generate Changelog

generateChangelog.php

<?php

$output = "# changelog\n\n";

$previousTag = 0;

$gitTags = shell_exec("git tag --sort=-creatordate");
$gitTagsArray = explode("\n", $gitTags);

foreach ($gitTagsArray as $gitTag) {
    if ($previousTag !== 0 && $gitTag !== '') {
        $tagDate = shell_exec("git log -1 --pretty=format:'%ad' --date=short $previousTag");
        $output .= "## $previousTag ($tagDate)\n\n";
        $cmd = 'git log ' .
            $gitTag . '...' .
            $previousTag .
            ' --no-merges --pretty=format:"*  %s" --reverse';
        $logLine = shell_exec($cmd);
        $logLine = preg_replace('/(?m)(.*)(\R?\n\1)+$/', '$1', $logLine);
        $output .= $logLine . "\n";
    }
    $previousTag = $gitTag;
    $output .= "\n\n";
}

file_put_contents('changelog.md', $output);

👍