enigma-bbs/core/client_term.js

/* jslint node: true */
'use strict';

//	ENiGMA½
var Log			= require('./logger.js').log;

var iconv		= require('iconv-lite');
var assert		= require('assert');
var _			= require('lodash');

iconv.extendNodeEncodings();

exports.ClientTerminal	= ClientTerminal;

function ClientTerminal(output) {
	this.output		= output;

	var self = this;

	var outputEncoding = 'cp437';
	assert(iconv.encodingExists(outputEncoding));

	//	convert line feeds such as \n -> \r\n
	this.convertLF		= true;

	//
	//	Some terminal we handle specially
	//	They can also be found in this.env{}
	//
	var termType		= 'unknown';
	var termHeight		= 0;
	var termWidth		= 0;

	//	Raw values set by e.g. telnet NAWS, ENVIRONMENT, etc.
	this.env			= {};

	Object.defineProperty(this, 'outputEncoding', {
		get : function() {
			return outputEncoding;
		},
		set : function(enc) {
			if(iconv.encodingExists(enc)) {
				outputEncoding = enc;
			} else {
				Log.warn({ encoding : enc }, 'Unknown encoding');
			}
		}
	});

	Object.defineProperty(this, 'termType', {
		get : function() {
			return termType;
		},
		set : function(ttype) {
			termType = ttype.toLowerCase();

			//
			//	ANSI terminals should be encoded to CP437
			//
			//	Some terminal types provided by Mercyful Fate / Enthral:
			//	ANSI-BBS
			//	PC-ANSI
			//	QANSI
			//	SCOANSI
			//	VT100
			//	XTERM
			//	LINUX
			//	QNX
			//	SCREEN
			//
			if(this.isANSI()) {
				this.outputEncoding = 'cp437';
			} else {
				//	:TODO: See how x84 does this -- only set if local/remote are binary
				this.outputEncoding = 'utf8';
			}

			Log.debug( { encoding : this.outputEncoding }, 'Set output encoding due to terminal type change');
		}
	});

	Object.defineProperty(this, 'termWidth', {
		get : function() {
			return termWidth;
		},
		set : function(width) {
			if(width > 0) {
				termWidth = width;
			}
		}
	});

	Object.defineProperty(this, 'termHeight', {
		get : function() {
			return termHeight;
		},
		set : function(height) {
			if(height > 0) {
				termHeight = height;
			}
		}
	});
}

ClientTerminal.prototype.isANSI = function() {
	//	:TODO: Others??
	return [ 'ansi', 'pc-ansi', 'qansi', 'scoansi' ].indexOf(this.termType) > -1;
};

ClientTerminal.prototype.write = function(s, convertLineFeeds) {
	convertLineFeeds = _.isUndefined(convertLineFeeds) ? this.convertLF : convertLineFeeds;
	if(convertLineFeeds && _.isString(s)) {
		s = s.replace(/\n/g, '\r\n');
	}
	this.output.write(iconv.encode(s, this.outputEncoding));
};