gulpfile.babel.js

import gulp from "gulp";
import cp from "child_process";
import gutil from "gulp-util";
import postcss from "gulp-postcss";
import cssImport from "postcss-import";
import cssnext from "postcss-cssnext";
import BrowserSync from "browser-sync";
import webpack from "webpack";
import webpackConfig from "./webpack.conf";
import svgstore from "gulp-svgstore";
import svgmin from "gulp-svgmin";
import inject from "gulp-inject";
import replace from "gulp-replace";
import cssnano from "cssnano";
import critical from "critical";
import htmlmin from "gulp-htmlmin";
import minifycss from "gulp-minify-css";
import minify from "gulp-minifier";

const browserSync = BrowserSync.create();
const hugoBin = `./bin/hugo.${process.platform === "win32" ? "exe" : process.platform}`;
const defaultArgs = ["-d", "../dist", "-s", "site"];

gulp.task("hugo", (cb) => buildSite(cb));
gulp.task("hugo-preview", (cb) => buildSite(cb, ["--buildDrafts", "--buildFuture"]));

gulp.task("cms", () => {
  const match = process.env.REPOSITORY_URL ? process.env.REPOSITORY_URL : cp.execSync("git remote -v", {encoding: "utf-8"});
  let repo = null;
  match.replace(/github.com:(\S+)(\.git)?/, (_, m) => {
    repo = m.replace(/\.git$/, "");
  });
  gulp.src("./src/cms/*")
    .pipe(replace("<% GITHUB_REPOSITORY %>", repo))
    .pipe(gulp.dest("./dist/admin"))
    .pipe(browserSync.stream());
  gulp.src(["./node_modules/netlify-cms/dist/*.*", "!./node_modules/netlify-cms/dist/*.html"])
    .pipe(gulp.dest("./dist"))
    .pipe(browserSync.stream())
});

gulp.task("build", ["css", "js", "hugo", "cms"]);
gulp.task("build-preview", ["css", "js", "hugo-preview"]);

gulp.task("css", () => (
  gulp.src("./src/css/*.css")
    .pipe(postcss([
      cssImport({from: "./src/css/main.css"}),
      cssnext(),
      cssnano(),
    ]))
    .pipe(minifycss({advanced:false}))
    .pipe(gulp.dest("./dist/css"))
    .pipe(browserSync.stream())
));

gulp.task("js", (cb) => {
  const myConfig = Object.assign({}, webpackConfig);

  webpack(myConfig, (err, stats) => {
    if (err) throw new gutil.PluginError("webpack", err);
    gutil.log("[webpack]", stats.toString({
      colors: true,
      progress: true
    }));
    browserSync.reload();
    cb();
  });
});


gulp.task('critical', ['minify'], function (cb) {
    critical.generate({
        inline: true,
        base: 'dist/',
        src: 'index.html',
        dest: 'index.html',
        width: 320,
        height: 480,
        minify: true
    });
});

gulp.task('minify', ['build'], function() {
  return gulp.src('dist/**/*').pipe(minify({
    minify: true,
    collapseWhitespace: true,
    conservativeCollapse: true,
    minifyJS: true,
    minifyCSS: true,
    getKeptComment: function (content, filePath) {
        var m = content.match(/\/\*![\s\S]*?\*\//img);
        return m && m.join('\n') + '\n' || '';
    }
  })).pipe(gulp.dest('dist'));
});

gulp.task("svg", () => {
  const svgs = gulp
    .src("site/static/img/icons/*.svg")
    .pipe(svgmin())
    .pipe(svgstore({inlineSvg: true}));

  function fileContents(filePath, file) {
    return file.contents.toString();
  }

  return gulp
    .src("site/layouts/partials/svg.html")
    .pipe(inject(svgs, {transform: fileContents}))
    .pipe(gulp.dest("site/layouts/partials/"));
});

gulp.task("server", ["hugo", "css", "js", "svg", "cms"], () => {
  browserSync.init({
    server: {
      baseDir: "./dist"
    }
  });
  gulp.watch("./src/js/**/*.js", ["js"]);
  gulp.watch("./src/css/**/*.css", ["css"]);
  gulp.watch("./src/cms/*", ["cms"]);
  gulp.watch("./site/static/img/icons/*.svg", ["svg"]);
  gulp.watch("./site/**/*", ["hugo"]);
});

function buildSite(cb, options) {
  const args = options ? defaultArgs.concat(options) : defaultArgs;

  return cp.spawn(hugoBin, args, {stdio: "inherit"}).on("close", (code) => {
    if (code === 0) {
      browserSync.reload("notify:false");
      cb();
    } else {
      browserSync.notify("Hugo build failed :(");
      cb("Hugo build failed");
    }
  });
}