ci: replace asset build script by fresh plugin

build.ts

@@ -1,56 +0,0 @@
-import { bundleAsync } from 'lightningcss'
-import { ensureDir } from '$std/fs/mod.ts'
-import { parse, resolve } from '$std/path/mod.ts'
-
-console.log('building styles starts')
-await ensureDir('_fresh')
-
-try {
-	//prevent Deno from exiting before bundle
-	setTimeout(() => {}, 2_000)
-
-	const cssImports = new Map()
-
-	const { code, map } = await bundleAsync({
-		filename: './src/stylesheets/main.css',
-		minify: true,
-		sourceMap: true,
-		resolver: {
-			read(path) {
-				return Deno.readTextFile(path)
-			},
-			async resolve(specifier, from) {
-				//resolve local files normally
-				if (!specifier.startsWith('https://')) {
-					return resolve(parse(from).dir, specifier)
-				}
-				//use cache for remote
-				if (cssImports.has(specifier)) return cssImports.get(specifier)
-
-				//update cache for new remote
-				const response = await fetch(specifier)
-				const file = await response.arrayBuffer()
-                const hash = new Uint8Array(await crypto.subtle.digest('SHA-256', file))
-                const filename = [...hash].map(value => value.toString(16).padStart(2, '0')).join('')
-
-				const filepath = `_fresh/${filename}`
-				await Deno.writeFile(filepath, new Uint8Array(file))
-				cssImports.set(specifier, filepath)
-				return filepath
-			},
-		},
-	})
-
-	await Deno.writeTextFile(
-		'./static/dev/styles.css',
-		new TextDecoder().decode(code),
-	)
-	await Deno.writeTextFile(
-		'./static/dev/styles.map.css',
-		new TextDecoder().decode(map ?? new Uint8Array()),
-	)
-} catch (error) {
-	console.error(error)
-}
-
-console.log('building styles finish')

deno.json

@@ -8,8 +8,7 @@
 		"build": "deno run -A dev.ts build",
 		"preview": "deno run -A main.ts",
 		"update": "deno run -A -r https://fresh.deno.dev/update .",
-		"assets:watch": "deno run -A --watch=src/ build.ts",
-		"assets": "deno run -A build.ts"
+		"prod": "deno task build && export PORT=80 && deno task preview"
 	},
 	"fmt": {
 		"singleQuote": true,

fresh.config.ts

@@ -1,3 +1,8 @@
 import { defineConfig } from '$fresh/server.ts'
+import { cssBundler } from './plugins/css_bundler/plugin.ts'
 
-export default defineConfig({})
+export default defineConfig({
+	plugins: [
+		cssBundler(import.meta.resolve('./src/stylesheets')),
+	],
+})

plugins/css_bundler/plugin.ts

@@ -0,0 +1,29 @@
+import { Plugin } from '$fresh/server.ts'
+import { fromFileUrl } from '$std/path/mod.ts'
+import { bundleCss } from './src/bundler.ts'
+import { cssHandler } from './src/middleware.ts'
+
+export function cssBundler(sourceDir: string, pattern = /main.css/): Plugin {
+	return {
+		name: 'css_bundler',
+		middlewares: [{
+			middleware: { handler: cssHandler(sourceDir) },
+			path: '/',
+		}],
+		async buildStart(config) {
+			//Get fresh build directory
+			const { outDir } = config.build
+			const tasks: Promise<void>[] = []
+
+			//Get all source stylesheets
+			for await (const entry of Deno.readDir(fromFileUrl(sourceDir))) {
+				if (entry.isFile && entry.name.match(pattern)) {
+					tasks.push(bundleCss(sourceDir, outDir, entry.name, config.dev))
+				}
+			}
+
+			//Await for all bundle to finish
+			await Promise.all(tasks)
+		},
+	}
+}

