Transform keymap to hotkey map and warn about duplicates

Issue #1283

src/components/Shortcuts/generateHotkeys.js

@@ -0,0 +1,15 @@
+export default keymap => {
+    const hotkeys = {};
+
+    for (const hotkey of Object.values(keymap)) {
+        if (hotkeys[hotkey]) {
+            // eslint-disable-next-line max-len
+            console.warn(`There exist multiple definition for key combination "${hotkey}"`);
+        }
+
+        const bucket = [];
+        hotkeys[hotkey] = bucket;
+    }
+
+    return hotkeys;
+};

src/components/Shortcuts/generateHotkeys.test.js

@@ -0,0 +1,49 @@
+/* eslint-env mocha */
+import chai, { expect } from 'chai';
+import sinon from 'sinon';
+import sinonChai from 'sinon-chai';
+
+chai.use(sinonChai);
+
+import generateHotkeys from './generateHotkeys';
+
+describe('generateHotkeys', () => {
+    it('should return an object', () => {
+        const hotkeys = generateHotkeys({});
+
+        expect(hotkeys).to.be.an('object');
+    });
+
+    it('should transform a key map to a map of hotkeys', () => {
+        const keymap = {
+            COMBO_A: 'ctrl+a',
+            COMBO_B: 'ctrl+b'
+        };
+
+        const hotkeys = generateHotkeys(keymap);
+
+        expect(hotkeys).to.deep.equal({
+            'ctrl+a': [],
+            'ctrl+b': []
+        });
+    });
+
+    it('should warn about duplicate keys', () => {
+        const warn = sinon.spy(console, 'warn');
+
+        try {
+            const keymap = {
+                COMBO_1: 'ctrl+a',
+                COMBO_2: 'ctrl+a'
+            };
+
+            generateHotkeys(keymap);
+
+            expect(warn).to.have.been.called;
+        } catch (error) {
+            throw error;
+        } finally {
+            warn.restore();
+        }
+    });
+});