MD editor coversations&comments: refactorings

Javascript refactorings for better maintainability:
* simplePreview function to avoid code duplication
* Preloaded conversation is processed in a slightly different way
* Split isPreviewOrTexareaNotEmpty function since it has more than one responsibility

app/assets/javascripts/app/router.js

@@ -9,7 +9,7 @@ app.Router = Backbone.Router.extend({
     "commented(/)": "stream",
     "community_spotlight(/)": "spotlight",
     "contacts(/)": "contacts",
-    "conversations(/)(:id)(/)": "conversations",
+    "conversations(/)(:id)(?conversation_id=:conversation_id)(/)": "conversations",
     "followed_tags(/)": "followed_tags",
     "getting_started(/)": "gettingStarted",
     "help(/)": "help",
@@ -93,8 +93,8 @@ app.Router = Backbone.Router.extend({
     app.page = new app.pages.Contacts({stream: stream});
   },
 
-  conversations: function(id) {
-    app.conversations = app.conversations || new app.views.ConversationsInbox();
+  conversations: function(id, conversationId) {
+    app.conversations = app.conversations || new app.views.ConversationsInbox(conversationId);
     if (parseInt("" + id, 10)) {
       app.conversations.renderConversation(id);
     }

app/assets/javascripts/app/views/comment_stream_view.js

@@ -31,9 +31,7 @@ app.views.CommentStream = app.views.Base.extend({
     new app.views.CommentMention({el: this.$el, postId: this.model.get("id")});
 
     this.mdEditor = new Diaspora.MarkdownEditor(this.$(".comment_box"), {
-      onPreview: function($mdInstance) {
-        return "<div class='preview-content'>" + app.helpers.textFormatter($mdInstance.getContent()) + "</div>";
-      },
+      onPreview: Diaspora.MarkdownEditor.simplePreview,
       onFocus: this.openForm.bind(this)
     });
   },
@@ -156,8 +154,15 @@ app.views.CommentStream = app.views.Base.extend({
     autosize.update(this.commentBox);
   },
 
+  isCloseAllowed: function() {
+    if (this.mdEditor === undefined) {
+      return true;
+    }
+    return !this.mdEditor.isPreviewMode() && this.mdEditor.userInputEmpty();
+  },
+
   onFormBlur: function(evt) {
-    if (this.mdEditor !== undefined && this.mdEditor.isPreviewOrTexareaNotEmpty()) {
+    if (!this.isCloseAllowed()) {
       return;
     }
 

app/assets/javascripts/app/views/conversations_form_view.js

@@ -26,12 +26,6 @@ app.views.ConversationsForm = app.views.Base.extend({
 
     this.newConversationMdEditor = this.renderMarkdownEditor("#new-message-text");
 
-    // Creates another markdown editor in case of displaying conversation
-    var responseTextarea = $("#conversation-show .conversation-message-text");
-    if (responseTextarea.length === 1) {
-      this.renderMarkdownEditor(responseTextarea);
-    }
-
     this.bindTypeaheadEvents();
 
     this.tagListElement.empty();
@@ -45,9 +39,7 @@ app.views.ConversationsForm = app.views.Base.extend({
 
   renderMarkdownEditor: function(element) {
     return new Diaspora.MarkdownEditor($(element), {
-      onPreview: function($mdInstance) {
-        return "<div class='preview-content'>" + app.helpers.textFormatter($mdInstance.getContent()) + "</div>";
-      }
+      onPreview: Diaspora.MarkdownEditor.simplePreview
     });
   },
 

app/assets/javascripts/app/views/conversations_inbox_view.js

@@ -8,11 +8,21 @@ app.views.ConversationsInbox = app.views.Base.extend({
     "click .new-conversation-btn": "displayNewConversation"
   },
 
-  initialize: function() {
+  initialize: function(conversationId) {
     this.conversationForm = new app.views.ConversationsForm();
+
+    // Creates markdown editor in case of displaying preloaded conversation
+    if (conversationId != null) {
+      this.renderMarkdownEditor();
+    }
+
     this.setupConversation();
   },
 
