<#
.SYNTAX       clean-repos.ps1 [<parent-dir>]
.DESCRIPTION  cleans all Git repositories under the current/given directory from untracked files (including submodules)
.LINK         https://github.com/fleschutz/PowerShell
.NOTES        Author: Markus Fleschutz / License: CC0
#>

param($ParentDir = "$PWD")

try {
	$StopWatch = [system.diagnostics.stopwatch]::startNew()

	if (-not(test-path "$ParentDir" -pathType container)) { throw "Can't access directory: $ParentDir" }

	$Null = (git --version)
	if ($lastExitCode -ne "0") { throw "Can't execute 'git' - make sure Git is installed and available" }

	$Folders = (get-childItem "$ParentDir" -attributes Directory)
	$ParentDirName = (get-item "$ParentDir").Name
	"Cleaning $($Folders.Count) Git repositories at 📂$ParentDirName from untracked files ..."

	foreach ($Folder in $Folders) {
		$FolderName = (get-item "$Folder").Name
		"🧹 Cleaning 📂$FolderName ..."

		& git -C "$Folder" clean -fdx # force + recurse into dirs + don't use the standard ignore rules
		if ($lastExitCode -ne "0") { throw "'git clean -fdx' failed" }

		& git -C "$Folder" submodule foreach --recursive git clean -fdx 
		if ($lastExitCode -ne "0") { throw "'git clean -fdx' in submodules failed" }
	}

	[int]$Elapsed = $StopWatch.Elapsed.TotalSeconds
	"✔️ cleaned $($Folders.Count) Git repositories at 📂$ParentDirName in $Elapsed sec."

	exit 0
} catch {
	write-error "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}