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index.tsx
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index.tsx
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import React, {useState, useEffect} from 'react';
import {Text, useInput} from 'ink';
import chalk from 'chalk';
import type {Except} from 'type-fest';
export type Props = {
/**
* Text to display when `value` is empty.
*/
readonly placeholder?: string;
/**
* Listen to user's input. Useful in case there are multiple input components
* at the same time and input must be "routed" to a specific component.
*/
readonly focus?: boolean; // eslint-disable-line react/boolean-prop-naming
/**
* Replace all chars and mask the value. Useful for password inputs.
*/
readonly mask?: string;
/**
* Whether to show cursor and allow navigation inside text input with arrow keys.
*/
readonly showCursor?: boolean; // eslint-disable-line react/boolean-prop-naming
/**
* Highlight pasted text
*/
readonly highlightPastedText?: boolean; // eslint-disable-line react/boolean-prop-naming
/**
* Value to display in a text input.
*/
readonly value: string;
/**
* Function to call when value updates.
*/
readonly onChange: (value: string) => void;
/**
* Function to call when `Enter` is pressed, where first argument is a value of the input.
*/
readonly onSubmit?: (value: string) => void;
};
function TextInput({
value: originalValue,
placeholder = '',
focus = true,
mask,
highlightPastedText = false,
showCursor = true,
onChange,
onSubmit,
}: Props) {
const [state, setState] = useState({
cursorOffset: (originalValue || '').length,
cursorWidth: 0,
});
const {cursorOffset, cursorWidth} = state;
useEffect(() => {
setState(previousState => {
if (!focus || !showCursor) {
return previousState;
}
const newValue = originalValue || '';
if (previousState.cursorOffset > newValue.length - 1) {
return {
cursorOffset: newValue.length,
cursorWidth: 0,
};
}
return previousState;
});
}, [originalValue, focus, showCursor]);
const cursorActualWidth = highlightPastedText ? cursorWidth : 0;
const value = mask ? mask.repeat(originalValue.length) : originalValue;
let renderedValue = value;
let renderedPlaceholder = placeholder ? chalk.grey(placeholder) : undefined;
// Fake mouse cursor, because it's too inconvenient to deal with actual cursor and ansi escapes
if (showCursor && focus) {
renderedPlaceholder =
placeholder.length > 0
? chalk.inverse(placeholder[0]) + chalk.grey(placeholder.slice(1))
: chalk.inverse(' ');
renderedValue = value.length > 0 ? '' : chalk.inverse(' ');
let i = 0;
for (const char of value) {
renderedValue +=
i >= cursorOffset - cursorActualWidth && i <= cursorOffset
? chalk.inverse(char)
: char;
i++;
}
if (value.length > 0 && cursorOffset === value.length) {
renderedValue += chalk.inverse(' ');
}
}
useInput(
(input, key) => {
if (
key.upArrow ||
key.downArrow ||
(key.ctrl && input === 'c') ||
key.tab ||
(key.shift && key.tab)
) {
return;
}
if (key.return) {
if (onSubmit) {
onSubmit(originalValue);
}
return;
}
let nextCursorOffset = cursorOffset;
let nextValue = originalValue;
let nextCursorWidth = 0;
if (key.leftArrow) {
if (showCursor) {
nextCursorOffset--;
}
} else if (key.rightArrow) {
if (showCursor) {
nextCursorOffset++;
}
} else if (key.backspace || key.delete) {
if (cursorOffset > 0) {
nextValue =
originalValue.slice(0, cursorOffset - 1) +
originalValue.slice(cursorOffset, originalValue.length);
nextCursorOffset--;
}
} else {
nextValue =
originalValue.slice(0, cursorOffset) +
input +
originalValue.slice(cursorOffset, originalValue.length);
nextCursorOffset += input.length;
if (input.length > 1) {
nextCursorWidth = input.length;
}
}
if (cursorOffset < 0) {
nextCursorOffset = 0;
}
if (cursorOffset > originalValue.length) {
nextCursorOffset = originalValue.length;
}
setState({
cursorOffset: nextCursorOffset,
cursorWidth: nextCursorWidth,
});
if (nextValue !== originalValue) {
onChange(nextValue);
}
},
{isActive: focus},
);
return (
<Text>
{placeholder
? value.length > 0
? renderedValue
: renderedPlaceholder
: renderedValue}
</Text>
);
}
export default TextInput;
type UncontrolledProps = {
/**
* Initial value.
*/
readonly initialValue?: string;
} & Except<Props, 'value' | 'onChange'>;
export function UncontrolledTextInput({
initialValue = '',
...props
}: UncontrolledProps) {
const [value, setValue] = useState(initialValue);
return <TextInput {...props} value={value} onChange={setValue} />;
}