HTML5 Cache Manifest Builder

build-manifest.php

<?php
  /*!
   * HTML5 Cache Manifest Builder
   * @author Shen Junru
   *
   * in Command Line:
   *   - remote=path (ex://domain/path/)
   *   - path/type=remote (ex: ../js/*.js=/js)
   * in Browser:
   *   - remote=path (ex://domain/path/)
   *   - caches=path/type=remote[, ...] (ex: ../js/*.js=/js,../css/*.css)
   */

  /**
   * separates a string to ($key, $val) by a separator string
   *
   * @param string $string - string to be separated
   * @param string $separator - separator string
   * @param string &$key - result: $key
   * @param string &$val - result: $val
   * @param bool   [$keep=false] - true as keeps the separator on the key side
   */
  function separate($string, $separator, &$key='', &$val='', $keep=FALSE){
    $pos=(int)strpos($string, $separator);
    $pos=0<$pos?$pos:strlen($string);
    $key=substr($string, 0, $keep?$pos+1:$pos);
    $val=substr($string, $pos+1);
  }

  /**
   * parses a parameter string to ($path, $type, $remote)
   *
   * @param string $param - string to be parsed
   * @param string &$path - result: $path
   * @param string &$type - result: $type
   * @param string &$remote - result: $remote
   */
  function parseParam($param, &$path='', &$type='', &$remote=''){
    separate($param, '=', $path, $remote);
    separate($path, '/', $path, $type, TRUE);
  }

  /**
   * recursive finds files in the directory
   *
   * @param string &$caches - result: $caches matched files paths
   * @param string &$hashes - result: $hashes md5 hashes
   * @param string $path - directory path
   * @param string $type - file type
   * @param string $remote - remote path prefix
   */
  function findFiles(&$caches, &$hashes, $path, $type='*.*', $remote='', /*internals*/$local='', $self=FALSE){
    // remote path prefix
    $remote=dirname((empty($remote)?$path:$remote).'/#').'/';
    // directory path
    $path=realpath(($self?'':__DIR__)."/$path");
    // local path prefix
    $local=dirname((empty($local)?$path:$local).'/#');

    // finds files in this directory
    $files=glob("$path/$type");
    if (!empty($files)) {
      $caches.=str_replace($local.'/', $remote, join("\n", $files))."\n";
      foreach ($files as $file) {
        $hashes.=md5_file($file);
      }
    }

    // recursive subdirectories
    $dirs=glob("$path/*/");
    if (FALSE !== $dirs) {
      foreach ($dirs as $dir) {
        findFiles($caches, $hashes, $dir, $type, $remote, $local, TRUE);
      }
    }
  }

  // parses parameters
  $params=array();
  $_remote='';
  if (isset($argv)) {
    // in Command Line
    array_shift($argv);
    foreach ($argv as $i=>$param) {
      if ('remote=' === substr($param, 0, 7)) {
        $_remote=substr($param, 7);
      } else {
        $params[]=$param;
      }
    }
  } else if (isset($_GET)) {
    // in Browser
    if (isset($_GET['remote'])) {
      $_remote=$_GET['remote'];
    }
    if (isset($_GET['caches'])) {
      $params=explode(',', $_GET['caches']);
    }
  }

  $caches='';
  $hashes='';
  foreach ($params as $param) {
    parseParam($param, $path, $type, $remote);
    findFiles($caches, $hashes, $path, $type, empty($remote)?$_remote:$remote);
  }

  $output='CACHE MANIFEST';
  $output.="\nNETWORK:\n";
  $output.="*\n";
  $output.="\nCACHE:\n";
  $output.=$caches;
  $output.="#".md5($hashes)."\n";

  if (!isset($argv)) {
    header('Content-Type:text/plain');
  }
  echo($output);