# 把 .bat/.cmd 的行尾统一为 CRLF —— cmd.exe 必须用 CRLF, 裸 LF 会让它误解析。
# 症状: `if not defined X (` 被拆成 `'ned' 不是内部或外部命令` 之类的乱码报错。
# 触发场景: 用工具/编辑器写 .bat 时默认写成 LF (本项目踩过)。
#
# 幂等: 已是 CRLF 的文件不会被改动。
# 用法:
#   powershell -NoProfile -ExecutionPolicy Bypass -File tools\fix-lineend.ps1            # 处理项目根 + tools 下全部 .bat/.cmd
#   powershell ... -File tools\fix-lineend.ps1 -Files "a.bat","b.cmd"                    # 只处理指定文件
param([string[]]$Files)

if (-not $Files) {
  $root = Split-Path $PSScriptRoot -Parent
  $Files = @()
  $Files += Get-ChildItem (Join-Path $root '*.bat') -ErrorAction SilentlyContinue | ForEach-Object { $_.FullName }
  $Files += Get-ChildItem (Join-Path $root '*.cmd') -ErrorAction SilentlyContinue | ForEach-Object { $_.FullName }
  $Files += Get-ChildItem (Join-Path $PSScriptRoot '*.bat') -ErrorAction SilentlyContinue | ForEach-Object { $_.FullName }
  $Files += Get-ChildItem (Join-Path $PSScriptRoot '*.cmd') -ErrorAction SilentlyContinue | ForEach-Object { $_.FullName }
}

foreach ($f in $Files) {
  if (-not (Test-Path $f)) { Write-Output ("跳过(不存在): " + $f); continue }
  $bytes = [System.IO.File]::ReadAllBytes($f)
  # 统一成 CRLF: 先把 CRLF 归一为 LF, 再把 LF 展开为 CRLF
  $text = [System.Text.Encoding]::UTF8.GetString($bytes)
  $text = $text -replace "`r`n", "`n"
  $text = $text -replace "`r", "`n"
  $new = $text -replace "`n", "`r`n"
  if ($new -eq [System.Text.Encoding]::UTF8.GetString($bytes)) {
    Write-Output ("已是 CRLF: " + (Split-Path $f -Leaf))
  } else {
    # 不加 BOM (cmd 对 BOM 敏感, 且 .bat 无需 BOM)
    $enc = New-Object System.Text.UTF8Encoding($false)
    [System.IO.File]::WriteAllText($f, $new, $enc)
    Write-Output ("已修正为 CRLF: " + (Split-Path $f -Leaf))
  }
}