changelog.php

<?php
/**
 * Changelog Markdown
 *
 * This is a script to transform GIT LOG into a cute format Changelog.md
 *
 * To use, set executable permissions to this file and execute:
 *     $ php changelog.php > CHANGELOG.md
 *
 * Copyright (c) 2013 João Pinto Neto
 * Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
 *
 *
 */
$cmd = 'git log --pretty="%ad: [%an] <%ae> %s" --date="short" --no-merges';
$process = shell_exec($cmd);
$result = array();

foreach (preg_split("/((\r?\n)|(\r\n?))/", $process) as $line) {
    if (preg_match('/(^\d{4}-\d{2}-\d{2})\:\s\[(.*)\]\s(\<.*\>)\s(.*)/', $line, $match)) {
        if (!isset($result[$match[1]])) {
            $result[$match[1]] = array();
        }
        $result[$match[1]][] = $match[4];
    }
}

echo '# Changelog' . PHP_EOL;
foreach ($result as $date => $data) {
    echo '## ' . $date . PHP_EOL;
    foreach ($data as $change) {
        echo '- ' . $change . PHP_EOL;
    }
    echo PHP_EOL;
}