Merge branch 'changelog-link' into 'master'

Add changelog, license and contribution guide links to project sidebar.

If the version is known, the "Version: 7.9.0pre" button links to the changelog, otherwise a "View changelog" button is shown.

![Screen_Shot_2015-03-18_at_14.22.29](https://dev.gitlab.org/gitlab/gitlabhq/uploads/747acc018ec9a188098e0f0bc4e91cc3/Screen_Shot_2015-03-18_at_14.22.29.png)

See merge request !1708

3 files changed, 21 insertions, 10 deletions

diff --git a/app/views/projects/_issuable_form.html.haml b/app/views/projects/_issuable_form.html.haml
index a7cd129b631..7fd5fe8a6e1 100644
--- a/app/views/projects/_issuable_form.html.haml
+++ b/app/views/projects/_issuable_form.html.haml
@@ -71,10 +71,10 @@
       = link_to 'Create new label', new_namespace_project_label_path(issuable.project.namespace, issuable.project), target: :blank
 
 .form-actions
-  - if !issuable.project.empty_repo? && contribution_guide_url(issuable.project) && !issuable.persisted?
+  - if !issuable.project.empty_repo? && (guide_url = contribution_guide_url(issuable.project)) && !issuable.persisted?
     %p
       Please review the
-      %strong #{link_to 'guidelines for contribution', contribution_guide_url(issuable.project)}
+      %strong #{link_to 'guidelines for contribution', guide_url}
       to this repository.
   - if issuable.new_record?
     = f.submit "Submit new #{issuable.class.model_name.human.downcase}", class: 'btn btn-create'
diff --git a/app/views/projects/merge_requests/_new_submit.html.haml b/app/views/projects/merge_requests/_new_submit.html.haml
index bf80afe8785..1d8eef4e8ce 100644
--- a/app/views/projects/merge_requests/_new_submit.html.haml
+++ b/app/views/projects/merge_requests/_new_submit.html.haml
@@ -69,10 +69,10 @@
           = link_to 'Create new label', new_namespace_project_label_path(@merge_request.target_project.namespace, @merge_request.target_project), target: :blank
 
     .form-actions
-      - if contribution_guide_url(@target_project)
+      - if guide_url = contribution_guide_url(@target_project)
         %p
           Please review the
-          %strong #{link_to 'guidelines for contribution', contribution_guide_url(@target_project)}
+          %strong #{link_to 'guidelines for contribution', guide_url}
           to this repository.
       = f.hidden_field :source_project_id
       = f.hidden_field :source_branch
diff --git a/app/views/projects/show.html.haml b/app/views/projects/show.html.haml
index 74b07395650..822e67c5616 100644
--- a/app/views/projects/show.html.haml
+++ b/app/views/projects/show.html.haml
@@ -47,15 +47,26 @@
               = link_to @project.forked_from_project.name_with_namespace, namespace_project_path(@project.namespace, @project.forked_from_project)
 
           - unless @project.empty_repo?
-            = link_to namespace_project_compare_index_path(@project.namespace, @project, from: @repository.root_ref, to: @ref || @repository.root_ref), class: 'btn btn-block' do
-              Compare code
-
-            - if @repository.version
-              - version = @repository.version
-              = link_to namespace_project_blob_path(@project.namespace, @project, tree_join(@repository.root_ref, version.name)), class: 'btn btn-block' do
+            - if version = @repository.version
+              - detail_url = changelog_url(@project) || version_url(@project)
+              = link_to detail_url, class: 'btn btn-block' do
                 Version:
                 %span.count
                   = @repository.blob_by_oid(version.id).data
+            - elsif @repository.changelog
+              = link_to changelog_url(@project), class: 'btn btn-block' do
+                View changelog
+
+            - if @repository.contribution_guide
+              = link_to contribution_guide_url(@project), class: 'btn btn-block' do
+                View contribution guide
+
+            - if @repository.license
+              = link_to license_url(@project), class: 'btn btn-block' do
+                View license
+            
+            = link_to namespace_project_compare_index_path(@project.namespace, @project, from: @repository.root_ref, to: @ref || @repository.root_ref), class: 'btn btn-block' do
+              Compare code
 
         .prepend-top-10
           %p