gulpfile.js

var fs      = require('fs'),
  gulp      = require('gulp'),
  karma     = require('gulp-karma'),
  rimraf    = require('gulp-rimraf'),
  concat    = require('gulp-concat-util'),
  uglify    = require('gulp-uglify'),
  rename    = require('gulp-rename'),
  size      = require('gulp-size'),
  gutil     = require('gulp-util'),
  formatter = require('gulp-esformatter');

var files = {

  // all files for executing tests
  test: [
    'tests/**/*.js'
  ],

  // all files for client build
  output: [
    'lib/Wikid.js',
    'lib/TokenKinds.js',
    'lib/Token.js',
    'lib/TokenIterator.js',
    'lib/Tokenizer.js',
    'lib/AST.js',
    'lib/Parser.js'
  ]
};

// clean
gulp.task('clean', function (cb) {
  rimraf('./dist', cb);
});

// test
gulp.task('test', function () {
  return gulp.src(files.output.concat(files.test))
    .pipe(karma({ configFile: 'karma.conf.js' }))
    .on('error', gutil.log);
});

// output files
gulp.task('output', function () {
  return gulp.src(files.output)
    .pipe(concat('Wikid.js', { process: normalizeFiles }))
    .pipe(concat.header(fs.readFileSync('./build/header')))
    .pipe(concat.footer(fs.readFileSync('./build/footer')))
    .pipe(formatter({ indent: { value: '  ' } }))
    .pipe(size())
    .pipe(gulp.dest('./dist/'))
    .pipe(uglify())
    .pipe(rename('Wikid.min.js'))
    .pipe(size())
    .pipe(gulp.dest('./dist/'))
    .on('error', gutil.log);
});


gulp.task('build', [
  'clean',
  'output'
]);


gulp.task('default', [
  'clean',
  'test',
  'output'
]);

/**
 * Trims the files and removes 'use strict' statements.
 */
function normalizeFiles(src) {

  //trim the file
  src = src.trim() + '\n';

  //remove duplicate 'use strict' statements
  return src.replace(/(^|\n)[ \t]*('use strict'|"use strict");?\s*/g, '$1');
}