fixing shortcut for composer

Author: igorcosta

src/ui/ink/AgentUI.tsx

@@ -235,8 +235,19 @@ export function AgentUI({
       return;
     }
 
-    // Handle Ctrl+C - first warns, second exits
+    // Handle Ctrl+C - clear input if non-empty, otherwise warn then exit
     if (key.ctrl && char === 'c') {
+      const currentInput = textBufferRef.current.getText();
+
+      if (currentInput.length > 0) {
+        // Clear the input on first Ctrl+C when there's text
+        textBufferRef.current.setText('');
+        syncInputFromBuffer();
+        setCtrlCCount(0);
+        return;
+      }
+
+      // Input is empty - handle exit flow
       if (ctrlCCount === 0) {
         setCtrlCCount(1);
         onCtrlC();

tests/ui/ink/AgentUI.test.ts

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, expect, it } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
 import type { Key as InkKey } from 'ink';
 import { TextBuffer } from '../../../src/ui/textBuffer.js';
 import {
@@ -80,3 +80,52 @@ describe('AgentUI layout stability', () => {
     expect(getComposerHelpLine(true, '70% context left', '? shortcuts · / commands')).toBe(' ');
   });
 });
+
+describe('AgentUI Ctrl+C behavior', () => {
+  it('clears input when Ctrl+C is pressed with non-empty text', () => {
+    const buffer = new TextBuffer(80, 10, 'hello world');
+    const onCtrlC = vi.fn();
+
+    // Simulate the Ctrl+C handler logic from AgentUI
+    const currentInput = buffer.getText();
+
+    if (currentInput.length > 0) {
+      // Should clear the input
+      buffer.setText('');
+      onCtrlC();
+    }
+
+    expect(buffer.getText()).toBe('');
+    expect(onCtrlC).toHaveBeenCalled();
+  });
+
+  it('does not trigger exit flow when Ctrl+C is pressed with non-empty text', () => {
+    const buffer = new TextBuffer(80, 10, 'some typed text');
+    let exitCalled = false;
+
+    // Simulate the Ctrl+C handler logic from AgentUI
+    const currentInput = buffer.getText();
+
+    if (currentInput.length > 0) {
+      // Should clear the input, NOT go to exit flow
+      buffer.setText('');
+    } else {
+      // Exit flow only when input is empty
+      exitCalled = true;
+    }
+
+    expect(buffer.getText()).toBe('');
+    expect(exitCalled).toBe(false);
+  });
+
+  it('preserves multi-line content until Ctrl+C clears it', () => {
+    const buffer = new TextBuffer(80, 10, 'line1\nline2\nline3');
+
+    expect(buffer.getText()).toBe('line1\nline2\nline3');
+
+    // Simulate Ctrl+C clearing
+    buffer.setText('');
+
+    expect(buffer.getText()).toBe('');
+  });
+});