jscover.js

/*!
 * jscover - lib/jscover.js
 * Copyright(c) 2012 fengmk2 <fengmk2@gmail.com>
 * MIT Licensed
 */

"use strict";

/**
 * Module dependencies.
 */

var exec = require('child_process').exec;
var path = require('path');
var ndir = require('ndir');
var fs = require('fs');

var root = path.dirname(__dirname);
var JSCoverPath = path.join(root, 'bin', 'JSCover-all.jar');
var JSCoverCommand = 'java -Dfile.encoding=UTF-8 -jar ' + JSCoverPath + ' -fs';

module.exports = function jscover(source, target, options, callback) {
  options = options || [];
  
  var tmpTarget = path.join(path.dirname(target), '__cov__', path.basename(target));

  var cmd = JSCoverCommand;
  if (options && options.length > 0) {
    cmd += ' ' + options.join(' ');
  }
  cmd += ' --exclude=' + tmpTarget + ' --exclude=' + target;
  cmd += ' ' + source + ' ' + tmpTarget;
  var child = exec(cmd, function (err, stdout, stderr) {
    var output = '';
    if (stdout) {
      output += stdout;
    }
    if (stderr) {
      output += stderr;
      if (!err) {
        err = new Error(stderr);
        err.name = 'JSCoverError';
      }
    }
    if (err) {
      return callback(err, output);
    }

    var success = !stdout && !stderr;
    if (!success) {
      return callback(null, output);
    }
    var jscoverageFiles = path.join(target, 'jscoverage*');
    var mvCommand = 'rm -rf ' + target +
      ' && mv ' + tmpTarget + ' ' + target +
      ' && rm -rf ' + path.dirname(tmpTarget) + ' ' + jscoverageFiles + ' ' + path.join(target, '__cov__');
    exec(mvCommand, function (err) {
      if (err) {
        return callback(err);
      }
      // add pedding scripts
      var pedding = 
"/* automatically generated by jscover - do not edit */\n\
if (typeof _$jscoverage === 'undefined') _$jscoverage = {};\n";
      
      ndir.walk(target, function onDir(dirpath, files) {
        for (var i = 0; i < files.length; i++) {
          var info = files[i];
          if (info[1].isFile()) {
            var filepath = info[0];
            if (path.extname(filepath).toLowerCase() !== '.js') {
              continue;
            }
            var content = fs.readFileSync(filepath, 'utf8');
            fs.writeFileSync(filepath, pedding + content);
          }
        }
      }, function end() {
        callback();
      }, function error(err, errPath) {
        console.error('%s error: %s', errPath, err);
        callback(err);
      });
    });
  });
};