Cleaning up local GIT branches with PowerShell

GitPruneBranches.ps1

function GitPruneBranches {
    param(
        [string[]] $Exclude,
        [switch] $Unmerged,
        [switch] $Commit
    )

    $pattern = '^\s*(?!(master|main|develop|\*).*$).*'
    if ($Exclude -and $Exclude.Count -gt 0) {
        $pattern = '^(?!(master|main|develop|\*|' + (($Exclude -Join '|') -Replace '\*', '.*') + ').*$).*'
    }

    if ($Unmerged) {
        $branches = git branch
    } else {
        $branches = git branch --merged
    }
    $set = New-Object System.Collections.Generic.HashSet[string]

    $branches | ForEach-Object {
        $branch = $_.Trim()
        if ($branch -match $pattern) {
            $set.Add($branch) | Out-Null
        }
    }
    
    if ($set.Count -gt 0) {
        if (!$commit) {
            $set | ForEach-Object { Write-Host "Will delete branch $_" }
            Write-Host "Will delete $($set.Count) branch(es)"
        } else {
            $set | ForEach-Object {
                git branch -D $_
            }
            Write-Host "Deleted $($set.Count) branch(es)"
        }
    } else {
        Write-Host "No branches match the deletion pattern"
    }
}
Set-Alias -Name prn -Value GitPruneBranches

I use this nifty little function periodically to clean up my local branches. It is safe-by-default, and doesn't perform any deletion unless you pass the -commit flag.

I also like shorthand commands, so in this case, prn (prune).

Examples:

prn
prn -exclude <pattern>
prn -commit

With the -unmerged flag, it will consider unmerged branches (most likely dangerous). It will also filter out the master, main, develop* branches.