+  renderMarkdownEditor: function() {
+    this.conversationForm.renderMarkdownEditor("#conversation-show .conversation-message-text");
+  },
+
   renderConversation: function(conversationId) {
     var self = this;
     $.ajax({
@@ -23,7 +33,7 @@ app.views.ConversationsInbox = app.views.Base.extend({
         self.$el.find("#conversation-show").removeClass("hidden").html(data);
         self.selectConversation(conversationId);
         self.setupConversation();
-        self.conversationForm.renderMarkdownEditor("#conversation-show .conversation-message-text");
+        self.renderMarkdownEditor();
         autosize(self.$("#conversation-show textarea"));
       }
     });

app/assets/javascripts/helpers/markdown_editor.js

@@ -130,11 +130,12 @@ Diaspora.MarkdownEditor.prototype = {
     }
   },
 
-  isPreviewOrTexareaNotEmpty: function() {
-    if (this.instance === undefined) {
-      return false;
-    }
-    return (this.instance.$editor.find(".md-preview").length > 0) || (this.instance.getContent().length > 0);
+  isPreviewMode: function() {
+    return this.instance !== undefined && this.instance.$editor.find(".md-preview").length > 0;
+  },
+
+  userInputEmpty: function() {
+    return this.instance === undefined || this.instance.getContent().length === 0;
   },
 
   localize: function() {
@@ -167,3 +168,7 @@ Diaspora.MarkdownEditor.prototype = {
     return locale;
   }
 };
+
+Diaspora.MarkdownEditor.simplePreview = function($mdInstance) {
+  return "<div class='preview-content'>" + app.helpers.textFormatter($mdInstance.getContent()) + "</div>";
+};

spec/javascripts/app/router_spec.js

@@ -112,6 +112,13 @@ describe('app.Router', function () {
       this.router.conversations("12");
       expect(app.views.ConversationsInbox.prototype.renderConversation).toHaveBeenCalledWith("12");
     });
+
+    it("passes conversation_id parameter to ConversationsInbox initializer when passed in URL", function() {
+      app.conversations = undefined;
+      spyOn(app.views.ConversationsInbox.prototype, "initialize");
+      this.router.navigate("/conversations?conversation_id=45", {trigger: true});
+      expect(app.views.ConversationsInbox.prototype.initialize).toHaveBeenCalledWith("45");
+    });
   });
 
   describe("stream", function() {

spec/javascripts/app/views/comment_stream_view_spec.js

@@ -368,16 +368,26 @@ describe("app.views.CommentStream", function(){
       spec.content().html("<div class='new-comment'/><div class='focus_comment_textarea'/>");
     });
 
-    it("does not call closeForm if markdown editor contains text or is in preview mode", function() {
+    it("does not call closeForm if markdown editor is in preview mode", function() {
       spyOn(this.view, "closeForm");
-      spyOn(this.view.mdEditor, "isPreviewOrTexareaNotEmpty").and.returnValue(true);
+      spyOn(this.view.mdEditor, "isPreviewMode").and.returnValue(true);
+      spyOn(this.view.mdEditor, "userInputEmpty").and.returnValue(true);
+      this.view.onFormBlur();
+      expect(this.view.closeForm).not.toHaveBeenCalled();
+    });
+
+    it("does not call closeForm if markdown editor contains text", function() {
+      spyOn(this.view, "closeForm");
+      spyOn(this.view.mdEditor, "isPreviewMode").and.returnValue(false);
+      spyOn(this.view.mdEditor, "userInputEmpty").and.returnValue(false);
       this.view.onFormBlur();
       expect(this.view.closeForm).not.toHaveBeenCalled();
     });
 
     it("does not call closeForm when the form is clicked", function() {
       spyOn(this.view, "closeForm");
-      spyOn(this.view.mdEditor, "isPreviewOrTexareaNotEmpty").and.returnValue(false);
+      spyOn(this.view.mdEditor, "isPreviewMode").and.returnValue(false);
+      spyOn(this.view.mdEditor, "userInputEmpty").and.returnValue(true);
       this.view.onFormBlur($.Event("click", {target: $(".new-comment")}));
       expect(this.view.closeForm).not.toHaveBeenCalled();
       this.view.onFormBlur($.Event("click", {target: $(".focus_comment_textarea")}));
@@ -386,7 +396,8 @@ describe("app.views.CommentStream", function(){
 
     it("calls closeForm when the user clicks outside of the form", function() {
       spyOn(this.view, "closeForm");
-      spyOn(this.view.mdEditor, "isPreviewOrTexareaNotEmpty").and.returnValue(false);
+      spyOn(this.view.mdEditor, "isPreviewMode").and.returnValue(false);
+      spyOn(this.view.mdEditor, "userInputEmpty").and.returnValue(true);
       this.view.onFormBlur($.Event("click", {target: $("body")}));
       expect(this.view.closeForm).toHaveBeenCalled();
     });

