fix: add per-channel markdown table conversion (#1495) (thanks @odysseus0)

src/markdown/tables.ts

@@ -0,0 +1,34 @@
+import type { MarkdownTableMode } from "../config/types.base.js";
+import { markdownToIRWithMeta } from "./ir.js";
+import { renderMarkdownWithMarkers } from "./render.js";
+
+const MARKDOWN_STYLE_MARKERS = {
+  bold: { open: "**", close: "**" },
+  italic: { open: "_", close: "_" },
+  strikethrough: { open: "~~", close: "~~" },
+  code: { open: "`", close: "`" },
+  code_block: { open: "```\n", close: "```" },
+} as const;
+
+export function convertMarkdownTables(markdown: string, mode: MarkdownTableMode): string {
+  if (!markdown || mode === "off") return markdown;
+  const { ir, hasTables } = markdownToIRWithMeta(markdown, {
+    linkify: false,
+    autolink: false,
+    headingStyle: "none",
+    blockquotePrefix: "",
+    tableMode: mode,
+  });
+  if (!hasTables) return markdown;
+  return renderMarkdownWithMarkers(ir, {
+    styleMarkers: MARKDOWN_STYLE_MARKERS,
+    escapeText: (text) => text,
+    buildLink: (link, text) => {
+      const href = link.href.trim();
+      if (!href) return null;
+      const label = text.slice(link.start, link.end);
+      if (!label) return null;
+      return { start: link.start, end: link.end, open: "[", close: `](${href})` };
+    },
+  });
+}