Initial Quartz setup for Castle Docs

quartz/plugins/transformers/syntax.ts

@@ -0,0 +1,31 @@
+import { QuartzTransformerPlugin } from "../types"
+import rehypePrettyCode, { Options as CodeOptions, Theme as CodeTheme } from "rehype-pretty-code"
+
+interface Theme extends Record<string, CodeTheme> {
+  light: CodeTheme
+  dark: CodeTheme
+}
+
+interface Options {
+  theme?: Theme
+  keepBackground?: boolean
+}
+
+const defaultOptions: Options = {
+  theme: {
+    light: "github-light",
+    dark: "github-dark",
+  },
+  keepBackground: false,
+}
+
+export const SyntaxHighlighting: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
+  const opts: CodeOptions = { ...defaultOptions, ...userOpts }
+
+  return {
+    name: "SyntaxHighlighting",
+    htmlPlugins() {
+      return [[rehypePrettyCode, opts]]
+    },
+  }
+}