283 lines
11 KiB
JavaScript
283 lines
11 KiB
JavaScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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const path = require('path');
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async function readCSSSource(location) {
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const fs = require("fs").promises;
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const path = require("path");
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const resolvedLocation = path.resolve(__dirname, "../../", `${location}/theme.css`);
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const data = await fs.readFile(resolvedLocation);
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return data;
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}
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function getRootSectionWithVariables(variables) {
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return `:root{\n${Object.entries(variables).reduce((acc, [key, value]) => acc + `--${key}: ${value};\n`, "")} }\n\n`;
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}
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function appendVariablesToCSS(variables, cssSource) {
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return cssSource + getRootSectionWithVariables(variables);
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}
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function addThemesToConfig(bundle, manifestLocations, defaultThemes) {
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for (const [fileName, info] of Object.entries(bundle)) {
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if (fileName === "config.json") {
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const source = new TextDecoder().decode(info.source);
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const config = JSON.parse(source);
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config["themeManifests"] = manifestLocations;
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config["defaultTheme"] = defaultThemes;
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info.source = new TextEncoder().encode(JSON.stringify(config));
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}
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}
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}
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function parseBundle(bundle) {
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const chunkMap = new Map();
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const assetMap = new Map();
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let runtimeThemeChunk;
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for (const [fileName, info] of Object.entries(bundle)) {
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if (!fileName.endsWith(".css")) {
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continue;
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}
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if (info.type === "asset") {
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/**
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* So this is the css assetInfo that contains the asset hashed file name.
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* We'll store it in a separate map indexed via fileName (unhashed) to avoid
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* searching through the bundle array later.
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*/
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assetMap.set(info.name, info);
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continue;
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}
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if (info.facadeModuleId?.includes("type=runtime")) {
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/**
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* We have a separate field in manifest.source just for the runtime theme,
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* so store this separately.
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*/
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runtimeThemeChunk = info;
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continue;
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}
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const location = info.facadeModuleId?.match(/(.+)\/.+\.css/)?.[1];
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if (!location) {
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throw new Error("Cannot find location of css chunk!");
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}
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const array = chunkMap.get(location);
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if (!array) {
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chunkMap.set(location, [info]);
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}
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else {
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array.push(info);
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}
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}
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return { chunkMap, assetMap, runtimeThemeChunk };
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}
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module.exports = function buildThemes(options) {
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let manifest, variants, defaultDark, defaultLight, defaultThemes = {};
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let isDevelopment = false;
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const virtualModuleId = '@theme/'
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const resolvedVirtualModuleId = '\0' + virtualModuleId;
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return {
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name: "build-themes",
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enforce: "pre",
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configResolved(config) {
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if (config.command === "serve") {
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isDevelopment = true;
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}
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},
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async buildStart() {
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if (isDevelopment) { return; }
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const { themeConfig } = options;
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for (const [name, location] of Object.entries(themeConfig.themes)) {
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manifest = require(`${location}/manifest.json`);
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variants = manifest.values.variants;
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for (const [variant, details] of Object.entries(variants)) {
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const fileName = `theme-${name}-${variant}.css`;
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if (name === themeConfig.default && details.default) {
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// This is the default theme, stash the file name for later
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if (details.dark) {
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defaultDark = fileName;
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defaultThemes["dark"] = `${name}-${variant}`;
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}
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else {
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defaultLight = fileName;
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defaultThemes["light"] = `${name}-${variant}`;
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}
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}
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// emit the css as built theme bundle
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this.emitFile({
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type: "chunk",
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id: `${location}/theme.css?variant=${variant}${details.dark? "&dark=true": ""}`,
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fileName,
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});
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}
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// emit the css as runtime theme bundle
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this.emitFile({
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type: "chunk",
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id: `${location}/theme.css?type=runtime`,
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fileName: `theme-${name}-runtime.css`,
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});
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}
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},
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resolveId(id) {
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if (id.startsWith(virtualModuleId)) {
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return '\0' + id;
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}
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},
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async load(id) {
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if (isDevelopment) {
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/**
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* To load the theme during dev, we need to take a different approach because emitFile is not supported in dev.
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* We solve this by resolving virtual file "@theme/name/variant" into the necessary css import.
