Deletes all branches in a git repo of which the last commit is not authored by Morris

delete-all-foreign-branches.php

<?php

$branchesOutput = shell_exec('git branch | egrep -v "^\\*"');
$branches = explode("\n", $branchesOutput);

foreach ($branches as $branch) {
  $branch = trim($branch);
  if ($branch === '') {
    continue;
  }

  $output = shell_exec("git show $branch | head -n 2 | grep 'Author:' | grep -v Morris -q && git branch -D $branch");

  if (!empty($output)) {
    echo $output;
  }
}