DeepSilence/ResponsiveGauge

var gulp = require("gulp");
var util = require('util');
var glob = require("glob")
var rename = require('gulp-rename');
var jest = require('gulp-jest');
var stripCode = require('gulp-strip-code');
var uglify = require('gulp-uglify');
var cssmin = require('gulp-cssmin');
var plumber = require("gulp-plumber");
var fs = require('fs');
var replace = require("replace");

var paths = {
    srcJs : 'src/**/*.js',
    srcCss : 'src/**/*.css',
    destCss : 'dist',
    testSrc : 'test',
    testSrcJs : 'test/*.js',
    distribution : 'dist/',
    minifiedCss : 'ResponsiveGauge.min.css',
    tempFile : 'ResponsiveGauge.tmp.js',
    minifiedJs : 'ResponsiveGauge.min.js',
    manualTest : '!test/manual/**/*.js'
};

/**
 * Function to avoid exiting on errors
 */
function writeErrors() {
    return plumber(function(error) {
        util.log(error.message);
    });
}

gulp.task("default", function() {
    gulp.start('buildAll');

    // watch for changes
    gulp.watch([ paths.srcJs, paths.srcCss ], function() {
        gulp.start('buildAll');
    });
});

/**
 * Build js, css, and merge everything into a single file
 */
gulp.task('buildAll', [ 'buildCss', 'buildJs', 'merge' ]);

/**
 * Build js
 */
gulp.task('buildJs', [ 'buildCss' ], function() {
    return gulp.src(paths.srcJs)//
    .pipe(writeErrors())//
    .pipe(stripCode({ // remove test code
        start_comment : "start-test-code",
        end_comment : "end-test-code"
    })).pipe(uglify({
        preserveComments : 'license'
    })) // minimize
    .pipe(rename(paths.tempFile)).pipe(gulp.dest(paths.distribution));
});

/**
 * Build css
 */
gulp.task('buildCss', function() {
    return gulp.src(paths.srcCss)//
    .pipe(writeErrors())//
    .pipe(cssmin()) // minimize
    .pipe(rename(paths.minifiedCss)).pipe(gulp.dest(paths.destCss));
});

/**
 * Merge everything into a single file
 */
gulp.task('merge', [ 'buildJs' ], function() {
    var dist = paths.distribution;

    // Merge Js and CSS in final file
    var css = fs.readFileSync(dist + paths.minifiedCss);
    replace({
        regex : '#!#CSS#!#',
        replacement : css,
        silent : true,
        paths : [ dist + paths.tempFile ]
    });
    fs.writeFileSync(dist + paths.minifiedJs, fs.readFileSync(dist + paths.tempFile));

    fs.unlinkSync(dist + paths.tempFile);
    fs.unlinkSync(dist + paths.minifiedCss);
});

/**
 * Test task
 */
gulp.task('test', function() {
    gulp.src(paths.testSrcJs).pipe(jest({
        verbose : true,
        unmockedModulePathPatterns : [ "node_modules/*" ],
        testDirectoryName : paths.testSrc
    }));
});