* Introduce MCI cache: Art files are hashed and MCI info (per client) is cached. Term resizes invalidate the cache

* Bring in farmhash for art file hashing (and perhaps other uses soon)
* Re-write of art.js display(). Better system, use MCI cache, etc.
* Update package.json engines node req.

core/art.js

@@ -7,6 +7,7 @@ var miscUtil	= require('./misc_util.js');
 var ansi		= require('./ansi_term.js');
 var aep			= require('./ansi_escape_parser.js');
 var sauce		= require('./sauce.js');
+const farmhash	= require('farmhash');
 
 //	deps
 var fs			= require('fs');
@@ -225,10 +226,157 @@ function defaultEofFromExtension(ext) {
 	return SUPPORTED_ART_TYPES[ext.toLowerCase()].eof;
 }
 
-//	:TODO: change to display(art, options, cb)
-//	cb(err, mci)
+//	:TODO: Implement the following
+//	* Pause (disabled | termHeight | keyPress )
+//	* Cancel (disabled | <keys> )
+//	* Resume from pause -> continous (disabled | <keys>)
+function display(client, art, options, cb) {
+	if(_.isFunction(options) && !cb) {
+		cb = options;
+		options = {};
+	}
 
-function display(options, cb) {
+	if(!art || !art.length) {
+		return cb(new Error('Empty art'));
+	}
+
+	options.mciReplaceChar 	= options.mciReplaceChar || ' ';
+	options.disableMciCache	= options.disableMciCache || false;  
+
+	if(!_.isBoolean(options.iceColors)) {
+		//	try to detect from SAUCE
+		if(_.has(options, 'sauce.ansiFlags') && (options.sauce.ansiFlags & (1 << 0))) {
+			options.iceColors = true;
+		}
+	}
+
+	const ansiParser = new aep.ANSIEscapeParser({
+		mciReplaceChar	: options.mciReplaceChar,
+		termHeight		: client.term.termHeight,
+		termWidth		: client.term.termWidth,
+		trailingLF		: options.trailingLF,
+	});
+
+	let parseComplete = false;
+	let cprListener;
+	let mciMap;
+	const mciCprQueue = [];
+	let artHash;
+
+	function completed() {
+		if(cprListener) {
+			client.removeListener('cursor position report', cprListener);
+		}
+
+		if(!options.disableMciCache) {
+			//	cache our MCI findings...
+			client.mciCache[artHash] = mciMap;
+		}
+
+		ansiParser.removeAllListeners();	//	:TODO: Necessary???
+
+		const extraInfo = {
+			height : ansiParser.row - 1,
+		};
+
+		return cb(null, mciMap, extraInfo);
+	}
+
+
+	if(!options.disableMciCache) {		
+		artHash	= farmhash.hash32(art);
+
+		//	see if we have a mciMap cached for this art
+		if(client.mciCache) {
+			mciMap	= client.mciCache[artHash];
+		}
+	}
+
+	if(!mciMap) {
+		//	no cached MCI info
+		mciMap = {};
+
+		cprListener = function(pos) {
+			if(mciCprQueue.length > 0) {
+				mciMap[mciCprQueue.shift()].position = pos;
+
+				if(parseComplete && 0 === mciCprQueue.length) {					
+					return completed();
+				}
+			}
+		};
+
+		client.on('cursor position report', cprListener);
+
+		let generatedId = 100;
+
+		ansiParser.on('mci', mciInfo => {
+			//	:TODO: ensure generatedId's do not conflict with any existing |id|
+			const id		= _.isNumber(mciInfo.id) ? mciInfo.id : generatedId;
+			const mapKey	= `${mciInfo.mci}${id}`;
+			const mapEntry	= mciMap[mapKey];
+
+			if(mapEntry) {
+				mapEntry.focusSGR	= mciInfo.SGR;
+				mapEntry.focusArgs	= mciInfo.args;
+			} else {
+				mciMap[mapKey] = {
+					args	: mciInfo.args,
+					SGR		: mciInfo.SGR,
+					code	: mciInfo.mci,
+					id		: id,
+				};
+
+				if(!mciInfo.id) {
+					++generatedId;
+				}
+
+				mciCprQueue.push(mapKey);
+				client.term.write(ansi.queryPos(), false);
+			}
+
+		});
+	}
+
+	ansiParser.on('literal', literal => client.term.write(literal, false) );	
+	ansiParser.on('control', control => client.term.write(control, false) );
+
+	ansiParser.on('complete', () => {
+		parseComplete = true;
+
+		if(0 === mciCprQueue.length) {
+			return completed();
+		}		
+	});
+
+	let ansiFontSeq;
+	if(options.font) {
+		ansiFontSeq = ansi.setSyncTermFontWithAlias(options.font);
+	} else if(options.sauce) {
+		let fontName = getFontNameFromSAUCE(options.sauce);
+		if(fontName) {
+			fontName = ansi.getSyncTERMFontFromAlias(fontName);
+		}
+
+		//	don't set default (CP437) from SAUCE
+		if(fontName && 'cp437' !== fontName) {
+			ansiFontSeq = ansi.setSyncTERMFont(fontName);
+		}
+	}
+
+	if(ansiFontSeq) {
+		client.term.write(ansiFontSeq, false);
+	}
+
+	if(options.iceColors) {
+		client.term.write(ansi.blinkToBrightIntensity(), false);
+	}
+
+	ansiParser.reset(art);
+	ansiParser.parse();	
+}
+
+function displayBACKUP(options, cb) {
 	assert(_.isObject(options));
 	assert(_.isObject(options.client));
 	assert(!_.isUndefined(options.art));

