Restructure Redux store directory tree

Following the plan outlined in #687, restructure the Redux store as
follows:

 - Move the entry point from `services/annotation-ui.js` to `store/index.js`
 - Move the modules which define bundles of reducers, action creators
   and selectors to `store/modules/{module-name}.js`
 - Move related utility code to `store/{module-name}.js`

src/sidebar/components/test/sidebar-content-test.js

@@ -56,7 +56,7 @@ describe('sidebar.components.sidebar-content', function () {
 
   before(function () {
     angular.module('h', [])
-      .service('annotationUI', require('../../services/annotation-ui'))
+      .service('annotationUI', require('../../store'))
       .component('sidebarContent', proxyquire('../sidebar-content',
         noCallThru({
           angular: angular,

src/sidebar/index.js

@@ -184,9 +184,10 @@ module.exports = angular.module('h', [
   .directive('spinner', require('./directive/spinner'))
   .directive('windowScroll', require('./directive/window-scroll'))
 
+  .service('annotationUI', require('./store'))
+
   .service('analytics', require('./services/analytics'))
   .service('annotationMapper', require('./services/annotation-mapper'))
-  .service('annotationUI', require('./services/annotation-ui'))
   .service('api', require('./services/api'))
   .service('apiRoutes', require('./services/api-routes'))
   .service('auth', require('./services/oauth-auth'))

src/sidebar/services/test/annotation-mapper-test.js

@@ -21,7 +21,7 @@ describe('annotationMapper', function() {
     };
     angular.module('app', [])
       .service('annotationMapper', require('../annotation-mapper'))
-      .service('annotationUI', require('../annotation-ui'))
+      .service('annotationUI', require('../../store'))
       .value('api', fakeApi)
       .value('settings', {});
     angular.mock.module('app');

src/sidebar/services/annotation-ui.js → src/sidebar/store/index.js

@@ -37,15 +37,15 @@ var redux = require('redux');
 var thunk = require('redux-thunk').default;
 
 var reducers = require('../reducers');
-var annotationsReducer = require('../reducers/annotations');
-var framesReducer = require('../reducers/frames');
-var linksReducer = require('../reducers/links');
-var selectionReducer = require('../reducers/selection');
-var sessionReducer = require('../reducers/session');
-var viewerReducer = require('../reducers/viewer');
-var util = require('../reducers/util');
+var annotationsReducer = require('./modules/annotations');
+var framesReducer = require('./modules/frames');
+var linksReducer = require('./modules/links');
+var selectionReducer = require('./modules/selection');
+var sessionReducer = require('./modules/session');
+var viewerReducer = require('./modules/viewer');
+var util = require('./util');
 
-var debugMiddleware = require('../reducers/debug-middleware');
+var debugMiddleware = require('./debug-middleware');
 
 /**
  * Redux middleware which triggers an Angular change-detection cycle
@@ -72,8 +72,11 @@ function angularDigestMiddleware($rootScope) {
   };
 }
 
+/**
+ * Create the Redux store for the application.
+ */
 // @ngInject
-module.exports = function ($rootScope, settings) {
+function store($rootScope, settings) {
   var enhancer = redux.applyMiddleware(
     // The `thunk` middleware handles actions which are functions.
     // This is used to implement actions which have side effects or are
@@ -119,4 +122,6 @@ module.exports = function ($rootScope, settings) {
   ), store.getState);
 
   return Object.assign(store, actionCreators, selectors);
-};
+}
+
+module.exports = store;

src/sidebar/reducers/annotations.js → src/sidebar/store/modules/annotations.js

@@ -5,12 +5,12 @@
 
 'use strict';
 
-var arrayUtil = require('../util/array-util');
-var metadata = require('../annotation-metadata');
-var uiConstants = require('../ui-constants');
+var arrayUtil = require('../../util/array-util');
+var metadata = require('../../annotation-metadata');
+var uiConstants = require('../../ui-constants');
 
 var selection = require('./selection');
-var util = require('./util');
+var util = require('../util');
 
 /**
  * Return a copy of `current` with all matching annotations in `annotations`

src/sidebar/reducers/frames.js → src/sidebar/store/modules/frames.js

 'use strict';
 
