Composer -> GitHub compare

composer-github-compare.php

#!/usr/bin/env php
<?php
#vim: set ft=php:

$input = '';
while (( ! feof(STDIN))) {
  $input = $input . fgets(STDIN);
}

$patterns = [
  <<<EOD
Removing.*\((?<from>.*?)\)$
.*
Installing\s+(?<package>[^\s]+).*\((?<to>.*?)\)$
EOD
  ,
  <<<EOD
Updating\s+(?<package>[^\s]+).*\((?<from>.*?)\s*=>\s*(?<to>.*?)\)$
EOD
];

$updates = [];
$paragraphs = preg_split('#(\r\n|\r|\n){2,}#', $input);
foreach ($paragraphs as $paragraph) {
  foreach ($patterns as $pattern) {
    if (preg_match("#{$pattern}#xms", $paragraph, $captures)) {
      $updates[] = array($captures['package'], $captures['from'], $captures['to']);
    }
  }
}

foreach ($updates as list ($package, $from, $to)) {

  $packagist = file_get_contents("https://packagist.org/packages/{$package}.json");
  $json = json_decode($packagist, true);

  $repository = $json['package']['repository'];
  $repository = preg_replace('#^\w+://#', 'http://', $repository);
  $repository = rtrim($repository, '/');
  $repository = preg_replace('#\.git$#', '', $repository);

  foreach (array(&$from, &$to) as &$version) {
    $version = preg_split('#\s+#', $version);
    $version = end($version);
  }

  print $repository . '/compare/' . $from . '...' . $to . PHP_EOL . PHP_EOL;
}