Swapping out Grunt for Gulp

Gruntfile.js

@@ -1,65 +0,0 @@
-module.exports = function(grunt) {
-
-  // Project configuration.
-  grunt.initConfig({
-    pkg: grunt.file.readJSON('package.json'),
-
-    sass: {
-      dist: {
-        options: {
-          style: 'compressed'
-        },
-        files: [{
-          expand: true,
-          cwd: 'assets/styles',
-          src: ['**/*.sass'],
-          dest: 'public/css',
-          ext: '.css'
-        }]
-      }
-    },
-
-    coffee: {
-      options: {
-        sourceMap: true,
-        style: 'compressed'
-      },
-      files: {
-        expand: true,
-        flatten: true,
-        cwd: 'assets/scripts',
-        src: ['*.coffee'],
-        dest: 'public/js',
-        ext: '.js'
-      }
-    },
-
-    watch: {
-      css: {
-        files: ['assets/styles/**/*.sass'],
-        tasks: ['sass'],
-        options: {
-          atBegin: true,
-          spawn: false
-        }
-      },
-      js: {
-        files: ['assets/scripts/**/*.coffee'],
-        tasks: ['coffee'],
-        options: {
-          atBegin: true,
-          spawn: false
-        }
-      }
-    }
-  });
-
-  // Load plugins.
-  grunt.loadNpmTasks('grunt-contrib-watch');
-  grunt.loadNpmTasks('grunt-contrib-sass');
-  grunt.loadNpmTasks('grunt-contrib-coffee');
-
-  // CLI tasks.
-  grunt.registerTask('default', ['sass', 'coffee']);
-
-};

gulpfile.js

@@ -0,0 +1,39 @@
+const gulp = require('gulp');
+const sass = require('gulp-sass')(require('sass'));
+const coffee = require('gulp-coffee');
+const sourcemaps = require('gulp-sourcemaps');
+const plumber = require('gulp-plumber');
+
+// Compile .sass files to compressed CSS
+function compileSass() {
+  return gulp.src('assets/styles/**/*.sass')
+    .pipe(plumber())
+    .pipe(sass({ outputStyle: 'compressed' }).on('error', sass.logError))
+    .pipe(gulp.dest('public/css'));
+}
+
+// Compile .coffee files to JavaScript with source maps
+function compileCoffee() {
+  return gulp.src('assets/scripts/*.coffee', { sourcemaps: true })
+    .pipe(plumber())
+    .pipe(coffee({ bare: true }))
+    .pipe(gulp.dest('public/js', { sourcemaps: '.' }));
+}
+
+// Watch files for changes
+function watchFiles() {
+  gulp.watch('assets/styles/**/*.sass', compileSass);
+  gulp.watch('assets/scripts/**/*.coffee', compileCoffee);
+}
+
+// Define default task
+exports.default = gulp.series(
+  gulp.parallel(compileSass, compileCoffee),
+  watchFiles
+);
+
+// one-time build
+exports.build = gulp.parallel(compileSass, compileCoffee);
+
+// start builds with file watching
+exports.watch = watchFiles;

package.json

@@ -4,7 +4,7 @@
   "version": "0.1.0",
   "main": "src/server.rb",
   "scripts": {
-    "grunt": "grunt"
+    "gulp": "gulp"
   },
   "repository": {
     "type": "git",
@@ -18,11 +18,11 @@
   "author": "Gregory Ballantine <gballantine@bitgoblin.tech>",
   "license": "BSD-2-Clause",
   "devDependencies": {
-    "grunt": "^1.6.1",
-    "grunt-cli": "^1.4.3",
-    "grunt-contrib-coffee": "^2.1.0",
-    "grunt-contrib-sass": "^2.0.0",
-    "grunt-contrib-watch": "^1.1.0",
-    "sass": "^1.77.4"
+    "gulp": "^5.0.1",
+    "gulp-coffee": "^3.0.3",
+    "gulp-plumber": "^1.2.1",
+    "gulp-sass": "^6.0.1",
+    "gulp-sourcemaps": "^3.0.0",
+    "sass": "^1.89.2"
   }
 }