The Git-CompareBranchesMerged Cmdlet

example.sh

# Assume we have a QA branch and a master (production) branch. 
# The following feature branches have been merged with QA:      A, B, C, D, E, F
# The following feature branches have been merged with master:  A, B, C

PS> gcbm QA master
Listing branches in QA which are not in master
->  D
->  E
->  F
PS>

git-comparebranchesmerged.ps1

function Git-CompareBranchesMerged {
	if ($args.Count -ne 2) {
		"Usage: Git-CompareBranchesMerged branch1 branch2"
		"This will list branches merged into branch1 which are not in branch2"
		return
	}
	"Listing branches in $($args[0]) which are not in $($args[1])"
	$merged1 = git branch -a --merged $args[0] | foreach { $_ -replace "remotes/origin/" -replace " " } | sort | unique
	$merged2 = git branch -a --merged $args[1] | foreach { $_ -replace "remotes/origin/" -replace " " } | sort | unique
	$currentColor = $Host.UI.RawUI.ForegroundColor
	$Host.UI.RawUI.ForegroundColor = [System.ConsoleColor]"Red"
	$branch1 = $args[0]
	$merged1 | foreach {
		$line1 = $_
		$found = [Boolean]($merged2 | where { $_ -eq $line1 })
		if (-not $found -and $line1 -replace " " -ne $branch1) {
			$line1 = $line1 -replace "remotes/origin/"
			"->  $line1"
		}
	}
	$Host.UI.RawUI.ForegroundColor = $currentColor
}
Set-Alias gcbm Git-CompareBranchesMerged