<#
.SYNOPSIS
	clean-repo.ps1 [<repo-dir>]
.DESCRIPTION
	Cleans a Git repository from untracked files (including submodules, e.g. for a fresh build).
.EXAMPLE
	PS> .\clean-repo.ps1 C:\MyRepo
.NOTES
	Author: Markus Fleschutz · License: CC0
.LINK
	https://github.com/fleschutz/PowerShell
#>

param([string]$RepoDir = "$PWD")

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

	if (-not(test-path "$RepoDir" -pathType container)) { throw "Can't access directory: $RepoDir" }
	$RepoDirName = (get-item "$RepoDir").Name

	"🧹 Cleaning Git repository 📂$RepoDirName from untracked files..."

	$Null = (git --version)
	if ($lastExitCode -ne "0") { throw "Can't execute 'git' - make sure Git is installed and available" }
	
	& git -C "$RepoDir" clean -xfd -f # force + recurse into dirs + don't use the standard ignore rules
	if ($lastExitCode -ne "0") { throw "'git clean -xfd -f' failed" }

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

	[int]$Elapsed = $StopWatch.Elapsed.TotalSeconds
	"✔️ cleaned Git repository 📂$RepoDirName in $Elapsed sec"
	exit 0
} catch {
	write-error "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}