node-cli.js

/**
 * Node.CLI
 * Original Author: SchizoDuckie
 * Updated by: Cory Gross, xkxx      
 * 
 * Super simple CLI for enhanced control over cursor position and color customization
 * to spice up your script's functionality and appearance in terminal/console windows.
 * Requires no dependencies. Instead utilizes Node.JS 'process' object to access stdout.
 *
 * ANSI escape codes are used. For details see: http://en.wikipedia.org/wiki/ANSI_escape_code
 *
 * Free to use and modify, enjoy!
 */

function NodeCli () {

	this.bold = true;
	this.colors = {
	  default: 39,
	  grey:    30,
	  red:     31,
	  green:   32,
	  yellow:  33,
	  blue:    34,
	  magenta: 35,
	  cyan:    36,
	  white:   37
	};
	this.bgcolors = {
	  default: 49,
	  gray:    40,
	  red:     41,
	  green:   42,
	  yellow:  43,
	  blue:    44,
	  magenta: 45,
	  cyan:    46,
	  white:   47,
	};
	this.textstyles = {
	  bold:        1,
	  underscore:  4,
	  blink:       5,
	  inverse:     7,
	  conceal:     8,
	  nobold:      22,
	  nounderscore:24,
	  noblink:     25,
	  noinverse:   27,
	  noconceal:   28,
	  frame:       51,
	  encircle:    52,
	  overline:    53,
	  no_frame_or_circle:54,
	  nooverline: 55
	}

	//Set colors and styles
	//Syntax: color, bold(boolean), background or: color, background, others...
	this.color = function(color, bold, background) {
		var output = this.colors[color];
		if(typeof bold == 'boolean') {
			output += (bold ? ';1' : '') + (background? ';'+this.bgcolors[background] : '');
		}
		else {
			output += bold ? ';'+this.bgcolors[bold] : '';
			for(var i = 2; i < arguments.length; i++) {
				output += ';' + (typeof arguments[i] == 'string' ? this.textstyles[arguments[i]] : arguments[i] + ';');
			}
		}
		return this.custom(output + 'm');
	};

	//Set background color only
	this.bgcolor = function(color) {
		return this.custom(this.bgcolors[color] + 'm');
	};

	//Set text styles only
	this.style = function(style) {
		return this.custom(this.textstyles[style] + 'm');
	};

	//Reset terminal to default attributes (colors, styles)
	this.reset = function() {
		return this.write('\x1B[0m');
	};

	//Reset terminal to default text color
	this.resetColor = function() {
		return this.write('\x1B[39m');
	};

	//Reset terminal to default background color
	this.resetBg = function() {
		return this.write('\x1B[49m');
	};

	//Reset terminal to all default text styles
	this.resetStyle = function() {
		return this.write('\x1B[10;22;23;24;25;27;28;29;54;55m');
	};
	
	//Output string @ current x/y
	this.write = function(string) {
		process.stdout.print(string);
		return(this);
	};

	//Output string at new line
	this.print = function(string) {
		process.stdout.puts(string);
		return(this);
	};
	
	//Position the Cursor to x/y
	this.move = function(x,y) {
		return this.custom(x+';'+y+'H');
	};
	
	//Move the cursor up x rows
	this.up = function(x) {
		return this.custom(x+'A');
	};

	//Move the cursor down x rows
	this.down = function(x) {
		return this.custom(x+'B');
	};

	//Move the cursor forward x rows
	this.fwd = function(x) {
		return this.custom(x+'C');
	};

	//Move the cursor backwards x columns
	this.back = function(x) {
		return this.custom(x+'D');
	};

	//Clear the entire screen
	this.clear = function(x) {
		return this.custom((x ? x : 2)+'J');
	};

	//Clear the current line
	this.clearLine = function(x) {
		return this.custom((x ? x : 2)+'K');
	};

	//Clear the next x chars, keep cursor positioned where it started
	this.clearNext = function(x) {
		return this.write(new Array(x+1).join(' ')).back(x);
	};

	//Customized commands
	this.custom = function(cmd) {
		return this.write('\x1B['+cmd);
	};

}

module.exports = new NodeCli();

//Reset console when program exits
process.on('exit', module.exports.reset);

//cli.clear().move(38, 5).write('Node.js').down(1).back(7).write('Rocks!');
module.exports.clear().move(20,20).color('red', true).write('Node.js').down(1).back(7).color('yellow', 'default', 'underscore').write('Rocks!').resetStyle().down(10);