Function generateThumbnails

scripts/optimize-images.js:139–180

(inputPath, filename)

// 生成缩略图 (with better error recovery)
async function generateThumbnails(inputPath, filename) {
  const baseName = path.parse(filename).name;
  
  try {
    const image = sharp(inputPath);
    const metadata = await image.metadata();
    
    // Skip if image is already smaller than thumbnail size
    if (metadata.width <= config.sizes.thumbnail.width && 
        metadata.height <= config.sizes.thumbnail.height) {
      BuildLogger.log(`⏭️  跳过缩略图生成: ${filename} (已足够小)`);
      return { success: true, skipped: true };
    }
    
    // Generate thumbnail
    const thumbnailPath = path.join(config.outputDir, `${baseName}-thumb.jpg`);
    
    // Check if thumbnail already exists and is newer
    if (fs.existsSync(thumbnailPath)) {
      const inputStats = await stat(inputPath);
      const thumbStats = await stat(thumbnailPath);
      if (thumbStats.mtime > inputStats.mtime) {
        BuildLogger.log(`⏭️  跳过已存在的缩略图: ${path.basename(thumbnailPath)}`);
        return { success: true, skipped: true };
      }
    }
    
    await sharp(inputPath)
      .resize(config.sizes.thumbnail.width, config.sizes.thumbnail.height, {
        fit: 'cover',
        position: 'center'
      })
      .jpeg({ quality: 80, progressive: true })
      .toFile(thumbnailPath);
    
    BuildLogger.success(' 缩略图生成: ${path.basename(thumbnailPath)}');
    return { success: true, skipped: false };
  } catch (error) {
    console.error(`❌ 缩略图生成失败: ${filename}`, error.message);
    return { success: false, error: error.message };
  }
}

// 生成图片清单
function generateManifest() {