Function findIconPath

src/main/core/commandScanner/linuxScanner.ts:127–180

* 在 XDG 图标主题中查找图标文件路径 * 如果找不到则返回 null

(iconName: string)

 * 如果找不到则返回 null
 */
async function findIconPath(iconName: string): Promise<string | null> {
  // 如果是绝对路径且存在，直接返回
  if (iconName.startsWith('/')) {
    try {
      await fs.access(iconName)
      return iconName
    } catch {
      // 忽略
    }
  }

  // 去除扩展名（.desktop 文件中有时会带扩展名）
  const baseName = iconName.replace(/\.(png|svg|xpm)$/, '')

  const searchPaths = getIconSearchPaths()

  for (const searchPath of searchPaths) {
    // 先检查各个主题目录下的常用尺寸
    try {
      const entries = await fs.readdir(searchPath, { withFileTypes: true })
      const themes = entries.filter((e) => e.isDirectory()).map((e) => e.name)
      for (const theme of ['hicolor', ...themes]) {
        for (const size of ICON_PREFERRED_SIZES) {
          for (const category of ['apps', 'applications']) {
            for (const ext of ICON_EXTENSIONS) {
              const iconPath = path.join(searchPath, theme, size, category, baseName + ext)
              try {
                await fs.access(iconPath)
                return iconPath
              } catch {
                // 忽略
              }
            }
          }
        }
      }
    } catch {
      // 目录不存在，跳过
    }

    // pixmaps 目录直接查找
    for (const ext of ICON_EXTENSIONS) {
      const iconPath = path.join(searchPath, baseName + ext)
      try {
        await fs.access(iconPath)
        return iconPath
      } catch {
        // 忽略
      }
    }
  }

  return null
}

// ============================================================
// 拼音首字母支持