Remove MCI cache and xxhash dependency

The MCI cache is no longer needed as we no longer rely on DSR/CPR

core/art.js

@@ -15,7 +15,6 @@ const paths     = require('path');
 const assert    = require('assert');
 const iconv     = require('iconv-lite');
 const _         = require('lodash');
-const xxhash    = require('xxhash');
 
 exports.getArt                          = getArt;
 exports.getArtFromPath                  = getArtFromPath;
@@ -251,7 +250,6 @@ function display(client, art, options, cb) {
     }
 
     options.mciReplaceChar = options.mciReplaceChar || ' ';
-    options.disableMciCache = options.disableMciCache || false;
 
     //  :TODO: this is going to be broken into two approaches controlled via options:
     //  1) Standard - use internal tracking of locations for MCI -- no CPR's/etc.
@@ -272,45 +270,7 @@ function display(client, art, options, cb) {
         startRow        : options.startRow,
     });
 
-    let parseComplete = false;
-    let mciMap;
-    const mciCprQueue = [];
-    let artHash;
-    let mciMapFromCache;
-
-    function completed() {
-
-        if(!options.disableMciCache && !mciMapFromCache) {
-            //  cache our MCI findings...
-            client.mciCache[artHash] = mciMap;
-            client.log.trace( { artHash : artHash.toString(16), mciMap : mciMap }, 'Added MCI map to cache');
-        }
-
-        ansiParser.removeAllListeners();    //  :TODO: Necessary???
-
-        const extraInfo = {
-            height : ansiParser.row - 1,
-        };
-
-        return cb(null, mciMap, extraInfo);
-    }
-
-    if(!options.disableMciCache) {
-        artHash = xxhash.hash(Buffer.from(art), 0xCAFEBABE);
-
-        //  see if we have a mciMap cached for this art
-        if(client.mciCache) {
-            mciMap  = client.mciCache[artHash];
-        }
-    }
-
-    if(mciMap) {
-        mciMapFromCache = true;
-        client.log.trace( { artHash : artHash.toString(16), mciMap : mciMap }, 'Loaded MCI map from cache');
-    } else {
-        //  no cached MCI info
-        mciMap = {};
-
+    const mciMap = {};
     let generatedId = 100;
 
     ansiParser.on('mci', mciInfo => {
@@ -337,17 +297,18 @@ function display(client, art, options, cb) {
         }
 
     });
-    }
 
     ansiParser.on('literal', literal => client.term.write(literal, false) );
     ansiParser.on('control', control => client.term.rawWrite(control) );
 
     ansiParser.on('complete', () => {
-        parseComplete = true;
+        ansiParser.removeAllListeners();
 
-        if(0 === mciCprQueue.length) {
-            return completed();
-        }
+        const extraInfo = {
+            height : ansiParser.row - 1,
+        };
+
+        return cb(null, mciMap, extraInfo);
     });
 
     let initSeq = '';

package.json

@@ -58,7 +58,6 @@
     "uuid": "8.3.2",
     "uuid-parse": "1.1.0",
     "ws": "7.4.3",
-    "xxhash": "^0.3.0",
     "yazl": "^2.5.1"
   },
   "devDependencies": {