Generates Github compare links between two given tags of a silverstripe module

cow-compare.php

#!/usr/bin/env php
<?php
$path = isset($argv[1]) ? $argv[1] : './';

$isMinor = isset($argv[2]) && $argv[2] === '-m';

$path = rtrim($path, '/') . '/';

$lockFile = $path . 'composer.lock';
if (!file_exists($lockFile)) {
    echo 'Could not find "'.$path . 'composer.lock". Please specify the correct path as an argument' . PHP_EOL;
    exit;
}

$lock = json_decode(file_get_contents($lockFile), true);
$cowpat = json_decode(file_get_contents($path.'.cow.pat.json'), true);

foreach ($lock['packages'] as $package) {
    if (substr($package['type'], 0, 12) !== 'silverstripe') {
        continue;
    }

    $truncateName = strlen($package['name']) > 40 ? substr($package['name'], 0, 37) . '...' : $package['name'];

    echo substr($truncateName, 0, 40) . ': ' . str_repeat("\t", 1 + ceil((38 - strlen($truncateName)) / 8));
    $repo = resolveRepo($package);
    if (!$repo) {
        echo 'Could not determine repo...' . PHP_EOL;
        continue;
    }

    $pat = matchPat($cowpat, $package['name']);
    if (!$pat) {
        echo 'Could not find entry in .cow.pat' . PHP_EOL;
        continue;
    }

    $version = $pat['PriorVersion'] ?: $pat['Version'];
    $end = substr($version, strripos($version, '.') + 1);
    if (is_numeric($end) && ($end = (int) $end) > 0) {
        $end--;
        $version = substr($version, 0, strripos($version, '.') + 1).$end;
    }
    $compareVersion = substr($version, 0, strripos($version, '.'));
    if (!$isMinor) {
        $compareVersion = substr($compareVersion, 0, strripos($compareVersion, '.'));
    }

    echo $repo . '/compare/'.$version.'...'.$compareVersion.PHP_EOL;
}



function resolveRepo($package) {
    if (isset($package['source']) && isset($package['source']['type']) && $package['source']['type'] === 'git') {
        return substr($package['source']['url'], 0, -4);
    }
    return null;
}

function matchPat($pat, $search) {
    foreach ($pat as $candidate => $data) {
        if ($candidate === $search) {
            return $data;
        }
        if (isset($data['Items'])) {
            if ($result = matchPat($data['Items'], $search)) {
                return $result;
            }
        }
    }
    return null;
}