Ninja tab-completion for PowerShell

ninja-complete.ps1

$ninjaCompleteBlock = {
    param($wordToComplete, $commandAst, $cursorPosition)
    
    $toComplete = [Regex]::Escape($wordToComplete)
    Select-String .\build.ninja -pattern "^build ($toComplete[\w-]*[\\/]?)[\w-]*:"
        | ForEach-Object { $_.Matches.Groups[1].Value.Trim() }
        | Sort-Object -CaseSensitive
}

Register-ArgumentCompleter -CommandName ninja -Native -ScriptBlock $ninjaCompleteBlock