Easily compile your javascript files via node.js on the command line

minify.js

// Minify and compile your javascript via node.js on the command line
//
// Usage:
// node minify.js "my_script.js"

var script      = process.argv[2],
    http        = require("http"),
    queryString = require("querystring"),
    fs          = require("fs");

if (!script) {
  throw "No script url given";
}

function post(code, callback) {
  var postData = queryString.stringify({
    compilation_level:  "SIMPLE_OPTIMIZATIONS",
    output_format:      "text",
    output_info:        "compiled_code",
    warning_level:      "QUIET",
    js_code:            code
  });

  var postOptions = {
    host: "closure-compiler.appspot.com",
    port: "80",
    path: "/compile",
    method: "POST",
    headers: {
      "Content-Type":   "application/x-www-form-urlencoded",
      "Content-Length": postData.length
    }
  };
  
  var request = http.request(postOptions, function(response) {
    var responseText = [];
    response.setEncoding("utf8");
    response.on("data", function(data) {
      responseText.push(data);
    });
    response.on("end", function() {
      callback(responseText.join(""));
    });
  });
  
  // Post the data
  request.write(postData);
  request.end();
}

function readFile(filePath, callback) {
  fs.readFile(filePath, "utf-8", function (err, data) {
    if (data) {
      callback(data);
    } else {
      console.log("The script is empty?!");
      process.exit(-1);
    }
  });
}

function writeFile(filePath, data, callback) {
  fs.writeFile(filePath, data, "utf-8", callback);
}


console.log("Reading file ...");
readFile(script, function(code) {
  console.log("Contacting Google Closure Compiler API ...");
  post(code, function(code) {
    console.log("Writing file ...");
    var output = script.replace(/\.js/, ".min.js");
    writeFile(output, code, function() {
      console.log("Done. Your minified script can be found here: " + output);
    });
  });
});