-var util = require('./util');
+var util = require('../util');
 
 function init() {
   return {

src/sidebar/reducers/index.js → src/sidebar/store/modules/index.js

@@ -3,7 +3,7 @@
 /**
  * This module defines the main update function (or 'reducer' in Redux's
  * terminology) that handles app state updates. For an overview of how state
- * management in Redux works, see the comments at the top of `annotation-ui.js`
+ * management in Redux works, see the comments at the top of `store/index.js`
  *
  * Each sub-module in this folder defines:
  *
@@ -23,7 +23,7 @@ var links = require('./links');
 var selection = require('./selection');
 var session = require('./session');
 var viewer = require('./viewer');
-var util = require('./util');
+var util = require('../util');
 
 function init(settings) {
   return Object.assign(

src/sidebar/reducers/selection.js → src/sidebar/store/modules/selection.js

@@ -12,11 +12,11 @@
 
 var immutable = require('seamless-immutable');
 
-var toSet = require('../util/array-util').toSet;
-var uiConstants = require('../ui-constants');
-var tabs = require('../tabs');
+var toSet = require('../../util/array-util').toSet;
+var uiConstants = require('../../ui-constants');
+var tabs = require('../../tabs');
 
-var util = require('./util');
+var util = require('../util');
 
 
 /**

src/sidebar/reducers/session.js → src/sidebar/store/modules/session.js

 'use strict';
 
-var util = require('./util');
+var util = require('../util');
 
 function init() {
   return {

src/sidebar/reducers/test/annotations-test.js → src/sidebar/store/modules/test/annotations-test.js

@@ -5,9 +5,9 @@ var redux = require('redux');
 var thunk = require('redux-thunk').default;
 
 var annotations = require('../annotations');
-var fixtures = require('../../test/annotation-fixtures');
-var util = require('../util');
-var unroll = require('../../../shared/test/util').unroll;
+var fixtures = require('../../../test/annotation-fixtures');
+var util = require('../../util');
+var unroll = require('../../../../shared/test/util').unroll;
 
 var { actions, selectors } = annotations;
 

src/sidebar/reducers/test/frames-test.js → src/sidebar/store/modules/test/frames-test.js

@@ -2,8 +2,8 @@
 
 var frames = require('../frames');
 var session = require('../session');
-var util = require('../util');
-var unroll = require('../../../shared/test/util').unroll;
+var util = require('../../util');
+var unroll = require('../../../../shared/test/util').unroll;
 
 var actions = frames.actions;
 var update = util.createReducer(frames.update);

src/sidebar/reducers/test/session-test.js → src/sidebar/store/modules/test/session-test.js

@@ -2,7 +2,7 @@
 
 var session = require('../session');
 
-var util = require('../util');
+var util = require('../../util');
 
 var { init, actions, selectors } = session;
 var update = util.createReducer(session.update);

src/sidebar/reducers/test/viewer-test.js → src/sidebar/store/modules/test/viewer-test.js

@@ -2,7 +2,7 @@
 
 var viewer = require('../viewer');
 
-var util = require('../util');
+var util = require('../../util');
 
 var { init, actions, selectors } = viewer;
 var update = util.createReducer(viewer.update);

src/sidebar/reducers/viewer.js → src/sidebar/store/modules/viewer.js

 'use strict';
 
-var util = require('./util');
+var util = require('../util');
 
 /**
  * This module defines actions and state related to the display mode of the

src/sidebar/services/test/annotation-ui-test.js → src/sidebar/store/test/index-test.js

@@ -2,7 +2,7 @@
 
 var immutable = require('seamless-immutable');
 
-var annotationUIFactory = require('../annotation-ui');
+var annotationUIFactory = require('../index');
 var annotationFixtures = require('../../test/annotation-fixtures');
 var metadata = require('../../annotation-metadata');
 var unroll = require('../../../shared/test/util').unroll;

src/sidebar/test/integration/threading-test.js

@@ -44,7 +44,7 @@ describe('annotation threading', function () {
     };
 
     angular.module('app', [])
-      .service('annotationUI', require('../../services/annotation-ui'))
+      .service('annotationUI', require('../../store'))
       .service('drafts', require('../../services/drafts'))
       .service('rootThread', require('../../services/root-thread'))
       .service('searchFilter', require('../../services/search-filter'))