feat(ask): add preview pane and wrapped content

src/text.ts

@@ -0,0 +1,100 @@
+import { visibleWidth } from "@mariozechner/pi-tui";
+
+export function wrapText(text: string, width: number): string[] {
+	const effectiveWidth = Math.max(1, width);
+	const lines: string[] = [];
+	const paragraphs = text.split("\n");
+
+	for (const paragraph of paragraphs) {
+		if (paragraph.length === 0) {
+			lines.push("");
+			continue;
+		}
+
+		const leadingWhitespace = paragraph.match(/^\s*/)?.[0] ?? "";
+		const body = paragraph.slice(leadingWhitespace.length).trim();
+		if (!body) {
+			lines.push(leadingWhitespace);
+			continue;
+		}
+
+		const wrapped = wrapParagraph(
+			body,
+			effectiveWidth - visibleWidth(leadingWhitespace),
+		);
+		if (wrapped.length === 0) {
+			lines.push(leadingWhitespace);
+			continue;
+		}
+
+		for (const [index, part] of wrapped.entries()) {
+			lines.push(
+				index === 0
+					? `${leadingWhitespace}${part}`
+					: `${leadingWhitespace}${part}`,
+			);
+		}
+	}
+
+	return lines.length > 0 ? lines : [""];
+}
+
+function wrapParagraph(text: string, width: number): string[] {
+	const effectiveWidth = Math.max(1, width);
+	const words = text.split(/\s+/).filter(Boolean);
+	const lines: string[] = [];
+	let current = "";
+
+	for (const word of words) {
+		if (!current) {
+			if (visibleWidth(word) <= effectiveWidth) {
+				current = word;
+			} else {
+				lines.push(...breakLongWord(word, effectiveWidth));
+			}
+			continue;
+		}
+
+		const candidate = `${current} ${word}`;
+		if (visibleWidth(candidate) <= effectiveWidth) {
+			current = candidate;
+			continue;
+		}
+
+		lines.push(current);
+		if (visibleWidth(word) <= effectiveWidth) {
+			current = word;
+		} else {
+			lines.push(...breakLongWord(word, effectiveWidth));
+			current = "";
+		}
+	}
+
+	if (current) {
+		lines.push(current);
+	}
+
+	return lines;
+}
+
+function breakLongWord(word: string, width: number): string[] {
+	const effectiveWidth = Math.max(1, width);
+	const chunks: string[] = [];
+	let current = "";
+
+	for (const char of Array.from(word)) {
+		const candidate = `${current}${char}`;
+		if (visibleWidth(candidate) > effectiveWidth && current) {
+			chunks.push(current);
+			current = char;
+			continue;
+		}
+		current = candidate;
+	}
+
+	if (current) {
+		chunks.push(current);
+	}
+
+	return chunks;
+}