gulpfile.js

var gulp = require('gulp');
var fs   = require('fs-extra');

gulp.task('clean', function (done) {
    fs.remove(__dirname + '/autoprefixer.js', function () {
        fs.remove(__dirname + '/build', done);
    });
});

gulp.task('build:lib', ['clean'], function () {
    var coffee = require('gulp-coffee');

    return gulp.src(['{lib,data}/**/*.coffee'])
        .pipe(coffee())
        .pipe(gulp.dest('build/'));
});

gulp.task('build:docs', ['clean'], function () {
    var ignore = require('fs').readFileSync('.npmignore').toString()
        .trim().split(/\n+/)
        .concat(['.npmignore', 'index.js', 'package.json'])
        .map(function (i) { return '!' + i; });

    return gulp.src(['*'].concat(ignore))
        .pipe(gulp.dest('build'));
});

gulp.task('build:package', ['clean'], function () {
    var editor = require('gulp-json-editor');

    return gulp.src('./package.json')
        .pipe(editor(function (json) {
            json.main = 'lib/autoprefixer';
            json.devDependencies['coffee-script'] =
                json.dependencies['coffee-script'];
            delete json.dependencies['coffee-script'];
            return json;
        }))
        .pipe(gulp.dest('build'));
});

gulp.task('build', ['build:lib', 'build:docs', 'build:package']);

gulp.task('standalone', ['build:lib'], function (done) {
    var builder    = require('browserify')({
        basedir:     __dirname + '/build/',
        standalone: 'autoprefixer'
    });
    builder.add('./lib/autoprefixer.js');

    var output = fs.createWriteStream(__dirname + '/autoprefixer.js');
    builder.bundle(function (error, build) {
        if ( error ) {
            process.stderr.write(error.toString() + "\n");
            process.exit(1);
        }

        build = build.toString().replace(
            /DP\$0\([^\s]+, "prototype", \{[^{]+\}\);/g, 'try{$&}catch(e){}');

        fs.removeSync(__dirname + '/build/');

        var rails = __dirname + '/../autoprefixer-rails/vendor/autoprefixer.js';
        if ( fs.existsSync(rails) ) {
            fs.writeFileSync(rails, build);
        } else {
            fs.writeFileSync(__dirname + '/autoprefixer.js', build);
        }
        done();
    });
});

gulp.task('lint', function () {
    var jshint = require('gulp-jshint');

    return gulp.src(['index.js', 'gulpfile.js'])
        .pipe(jshint())
        .pipe(jshint.reporter('jshint-stylish'))
        .pipe(jshint.reporter('fail'));
});

gulp.task('test', function () {
    require('coffee-script').register();
    require('should');

    var mocha = require('gulp-mocha');
    return gulp.src('test/*.coffee', { read: false }).pipe(mocha());
});

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