core/client.js

@@ -82,6 +82,11 @@ function Client(input, output) {
 	this.lastKeyPressMs		= Date.now();
 	this.menuStack			= new MenuStack(this);
 	this.acs				= new ACS(this);
+	this.mciCache			= {};
+
+	this.clearMciCache = function() {
+		this.mciCache = {};
+	};
 
 	Object.defineProperty(this, 'node', {
 		get : function() {

core/client_term.js

@@ -150,11 +150,13 @@ ClientTerminal.prototype.write = function(s, convertLineFeeds, cb) {
 
 ClientTerminal.prototype.rawWrite = function(s, cb) {
 	if(this.output) {
-		this.output.write(s, function written(err) {
-			if(_.isFunction(cb)) {
-				cb(err);
-			} else if(err) {
-				Log.warn('Failed writing to socket: ' + err.toString());
+		this.output.write(s, err => {
+			if(cb) {
+				return cb(err);
+			}
+			
+			if(err) {
+				Log.warn( { error : err.message }, 'Failed writing to socket');
 			}
 		});
 	}

core/servers/ssh.js

@@ -149,6 +149,8 @@ function SSHClient(clientConn) {
 		if(termHeight > 0 && termWidth > 0) {
 			self.term.termHeight = termHeight;
 			self.term.termWidth	= termWidth;
+
+			self.clearMciCache();	//	term size changes = invalidate cache
 		}
 
 		if(_.isString(info.term) && info.term.length > 0 && 'unknown' === self.term.termType) {

core/servers/telnet.js

@@ -599,9 +599,11 @@ TelnetClient.prototype.handleSbCommand = function(evt) {
 				self.setTermType(evt.envVars[name]);
 			} else if('COLUMNS' === name && 0 === self.term.termWidth) {
 				self.term.termWidth = parseInt(evt.envVars[name]);
+				self.clearMciCache();	//	term size changes = invalidate cache
 				self.log.debug({ termWidth : self.term.termWidth, source : 'NEW-ENVIRON'}, 'Window width updated');
 			} else if('ROWS' === name && 0 === self.term.termHeight) {
 				self.term.termHeight = parseInt(evt.envVars[name]);
+				self.clearMciCache();	//	term size changes = invalidate cache
 				self.log.debug({ termHeight : self.term.termHeight, source : 'NEW-ENVIRON'}, 'Window height updated');
 			} else {			
 				if(name in self.term.env) {
@@ -636,6 +638,8 @@ TelnetClient.prototype.handleSbCommand = function(evt) {
 			self.term.env.ROWS = evt.height;
 		}
 
+		self.clearMciCache();	//	term size changes = invalidate cache
+
 		self.log.debug({ termWidth : evt.width , termHeight : evt.height, source : 'NAWS' }, 'Window size updated');
 	} else {
 		self.log(evt, 'SB');

core/theme.js

@@ -455,6 +455,7 @@ function displayThemeArt(options, cb) {
 			cb(err);
 		} else {
 			//	:TODO: just use simple merge of options -> displayOptions
+			/*
 			var dispOptions = {
 				art				: artInfo.data,
 				sauce			: artInfo.sauce,
@@ -466,6 +467,16 @@ function displayThemeArt(options, cb) {
 			art.display(dispOptions, function displayed(err, mciMap, extraInfo) {
 				cb(err, { mciMap : mciMap, artInfo : artInfo, extraInfo : extraInfo } );
 			});
+			*/
+			const displayOpts = {
+				sauce		: artInfo.sauce,
+				font		: options.font,
+				trailingLF	: options.trailingLF,
+			};
+
+			art.display(options.client, artInfo.data, displayOpts, (err, mciMap, extraInfo) => {
+				return cb(err, { mciMap : mciMap, artInfo : artInfo, extraInfo : extraInfo } );
+			});
 		}
 	});
 }

package.json

@@ -31,9 +31,10 @@
     "string-format": "davidchambers/string-format#mini-language",
     "temp": "^0.8.3",
     "inquirer" : "^1.1.0",
-    "fs-extra" : "0.26.x"
+    "fs-extra" : "0.26.x",
+    "farmhash"  : "^1.2.0"
   },
   "engines": {
-    "node": ">=0.12.2"
+    "node": ">=4.2.0"
   }
 }