Diffusion Ant (feature/nursery) Code

ant/examples/tui/mouse.js
ddfe6237cab5feature/nursery

mouse.js
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			const ESC = '\x1b';
			const CSI = `${ESC}[`;

			const codes = {
			altScreenOn: `${CSI}?1049h`,
			altScreenOff: `${CSI}?1049l`,
			hideCursor: `${CSI}?25l`,
			showCursor: `${CSI}?25h`,
			clear: `${CSI}2J`,
			home: `${CSI}H`,
			reset: `${CSI}0m`,
			mouseOn: `${CSI}?1000h${CSI}?1006h`,
			mouseOff: `${CSI}?1000l${CSI}?1006l`
			};

			const state = {
			x: 0,
			y: 0,
			button: 'none',
			action: 'move',
			lastEvent: ''
			};

			function write(text) {
			process.stdout.write(text);
			}

			function render() {
			const width = process.stdout.columns \|\| 80;
			const height = process.stdout.rows \|\| 24;
			const lines = [];

			lines.push(' Simple Mouse TUI');
			lines.push('');
			lines.push(` Position: ${state.x}, ${state.y}`);
			lines.push(` Button: ${state.button}`);
			lines.push(` Action: ${state.action}`);
			lines.push('');
			lines.push(' Last event:');
			lines.push(` ${state.lastEvent \|\| 'none'}`);
			lines.push('');
			lines.push(' Move or click in the terminal. Press q or Ctrl-C to exit.');

			while (lines.length < height) {
			lines.push('');
			}

			const padded = lines.map(line => {
			if (line.length >= width) return line.slice(0, width);
			return line + ' '.repeat(width - line.length);
			});

			write(codes.home + codes.clear + padded.join('\n') + codes.reset);
			}

			function parseMouseEvent(seq) {
			const match = seq.match(/^\x1b\[<([0-9]+);([0-9]+);([0-9]+)([mM])$/);
			if (!match) return false;

			const [, codeStr, xStr, yStr, action] = match;
			const code = Number(codeStr);
			const x = Number(xStr);
			const y = Number(yStr);
			const buttonCode = code & 3;

			let button = 'none';
			if (buttonCode === 0) button = 'left';
			if (buttonCode === 1) button = 'middle';
			if (buttonCode === 2) button = 'right';

			let actionLabel = 'move';
			if (action === 'M' && (code & 32) === 0) actionLabel = 'press';
			if (action === 'm') actionLabel = 'release';

			state.x = x;
			state.y = y;
			state.button = button;
			state.action = actionLabel;
			state.lastEvent = `code=${code} x=${x} y=${y} action=${action}`;
			return true;
			}

			function handleInput(chunk) {
			const str = chunk.toString();
			if (str === 'q' \|\| str === '\x03') {
			cleanup();
			return;
			}

			if (str.startsWith('\x1b[<')) {
			if (parseMouseEvent(str)) {
			render();
			return;
			}
			}
			}

			function cleanup() {
			process.stdin.setRawMode(false);
			process.stdin.pause();
			process.stdin.removeListener('data', handleInput);
			process.stdout.removeListener('resize', render);
			write(codes.mouseOff + codes.showCursor + codes.altScreenOff);
			process.exit(0);
			}

			function start() {
			if (process.stdin.isTTY) {
			process.stdin.setRawMode(true);
			}
			process.stdin.resume();
			process.stdin.on('data', handleInput);
			process.stdout.on('resize', render);

			write(codes.altScreenOn + codes.hideCursor + codes.mouseOn);
			render();
			}

			process.on('SIGINT', cleanup);
			process.on('SIGTERM', cleanup);

			start();

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