param(
    [Parameter(Mandatory = $true)]
    [ValidatePattern('^[0-9a-fA-F]{40}$')]
    [string] $PaperCommit
)

$propertiesPath = Join-Path $PSScriptRoot "..\gradle.properties"
$properties = Get-Content -LiteralPath $propertiesPath -Raw
$updated = [regex]::Replace($properties, '(?m)^paperCommit=.*$', "paperCommit=$PaperCommit")
if ($updated -eq $properties) {
    throw "paperCommit was not found in $propertiesPath"
}
Set-Content -LiteralPath $propertiesPath -Value $updated -NoNewline

Write-Output "已将 Paper 固定到 $PaperCommit。合并前请运行 applyAllPatches 和兼容性测试。"