This function allows to delete local branches that have already been merge to (local) main. To ensure that no important branches are deleted, the names are written to a temporary file that can be edited via nvim. The branches remaining in that file are deleted (except for main)

delete-branches.ps1

function delete-branches {
      git switch main
      git branch --merged > tmp.txt
      nvim tmp.txt

      Get-Content tmp.txt | ForEach-Object {
            $to_delete = $_.Trim()
            if ($to_delete -ne "* main" -and $to_delete -ne "main") {
                  echo "Deleting $($to_delete)"
                  git branch -d $to_delete
            }
      }

      git switch -
      rm tmp.txt
}