fix: CJK backspace, remove ANSI-clear rerender that caused hang

Author: wisdomqin

src/cli/input.ts

@@ -142,8 +142,14 @@ export class CliInput extends EventEmitter {
         // Backspace
         if (chunk === "\x7f" || chunk === "\b") {
             if (this.buffer.length > 0) {
+                const removed = this.buffer.slice(-1);
                 this.buffer = this.buffer.slice(0, -1);
-                process.stdout.write("\b \b");
+                // CJK and other wide characters take 2 terminal columns
+                if (this.isWideChar(removed)) {
+                    process.stdout.write("\b \b\b \b");
+                } else {
+                    process.stdout.write("\b \b");
+                }
             }
             return;
         }
@@ -259,4 +265,24 @@ export class CliInput extends EventEmitter {
     showInputPrompt(): void {
         this.showPrompt();
     }
+
+    /** Check if a character is full-width (CJK, emoji, etc.) */
+    private isWideChar(ch: string): boolean {
+        const code = ch.codePointAt(0) ?? 0;
+        return (
+            (code >= 0x1100 && code <= 0x115f) ||  // Hangul Jamo
+            (code >= 0x2e80 && code <= 0x303e) ||  // CJK Radicals
+            (code >= 0x3040 && code <= 0x33bf) ||  // Japanese
+            (code >= 0x3400 && code <= 0x4dbf) ||  // CJK Unified Extension A
+            (code >= 0x4e00 && code <= 0x9fff) ||  // CJK Unified
+            (code >= 0xa960 && code <= 0xa97c) ||  // Hangul Jamo Extended-A
+            (code >= 0xac00 && code <= 0xd7a3) ||  // Hangul Syllables
+            (code >= 0xf900 && code <= 0xfaff) ||  // CJK Compatibility
+            (code >= 0xfe30 && code <= 0xfe6b) ||  // CJK Compatibility Forms
+            (code >= 0xff01 && code <= 0xff60) ||  // Fullwidth Forms
+            (code >= 0xffe0 && code <= 0xffe6) ||  // Fullwidth Signs
+            (code >= 0x1f000 && code <= 0x1fbff) || // Emoji & Symbols
+            (code >= 0x20000 && code <= 0x2ffff)    // CJK Extension B+
+        );
+    }
 }

src/index.ts

@@ -123,27 +123,23 @@ async function main() {
     workspaceDir,
     callbacks: {
       onAssistantText: (text) => {
-        // Called when streaming is complete — render markdown
         spinner.stop();
         if (text.trim() === "HEARTBEAT_OK") return;
 
         if (streamingStarted) {
-          // We already streamed raw text, now re-render with markdown
-          // Clear the streamed output and replace with rendered version
-          process.stdout.write("\r\x1b[J"); // clear from cursor
-          process.stdout.write("\n");
+          // Text was already streamed to terminal, just finish with newline
+          process.stdout.write("\n\n");
+        } else {
+          // Non-streamed response (e.g. short tool-only reply): render with markdown
+          const rendered = renderMarkdown(text);
+          process.stdout.write(chalk.green("🦐 ") + rendered + "\n");
         }
-
-        // Render markdown for pretty display
-        const rendered = renderMarkdown(text);
-        process.stdout.write(chalk.green("🦐 ") + rendered + "\n");
         streamingStarted = false;
       },
       onTextChunk: (chunk) => {
-        // Streaming: show raw text as it arrives
         spinner.stop();
         if (!streamingStarted) {
-          process.stdout.write(chalk.green("🦐 "));
+          process.stdout.write(chalk.green("\n🦐 "));
           streamingStarted = true;
         }
         process.stdout.write(chunk);