feat(baoyu-post-to-wechat,baoyu-post-to-weibo,baoyu-post-to-x): cascade Mermaid PNG preprocessing into publishing pipelines

skills/baoyu-post-to-weibo/scripts/md-to-html.ts

@@ -8,6 +8,7 @@ import {
   extractTitleFromMarkdown,
   parseFrontmatter,
   pickFirstString,
+  preprocessMermaidInMarkdown,
   renderMarkdownDocument,
   replaceMarkdownImagesWithPlaceholders,
   resolveColorToken,
@@ -16,6 +17,7 @@ import {
   serializeFrontmatter,
   stripWrappingQuotes,
 } from "baoyu-md";
+import { closeRenderer, renderMermaidToPng } from "baoyu-chrome-cdp/mermaid";
 
 interface ImageInfo {
   placeholder: string;
@@ -69,8 +71,27 @@ export async function parseMarkdown(
     || pickFirstString(frontmatter, ["featureImage", "cover_image", "coverImage", "cover", "image"])
     || null;
 
+  const { markdown: mermaidProcessedBody, images: mermaidImages } =
+    await preprocessMermaidInMarkdown(body, {
+      baseDir,
+      renderFn: renderMermaidToPng,
+      onError: (error, block) => {
+        const message = error instanceof Error ? error.message : String(error);
+        console.error(
+          `[md-to-html] mermaid render failed (${block.code.slice(0, 40).replace(/\s+/g, " ")}…): ${message}`,
+        );
+      },
+    });
+
+  if (mermaidImages.length > 0) {
+    const fresh = mermaidImages.filter((image) => !image.cached).length;
+    console.error(
+      `[md-to-html] mermaid: ${mermaidImages.length} block(s), ${fresh} rendered, ${mermaidImages.length - fresh} cached`,
+    );
+  }
+
   const { images, markdown: rewrittenBody } = replaceMarkdownImagesWithPlaceholders(
-    body,
+    mermaidProcessedBody,
     "WBIMGPH_",
   );
   const rewrittenMarkdown = `${serializeFrontmatter(frontmatter)}${rewrittenBody}`;
@@ -163,8 +184,12 @@ Options:
 }
 
 if (import.meta.main ?? (process.argv[1] && path.resolve(process.argv[1]) === path.resolve(import.meta.filename ?? ""))) {
-  await main().catch((error) => {
+  try {
+    await main();
+  } catch (error) {
     console.error(`Error: ${error instanceof Error ? error.message : String(error)}`);
-    process.exit(1);
-  });
+    process.exitCode = 1;
+  } finally {
+    await closeRenderer();
+  }
 }