<#
.SYNTAX       pull-repos.ps1 [<parent-dir>]
.DESCRIPTION  pulls updates for all Git repositories under the current/given directory (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
	"Pulling updates for $($Folders.Count) Git repositories at 📂$ParentDirName ..."

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

		& git -C "$Folder" pull --recurse-submodules --jobs=4
		if ($lastExitCode -ne "0") {
			write-warning "'git pull' on 📂$FolderName failed"
		}
	}

	[int]$Elapsed = $StopWatch.Elapsed.TotalSeconds
	"✔️ updated $($Folders.Count) Git repositories at 📂$ParentDirName in $Elapsed sec."
	exit 0
} catch {
	write-error "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}