enigma-bbs/core/client_term.js

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/* jslint node: true */
'use strict';
// ENiGMA½
var Log = require('./logger.js').log;
var enigmaToAnsi = require('./color_codes.js').enigmaToAnsi;
var renegadeToAnsi = require('./color_codes.js').renegadeToAnsi;
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var iconv = require('iconv-lite');
var assert = require('assert');
var _ = require('lodash');
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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;
var termClient = 'unknown';
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// 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');
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}
}
});
Object.defineProperty(this, 'termType', {
get : function() {
return termType;
},
set : function(ttype) {
termType = ttype.toLowerCase();
if(this.isANSI()) {
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this.outputEncoding = 'cp437';
} else {
// :TODO: See how x84 does this -- only set if local/remote are binary
this.outputEncoding = 'utf8';
}
// :TODO: according to this: http://mud-dev.wikidot.com/article:telnet-client-identification
// Windows telnet will send "VTNT". If so, set termClient='windows'
// there are some others on the page as well
Log.debug( { encoding : this.outputEncoding }, 'Set output encoding due to terminal type change');
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}
});
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;
}
}
});
Object.defineProperty(this, 'termClient', {
get : function() {
return termClient;
},
set : function(tc) {
termClient = tc;
Log.debug( { termClient : this.termClient }, 'Set known terminal client');
}
});
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}
ClientTerminal.prototype.disconnect = function() {
this.output = null;
};
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ClientTerminal.prototype.isANSI = function() {
//
// ANSI terminals should be encoded to CP437
//
// Some terminal types provided by Mercyful Fate / Enthral:
// ANSI-BBS
// PC-ANSI
// QANSI
// SCOANSI
// VT100
// QNX
//
// Reports from various terminals
//
// syncterm:
// * SyncTERM
//
// xterm:
// * PuTTY
//
// ansi-bbs:
// * fTelnet
//
// screen:
// * ConnectBot (Android)
//
// linux:
// * JuiceSSH (note: TERM=linux also)
//
// :TODO: Others??
return [ 'ansi', 'pc-ansi', 'ansi-bbs', 'qansi', 'scoansi', 'syncterm' ].indexOf(this.termType) > -1;
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};
// :TODO: probably need to update these to convert IAC (0xff) -> IACIAC (escape it)
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ClientTerminal.prototype.write = function(s, convertLineFeeds, cb) {
this.rawWrite(this.encode(s, convertLineFeeds), cb);
};
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ClientTerminal.prototype.rawWrite = function(s, cb) {
if(this.output) {
this.output.write(s, function written(err) {
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if(_.isFunction(cb)) {
cb(err);
} else if(err) {
Log.warn('Failed writing to socket: ' + err.toString());
}
});
}
};
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ClientTerminal.prototype.pipeWrite = function(s, spec, cb) {
spec = spec || 'renegade';
var conv = {
enigma : enigmaToAnsi,
renegade : renegadeToAnsi,
}[spec] || enigmaToAnsi;
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this.write(conv(s, this), null, cb); // null = use default for |convertLineFeeds|
};
ClientTerminal.prototype.encode = function(s, convertLineFeeds) {
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convertLineFeeds = _.isBoolean(convertLineFeeds) ? convertLineFeeds : this.convertLF;
if(convertLineFeeds && _.isString(s)) {
s = s.replace(/\n/g, '\r\n');
}
return iconv.encode(s, this.outputEncoding);
};