refactor: split downloader into modules

2026-07-22 17:46:35 +08:00
parent 1dfaed4dba
commit 536685e327
15 changed files with 935 additions and 881 deletions
@@ -0,0 +1,79 @@
+const fs = require('fs');
+const path = require('path');
+const { API, DOWNLOAD_DIR } = require('./config');
+const { fetchJSON } = require('./network');
+
+async function fetchLyric(songId) {
+  try {
+    const res = await fetchJSON(`${API.lyric}?id=${songId}`);
+    if (res.code !== 200) return null;
+    return res.data;
+  } catch {
+    return null;
+  }
+}
+
+function mergeLrc(lrc, tlyric) {
+  if (!lrc) return '';
+  if (!tlyric) return lrc;
+
+  const transMap = new Map();
+  for (const line of tlyric.split('\n')) {
+    const match = line.match(/^\[(\d+:\d+[\.:]\d+)\](.*)/);
+    if (match && match[2].trim()) transMap.set(match[1], match[2].trim());
+  }
+
+  const result = [];
+  for (const line of lrc.split('\n')) {
+    result.push(line);
+    const match = line.match(/^\[(\d+:\d+[\.:]\d+)\]/);
+    if (match && transMap.has(match[1])) result.push(`[${match[1]}]${transMap.get(match[1])}`);
+  }
+  return result.join('\n');
+}
+
+function parseCredits(lrcText) {
+  const credits = {};
+  if (!lrcText) return credits;
+  const labels = {
+    lyricist: /^(作词|作詞|词|填词|Lyricist|Lyrics? by|Written by)$/i,
+    composer: /^(作曲|曲|Composer|Composed by|Music by)$/i,
+    arranger: /^(编曲|編曲|Arranger|Arranged by)$/i,
+    producer: /^(制作人|製作人|出品人|监制|Producer|Produced by)$/i,
+    mixer: /^(混音|Mix(ing)?|Mixed by)$/i,
+  };
+  for (const raw of lrcText.split('\n')) {
+    const line = raw.replace(/^(\s*\[[^\]]*\]\s*)+/, '').trim();
+    const match = line.match(/^([^:：]{1,12})\s*[:：]\s*(.+)$/);
+    if (!match) continue;
+    const label = match[1].trim();
+    const value = match[2].trim().replace(/\s*\/\s*/g, '/');
+    if (!value) continue;
+    for (const [key, pattern] of Object.entries(labels)) {
+      if (pattern.test(label) && !credits[key]) {
+        credits[key] = value;
+        break;
+      }
+    }
+  }
+  return credits;
+}
+
+async function saveLyric(songId, fileName) {
+  const data = await fetchLyric(songId);
+  if (!data?.lrc) {
+    console.log('  ⚠️  未获取到歌词');
+    return;
+  }
+
+  const lrcPath = path.join(DOWNLOAD_DIR, fileName + '.lrc');
+  fs.writeFileSync(lrcPath, data.lrc, 'utf-8');
+  console.log(`  📄 歌词已保存: ${path.basename(lrcPath)}`);
+  if (data.tlyric?.trim()) {
+    const mergedPath = path.join(DOWNLOAD_DIR, fileName + '.合并翻译.lrc');
+    fs.writeFileSync(mergedPath, mergeLrc(data.lrc, data.tlyric), 'utf-8');
+    console.log(`  📄 翻译歌词已保存: ${path.basename(mergedPath)}`);
+  }
+}
+
+module.exports = { fetchLyric, mergeLrc, parseCredits, saveLyric };