Theme remixing: Dynamic code snippets (#729)

docs/assets/scripts/remix.js

@@ -0,0 +1,37 @@
+/**
+ * Get import code for remixed themes.
+ */
+export const urls = {
+  colors: id => `styles/themes/${id}/color.css`,
+  palette: id => `styles/color/${id}.css`,
+  brand: id => `styles/brand/${id}.css`,
+  typography: id => `styles/themes/${id}/typography.css`,
+};
+
+function getImport(url, options = {}) {
+  let { language = 'html', cdnUrl = '/dist/', attributes } = options;
+  url = cdnUrl + url;
+
+  if (language === 'css') {
+    return `@import url('${url}');`;
+  } else {
+    attributes = attributes ? ` ${attributes}` : '';
+    return `<link rel="stylesheet" href="${url}"${attributes} />`;
+  }
+}
+
+export function getCode(base, params, options) {
+  let ret = [];
+
+  if (base) {
+    ret.push(`styles/themes/${base}.css`);
+  }
+
+  ret.push(
+    ...Object.entries(params)
+      .filter(([aspect, id]) => Boolean(id))
+      .map(([aspect, id]) => urls[aspect](id)),
+  );
+
+  return ret.map(url => getImport(url, options)).join('\n');
+}