PowerShell Function to clean your local git branches (inspired by https://blogs.blackmarble.co.uk/rfennell/2021/03/16/tidying-up-local-branches-with-a-git-alias-and-a-powershell-script/ )

gitcleanbranches.ps1

function gitcleanbranches {
    [CmdletBinding()]
    [alias('gitcb')]
    param(
        [switch]
        [alias('n')]
        $Notmerged,

        [switch]
        [alias('f')]
        $force
        
    )

    $output = [string] (& git.exe branch 2>&1)
    $mainbranch = "main"
    if ($output.Contains("master")) 
    {
        $mainbranch = "master"
    }
    git checkout $mainbranch
    $null = (git fetch --all --prune);

    if ($notmerged) {
        git for-each-ref --format '%(refname:short)' refs/heads | ForEach-Object { if ($_ -notmatch 'master|main') { 
            if ($force) { git branch $_ -D } 
            else { git branch $_ -d  }
            }
        }
    }
    else {
        git for-each-ref --format '%(refname:short)' refs/heads --merged | ForEach-Object { if ($_ -notmatch 'master|main') { 
            if ($force) { git branch $_ -D } 
            else { git branch $_ -d  }
            }
        }
    }
}