marksmall/node-build-web-app

"use strict";

import AbstractTaskLoader from "../abstractTaskLoader";
import config from "../config";
import utils from "../utils";

import sass from "gulp-sass";
import sourcemaps from "gulp-sourcemaps";
import autoprefixer from "gulp-autoprefixer";
import iff from "gulp-if";
import size from "gulp-size";
//import debug from "gulp-debug";

let browserSync = require("browser-sync").get(config.webServerNames.dev);

class StylesTaskLoader extends AbstractTaskLoader {
    registerTask(gulp){
        super.registerTask(gulp);

        gulp.task("styles", "Compile, add vendor prefixes and generate sourcemaps", () =>{
            // If the app src folder is overridden, then append it to the watch list, otherwise use default.
            let src = utils.getCssFolder(gulp, config);

            return gulp.plumbedSrc(// handle errors nicely (i.e., without breaking watch)
                src
                )

                // Display the files in the stream
                //.pipe(debug({title: "Stream contents:", minimal: true}))

                // Initialize sourcemap generation
                .pipe(sourcemaps.init({
                    //debug: true
                }))

                // Process the sass files
                .pipe(sass({
                    style: "compressed"
                    //errLogToConsole: true
                }).on("error", sass.logError))

                // Write sourcemaps: https://www.npmjs.com/package/gulp-sourcemaps
                .pipe(sourcemaps.write(".", { // use "." to write the sourcemap to a separate file in the same dir
                    includeContent: false, // alternative: include the contents and remove sourceRoot. Avoids issues but prevents from editing the sources directly in the browser
                    sourceRoot: "/" // use an absolute path because we have scripts in different subpaths
                }))

                // Include vendor prefixes
                // The if clause prevents autoprefixer from messing up the sourcemaps (necessary if the maps are put in separate files)
                // reference: https://github.com/sindresorhus/gulp-autoprefixer/issues/8#issuecomment-93817177
                .pipe(iff([ config.extensions.css, "!*.map" ], autoprefixer({
                    browsers: config.autoprefixerBrowsers // alternative: $.autoprefixer("last 2 version")
                })))

                // Output files
                .pipe(gulp.dest(config.styles.dest))

                // Reload Browser if needed
                // Stream if possible
                .pipe(iff(browserSync.active, browserSync.stream({
                    once: true,
                    stream: true
                })))

                // Task result
                .pipe(size({
                    title: "styles"
                }));
        });
    }
}

module.exports = new StylesTaskLoader();