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

Former-commit-id: b7ea2a41c60357e780e10bd3d665db3d50e7f044

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;
+}());