<#
.SYNOPSIS
	check-symlinks.ps1 [<DirTree>]
.DESCRIPTION
	Checks every symlink in a directory tree
.EXAMPLE
	PS> .\check-symlinks.ps1 C:\MyApp
.LINK
	https://github.com/fleschutz/PowerShell
.NOTES
	Author: Markus Fleschutz · License: CC0
#>

param([string]$DirTree = "")

try {
	if ($DirTree -eq "" ) { $DirTree = read-host "Enter the path to the directory tree" }

	write-progress "Checking symlinks in $DirTree..."
	[int]$NumTotal = [int]$NumBroken = 0
	Get-ChildItem $DirTree -recurse  | Where { $_.Attributes -match "ReparsePoint" } | ForEach-Object {
		$Symlink = $_.FullName
		$Target = ($_ | Select-Object -ExpandProperty Target -ErrorAction Ignore)
		if ($Target) {
			$path = $_.FullName + "\..\" + ($_ | Select-Object -ExpandProperty Target)
			$item = Get-Item $path -ErrorAction Ignore
			if (!$item) {
				write-warning "Broken symlink: $Symlink -> $Target"
				$NumBroken++
			}
		}
		$NumTotal++
	}

	"✔️ $NumBroken out of $NumTotal symlinks are broken in 📂$DirTree"
	exit $NumBroken
} catch {
	write-error "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}