feat(cli): support ctrl+d to exit (#878)

Similar to ctrl+c, ctrl+d can now be used to exit the program. To avoid accidental exit, ctrl+d must be pressed twice in relatively quick succession (same as ctrl+c).

Following common UX pattern, ctrl+d will be ignored when the input prompt is non-empty. This behavior is similar to how most shell (bash/zsh) behaves. To support this, I had to refactor so that text buffer is initialized outside of the InputPrompt component and instead do it on the main App component to allow input controller to have access to check the content of the text buffer.

packages/cli/src/ui/components/InputPrompt.tsx

@@ -4,15 +4,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import * as fs from 'fs';
 import React, { useCallback, useEffect, useState } from 'react';
-import { Text, Box, useInput, useStdin } from 'ink';
+import { Text, Box, useInput } from 'ink';
 import { Colors } from '../colors.js';
 import { SuggestionsDisplay } from './SuggestionsDisplay.js';
 import { useInputHistory } from '../hooks/useInputHistory.js';
-import { useTextBuffer, cpSlice, cpLen } from './shared/text-buffer.js';
+import { cpSlice, cpLen, TextBuffer } from './shared/text-buffer.js';
 import chalk from 'chalk';
-import { useTerminalSize } from '../hooks/useTerminalSize.js';
 import stringWidth from 'string-width';
 import process from 'node:process';
 import { useCompletion } from '../hooks/useCompletion.js';
@@ -21,60 +19,36 @@ import { SlashCommand } from '../hooks/slashCommandProcessor.js';
 import { Config } from '@gemini-cli/core';
 
 export interface InputPromptProps {
+  buffer: TextBuffer;
   onSubmit: (value: string) => void;
   userMessages: readonly string[];
   onClearScreen: () => void;
   config: Config; // Added config for useCompletion
   slashCommands: SlashCommand[]; // Added slashCommands for useCompletion
   placeholder?: string;
-  height?: number; // Visible height of the editor area
   focus?: boolean;
-  widthFraction: number;
+  inputWidth: number;
+  suggestionsWidth: number;
   shellModeActive: boolean;
   setShellModeActive: (value: boolean) => void;
 }
 
 export const InputPrompt: React.FC<InputPromptProps> = ({
+  buffer,
   onSubmit,
   userMessages,
   onClearScreen,
   config,
   slashCommands,
   placeholder = '  Type your message or @path/to/file',
-  height = 10,
   focus = true,
-  widthFraction,
+  inputWidth,
+  suggestionsWidth,
   shellModeActive,
   setShellModeActive,
 }) => {
-  const terminalSize = useTerminalSize();
-  const padding = 3;
-  const effectiveWidth = Math.max(
-    20,
-    Math.round(terminalSize.columns * widthFraction) - padding,
-  );
-  const suggestionsWidth = Math.max(60, Math.floor(terminalSize.columns * 0.8));
-
   const [justNavigatedHistory, setJustNavigatedHistory] = useState(false);
 
-  const { stdin, setRawMode } = useStdin();
-
-  const isValidPath = useCallback((filePath: string): boolean => {
-    try {
-      return fs.existsSync(filePath) && fs.statSync(filePath).isFile();
-    } catch (_e) {
-      return false;
-    }
-  }, []);
-
-  const buffer = useTextBuffer({
-    initialText: '',
-    viewport: { height, width: effectiveWidth },
-    stdin,
-    setRawMode,
-    isValidPath,
-  });
-
   const completion = useCompletion(
     buffer.text,
     config.getTargetDir(),
@@ -370,11 +344,10 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
           ) : (
             linesToRender.map((lineText, visualIdxInRenderedSet) => {
               const cursorVisualRow = cursorVisualRowAbsolute - scrollVisualRow;
-              let display = cpSlice(lineText, 0, effectiveWidth);
+              let display = cpSlice(lineText, 0, inputWidth);
               const currentVisualWidth = stringWidth(display);
-              if (currentVisualWidth < effectiveWidth) {
-                display =
-                  display + ' '.repeat(effectiveWidth - currentVisualWidth);
+              if (currentVisualWidth < inputWidth) {
+                display = display + ' '.repeat(inputWidth - currentVisualWidth);
               }
 
               if (visualIdxInRenderedSet === cursorVisualRow) {
@@ -394,7 +367,7 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
                       cpSlice(display, relativeVisualColForHighlight + 1);
                   } else if (
                     relativeVisualColForHighlight === cpLen(display) &&
-                    cpLen(display) === effectiveWidth
+                    cpLen(display) === inputWidth
                   ) {
                     display = display + chalk.inverse(' ');
                   }