Ensure we only process 1 line at a time

Also debounce unknown cards, rather than processing them as fast as
possible.

player.js

@@ -85,20 +85,32 @@ function appendLog(message) {
   wss.broadcast(JSON.stringify(data));
 }
 
-tag_reader.stdout.on('data', (data) => {
+function processLine(data) {
   if (Date.now() / 1000 < debounce_until) {
     return;
   }
+
   last_tag = String(data).trim();
   console.log("[tag] " + last_tag);
+
+  // min 1 sec debounce
+  debounce_until = Date.now() / 1000 + 1;
+
   lookup(last_tag, function(action, wait_sec) {
     wait_sec = wait_sec || 1;
-    if (action) {
     debounce_until = Date.now() / 1000 + wait_sec;
+    if (action) {
       console.log(`[action] [${action}] for [${last_tag}]`);
       player.stdin.write(action + "\n");
     }
   });
+}
+
+tag_reader.stdout.on('data', (data) => {
+  var s = data.toString(), lines = s.split(/\n/g);
+  for (var i = 0, l = lines.length; i < l; i++) {
+    processLine(lines[i]);
+  }
 });
 
 tag_reader.stderr.on('data', (data) => {