marksmall/node-build-web-app

"use strict";

// Include Gulp & tools we"ll use
import gulp from "gulp";
import notify from "gulp-notify";
import gutil from "gulp-util";
import plumber from "gulp-plumber";

let exitOnError = false; // whether we should make the house explode whenever errors occur (e.g., stop gulp serve)

// display errors nicely and avoid having errors breaking tasks/watch
// reference: https://github.com/mikaelbr/gulp-notify/issues/81
let reportError = function(error){
    let lineNumber = error.lineNumber ? "LINE " + error.lineNumber + " -- " : "";

    notify({
        title: "Task Failed [" + error.plugin + "]",
        message: lineNumber + "See console.",
        sound: true

        // the version below probably works on OSX
        //sound: "Sosumi" // See: https://github.com/mikaelbr/node-notifier#all-notification-options-with-their-defaults
    }).write(error);

    //gutil.beep(); // Beep "sosumi" again

    // Inspect the error object
    //gutil.log(error);

    // Easy error reporting
    //console.log(error.toString());

    // Pretty error reporting
    let report = "";
    let chalk = gutil.colors.white.bgRed;

    report += chalk("TASK:") + " [" + error.plugin + "]\n";
    report += chalk("ISSUE:") + " " + error.message + "\n";

    if(error.lineNumber){
        report += chalk("LINE:") + " " + error.lineNumber + "\n";
    }

    if(error.fileName){
        report += chalk("FILE:") + " " + error.fileName + "\n";
    }

    console.error(report);

    if(exitOnError){
        process.exit(1);
    } else{
        // Prevent the "watch" task from stopping
        this.emit("end");
    }
};

// easily integrate plumber invocation
// reference: https://gist.github.com/floatdrop/8269868
let plumbedSrc = function(){
    return gulp.src.apply(gulp, arguments)
        .pipe(plumber({
            errorHandler: reportError
        }));
};

// utility function to exclude files from globs
let exclude = function(providedPath){
    return "!" + providedPath;
};

// utility function that filters out empty directories
// reference: http://stackoverflow.com/questions/23719731/gulp-copying-empty-directories
let filterEmptyDirectories = function(es){
    return es.map((file, cb) =>{
        if(file.stat.isFile()){
            return cb(null, file);
        } else{
            return cb();
        }
    });
};

export default {
    exclude,
    reportError,
    plumbedSrc,
    filterEmptyDirectories
};