Prune local branches that do not exist on the remote anymore.

git-prune.sh

#!/bin/bash

function gprune() {
  for branch in $(git branch --no-color --list --format='%(refname:short)'); do
    # Keep branch if it exists on remote or if it's the current.
    if git show-branch remotes/origin/$branch >/dev/null 2>&1 || [[ $(git branch --show-current) = $branch ]]; then
      echo "✅ $branch";
    else
      git branch -D $branch > /dev/null && echo "❌ $branch";
    fi
  done
}