A PowerShell script to do a git fetch with a prune then also delete any local branches of the same name

Remove-DeletedGitBranches.ps1

# To set as Git Alias
# git config --global alias.tidy "!pwsh -command C:\MyFolder\Remove-DeletedGitBranches.ps1"
param
(
	[Parameter()]
	[Switch]
    $Force
)

Write-Host "Getting list of branches"
$output = [string] (& git.exe branch 2>&1)
$mainbranch = "main"
if ($output.Contains("master")) 
{
	$mainbranch = "master"
}
Write-Host "Trunk branch is $mainbranch"
    
git checkout $mainbranch
$null = (git fetch --all --prune);
$branches = git branch -vv | Select-String -Pattern ": gone]" | ForEach-Object { $_.toString().Split(" ")[2] };
if($Force)
{
        Write-Host "Deleting all removed branched"
	$branches | ForEach-Object {git branch -D $_};
} else {        
        Write-Host "Deleting removed branched if committed"
	$branches | ForEach-Object {git branch -d $_};        
}
Write-Host "Fetching changes"
git fetch

To make this a git alias use the command

git config --global alias.tidy "!pwsh -command C:\MyFolder\Remove-DeletedGitBranches.ps1"