refactor static and asset emission to be actual emitter plugins

quartz/plugins/emitters/assets.ts

@@ -0,0 +1,36 @@
+import { globbyStream } from "globby"
+import {
+  FilePath, slugifyFilePath,
+} from "../../path"
+import { QuartzEmitterPlugin } from "../types"
+import path from "path"
+import fs from "fs"
+
+export const Assets: QuartzEmitterPlugin = () => ({
+  name: "Assets",
+  getQuartzComponents() {
+    return []
+  },
+  async emit({ argv }, _content, _resources, _emit): Promise<FilePath[]> {
+    // glob all non MD/MDX/HTML files in content folder and copy it over
+    const assetsPath = path.join(argv.output, "assets")
+
+    const fps: FilePath[] = []
+    for await (const rawFp of globbyStream("**", {
+      ignore: ["**/*.md"],
+      cwd: argv.directory,
+    })) {
+      const fp = rawFp as FilePath
+      const ext = path.extname(fp)
+      const src = path.join(argv.directory, fp) as FilePath
+      const name = (slugifyFilePath(fp as FilePath) + ext) as FilePath
+      const dest = path.join(assetsPath, name) as FilePath
+      const dir = path.dirname(dest) as FilePath
+      await fs.promises.mkdir(dir, { recursive: true }) // ensure dir exists
+      await fs.promises.copyFile(src, dest)
+      fps.push(path.join("assets", fp) as FilePath)
+    }
+
+    return fps
+  },
+})