Add multi controller support!

src/index.js

@@ -1,35 +1,37 @@
 const m = ['b', 'a', 'y', 'x', 'l', 'r'];
 
-class Unswitch {
-  constructor(s) {
-    this.a = 8;
-    this.b = {};
-    this.c = {};
-    for (let i = 0; i < m.length; i += 1) {
-      this.b[m[i]] = { p: false };
-    }
-    Object.assign(this.c, s);
+function Unswitch(s) {
+  this.a = 8;
+  this.b = {};
+  this.c = {};
+  for (let i = 0; i < m.length; i += 1) {
+    this.b[m[i]] = { p: false };
   }
-
-  update() {
-    const pad = navigator.getGamepads()[0];
-    if (pad === null) return;
-    const { buttons, axes } = pad;
-    for (let i = 0; i < m.length; i += 1) {
-      const button = m[i];
-      if (this.b[button].p !== buttons[i].pressed && this.c[button]) {
-        this.b[button].p = buttons[i].pressed;
-        this.c[button](this.b[button].p);
+  Object.assign(this.c, s);
+  this.update = () => {
+    const gamepads = navigator.getGamepads();
+    for (let i = 0; i < Object.keys(gamepads).length; i += 1) {
+      if (gamepads[i].id && gamepads[i].id.indexOf(this.c.side) !== -1) {
+        const pad = gamepads[i];
+        const { buttons, axes } = pad;
+        for (let j = 0; j < m.length; j += 1) {
+          const button = m[j];
+          if (this.b[button].p !== buttons[j].pressed && this.c[button]) {
+            this.b[button].p = buttons[j].pressed;
+            this.c[button](this.b[button].p);
+          }
+        }
+        if (this.c.axes) {
+          const position = Math.round(axes[9] / (2 / 7) + 3.5);
+          if (position !== this.a) {
+            this.c.axes(position);
+            this.a = position;
+          }
+        }
+        break;
       }
     }
-    if (this.c.axes) {
-      const position = Math.round(axes[9] / (2 / 7) + 3.5);
-      if (position !== this.a) {
-        this.c.axes(position);
-        this.a = position;
-      }
-    }
-  }
+  };
 }
 
 export default Unswitch;