Return a stream of all keypresses if no key is specified, closes #2

Author: raquelxmoss

README.md

@@ -35,9 +35,10 @@ const drivers = {
 function main({Keys}) { // Your amazing main function }
 ```
 
-- Call `Keys.presses` with the name of the key for which you'd like a stream of presses. Currently, Cycle Keys supports inputting keys as strings only
+- Call `Keys.presses` without any arguments to get a stream of all keypresses. You can also call `presses` with the name of a key to only get keypresses for that key. Currently, Cycle Keys supports inputting keys as strings only
 
 ```js```
+const allKeypresses$ = Keys.presses();
 const esc$ = Keys.presses('esc');
 const shift$ = Keys.presses('shift');
 ```

src/keys-driver.js

@@ -5,11 +5,15 @@ export function makeKeysDriver () {
   return function keysDriver() {
     return {
       presses (key) {
-        const code = keycode(key);
+        let keypress$ = Observable.fromEvent(document.body, 'keypress');
 
-        return Observable
-          .fromEvent(document.body, 'keypress')
-          .filter(ev => ev.keyCode === code);
+        if (key) {
+          const code = keycode(key);
+
+          keypress$ = keypress$.filter(event => event.keyCode === code);
+        }
+
+        return keypress$;
       }
     }
   }

test/keys-test.js

@@ -5,6 +5,26 @@ import simulant from 'simulant';
 
 describe("makeKeysDriver", () => {
   describe("presses", () => {
+    it("returns a stream of all keypresses", () => {
+      const sources = makeKeysDriver()();
+
+      const keyCodes = [74, 75, 76];
+      let keypressEvents;
+
+      sources.presses().take(3).toArray().subscribe((events) => {
+        keypressEvents = events.map(event => event.keyCode);
+      });
+
+
+      keyCodes.forEach(function (keyCode) {
+        const event = simulant('keypress', {keyCode});
+
+        simulant.fire(document.body, event);
+      });
+
+      assert.deepEqual(keypressEvents, keyCodes, 'keycodes match given keys');
+    });
+
     it("returns a stream of keypress events for the given key", (done) => {
       const sources = makeKeysDriver()();