spec/javascripts/app/views/conversations_form_view_spec.js

@@ -41,13 +41,6 @@ describe("app.views.ConversationsForm", function() {
       this.target.initialize();
       expect(this.target.renderMarkdownEditor).toHaveBeenCalledWith("#new-message-text");
     });
-
-    it("creates markdown editor for an existing conversation", function() {
-      spyOn(this.target, "renderMarkdownEditor");
-      this.target.initialize();
-      expect(this.target.renderMarkdownEditor).toHaveBeenCalledWith(
-        $("#conversation-show .conversation-message-text"));
-    });
   });
 
   describe("renderMarkdownEditor", function() {

spec/javascripts/app/views/conversations_inbox_view_spec.js

@@ -17,6 +17,14 @@ describe("app.views.ConversationsInbox", function() {
       new app.views.ConversationsInbox();
       expect(app.views.ConversationsInbox.prototype.setupConversation).toHaveBeenCalled();
     });
+
+    it("creates markdown editor for an existing conversation", function() {
+      spyOn(app.views.ConversationsForm.prototype, "renderMarkdownEditor");
+      new app.views.ConversationsInbox(1);
+      expect(app.views.ConversationsForm.prototype.renderMarkdownEditor).toHaveBeenCalledWith(
+        "#conversation-show .conversation-message-text"
+      );
+    });
   });
 
   describe("renderConversation", function() {

spec/javascripts/helpers/markdown_editor_spec.js

@@ -220,24 +220,45 @@ describe("Diaspora.MarkdownEditor", function() {
     });
   });
 
-  describe("isPreviewOrTexareaNotEmpty", function() {
+  describe("isPreviewMode", function() {
     beforeEach(function() {
       this.target = new Diaspora.MarkdownEditor(this.$el, {onPreview: $.noop, onPostPreview: $.noop()});
     });
 
     it("return false if editor is not visible yet", function() {
       this.target.instance = undefined;
-      expect(this.target.isPreviewOrTexareaNotEmpty()).toBe(false);
+      expect(this.target.isPreviewMode()).toBe(false);
+    });
+
+    it("returns false if the editor is in write (default) mode", function() {
+      expect(this.target.instance).toBeDefined();
+      expect(this.target.isPreviewMode()).toBe(false);
     });
 
     it("returns true if editor is in preview mode", function() {
       this.target.showPreview();
-      expect(this.target.isPreviewOrTexareaNotEmpty()).toBe(true);
+      expect(this.target.isPreviewMode()).toBe(true);
+    });
+  });
+
+  describe("userInputEmpty", function() {
+    beforeEach(function() {
+      this.target = new Diaspora.MarkdownEditor(this.$el, {onPreview: $.noop, onPostPreview: $.noop()});
     });
 
-    it("returns true if editor has content", function() {
+    it("return true if editor is not visible yet", function() {
+      this.target.instance = undefined;
+      expect(this.target.userInputEmpty()).toBe(true);
+    });
+
+    it("returns true if editor has no content", function() {
+      $("textarea").text("");
+      expect(this.target.userInputEmpty()).toBe(true);
+    });
+
+    it("returns false if editor has content", function() {
       $("textarea").text("Yolo");
-      expect(this.target.isPreviewOrTexareaNotEmpty()).toBe(true);
+      expect(this.target.userInputEmpty()).toBe(false);
     });
   });
 
@@ -255,4 +276,18 @@ describe("Diaspora.MarkdownEditor", function() {
       expect($.fn.markdown.messages[Diaspora.I18n.language]).toBeDefined();
     });
   });
+
+  describe("simplePreview", function() {
+    beforeEach(function() {
+      this.target = new Diaspora.MarkdownEditor(this.$el, {});
+    });
+
+    it("generates HTML for preview", function() {
+      spyOn(app.helpers, "textFormatter").and.callThrough();
+      this.$el[0].value = "<p>hello</p>";
+      var res = Diaspora.MarkdownEditor.simplePreview(this.target.instance);
+      expect(app.helpers.textFormatter).toHaveBeenCalledWith("<p>hello</p>");
+      expect(res).toBe("<div class='preview-content'><p>hello</p></div>");
+    });
+  });
 });