Add enhanced Markdown to LinkedIn conversion and X thread splitter

2026-04-29 23:28:28 +02:00
parent a7db8ef418
commit 834451f33b
6 changed files with 417 additions and 55 deletions
@@ -0,0 +1,115 @@
+import { transformText } from "./formatter";
+
+function stripUnsupportedMarkdown(text: string): string {
+    return text
+        .replace(/!\[[^\]]*\]\([^)]+\)/g, "")
+        .replace(/\[([^\]]+)\]\(([^)]+)\)/g, "$1 ($2)")
+        .replace(/~~(.+?)~~/g, "$1")
+        .replace(/`(.+?)`/g, "$1");
+}
+
+function applyInlineMarkdown(text: string): string {
+    return text.replace(
+        /\*\*\*(.+?)\*\*\*|\*\*(.+?)\*\*|_(.+?)_/g,
+        (_match: string, boldItalic: string | undefined, bold: string | undefined, italic: string | undefined) => {
+            if (boldItalic !== undefined) return transformText(boldItalic, "bold-italic");
+            if (bold !== undefined) return transformText(bold, "bold");
+            return transformText(italic!, "italic");
+        }
+    );
+}
+
+export function markdownToLinkedIn(text: string): string {
+    const processed = stripUnsupportedMarkdown(text);
+    const lines = processed.split("\n");
+    const output: string[] = [];
+    let pendingBlanks = 0;
+    let skipNextBlanks = false;
+    let inListContext = false;
+
+    for (const line of lines) {
+        if (line.trim() === "") {
+            if (!skipNextBlanks) pendingBlanks++;
+            continue;
+        }
+
+        skipNextBlanks = false;
+
+        if (line.startsWith("# ")) {
+            for (let i = 0; i < pendingBlanks; i++) output.push("");
+            pendingBlanks = 0;
+            inListContext = false;
+            const headingText = line.slice(2).toUpperCase();
+            output.push(transformText(applyInlineMarkdown(headingText), "bold") + "  ");
+            skipNextBlanks = true;
+            continue;
+        }
+
+        if (line.startsWith("## ")) {
+            for (let i = 0; i < pendingBlanks; i++) output.push("");
+            pendingBlanks = 0;
+            inListContext = false;
+            const headingText = line.slice(3);
+            output.push(transformText(applyInlineMarkdown(headingText), "bold") + "  ");
+            skipNextBlanks = true;
+            continue;
+        }
+
+        const hMatch = line.match(/^#{3,6}\s/);
+        if (hMatch) {
+            for (let i = 0; i < pendingBlanks; i++) output.push("");
+            pendingBlanks = 0;
+            inListContext = false;
+            const headingText = line.slice(hMatch[0].length);
+            output.push(transformText(applyInlineMarkdown(headingText), "bold") + "  ");
+            skipNextBlanks = true;
+            continue;
+        }
+
+        if (line.startsWith("> ")) {
+            for (let i = 0; i < pendingBlanks; i++) output.push("");
+            pendingBlanks = 0;
+            inListContext = false;
+            output.push(transformText(applyInlineMarkdown(line.slice(2)), "italic"));
+            continue;
+        }
+
+        if (line.startsWith("- ") || line.startsWith("* ")) {
+            if (!inListContext) {
+                for (let i = 0; i < pendingBlanks; i++) output.push("");
+            }
+            pendingBlanks = 0;
+            output.push("— " + applyInlineMarkdown(line.slice(2)) + "  ");
+            inListContext = true;
+            continue;
+        }
+
+        const orderedMatch = line.match(/^(\d+)[.)]\s+(.+)/);
+        if (orderedMatch) {
+            if (!inListContext) {
+                for (let i = 0; i < pendingBlanks; i++) output.push("");
+            }
+            pendingBlanks = 0;
+            const num = orderedMatch[1]!;
+            const content = orderedMatch[2]!;
+            output.push(`${num}/ ${applyInlineMarkdown(content)}  `);
+            inListContext = true;
+            continue;
+        }
+
+        if (/^-{3,}$/.test(line.trim()) || /^\*{3,}$/.test(line.trim())) {
+            for (let i = 0; i < pendingBlanks; i++) output.push("");
+            pendingBlanks = 0;
+            inListContext = false;
+            output.push("");
+            continue;
+        }
+
+        for (let i = 0; i < pendingBlanks; i++) output.push("");
+        pendingBlanks = 0;
+        inListContext = false;
+        output.push(applyInlineMarkdown(line));
+    }
+
+    return output.join("\n").replace(/[ \u00A0]\./g, ".").trimEnd();
+}