Combined git/mercurial powershell prompt (from http://matthewmanela.com/blog/launching-the-tortoisehg-log-more-conveniently-from-the-command-line/)

profile.ps1

if (test-path function:\prompt) {
	$oldPrompt = ls function: | ? {$_.Name -eq "prompt"}
	remove-item -force function:\prompt
}
function prompt {
	$color = "Green"
	$markers = "DarkGreen"
	$important = "Red"

	function outputNormal([string]$message)
	{
		Write-Host ($message) -NoNewLine -ForegroundColor $color
	}

	function outputMarker([string]$message)
	{
		Write-Host ($message) -NoNewLine -ForegroundColor $markers
	}

	function outputImportant([string]$message)
	{
		Write-Host ($message) -NoNewLine -ForegroundColor $important
	}

	function writeGitStatus {
		$branch = git branch -v -v --color=never 2>&1
		if ($branch.Exception -ne $null) {
			return $false
		}

		outputMarker " ("
		$branch | foreach {
			if ($_ -match "^\*\s*([^ ]*)\s*") {
				$branch = $matches[1].trim()
				outputNormal $branch
			}
			if ($_ -match "ahead ([0-9]+)") {
				outputImportant ("+" + $matches[1])
			}
			if ($_ -match "behind ([0-9]+)") {
				outputImportant ("-" + $matches[1])
			}
		}

		$untracked = 0
		$updates = 0
		$deletes = 0

		$addsIndex = 0
		$deletesIndex = 0
		$updatesIndex = 0
		$renamesIndex = 0

		git status --porcelain | foreach {
			if ($_ -match "^([\w?]|\s)([\w?])?\s*") {
				switch ($matches[1]) {
					"A" { $addsIndex++ }
					"M" { $updatesIndex++ }
					"D" { $deletesIndex++ }
					"R" { $renamesIndex++ }
					"?" { $untracked++ }
				}
				switch ($matches[2]) {
					"M" { $updates++ }
					"D" { $deletes++ }
				}
			}
		}

		# Treat renames as modifications
		$updatesIndex += $renamesIndex

		if ($addsIndex -gt 0) {
			outputNormal " a:$addsIndex"
		}

		if (($updates + $updatesIndex) -gt 0) {
			outputNormal " m:$updatesIndex"
			if ($updates -gt 0) {
				outputNormal "/$updates"
			}
		}

		if (($deletes + $deletesIndex) -gt 0) {
			outputNormal " d:$deletesIndex"
			if ($deletes -gt 0) {
				outputNormal "/$deletes"
			}
		}

		if ($untracked -gt 0) {
			outputNormal " ?:$untracked"
		}

		outputMarker ")"
		return $true
	}

	function writeHgStatus {
		$summary = hg summary 2>&1
		if ($summary.Exception -eq $null) {
			$regex = "(?si)(parent:(?<parent>.*?)(\n|\r)+.*?)(branch:(?<branch>.*)\s)(commit:(?<commit>.*)\s)(update:(?<update>.*))";
			$summary = [System.String]::Join([System.Environment]::NewLine,$summary)
			$res = $summary -match $regex
			$status = "hg {0} c:{1}" -f $matches["branch"].Trim(), $matches["commit"].Trim()
			outputNormal $status
			return $true
		}
		else {
			return $false
		}
	}

	& $oldPrompt
	writeGitStatus
	writeHgStatus
	return " "
}