initial commit

app/node_modules/single-line-log/index.js

@@ -0,0 +1,51 @@
+var MOVE_LEFT = new Buffer('1b5b3130303044', 'hex').toString();
+var MOVE_UP = new Buffer('1b5b3141', 'hex').toString();
+var CLEAR_LINE = new Buffer('1b5b304b', 'hex').toString();
+var stringWidth = require('string-width');
+
+module.exports = function(stream) {
+	var write = stream.write;
+	var str;
+
+	stream.write = function(data) {
+		if (str && data !== str) str = null;
+		return write.apply(this, arguments);
+	};
+
+	if (stream === process.stderr || stream === process.stdout) {
+		process.on('exit', function() {
+			if (str !== null) stream.write('');
+		});
+	}
+
+	var prevLineCount = 0;
+	var log = function() {
+		str = '';
+		var nextStr = Array.prototype.join.call(arguments, ' ');
+
+		// Clear screen
+		for (var i=0; i<prevLineCount; i++) {
+			str += MOVE_LEFT + CLEAR_LINE + (i < prevLineCount-1 ? MOVE_UP : '');
+		}
+
+		// Actual log output
+		str += nextStr;
+		stream.write(str);
+
+		// How many lines to remove on next clear screen
+		var prevLines = nextStr.split('\n');
+		prevLineCount = 0;
+		for (var i=0; i < prevLines.length; i++) {
+			prevLineCount += Math.ceil(stringWidth(prevLines[i]) / stream.columns) || 1;
+		}
+	};
+
+	log.clear = function() {
+		stream.write('');
+	};
+
+	return log;
+};
+
+module.exports.stdout = module.exports(process.stdout);
+module.exports.stderr = module.exports(process.stderr);