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gulpfile.js
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gulpfile.js
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const { src, dest, watch, series, parallel } = require("gulp");
const rename = require("gulp-rename");
const gulpIf = require("gulp-if");
// css
const postcss = require("gulp-postcss");
const tailwind = require("tailwindcss");
const autoprefixer = require("autoprefixer");
const purgecss = require("gulp-purgecss");
const cleanCss = require("gulp-clean-css");
// html
const nunjucks = require("gulp-nunjucks-render");
// javscript
const terser = require("gulp-terser");
// images
const responsive = require("gulp-responsive");
const cache = require("gulp-cached");
/******************************************************
* TASKS FOR DEVELOPMENT
* Processes all files in /src and places them in /dev
******************************************************/
// CSS processing – loads tailwind css file and adds browser compatibility prefixes
function css() {
return src("src/styles/*.css")
.pipe(postcss([tailwind(), autoprefixer()]))
.pipe(dest("dev/styles"));
}
// HTML processing – compiles njk files and converts them to html
function html() {
return (
src("src/templates/*.njk")
// Injects njk partials and then converts them to html files
.pipe(nunjucks({ path: "src/templates/partials" }))
// Runs gulp-rename on all files. Renames them index.html and puts them into a folder named after the file name. Excludes the original index.html and 404.html
.pipe(
gulpIf(
"!index.html",
gulpIf(
"!404.html",
// Creates a folder based on the file name and then renames the file index.html
rename(function (file) {
file.dirname = file.basename;
file.basename = "index";
file.extname = ".html";
})
)
)
)
.pipe(dest("dev"))
);
}
// Javascript processing – copies javascript files
function scripts() {
return src("src/scripts/*.js").pipe(dest("dev/scripts"));
}
// Font processing – copies font files
function typeface() {
return src("src/styles/*.woff").pipe(dest("dev/styles/"));
}
// Favicon processing – copies favicon files. Use https://realfavicongenerator.net to generate favicons
function favicon() {
return src([
"src/favicon/*.png",
"src/favicon/*.svg",
"src/favicon/*.xml",
"src/favicon/*.ico",
"src/favicon/*.webmanifest",
]).pipe(dest("dev"));
}
/****************
* Image processing
****************/
// Image resizing for responsive images – this ignores any image which has the suffix "-lazy.jpg"
function images() {
return (
src(["src/img/**/*.{jpg,png}", "!src/img/**/*-lazy.{jpg,png}"])
// Only processes images which are new or changed
.pipe(cache("imageResizing"))
.pipe(
responsive(
{
"*": [
{
width: 800,
rename: { suffix: "-800w" },
},
{
width: 1080,
rename: { suffix: "-1080w" },
},
{
width: 1440,
rename: { suffix: "-1440w" },
},
],
"**/*": [
{
width: 800,
rename: { suffix: "-800w" },
},
{
width: 1080,
rename: { suffix: "-1080w" },
},
{
width: 1440,
rename: { suffix: "-1440w" },
},
],
},
{
quality: 85,
skipOnEnlargement: true,
errorOnEnlargement: false,
}
)
)
.pipe(dest("dev/img"))
);
}
// Copies over the original images to /dev
function imageCopy() {
return src("src/img/**/*.{jpg,png,gif}").pipe(dest("dev/img"));
}
// Watchtasks
function watchTask() {
watch(["src/styles/*.css", "tailwind.config.js"], parallel(css));
watch(["src/templates/**/*.njk"], parallel(html));
watch(["src/scripts/*.js"], parallel(scripts));
watch(["src/img/**/*.{jpg,png,gif}"], parallel(images, imageCopy));
watch(["src/favicon"], parallel(favicon));
watch(["src/styles/*.woff"], parallel(typeface));
}
/******************************************************
* TASKS FOR PRODUCTION
* Processes all files in /dev and places them in /pub
******************************************************/
// CSS processing – removes any unused CSS and uglifies / minimises
function cssProduction() {
return (
src("dev/styles/*.css")
// purgeCSS removes any unsused CSS items
.pipe(
purgecss({
content: ["dev/**/*.html", "dev/scripts/*.js"],
defaultExtractor: (content) => content.match(/[\w-/:]+(?<!:)/g) || [],
})
)
// cleanCSS minifies CSS
.pipe(
cleanCss(
{
debug: true,
},
(details) => {
console.log(
details.name +
" was " +
details.stats.originalSize / 100 +
" bytes"
);
console.log(
details.name +
" is now " +
details.stats.minifiedSize / 100 +
" bytes"
);
}
)
)
.pipe(dest("public/styles"))
);
}
// HTML processing – copies over HTML files
function htmlProduction() {
return src("dev/**/*.html").pipe(dest("public"));
}
// Javascript processing – uglifies / minimises javascript
function scriptsProduction() {
return src("dev/scripts/*.js").pipe(terser()).pipe(dest("public/scripts"));
}
// Image processing – copies over images
function imgProduction() {
return src("dev/img/**/*.{jpg,gif,png}").pipe(dest("public/img/"));
}
// Font processing – copies over fonts
function typefaceProduction() {
return src("dev/styles/*.woff").pipe(dest("public/styles/"));
}
// Favicon processing - copies over favicon files
function faviconProduction() {
return src([
"dev/*.png",
"dev/*.svg",
"dev/*.xml",
"dev/*.ico",
"dev/*.webmanifest",
]).pipe(dest("public"));
}
/******************************************************
* TASKS
******************************************************/
exports.css = css;
exports.html = html;
exports.scripts = scripts;
exports.images = images;
exports.watchTask = watchTask;
exports.cssProduction = cssProduction;
/******************************************************
* COMPOUND TASKS
******************************************************/
exports.develop = parallel(
css,
html,
scripts,
typeface,
favicon,
images,
imageCopy,
watchTask
);
exports.production = parallel(
cssProduction,
htmlProduction,
scriptsProduction,
imgProduction,
typefaceProduction,
faviconProduction
);