Improve fork to namespaces feature

* Show namespace thumbnail differently if project was already forked
* Show loading spinner when click on fork
* Fork link navigates to personal namespace only if no manageable groups exists

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/dispatcher.js.coffee

@@ -75,6 +75,8 @@ class Dispatcher
         # Ensure we don't create a particular shortcut handler here. This is
         # already created, where the network graph is created.
         shortcut_handler = true
+      when 'projects:forks:new'
+        new ProjectFork()
       when 'users:show'
         new User()

app/assets/javascripts/project_fork.js.coffee

+class @ProjectFork
+  constructor: ->
+    $('.fork-thumbnail a').on 'click', ->
+      $('.fork-namespaces').hide()
+      $('.save-project-loader').show()

app/assets/stylesheets/sections/projects.scss

@@ -270,3 +270,28 @@ ul.nav.nav-projects-tabs {
     color: #999;
   }
 }
+
+.fork-namespaces {
+  .thumbnail {
+
+    &.fork-exists-thumbnail {
+      border-color: #EEE;
+
+      .caption {
+        color: #999;
+      }
+    }
+
+    &.fork-thumbnail {
+      border-color: #AAA;
+
+      &:hover {
+        background-color: $hover;
+      }
+    }
+
+    a {
+      text-decoration: none;
+    }
+  }
+}

app/helpers/namespaces_helper.rb

@@ -25,4 +25,12 @@ module NamespacesHelper
     hidden_field_tag(id, value, class: css_class)
   end
+
+  def namespace_icon(namespace, size = 40)
+    if namespace.kind_of?(Group)
+      group_icon(namespace.path)
+    else
+      avatar_icon(namespace.owner.email, size)
+    end
+  end
 end

app/models/namespace.rb

@@ -90,4 +90,8 @@ class Namespace < ActiveRecord::Base
   def kind
     type == 'Group' ? 'group' : 'user'
   end
+
+  def find_fork_of(project)
+    projects.joins(:forked_project_link).where('forked_project_links.forked_from_project_id = ?', project.id).first
+  end
 end

app/views/projects/_home_panel.html.haml

@@ -16,7 +16,7 @@
       - unless @project.empty_repo?
         .fork-buttons
           - if current_user && can?(current_user, :fork_project, @project) && @project.namespace != current_user.namespace
-            - if current_user.already_forked?(@project)
+            - if current_user.already_forked?(@project) && current_user.manageable_namespaces.size < 2
               = link_to project_path(current_user.fork_of(@project)), title: 'Go to my fork' do
                 = link_to_toggle_fork
             - else

app/views/projects/forks/new.html.haml

@@ -2,18 +2,37 @@
 %p.lead Select namespace where to fork this project
 %hr
-- @namespaces.in_groups_of(6, false) do |group|
-  .row
-    - group.each do |namespace|
-      .col-md-2.col-sm-3
-        .thumbnail
-          = link_to project_fork_path(@project, namespace_id: namespace.id), title: "Fork here", method: "POST" do
-            - if namespace.kind_of?(Group)
-              = image_tag group_icon(namespace.path)
-            - else
-              = image_tag avatar_icon(namespace.owner.email, 200)
-            .caption
-              %h4=namespace.human_name
-              %p
-                = namespace.path
+.fork-namespaces
+  - @namespaces.in_groups_of(6, false) do |group|
+    .row
+      - group.each do |namespace|
+        .col-md-2.col-sm-3
+          - if fork = namespace.find_fork_of(@project)
+            .thumbnail.fork-exists-thumbnail
+              = link_to project_path(fork), title: "Visit project fork", class: 'has_tooltip' do
+                = image_tag namespace_icon(namespace, 200)
+                .caption
+                  %h4=namespace.human_name
+                  %p
+                    = namespace.path
+          - else
+            .thumbnail.fork-thumbnail
+              = link_to project_fork_path(@project, namespace_id: namespace.id), title: "Fork here", method: "POST", class: 'has_tooltip' do
+                = image_tag namespace_icon(namespace, 200)
+                .caption
+                  %h4=namespace.human_name
+                  %p
+                    = namespace.path
+
+  %p.light
+    Fork is a copy of a project repository.
+    %br
+    Forking a repository allows you to do changes without affecting the original project.
+
+.save-project-loader.hide
+  .center
+    %h2
+      %i.fa.fa-spinner.fa-spin
+      Forking repository
+    %p Please wait a moment, this page will automatically refresh when ready.

features/project/fork.feature

@@ -6,9 +6,11 @@ Feature: Project Fork
   Scenario: User fork a project
     Given I click link "Fork"
+    When I fork to my namespace
     Then I should see the forked project page
   Scenario: User already has forked the project
     Given I already have a project named "Shop" in my namespace
     And I click link "Fork"
+    When I fork to my namespace
     Then I should see a "Name has already been taken" warning

features/steps/project/fork.rb

@@ -25,4 +25,10 @@ class Spinach::Features::ProjectFork < Spinach::FeatureSteps
   step 'I should see a "Name has already been taken" warning' do
     page.should have_content "Name has already been taken"
   end
+
+  step 'I fork to my namespace' do
+    within '.fork-namespaces' do
+      click_link current_user.name
+    end
+  end
 end