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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { useTextBuffer } from './text-buffer.js';
import chalk from 'chalk';
import { Box, Text, useInput, useStdin, Key } from 'ink';
import React from 'react';
import { useTerminalSize } from '../../hooks/useTerminalSize.js';
import { Colors } from '../../colors.js';
export interface MultilineTextEditorProps {
// Initial contents.
readonly initialText?: string;
// Placeholder text.
readonly placeholder?: string;
// Visible width.
readonly width?: number;
// Visible height.
readonly height?: number;
// Called when the user submits (plain <Enter> key).
readonly onSubmit?: (text: string) => void;
// Capture keyboard input.
readonly focus?: boolean;
// Called when the internal text buffer updates.
readonly onChange?: (text: string) => void;
// Called when the user attempts to navigate past the start of the editor
// with the up arrow.
readonly navigateUp?: () => void;
// Called when the user attempts to navigate past the end of the editor
// with the down arrow.
readonly navigateDown?: () => void;
// Called on all key events to allow the caller. Returns true if the
// event was handled and should not be passed to the editor.
readonly inputPreprocessor?: (input: string, key: Key) => boolean;
// Optional initial cursor position (character offset)
readonly initialCursorOffset?: number;
readonly widthUsedByParent: number;
readonly widthFraction?: number;
}
export const MultilineTextEditor = ({
initialText = '',
placeholder = '',
width,
height = 10,
onSubmit,
focus = true,
onChange,
initialCursorOffset,
widthUsedByParent,
widthFraction = 1,
navigateUp,
navigateDown,
inputPreprocessor,
}: MultilineTextEditorProps): React.ReactElement => {
const terminalSize = useTerminalSize();
const effectiveWidth = Math.max(
20,
width ??
Math.round(terminalSize.columns * widthFraction) - widthUsedByParent,
);
const { stdin, setRawMode } = useStdin();
const buffer = useTextBuffer({
initialText,
initialCursorOffset,
viewport: { height, width: effectiveWidth },
stdin,
setRawMode,
onChange, // Pass onChange to the hook
});
useInput(
(input, key) => {
if (!focus) {
return;
}
if (inputPreprocessor?.(input, key) === true) {
return;
}
const isCtrlX =
(key.ctrl && (input === 'x' || input === '\x18')) || input === '\x18';
const isCtrlE =
(key.ctrl && (input === 'e' || input === '\x05')) ||
input === '\x05' ||
(!key.ctrl &&
input === 'e' &&
input.length === 1 &&
input.charCodeAt(0) === 5);
if (isCtrlX || isCtrlE) {
buffer.openInExternalEditor();
return;
}
if (
process.env['TEXTBUFFER_DEBUG'] === '1' ||
process.env['TEXTBUFFER_DEBUG'] === 'true'
) {
console.log('[MultilineTextEditor] event', { input, key });
}
if (input.startsWith('[') && input.endsWith('u')) {
const m = input.match(/^\[([0-9]+);([0-9]+)u$/);
if (m && m[1] === '13') {
const mod = Number(m[2]);
const hasCtrl = Math.floor(mod / 4) % 2 === 1;
if (hasCtrl) {
if (onSubmit) {
onSubmit(buffer.text);
}
} else {
buffer.newline();
}
return;
}
}
if (input.startsWith('[27;') && input.endsWith('~')) {
const m = input.match(/^\[27;([0-9]+);13~$/);
if (m) {
const mod = Number(m[1]);
const hasCtrl = Math.floor(mod / 4) % 2 === 1;
if (hasCtrl) {
if (onSubmit) {
onSubmit(buffer.text);
}
} else {
buffer.newline();
}
return;
}
}
if (input === '\n') {
buffer.newline();
return;
}
if (input === '\r') {
if (onSubmit) {
onSubmit(buffer.text);
}
return;
}
if (key.upArrow) {
if (buffer.cursor[0] === 0 && navigateUp) {
navigateUp();
return;
}
}
if (key.downArrow) {
if (buffer.cursor[0] === buffer.lines.length - 1 && navigateDown) {
navigateDown();
return;
}
}
buffer.handleInput(input, key as Record<string, boolean>);
},
{ isActive: focus },
);
const visibleLines = buffer.visibleLines;
const [cursorRow, cursorCol] = buffer.cursor;
const [scrollRow, scrollCol] = buffer.scroll;
return (
<Box flexDirection="column">
{buffer.text.length === 0 && placeholder ? (
<Text color={Colors.SubtleComment}>{placeholder}</Text>
) : (
visibleLines.map((lineText, idx) => {
const absoluteRow = scrollRow + idx;
let display = lineText.slice(scrollCol, scrollCol + effectiveWidth);
if (display.length < effectiveWidth) {
display = display.padEnd(effectiveWidth, ' ');
}
if (absoluteRow === cursorRow) {
const relativeCol = cursorCol - scrollCol;
const highlightCol = relativeCol;
if (highlightCol >= 0 && highlightCol < effectiveWidth) {
const charToHighlight = display[highlightCol] || ' ';
const highlighted = chalk.inverse(charToHighlight);
display =
display.slice(0, highlightCol) +
highlighted +
display.slice(highlightCol + 1);
} else if (relativeCol === effectiveWidth) {
display =
display.slice(0, effectiveWidth - 1) + chalk.inverse(' ');
}
}
return <Text key={idx}>{display}</Text>;
})
)}
</Box>
);
};
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