [],
+    tasks,
+    vocab: vocabSections(src, 'u2_trans_sections'),
+  };
+}