Method layoutText

packages/pi-tui/src/components/editor.ts:989–1075

(contentWidth: number)

	}

	private layoutText(contentWidth: number): LayoutLine[] {
		const layoutLines: LayoutLine[] = [];

		if (this.state.lines.length === 0 || (this.state.lines.length === 1 && this.state.lines[0] === "")) {
			// Empty editor
			layoutLines.push({
				text: "",
				hasCursor: true,
				cursorPos: 0,
			});
			return layoutLines;
		}

		// Process each logical line
		for (let i = 0; i < this.state.lines.length; i++) {
			const line = this.state.lines[i] || "";
			const isCurrentLine = i === this.state.cursorLine;
			const lineVisibleWidth = visibleWidth(line);

			if (lineVisibleWidth <= contentWidth) {
				// Line fits in one layout line
				if (isCurrentLine) {
					layoutLines.push({
						text: line,
						hasCursor: true,
						cursorPos: this.state.cursorCol,
					});
				} else {
					layoutLines.push({
						text: line,
						hasCursor: false,
					});
				}
			} else {
				// Line needs wrapping - use word-aware wrapping
				const chunks = wordWrapLine(line, contentWidth, [...this.segment(line, "grapheme")]);

				for (let chunkIndex = 0; chunkIndex < chunks.length; chunkIndex++) {
					const chunk = chunks[chunkIndex];
					if (!chunk) continue;

					const cursorPos = this.state.cursorCol;
					const isLastChunk = chunkIndex === chunks.length - 1;

					// Determine if cursor is in this chunk
					// For word-wrapped chunks, we need to handle the case where
					// cursor might be in trimmed whitespace at end of chunk
					let hasCursorInChunk = false;
					let adjustedCursorPos = 0;

					if (isCurrentLine) {
						if (isLastChunk) {
							// Last chunk: cursor belongs here if >= startIndex
							hasCursorInChunk = cursorPos >= chunk.startIndex;
							adjustedCursorPos = cursorPos - chunk.startIndex;
						} else {
							// Non-last chunk: cursor belongs here if in range [startIndex, endIndex)
							// But we need to handle the visual position in the trimmed text