From 66649ad834452a5732dfd49412e72e58b3eb260e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Chalifour?= <francois.chalifour@gmail.com>
Date: Wed, 26 Aug 2020 12:01:30 +0200
Subject: [PATCH] chore(css): add banners to DocSearch CSS bundles

---
 build-css.js | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 package.json |  2 +-
 2 files changed, 91 insertions(+), 1 deletion(-)
 create mode 100644 build-css.js

diff --git a/build-css.js b/build-css.js
new file mode 100644
index 00000000..c56e1e85
--- /dev/null
+++ b/build-css.js
@@ -0,0 +1,90 @@
+/* eslint-disable import/no-commonjs */
+
+const fs = require('fs');
+const util = require('util');
+const { execSync } = require('child_process');
+
+const cssnano = require('cssnano');
+const postcss = require('postcss');
+
+const pkg = require('./package.json');
+
+const readFile = util.promisify(fs.readFile);
+
+if (process.env.NODE_ENV === 'production' && !process.env.VERSION) {
+  throw new Error(
+    `You need to specify a valid semver environment variable 'VERSION' to run the build process (received: ${JSON.stringify(
+      process.env.VERSION
+    )}).`
+  );
+}
+
+function getBundleBanner(pkg) {
+  const lastCommitHash = execSync('git rev-parse --short HEAD')
+    .toString()
+    .trim();
+  const version =
+    process.env.NODE_ENV === 'production'
+      ? process.env.VERSION
+      : `${pkg.version} (UNRELEASED ${lastCommitHash})`;
+  const authors = '© Algolia, Inc. and contributors';
+
+  return `/*! ${pkg.name} ${version} | MIT License | ${authors} | ${pkg.homepage} */`;
+}
+
+function build({ input, output, banner }) {
+  fs.readFile(input, (error, css) => {
+    if (error) {
+      throw error;
+    }
+
+    postcss([cssnano])
+      .process(css, { from: input, to: output })
+      .then((result) => {
+        fs.writeFile(output, [banner, result.css].join('\n'), () => true);
+      });
+  });
+}
+
+build({
+  input: 'src/_variables.css',
+  output: 'dist/_variables.css',
+  banner: getBundleBanner({ ...pkg, name: `${pkg.name} Variables` }),
+});
+build({
+  input: 'src/button.css',
+  output: 'dist/button.css',
+  banner: getBundleBanner({ ...pkg, name: `${pkg.name} Button` }),
+});
+build({
+  input: 'src/modal.css',
+  output: 'dist/modal.css',
+  banner: getBundleBanner({ ...pkg, name: `${pkg.name} Modal` }),
+});
+
+async function buildStyle() {
+  const variablesCss = await readFile('src/_variables.css');
+  const buttonCss = await readFile('src/button.css');
+  const modalCss = await readFile('src/modal.css');
+
+  const variablesOutput = await postcss([cssnano]).process(variablesCss, {
+    from: undefined,
+  });
+  const buttonOutput = await postcss([cssnano]).process(buttonCss, {
+    from: undefined,
+  });
+  const modalOutput = await postcss([cssnano]).process(modalCss, {
+    from: undefined,
+  });
+
+  fs.writeFile(
+    'dist/style.css',
+    [
+      getBundleBanner(pkg),
+      [variablesOutput.css, buttonOutput.css, modalOutput.css].join(''),
+    ].join('\n'),
+    () => true
+  );
+}
+
+buildStyle();
diff --git a/package.json b/package.json
index cca1c3d2..a04d4636 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "jsdelivr": "dist/style.css",
   "scripts": {
     "build": "yarn build:clean && mkdir dist && yarn build:css",
-    "build:css": "cp src/_variables.css dist/ && cp src/modal.css dist/ && cp src/button.css dist/ && cat src/*.css > dist/style.css",
+    "build:css": "node build-css.js",
     "build:clean": "rm -rf ./dist",
     "watch": "watch \"yarn build:css\" --ignoreDirectoryPattern \"/dist/\""
   }