Handle OSC and ascii

src/ansi.test.ts

@@ -424,3 +424,61 @@ test("handles only ANSI codes with no text", () => {
   // Opens and closes span even with no text
   expect(result).toBe('<span style="color:#f85149"></span>');
 });
+
+// OSC sequences (Operating System Command)
+test("strips OSC terminal title with BEL", () => {
+  // ESC ] 0 ; title BEL
+  const result = ansiToHtml("\x1b]0;My Terminal Title\x07text after");
+  expect(result).toBe("text after");
+});
+
+test("strips OSC terminal title with ST", () => {
+  // ESC ] 0 ; title ESC \
+  const result = ansiToHtml("\x1b]0;My Terminal Title\x1b\\text after");
+  expect(result).toBe("text after");
+});
+
+test("strips OSC with emoji in title", () => {
+  const result = ansiToHtml("\x1b]0;★ Claude Code\x07hello");
+  expect(result).toBe("hello");
+});
+
+test("strips multiple OSC sequences", () => {
+  const result = ansiToHtml("\x1b]0;title1\x07text\x1b]0;title2\x07more");
+  expect(result).toBe("textmore");
+});
+
+// Private mode sequences (DEC)
+test("strips bracketed paste mode enable", () => {
+  // ESC [ ? 2004 h
+  const result = ansiToHtml("\x1b[?2004htext");
+  expect(result).toBe("text");
+});
+
+test("strips bracketed paste mode disable", () => {
+  // ESC [ ? 2004 l
+  const result = ansiToHtml("\x1b[?2004ltext");
+  expect(result).toBe("text");
+});
+
+test("strips mixed private mode and SGR", () => {
+  const result = ansiToHtml("\x1b[?2004h\x1b[31mred\x1b[0m\x1b[?2004l");
+  expect(result).toBe('<span style="color:#f85149">red</span>');
+});
+
+test("strips cursor visibility sequences", () => {
+  // ESC [ ? 25 h (show cursor) and ESC [ ? 25 l (hide cursor)
+  const result = ansiToHtml("\x1b[?25lhidden cursor\x1b[?25h");
+  expect(result).toBe("hidden cursor");
+});
+
+test("handles Claude Code typical output", () => {
+  // Simulated Claude Code startup with title, bracketed paste, and colors
+  const input =
+    "\x1b]0;★ Claude Code\x07\x1b[?2004h\x1b[1;33mClaude Code\x1b[0m v2.1.15\x1b[?2004l";
+  const result = ansiToHtml(input);
+  expect(result).toContain("Claude Code");
+  expect(result).toContain("v2.1.15");
+  expect(result).not.toContain("2004");
+  expect(result).not.toContain("]0;");
+});

src/ansi.ts

@@ -189,18 +189,41 @@ export function ansiToHtml(text: string): string {
 
   while (i < text.length) {
     // Check for ESC character (char code 27)
-    if (text.charCodeAt(i) === 27 && text[i + 1] === "[") {
-      // Parse CSI sequence: ESC [ params command
+    if (text.charCodeAt(i) === 27) {
+      // OSC sequence: ESC ] ... BEL or ESC ] ... ESC \
+      // Used for terminal title, hyperlinks, etc.
+      if (text[i + 1] === "]") {
+        let j = i + 2;
+        // Skip until BEL (0x07) or ST (ESC \)
+        while (j < text.length) {
+          if (text.charCodeAt(j) === 0x07) {
+            j++;
+            break;
+          }
+          if (text.charCodeAt(j) === 27 && text[j + 1] === "\\") {
+            j += 2;
+            break;
+          }
+          j++;
+        }
+        i = j;
+        continue;
+      }
+
+      // CSI sequence: ESC [ params command
+      if (text[i + 1] === "[") {
         let j = i + 2;
         let params = "";
-      while (j < text.length && /[0-9;]/.test(text[j] || "")) {
+        // Include ? for private mode sequences like ESC[?2004h (bracketed paste)
+        while (j < text.length && /[0-9;?]/.test(text[j] || "")) {
           params += text[j];
           j++;
         }
         const command = text[j] || "";
         j++;
 
-      if (command === "m") {
+        // Only process SGR (m command) for styling, skip others (cursor, clear, etc.)
+        if (command === "m" && !params.includes("?")) {
           // SGR - Select Graphic Rendition
           const codes = params ? params.split(";").map(Number) : [0];
           for (let k = 0; k < codes.length; k++) {
@@ -241,11 +264,16 @@ export function ansiToHtml(text: string): string {
 
           applyStyle();
         }
-      // Skip other escape sequences (H, f, J, K, etc.) - they don't affect our line-based output
+        // Skip all CSI sequences (SGR handled above, others like cursor/clear ignored)
         i = j;
         continue;
       }
 
+      // Unknown ESC sequence - skip the ESC character
+      i++;
+      continue;
+    }
+
     // Track newlines in the content
     if (text[i] === "\n" || text[i] === "\r") {
       if (text[i] === "\n") {

src/seed.ts

@@ -12,9 +12,13 @@ initDb();
 
 const existing = getDeviceBySecret(secret);
 if (existing) {
-	console.log(`device already exists: id=${existing.id} secret=${existing.secret} name=${existing.name}`);
+  console.log(
+    `device already exists: id=${existing.id} secret=${existing.secret} name=${existing.name}`,
+  );
   process.exit(0);
 }
 
 const device = createDevice(secret, name);
-console.log(`created device: id=${device.id} secret=${device.secret} name=${device.name}`);
+console.log(
+  `created device: id=${device.id} secret=${device.secret} name=${device.name}`,
+);