feat: box prompt (#363)

Author: 43081j

.changeset/shy-ideas-shout.md

@@ -0,0 +1,5 @@
+---
+"@clack/prompts": minor
+---
+
+Added new `box` prompt for rendering boxed text, similar a note.

packages/prompts/src/box.ts

@@ -0,0 +1,128 @@
+import type { Writable } from 'node:stream';
+import { getColumns } from '@clack/core';
+import wrap from 'wrap-ansi';
+import {
+	type CommonOptions,
+	S_BAR,
+	S_BAR_END,
+	S_BAR_END_RIGHT,
+	S_BAR_H,
+	S_BAR_START,
+	S_BAR_START_RIGHT,
+	S_CORNER_BOTTOM_LEFT,
+	S_CORNER_BOTTOM_RIGHT,
+	S_CORNER_TOP_LEFT,
+	S_CORNER_TOP_RIGHT,
+} from './common.js';
+
+export type BoxAlignment = 'left' | 'center' | 'right';
+
+type BoxSymbols = [topLeft: string, topRight: string, bottomLeft: string, bottomRight: string];
+
+const roundedSymbols: BoxSymbols = [
+	S_CORNER_TOP_LEFT,
+	S_CORNER_TOP_RIGHT,
+	S_CORNER_BOTTOM_LEFT,
+	S_CORNER_BOTTOM_RIGHT,
+];
+const squareSymbols: BoxSymbols = [S_BAR_START, S_BAR_START_RIGHT, S_BAR_END, S_BAR_END_RIGHT];
+
+export interface BoxOptions extends CommonOptions {
+	contentAlign?: BoxAlignment;
+	titleAlign?: BoxAlignment;
+	width?: number | 'auto';
+	titlePadding?: number;
+	contentPadding?: number;
+	rounded?: boolean;
+	includePrefix?: boolean;
+	formatBorder?: (text: string) => string;
+}
+
+function getPaddingForLine(
+	lineLength: number,
+	innerWidth: number,
+	padding: number,
+	contentAlign: BoxAlignment | undefined
+): [number, number] {
+	let leftPadding = padding;
+	let rightPadding = padding;
+	if (contentAlign === 'center') {
+		leftPadding = Math.floor((innerWidth - lineLength) / 2);
+	} else if (contentAlign === 'right') {
+		leftPadding = innerWidth - lineLength - padding;
+	}
+
+	rightPadding = innerWidth - leftPadding - lineLength;
+
+	return [leftPadding, rightPadding];
+}
+
+const defaultFormatBorder = (text: string) => text;
+
+export const box = (message = '', title = '', opts?: BoxOptions) => {
+	const output: Writable = opts?.output ?? process.stdout;
+	const columns = getColumns(output);
+	const borderWidth = 1;
+	const borderTotalWidth = borderWidth * 2;
+	const titlePadding = opts?.titlePadding ?? 1;
+	const contentPadding = opts?.contentPadding ?? 2;
+	const width = opts?.width === undefined || opts.width === 'auto' ? 1 : Math.min(1, opts.width);
+	const linePrefix = opts?.includePrefix ? `${S_BAR} ` : '';
+	const formatBorder = opts?.formatBorder ?? defaultFormatBorder;
+	const symbols = (opts?.rounded ? roundedSymbols : squareSymbols).map(formatBorder);
+	const hSymbol = formatBorder(S_BAR_H);
+	const vSymbol = formatBorder(S_BAR);
+	const maxBoxWidth = columns - linePrefix.length;
+	let boxWidth = Math.floor(columns * width) - linePrefix.length;
+	if (opts?.width === 'auto') {
+		const lines = message.split('\n');
+		let longestLine = title.length + titlePadding * 2;
+		for (const line of lines) {
+			const lineWithPadding = line.length + contentPadding * 2;
+			if (lineWithPadding > longestLine) {
+				longestLine = lineWithPadding;
+			}
+		}
+		const longestLineWidth = longestLine + borderTotalWidth;
+		if (longestLineWidth < boxWidth) {
+			boxWidth = longestLineWidth;
+		}
+	}
+	if (boxWidth % 2 !== 0) {
+		if (boxWidth < maxBoxWidth) {
+			boxWidth++;
+		} else {
+			boxWidth--;
+		}
+	}
+	const innerWidth = boxWidth - borderTotalWidth;
+	const maxTitleLength = innerWidth - titlePadding * 2;
+	const truncatedTitle =
+		title.length > maxTitleLength ? `${title.slice(0, maxTitleLength - 3)}...` : title;
+	const [titlePaddingLeft, titlePaddingRight] = getPaddingForLine(
+		truncatedTitle.length,
+		innerWidth,
+		titlePadding,
+		opts?.titleAlign
+	);
+	const wrappedMessage = wrap(message, innerWidth - contentPadding * 2, {
+		hard: true,
+		trim: false,
+	});
+	output.write(
+		`${linePrefix}${symbols[0]}${hSymbol.repeat(titlePaddingLeft)}${truncatedTitle}${hSymbol.repeat(titlePaddingRight)}${symbols[1]}\n`
+	);
+	const wrappedLines = wrappedMessage.split('\n');
+	for (const line of wrappedLines) {
+		const [leftLinePadding, rightLinePadding] = getPaddingForLine(
+			line.length,
+			innerWidth,
+			contentPadding,
+			opts?.contentAlign
+		);
+		output.write(
+			`${linePrefix}${vSymbol}${' '.repeat(leftLinePadding)}${line}${' '.repeat(rightLinePadding)}${vSymbol}\n`
+		);
+	}
+	output.write(`${linePrefix}${symbols[2]}${hSymbol.repeat(innerWidth)}${symbols[3]}\n`);
+};

packages/prompts/src/common.ts

@@ -17,6 +17,8 @@ export const S_STEP_SUBMIT = unicodeOr('◇', 'o');
 export const S_BAR_START = unicodeOr('┌', 'T');
 export const S_BAR = unicodeOr('│', '|');
 export const S_BAR_END = unicodeOr('└', '—');
+export const S_BAR_START_RIGHT = unicodeOr('┐', 'T');
+export const S_BAR_END_RIGHT = unicodeOr('┘', '—');
 
 export const S_RADIO_ACTIVE = unicodeOr('●', '>');
 export const S_RADIO_INACTIVE = unicodeOr('○', ' ');
@@ -29,6 +31,8 @@ export const S_BAR_H = unicodeOr('─', '-');
 export const S_CORNER_TOP_RIGHT = unicodeOr('╮', '+');
 export const S_CONNECT_LEFT = unicodeOr('├', '+');
 export const S_CORNER_BOTTOM_RIGHT = unicodeOr('╯', '+');
+export const S_CORNER_BOTTOM_LEFT = unicodeOr('╰', '+');
+export const S_CORNER_TOP_LEFT = unicodeOr('╭', '+');
 
 export const S_INFO = unicodeOr('●', '•');
 export const S_SUCCESS = unicodeOr('◆', '*');

packages/prompts/src/index.ts

@@ -1,6 +1,7 @@
 export { type ClackSettings, isCancel, settings, updateSettings } from '@clack/core';
 
 export * from './autocomplete.js';
+export * from './box.js';
 export * from './common.js';
 export * from './confirm.js';
 export * from './group.js';