Extract the preprocess and postprocess functions into build/pre-compile.js and build/post-compile.js, respectively. Clean up build.js.

Former-commit-id: 18c47305b304cca41f00d994138f5b067def1b07

build/post-compile.js

@@ -0,0 +1,42 @@
+#!/usr/bin/env node
+;(function() {
+  'use strict';
+
+  /* Post-processes a compressed `src` string. */
+  var postprocess = module.exports = function postprocess(src) {
+    /** The minimal license/copyright header */
+    var license =
+      '/*!\n' +
+      ' Lo-Dash @VERSION github.com/bestiejs/lodash/blob/master/LICENSE.txt\n' +
+      ' Underscore.js 1.3.3 github.com/documentcloud/underscore/blob/master/LICENSE\n' +
+      '*/';
+
+    /*--------------------------------------------------------------------------*/
+
+    // set the version
+    license = license.replace('@VERSION', (/VERSION:([\'"])(.*?)\1/).exec(src).pop());
+
+    // move vars exposed by Closure Compiler into the IIFE
+    src = src.replace(/^([^(\n]+)\s*(\(function[^)]+\){)/, '$2$1');
+
+    // use double quotes consistently
+    src = src.replace(/'use strict'/, '"use strict"');
+
+    // add license
+    return license + '\n;' + src;
+  };
+
+  /*--------------------------------------------------------------------------*/
+
+  /** The filesystem module */
+  var fs = require('fs'), src;
+
+  if (module == require.main) {
+    // read the JavaScript source file from the first argument if the script
+    // was invoked directly (i.e., `node post-compile.js source.js`)
+    src = fs.readFileSync(process.argv[2], 'utf8');
+
+    // write to the same file
+    fs.writeFileSync(process.argv[2], postprocess(src), 'utf8');
+  }
+}());