Git clean merged branches locally and optionally remote

git-clean-merged.php

#!/usr/bin/env php
<?php

/**
 * Git cleanup script: deletes merged branches locally (and optionally on remote).
 *
 * Usage:
 *   php git-clean-merged.php [--with-remote] [--help]
 *
 * Options:
 *   --with-remote   Also delete branches on origin
 *   --help          Show this help message
 *
 * Default behavior is to delete only local merged branches.
 */

// Parse command-line options
$options = getopt('', ['with-remote', 'help']);

if (isset($options['help'])) {
    echo <<<EOT
Usage: php git-clean-merged.php [options]

Options:
  --with-remote   Also delete branches on the remote (origin)
  --help          Show this help text

This script removes all local branches that have been merged into the default branch.
Use --with-remote to also delete them from the remote repository (origin).
After cleanup, it switches back to the branch you started from.

EOT;
    exit(0);
}

// Check if we're in a Git repository
if (!is_dir('.git') && shell_exec('git rev-parse --git-dir 2>/dev/null') === null) {
    echo "Error: Not inside a Git repository.\n";
    exit(1);
}

// Save current branch
$currentBranch = trim(shell_exec("git rev-parse --abbrev-ref HEAD"));
if (!$currentBranch) {
    echo "Error: Unable to determine current branch.\n";
    exit(1);
}

// Determine default (base) branch
$rawBaseBranch = shell_exec("git symbolic-ref refs/remotes/origin/HEAD 2>&1");
if (!$rawBaseBranch) {
    echo "Error: Failed to determine the base branch. Make sure origin/HEAD is set.\n";
    exit(1);
}
$baseBranch = trim(str_replace('refs/remotes/origin/', '', $rawBaseBranch));
echo "Default branch detected: $baseBranch\n";

// Switch to base branch
echo "Switching to $baseBranch...\n";
shell_exec("git checkout $baseBranch 2>&1");

// Fetch and prune remote branches
echo "Running git fetch --prune...\n";
shell_exec("git fetch --prune 2>&1");

// Find merged local branches
echo "Finding merged local branches...\n";
$mergedBranches = shell_exec("git branch --merged");

if (!$mergedBranches) {
    echo "No merged branches found or an error occurred.\n";
    shell_exec("git checkout $currentBranch 2>&1");
    exit(1);
}

foreach (explode("\n", trim($mergedBranches)) as $branchLine) {
    $branchLine = trim($branchLine);
    if ($branchLine === '') continue;

    if (strpos($branchLine, '*') === 0) {
        $branchLine = ltrim($branchLine, '* ');
    }

    if ($branchLine === $baseBranch) continue;

    echo "Deleting local branch '$branchLine'...\n";
    shell_exec("git branch -d $branchLine 2>&1");

    if (isset($options['with-remote'])) {
        echo "Deleting remote branch '$branchLine' from origin...\n";
        shell_exec("git push origin --delete $branchLine 2>&1");
    }
}

// Switch back to original branch
if ($currentBranch !== $baseBranch) {
    echo "Returning to original branch '$currentBranch'...\n";
    shell_exec("git checkout $currentBranch 2>&1");
}

echo "Cleanup complete.\n";