Move mkdir -p functionality to its own module and cleanup --output build tests.

Former-commit-id: b7ea2a41c60357e780e10bd3d665db3d50e7f044

build/minify.js

@@ -2,18 +2,19 @@
 ;(function() {
   'use strict';
 
-  /** Load modules */
+  /** Load Node.js modules */
   var fs = require('fs'),
       https = require('https'),
       path = require('path'),
       spawn = require('child_process').spawn,
-      zlib = require('zlib'),
-      tar = require('../vendor/tar/tar.js'),
-      _ = require('../lodash.js');
+      zlib = require('zlib');
 
   /** Load other modules */
-  var preprocess = require('./pre-compile.js'),
-      postprocess = require('./post-compile.js');
+  var _ = require('../lodash.js'),
+      mkdirpSync = require('./mkdirp-sync.js'),
+      preprocess = require('./pre-compile.js'),
+      postprocess = require('./post-compile.js'),
+      tar = require('../vendor/tar/tar.js');
 
   /** The Git object ID of `closure-compiler.tar.gz` */
   var closureId = '23cf67d0f0b979d97631fc108a2a43bb82225994';
@@ -141,7 +142,9 @@
       outputPath = options.reduce(function(result, value, index) {
         if (/-o|--output/.test(value)) {
           result = options[index + 1];
-          result = path.join(fs.realpathSync(path.dirname(result)), path.basename(result));
+          var dirname = path.dirname(result);
+          mkdirpSync(dirname);
+          result = path.join(fs.realpathSync(dirname), path.basename(result));
         }
         return result;
       }, outputPath);

build/mkdirp-sync.js

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+;(function() {
+  'use strict';
+
+  /** Load Node.js modules */
+  var fs = require('fs'),
+      path = require('path');
+
+  /**
+   * Makes the given `path` directory, without throwing errors for existing
+   * directories and making parent directories as needed.
+   *
+   * @param {String} dirname The path of the directory.
+   * @param {Number|String} mode The permission mode.
+   */
+  function mkdirpSync(dirname, mode) {
+    var separator = path.sep,
+        segments = dirname.split(separator),
+        type = typeof mode;
+
+    if (!(type == 'number' || type == 'string')) {
+      mode = '0777';
+    }
+    segments.reduce(function(currPath, segment, index) {
+      // skip leading separator of absolute paths
+      if (index === 0 && currPath === '') {
+        return separator;
+      }
+      segment = currPath + (currPath === separator ? segment : separator + segment);
+      try {
+        segment = fs.realpathSync(segment);
+      } catch(e) {
+        fs.mkdirSync(segment, mode);
+      }
+      return segment;
+    });
+  }
+
+  // expose
+  module.exports = mkdirpSync;
+}());