gulpfile.js

var args            = require('yargs').argv;
var autoprefixer    = require('gulp-autoprefixer');
var babel           = require('gulp-babel');
var bump            = require('gulp-bump');
var checktextdomain = require('gulp-checktextdomain');
var concat          = require('gulp-concat');
var cssnano         = require('gulp-cssnano');
var gulp            = require('gulp');
var gulpif          = require('gulp-if');
var jshint          = require('gulp-jshint');
var mergeStream     = require('merge-stream');
var potomo          = require('gulp-potomo');
var pottopo         = require('gulp-pottopo');
var pump            = require('pump');
var sass            = require('gulp-sass');
var sort            = require('gulp-sort');
var terser          = require('gulp-terser');
var wpPot           = require('gulp-wp-pot');
var yaml            = require('yamljs');

var config = yaml.load('+/config.yml');

gulp.task('bump', function(cb) {
  var type = 'patch';
  ['prerelease','patch','minor','major'].some(function(arg) {
    if( !args[arg] )return;
    type = arg;
    return true;
  });
  pump([
    gulp.src(config.bump),
    bump({type:type,keys:['stable tag','version']}),
    gulp.dest('.'),
  ], cb);
});

gulp.task('css', function(cb) {
  var streams = mergeStream();
  for(var key in config.styles) {
    if(!config.styles.hasOwnProperty(key))continue;
    streams.add(gulp.src(config.styles[key]).pipe(concat(key)));
  }
  pump([
    streams,
    gulpif(args.production, cssnano()),
    gulp.dest(config.dest.css),
  ], cb);
});

gulp.task('js', function(cb) {
  var streams = mergeStream();
  for(var key in config.scripts) {
    if(!config.scripts.hasOwnProperty(key))continue;
    streams.add(gulp.src(config.scripts[key]).pipe(concat(key)));
  }
  pump([
    streams,
    // babel({
    //   compact: false,
    //   presets: ['@babel/preset-env'],
    // }),
    gulpif(args.production, terser({
      output: {comments: 'some'},
    })),
    gulp.dest(config.dest.js),
  ], cb);
});

gulp.task('jshint', function(cb) {
  pump([
    gulp.src(config.watch.js),
    jshint(),
    jshint.reporter('jshint-stylish'),
    jshint.reporter('fail'),
  ], cb);
});

gulp.task('po-to-mo', function(cb) {
  pump([
    gulp.src(config.dest.lang + '*.po'),
    potomo(),
    gulp.dest(config.dest.lang),
  ], cb);
});

gulp.task('pot', function(cb) {
  pump([
    gulp.src(config.watch.php),
    checktextdomain({
      text_domain: config.language.domain,
      keywords: [
        '__:1,2d',
        '_e:1,2d',
        '_x:1,2c,3d',
        'esc_html__:1,2d',
        'esc_html_e:1,2d',
        'esc_html_x:1,2c,3d',
        'esc_attr__:1,2d',
        'esc_attr_e:1,2d',
        'esc_attr_x:1,2c,3d',
        '_ex:1,2c,3d',
        '_n:1,2,4d',
        '_nx:1,2,4c,5d',
        '_n_noop:1,2,3d',
        '_nx_noop:1,2,3c,4d',
      ],
    }),
    sort(),
    wpPot({
      domain: config.language.domain,
      lastTranslator: config.language.translator,
      team: config.language.team,
    }),
    gulp.dest(config.dest.lang + config.language.domain + '.pot'),
  ], cb);
});

gulp.task('pot-to-po', function(cb) {
  pump([
    gulp.src(config.dest.lang + '*.pot'),
    pottopo(),
    gulp.dest(config.dest.lang),
  ], cb);
});

gulp.task('scss', function(cb) {
  pump([
    gulp.src(config.watch.scss),
    sass({
      outputStyle: 'expanded',
    }).on('error', sass.logError),
    autoprefixer('last 2 versions'),
    gulpif(args.production, cssnano({
      minifyFontValues: false,
      discardComments: {removeAll: true},
      zindex: false,
    })),
    gulp.dest(config.dest.css),
  ], cb);
});

gulp.task('watch', function() {
  gulp.watch(config.watch.css, gulp.parallel('css'));
  gulp.watch(config.watch.js, gulp.parallel('jshint', 'js'));
  gulp.watch(config.watch.scss, gulp.parallel('scss'));
});

gulp.task('languages', gulp.series('pot', 'pot-to-po', 'po-to-mo'));
gulp.task('default', gulp.parallel('css', 'js', 'jshint', 'scss'));
gulp.task('build', gulp.parallel('default', 'languages'));