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* This virtual file import is removed when hydrogen is built (see transform hook).
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*/
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if (id.startsWith(resolvedVirtualModuleId)) {
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let [theme, variant, file] = id.substr(resolvedVirtualModuleId.length).split("/");
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if (theme === "default") {
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theme = options.themeConfig.default;
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}
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const location = options.themeConfig.themes[theme];
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const manifest = require(`${location}/manifest.json`);
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const variants = manifest.values.variants;
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if (!variant || variant === "default") {
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// choose the first default variant for now
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// this will need to support light/dark variants as well
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variant = Object.keys(variants).find(variantName => variants[variantName].default);
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}
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if (!file) {
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file = "index.js";
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}
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switch (file) {
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case "index.js": {
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const isDark = variants[variant].dark;
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return `import "${path.resolve(`${location}/theme.css`)}${isDark? "?dark=true": ""}";` +
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`import "@theme/${theme}/${variant}/variables.css"`;
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}
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case "variables.css": {
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const variables = variants[variant].variables;
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const css = getRootSectionWithVariables(variables);
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return css;
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}
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}
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}
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}
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else {
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const result = id.match(/(.+)\/theme.css\?variant=([^&]+)/);
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if (result) {
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const [, location, variant] = result;
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const cssSource = await readCSSSource(location);
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const config = variants[variant];
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return appendVariablesToCSS(config.variables, cssSource);
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}
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return null;
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}
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},
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transform(code, id) {
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if (isDevelopment) {
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return;
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}
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/**
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* Removes develop-only script tag; this cannot be done in transformIndexHtml hook because
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* by the time that hook runs, the import is added to the bundled js file which would
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* result in a runtime error.
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*/
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const devScriptTag =
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/<script type="module"> import "@theme\/.+"; <\/script>/;
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if (id.endsWith("index.html")) {
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const htmlWithoutDevScript = code.replace(devScriptTag, "");
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return htmlWithoutDevScript;
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}
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},
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transformIndexHtml(_, ctx) {
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if (isDevelopment) {
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// Don't add default stylesheets to index.html on dev
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return;
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}
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let darkThemeLocation, lightThemeLocation;
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for (const [, bundle] of Object.entries(ctx.bundle)) {
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if (bundle.name === defaultDark) {
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darkThemeLocation = bundle.fileName;
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}
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if (bundle.name === defaultLight) {
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lightThemeLocation = bundle.fileName;
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}
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}
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return [
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{
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tag: "link",
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attrs: {
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rel: "stylesheet",
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type: "text/css",
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media: "(prefers-color-scheme: dark)",
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href: `./${darkThemeLocation}`,
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class: "theme",
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}
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},
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{
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tag: "link",
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attrs: {
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rel: "stylesheet",
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type: "text/css",
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media: "(prefers-color-scheme: light)",
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href: `./${lightThemeLocation}`,
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class: "theme",
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}
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},
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];
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},
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generateBundle(_, bundle) {
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const { assetMap, chunkMap, runtimeThemeChunk } = parseBundle(bundle);
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const manifestLocations = [];
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for (const [location, chunkArray] of chunkMap) {
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const manifest = require(`${location}/manifest.json`);
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const compiledVariables = options.compiledVariables.get(location);
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const derivedVariables = compiledVariables["derived-variables"];
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const icon = compiledVariables["icon"];
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const builtAssets = {};
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/**
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* Generate a mapping from theme name to asset hashed location of said theme in build output.
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* This can be used to enumerate themes during runtime.
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*/
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for (const chunk of chunkArray) {
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const [, name, variant] = chunk.fileName.match(/theme-(.+)-(.+)\.css/);
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builtAssets[`${name}-${variant}`] = assetMap.get(chunk.fileName).fileName;
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}
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manifest.source = {
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"built-assets": builtAssets,
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"runtime-asset": assetMap.get(runtimeThemeChunk.fileName).fileName,
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"derived-variables": derivedVariables,
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"icon": icon
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};
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const name = `theme-${manifest.name}.json`;
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manifestLocations.push(`assets/${name}`);
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this.emitFile({
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type: "asset",
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name,
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source: JSON.stringify(manifest),
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});
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}
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addThemesToConfig(bundle, manifestLocations, defaultThemes);
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},
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}
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}
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