list-latest-tag.ps1

<#
.SYNOPSIS
	Lists the latest tag on the current branch in a Git repository
.DESCRIPTION
	This PowerShell script lists the latest tag on the current branch in a Git repository.
.PARAMETER RepoDir
	Specifies the path to the repository
.EXAMPLE
	PS> ./list-latest-tag.ps1 C:\MyRepo
	🔖v0.8 at commit 02171a401d83b01a0cda0af426840b605e617f08
.LINK
	https://github.com/fleschutz/PowerShell
.NOTES
	Author: Markus Fleschutz | License: CC0
#>

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

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

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

	$LatestTagCommitID = (git -C "$RepoDir" rev-list --tags --max-count=1)
	$LatestTag = (git -C "$RepoDir" describe --tags $LatestTagCommitID)
	"🔖$LatestTag at commit $LatestTagCommitID"
	exit 0 # success
} catch {
	"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}