<?php

/**
 * Script for discovering and upgrading all MediaWiki extensions
 * 
 * @author Greg Rundlett greg@eQuality-Tech.com
 * @copyright 2016 
 * @license GPLv3 or later
 *
 * INSTALL
 * Place the script in the installation root of your MediaWiki instance i.e. "$IP"
 *
 * CONFIG
 * The script must be configured to specify which Release you are currently running
 * and the Release you want to upgrade to.
 * 
 * You can also tell it whether you want to run composer with '--no-dev' (default)
 *
 * USAGE
 * This script expects that you are currently using some checkout of a MediaWiki Core release
 * and you want to move from that "old" release to a "new" release.
 *
 * Configure the $oldRelease and $newRelease variables to branch names found in 
 * MediaWiki core and extensions.
 * 
 * php inspect-extensions.php 
 *
 * SIDE-EFFECTS
 * This script will run a git fetch on all your (git-controlled) extensions.
 * 
 * LIMITATIONS
 * This script will pass over any extension that doesn't have a .git folder
 * It assumes that these extensions were 
 *    * installed via Composer (without the --prefer-source option)
 *    * developed locally or from non-git sources
 *    * or downloaded as a package and we don't assume where you want to get it from
 * 
 * This script can and will inadvertently change your checkout for extensions
 * which were installed using Composer and the --prefer-source option. In those
 * cases, redo a manual checkout to the branch that composer wants.
 * 
 * This script runs on GNU/Linux. No attempt has been made to make it XP
 *
 */
 
///////////////////////////////////////////////////////////////////////////////
//                   BEGIN CONFIGURATION                                     //
///////////////////////////////////////////////////////////////////////////////

// set the current and next release to upgrade to.
// it is not recommended to skip releases
$oldRelease = 'REL1_27';
$newRelease = 'REL1_28';

// if true, add composer "require-dev" modules
// if false, 'composer [install|update] --no-dev' will be used
$devMode = false; 

///////////////////////////////////////////////////////////////////////////////
//                  END OF CONFIGURATION                                     //
///////////////////////////////////////////////////////////////////////////////

// Security
// DO NOT ALLOW THIS SCRIPT TO BE CALLED FROM THE WEB !
(PHP_SAPI !== 'cli' || isset($_SERVER['HTTP_USER_AGENT'])) && die('eQuality-Tech.com can upgrade your wiki');


// by default, do not install require-dev modules
$devSwitch = ($devMode) ? "" : ' --no-dev';

$IP = dirname(__FILE__);
//  work within the extensions directory so as not to conflict with the main composer.json
$dir = "$IP/extensions";
if (!is_dir($dir)) {
  die ('This script should be placed in your wiki root, and run from there');
} else {
  // use colors by \033[32m some colored text \033[0m
  echo "Directories marked with \033[35m * \033[0m are git controlled\n";
  echo "and decorated with their current branch matching $oldRelease\n";
}
chdir ($dir);

// https://secure.php.net/manual/en/function.glob.php
// automatically sorted (unless you tell it not to)
// using the "pattern" of $dir . '/*', we get the full path for each extension
// $directories = glob($dir . '/*' , GLOB_ONLYDIR);
// using just '*' for the pattern, we get just the extension folder name
// since we've already changed into the extensions directory
$directories = glob('*' , GLOB_ONLYDIR);
// print_r($directories);
$doUpgrade = true;
$doUpgrade = false;

foreach ($directories as $ext) {
  $hasGit = false;      // detect presence of .git directories
  $hasLock = false;     // detect prior use of 'composer install'
  $gitBranch = '';      // what branch is in use currently
  $hasOldRelease = '';  // is $oldRelease the current branch?
  $upgradable = false;  // does $newRelease exist upstream?
  $hasComposer = false; // does the extension use Composer?
  
  if (is_dir("{$ext}/.git")) {
    $hasGit = true;
  }
  echo ($hasGit)? "\033[36m$ext\033[0m" : "\033[31m$ext\033[0m";
  // we can ONLY operate on an extension directory that is git controlled, 
  // otherwise, all git commands will 'see' the git repo of core
  if ($hasGit) {
    chdir ("$IP/extensions/$ext");
    $gitBranch = `git branch | grep '^*' | awk '{print $2}'`;
    $gitBranch = trim($gitBranch);
    // see if oldRelease is available locally
    $hasOldRelease = `git branch --list $oldRelease | grep '^*' | awk '{print $2}'`;
    $hasOldRelease = trim($hasOldRelease);
    // print the branch in orange (warning) if it doesn't match the expected 'oldRelease'
    echo ($gitBranch == $hasOldRelease) ? " \033[36m$gitBranch\033[0m" : " \033[33m$gitBranch\033[0m";
    // git branch -r doesn't know about remote branches it hasn't fetched yet
    exec('git fetch $1 > /dev/null');
    // add the -r option look at those remote branches
    $upgradable = `git branch -r --list "*$newRelease"`;
    // could be a multi-line string in the case of multiple remotes
    // take off leading whitespace and the last newline, and convert to an array
    $upgradable = trim($upgradable);
    if (strlen($upgradable)) {
      $upgradable = explode("\n", $upgradable);
      if (count($upgradable)) { echo "\033[35m upgradable \033[0m" ; }
      echo implode($upgradable);
      // blindly take the first remote if more than one
      $cmd = "git checkout -b $newRelease {$upgradable[0]}";

      if ($doUpgrade) {
        exec($cmd);
      } else {
        echo " $cmd";
      }
      // see if this extension has it's own composer.json
      $hasComposer = glob('composer.json');
      $hasLock = glob('composer.lock');
      $cmd = ($hasLock)? "composer update $devSwitch" : "composer install $devSwitch";
      if ($doUpgrade && $hasComposer) {
        exec($cmd);
      } elseif ($hasComposer) {
        echo " && $cmd";
      } 
    }
  }
  chdir ("$IP/extensions");
  echo "\n";
}