chore(pixiv): optimise commet, confirm regex usable (koishijs#238)

packages/pixiv/package.json

@@ -66,6 +66,7 @@
   "devDependencies": {
     "@koishijs/assets": "^1.0.4",
     "@koishijs/plugin-server": "^3.1.8",
+    "@satorijs/element": "^3.0.0",
     "koishi": "^4.17.3"
   },
   "publishConfig": {

packages/pixiv/src/utils.tsx

@@ -0,0 +1,35 @@
+/* eslint-disable brace-style */
+import { Element, h } from 'koishi'
+
+export function normaliseCaption(caption: string): Element {
+  if (!caption?.trim()) {
+    return <text></text>
+  }
+
+  return (
+    <>
+      {h.transform(h.parse(caption), {
+        a(attrs) {
+          let url = (attrs['href'] || '') as string
+          if (url) {
+            let m: RegExpMatchArray | null = null
+            // Convert pixiv://users/1234 to https://www.pixiv.net/u/1234
+            if (((m = /pixiv:\/\/users\/(?<id>\d+)/.exec(url)), m?.groups?.id)) {
+              url = `https://www.pixiv.net/u/${m.groups.id}`
+            }
+            // Convert pixiv://illusts/1234 to https://www.pixiv.net/i/1234
+            else if (((m = /pixiv:\/\/illusts\/(?<id>\d+)/.exec(url)), m?.groups?.id)) {
+              url = `https://www.pixiv.net/i/${m.groups.id}`
+            }
+            // Convert pixiv://novels/1234 to https://www.pixiv.net/novel/show.php?id=1234
+            else if (((m = /pixiv:\/\/novels\/(?<id>\d+)/.exec(url)), m?.groups?.id)) {
+              url = `https://www.pixiv.net/novel/show.php?id=${m.groups.id}`
+            }
+            // There are also `twitter/` link, since its href is just a valid URL, we don't need to handle it
+          }
+          return <a href={url}>{attrs.children || []}</a>
+        },
+      })}
+    </>
+  )
+}