plugins/css_bundler/src/builder.ts

@@ -0,0 +1,59 @@
+import { join, parse, resolve, toFileUrl } from '$std/path/mod.ts'
+import { bundleAsync } from 'lightningcss'
+import { cssImports, hashFile, Logger } from './helpers.ts'
+
+export async function builder(
+	{ filename, dev, assetDir }: {
+		filename: string
+		dev: boolean
+		assetDir: string
+	},
+) {
+	const { code, map } = await bundleAsync({
+		filename,
+		minify: true,
+		sourceMap: dev,
+		resolver: {
+			read(path) {
+				return Deno.readTextFile(path)
+			},
+			async resolve(specifier, from) {
+				//resolve local files normally
+				if (!specifier.startsWith('https://') && !from.startsWith('https://')) {
+					Logger.info('resolve local file', specifier)
+					return resolve(parse(from).dir, specifier)
+				}
+				//use cache for remote
+				if (cssImports.has(`${from}/${specifier}`)) {
+					Logger.info('using cache for', `${from}/${specifier}`)
+					return cssImports.get(`${from}/${specifier}`)
+				}
+
+				//update cache for new remote
+				Logger.info('fetching and caching', `${from}/${specifier}`)
+
+				//construct asset url
+				const baseUrl = from.startsWith('https://') ? from : toFileUrl(from)
+				const url = new URL(specifier, baseUrl)
+
+				//fetch asset
+				const response = await fetch(url)
+				const file = await response.arrayBuffer()
+				const filename = await hashFile(file)
+
+				//!TODO recursive bundle to cache all remote imports
+				// bundleAsync({ minify: true, sourceMap: true, '' })
+				// const { code, map } = transform({ minify: true, sourceMap: dev, code: new Uint8Array(file), filename: url.toString() })
+
+				// const { code, map } = await builder({ filename: url.toString(), assetDir, dev })
+
+				const filepath = join(assetDir, filename)
+				await Deno.writeFile(filepath, new Uint8Array(file))
+				cssImports.set(`${from}/${specifier}`, filepath)
+				return filepath
+			},
+		},
+	})
+
+	return { code, map }
+}

plugins/css_bundler/src/bundler.ts

@@ -0,0 +1,31 @@
+import { fromFileUrl, join } from '$std/path/mod.ts'
+import { builder } from './builder.ts'
+import { cssImports, Logger } from './helpers.ts'
+
+export async function bundleCss(
+	sourceDir: string,
+	assetDir: string,
+	pathname: string,
+	dev: boolean,
+) {
+	const filename = fromFileUrl(join(sourceDir, pathname))
+	Logger.info('bundling', filename)
+
+	//prevent Deno from exiting before bundle
+	setTimeout(() => {}, 3_000)
+
+	try {
+		const { code, map } = await builder({ filename, dev, assetDir })
+
+		await Deno.writeFile(join(assetDir, pathname), code)
+		if (map) {
+			await Deno.writeFile(
+				join(assetDir, pathname.replace('.css', '.map.css')),
+				map,
+			)
+		}
+	} catch (error) {
+		Logger.error('error during bundle, cleaning cache', error)
+		cssImports.clear()
+	}
+}

plugins/css_bundler/src/helpers.ts

@@ -0,0 +1,28 @@
+export class Logger {
+	static #name = 'bundle_css'
+
+	static info(message: string, path?: string) {
+		console.log(
+			`%c[${this.#name}]%c ${message} %c${path ?? ''}`,
+			'color: blue; font-weight: bold',
+			'',
+			'color: green',
+		)
+	}
+
+	static error(message: string, error?: Error) {
+		console.error(
+			`%c[${this.#name}]%c ${message} %c${error?.toString() ?? ''}`,
+			'color: red; font-weight: bold',
+			'',
+			'color: yellow',
+		)
+	}
+}
+
+export async function hashFile(file: ArrayBuffer): Promise<string> {
+	const hash = new Uint8Array(await crypto.subtle.digest('SHA-256', file))
+	return [...hash].map((value) => value.toString(16).padStart(2, '0')).join('')
+}
+
+export const cssImports = new Map()

plugins/css_bundler/src/middleware.ts

@@ -0,0 +1,27 @@
+import { MiddlewareHandler } from '$fresh/server.ts'
+import { ensureDir } from '$std/fs/ensure_dir.ts'
+import { join } from '$std/path/mod.ts'
+import { bundleCss } from './bundler.ts'
+
+export function cssHandler(sourceDir: string): MiddlewareHandler {
+	return async (_, ctx) => {
+		const assetDir = join(ctx.config.build.outDir, '/static')
+		await ensureDir(assetDir)
+
+		if (ctx.config.dev) {
+			if (
+				ctx.url.pathname.startsWith('/') && ctx.url.pathname.endsWith('.css')
+			) {
+				bundleCss(sourceDir, assetDir, ctx.url.pathname, ctx.config.dev)
+				const file = await Deno.readFile(join(assetDir, ctx.url.pathname))
+				return new Response(file, {
+					headers: {
+						'Content-Type': 'text/css; charset=utf-8',
+					},
+				})
+			}
+		}
+		const resp = await ctx.next()
+		return resp
+	}
+}