From 71f281b208e71014fa61c23a943b1b326272556e Mon Sep 17 00:00:00 2001
From: Holden Rohrer <hr@hrhr.dev>
Date: Sat, 18 Jan 2020 17:26:33 -0500
Subject: jarvis externalized identify()

---
 examples/jarvis.js | 27 ++-------------------------
 utils/ident.js     | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 25 deletions(-)
 create mode 100644 utils/ident.js

diff --git a/examples/jarvis.js b/examples/jarvis.js
index 2c39385..a8373ce 100644
--- a/examples/jarvis.js
+++ b/examples/jarvis.js
@@ -9,11 +9,12 @@ const comb = require('../utils/comb');
 const Search = require('../tools/search');
 const sched = require('../tools/schedule');
 const ri = require('../utils/rectintersect');
+const id = require('../utils/ident');
 
 //// Basic handling on open and close of the socket
 var main = new Socket();
 
-main.on('open', open);
+id(main, initOnce, init);
 main.on('close', deinit);
 
 //// tileUpdates require knowledge of the prog's identity (sender)
@@ -37,30 +38,6 @@ function initOnce(){
 var funcs = [protectArea, detectPrompt];
 
 //// Management utilities
-// "Pings" the server with a cursor location which is then detected
-function open(){
-  console.log('socket opened');
-  let coords = [Math.floor(Math.random()*100000+16),Math.floor(Math.random()*100000+16)];
-  main.cursor(coords);
-  main.on('cursor', detect);
-  function detect(pos, send){
-    if (vec.equals(pos[0],coords)){
-      main.off('cursor', detect);
-      identity(send);
-    }
-  }
-}
-
-// identity records the identity discovered from the cursor and calls configurable init and initOnce functions
-var initialized = false; //"Initialize once" strategy
-function identity(send){
-  console.log('identity activated');
-  if (! initialized){
-    initialized = true;
-    initOnce();
-  }
-  init(send);
-}
 
 // When a tile changes, processes data into usable form and runs every function in `funcs` w/ that data.
 // Note that functions can edit inputs
diff --git a/utils/ident.js b/utils/ident.js
new file mode 100644
index 0000000..6d18b88
--- /dev/null
+++ b/utils/ident.js
@@ -0,0 +1,29 @@
+// A portable script to find the sender when the server websocket opens (by cursor movement)
+
+module.exports = function identify(sock, initOnce, init){
+  // `sock` should be Socket instance.
+  // initOnce and init should be functions that act like they describe; initOnce runs once per program execution and init whenever the socket turns back on
+
+  sock.on('open', ()=>{
+    // "Pings" the server with a cursor location which is detected and saved by identity()
+    let coords = [Math.floor(Math.random()*100000+16), Math.floor(Math.random()*1000000+16)];
+    sock.cursor(coords);
+    sock.on('cursor', detect);
+    function detect(pos, send){
+      if (vec.equals(pos[0],coords)){
+        sock.off('cursor', detect);
+        identity(send);
+      }
+    }
+  }
+
+  // Calls initOnce and init on successful identification.
+  let initialized = false;
+  function identity(send){
+    if (! initialized){
+      initialized = true;
+      initOnce();
+    }
+    init(send);
+  }
+}
-- 
cgit