add command discovery

lights.js

@@ -42,9 +42,13 @@ let functions = {
   constant: (index, args, prev) => { return args; },
   modulo: (index, args, prev) => { return prev % args; },
   move: (index, args, prev) => { targets[args] = prev; return prev; },
-  swap: (index, args, prev) => { let temp = targets[args]; targets[args] = prev; return temp; }
+  swap: (index, args, prev) => { let temp = targets[args]; targets[args] = prev; return temp; },
+  add: (index, args, prev) => { return prev + args; },
+  subtract: (index, args, prev) => { return prev - args; }
 }
 
+export functions;
+
 function tick_pattern() {
   // do the parsing stuff here
   log.debug("TICKING PATTERN")

server.js

@@ -1,4 +1,5 @@
 import * as net from 'net';
+import { functions } from './lights.js'
 
 const hostname = '0.0.0.0';
 const port = 29999;
@@ -9,6 +10,7 @@ export function recv(callback, errorCallback) {
     server.on('connection', (con) => {
       console.log('connection recieved: ' +
         con.remoteAddress + ":" + con.remotePort);
+      con.write(JSON.stringify(Object.keys(functions)));
       con.on('data', (data) => {
         callback(data);
       });