Support theming in dev server

This commit is contained in:
RMidhunSuresh 2022-04-10 14:49:19 +05:30
parent a6b6fef6d2
commit ff98ef4465

View file

@ -13,17 +13,45 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
const path = require('path');
async function readCSSSource(location) {
const fs = require("fs").promises;
const path = require("path");
const resolvedLocation = path.resolve(__dirname, "../../", `${location}/theme.css`);
const resolvedLocation = path.resolve(__dirname, "../../", `${location}/theme.css`);
const data = await fs.readFile(resolvedLocation);
return data;
}
async function appendVariablesToCSS(variables, cssSource) {
return cssSource + `:root{\n${Object.entries(variables).reduce((acc, [key, value]) => acc + `--${key}: ${value};\n`, "")} }\n\n`;
function getRootSectionWithVariables(variables) {
return `:root{\n${Object.entries(variables).reduce((acc, [key, value]) => acc + `--${key}: ${value};\n`, "")} }\n\n`;
}
function appendVariablesToCSS(variables, cssSource) {
return cssSource + getRootSectionWithVariables(variables);
}
function findLocationFromThemeName(name, locations) {
const themeLocation = locations.find(location => {
const manifest = require(`${location}/manifest.json`);
if (manifest.name === name) {
return true;
}
});
if (!themeLocation) {
throw new Error(`Cannot find location from theme name "${name}"`);
}
return themeLocation;
}
function findManifestFromThemeName(name, locations) {
for (const location of locations) {
const manifest = require(`${location}/manifest.json`);
if (manifest.name === name) {
return manifest;
}
}
throw new Error(`Cannot find manifest from theme name "${name}"`);
}
function parseBundle(bundle) {
@ -68,11 +96,20 @@ function parseBundle(bundle) {
module.exports = function buildThemes(options) {
let manifest, variants, defaultDark, defaultLight;
let isDevelopment = false;
const virtualModuleId = '@theme/'
const resolvedVirtualModuleId = '\0' + virtualModuleId;
return {
name: "build-themes",
enforce: "pre",
configResolved(config) {
if (config.command === "serve") {
isDevelopment = true;
}
},
async buildStart() {
const { manifestLocations } = options;
for (const location of manifestLocations) {
@ -106,69 +143,108 @@ module.exports = function buildThemes(options) {
}
},
resolveId(id) {
if (id.startsWith(virtualModuleId)) {
return isDevelopment? '\0' + id: false;
}
},
async load(id) {
const result = id.match(/(.+)\/theme.css\?variant=(.+)/);
if (result) {
const [, location, variant] = result;
const cssSource = await readCSSSource(location);
const config = variants[variant];
return await appendVariablesToCSS(config.variables, cssSource);
}
return null;
},
transformIndexHtml(_, ctx) {
let darkThemeLocation, lightThemeLocation;
for (const [, bundle] of Object.entries(ctx.bundle)) {
if (bundle.name === defaultDark) {
darkThemeLocation = bundle.fileName;
}
if (bundle.name === defaultLight) {
lightThemeLocation = bundle.fileName;
if (isDevelopment) {
if (id.startsWith(resolvedVirtualModuleId)) {
let [theme, variant, file] = id.substr(resolvedVirtualModuleId.length).split("/");
if (theme === "default") {
theme = "Element";
}
if (!variant || variant === "default") {
variant = "light";
}
if (!file) {
file = "index.js";
}
switch (file) {
case "index.js": {
const location = findLocationFromThemeName(theme, options.manifestLocations);
return `import "${path.resolve(`${location}/theme.css`)}";` +
`import "@theme/${theme}/${variant}/variables.css"`;
}
case "variables.css": {
const manifest = findManifestFromThemeName(theme, options.manifestLocations);
const variables = manifest.values.variants[variant].variables;
const css = getRootSectionWithVariables(variables);
return css;
}
}
}
}
return [
{
tag: "link",
attrs: {
rel: "stylesheet",
type: "text/css",
media: "(prefers-color-scheme: dark)",
href: `./${darkThemeLocation}`,
}
},
{
tag: "link",
attrs: {
rel: "stylesheet",
type: "text/css",
media: "(prefers-color-scheme: light)",
href: `./${lightThemeLocation}`,
}
},
];
},
else {
const result = id.match(/(.+)\/theme.css\?variant=(.+)/);
if (result) {
const [, location, variant] = result;
const cssSource = await readCSSSource(location);
const config = variants[variant];
return await appendVariablesToCSS(config.variables, cssSource);
}
return null;
}
},
generateBundle(_, bundle) {
const { assetMap, chunkMap, runtimeThemeChunk } = parseBundle(bundle);
for (const [location, chunkArray] of chunkMap) {
const manifest = require(`${location}/manifest.json`);
const compiledVariables = options.compiledVariables.get(location);
const derivedVariables = compiledVariables["derived-variables"];
const icon = compiledVariables["icon"];
manifest.source = {
"built-asset": chunkArray.map(chunk => assetMap.get(chunk.fileName).fileName),
"runtime-asset": assetMap.get(runtimeThemeChunk.fileName).fileName,
"derived-variables": derivedVariables,
"icon": icon
};
const name = `theme-${manifest.name}.json`;
this.emitFile({
type: "asset",
name,
source: JSON.stringify(manifest),
});
transformIndexHtml(_, ctx) {
if (isDevelopment) {
// Don't add default stylesheets to index.html on dev
return;
}
let darkThemeLocation, lightThemeLocation;
for (const [, bundle] of Object.entries(ctx.bundle)) {
if (bundle.name === defaultDark) {
darkThemeLocation = bundle.fileName;
}
if (bundle.name === defaultLight) {
lightThemeLocation = bundle.fileName;
}
}
return [
{
tag: "link",
attrs: {
rel: "stylesheet",
type: "text/css",
media: "(prefers-color-scheme: dark)",
href: `./${darkThemeLocation}`,
}
},
{
tag: "link",
attrs: {
rel: "stylesheet",
type: "text/css",
media: "(prefers-color-scheme: light)",
href: `./${lightThemeLocation}`,
}
},
];
},
generateBundle(_, bundle) {
const { assetMap, chunkMap, runtimeThemeChunk } = parseBundle(bundle);
for (const [location, chunkArray] of chunkMap) {
const manifest = require(`${location}/manifest.json`);
const compiledVariables = options.compiledVariables.get(location);
const derivedVariables = compiledVariables["derived-variables"];
const icon = compiledVariables["icon"];
manifest.source = {
"built-asset": chunkArray.map(chunk => assetMap.get(chunk.fileName).fileName),
"runtime-asset": assetMap.get(runtimeThemeChunk.fileName).fileName,
"derived-variables": derivedVariables,
"icon": icon
};
const name = `theme-${manifest.name}.json`;
this.emitFile({
type: "asset",
name,
source: JSON.stringify(manifest),
});
}
}
}
}