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scripts/build-plugins/rollup-plugin-build-themes.js
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64
scripts/build-plugins/rollup-plugin-build-themes.js
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/*
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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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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, "../../", `${location}/theme.css`);
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const data = await fs.readFile(resolvedLocation);
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return data;
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}
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async function appendVariablesToCSS(variables, cssSource) {
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return cssSource + `:root{\n${Object.entries(variables).reduce((acc, [key, value]) => acc + `--${key}: ${value};\n`, "")} }\n\n`;
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}
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module.exports = function buildThemes(options) {
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let manifest, variants;
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return {
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name: "build-themes",
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enforce: "pre",
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async buildStart() {
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const { manifestLocations } = options;
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for (const location of manifestLocations) {
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manifest = require(`${location}/manifest.json`);
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variants = manifest.values.variants;
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for (const [variant] of Object.entries(variants)) {
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const themeName = manifest.name;
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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}`,
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fileName: `theme-${themeName}-${variant}.css`,
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});
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}
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}
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},
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async load(id) {
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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 await 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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}
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