Remove Commits#compare, add CompareController

app/views/compare/_head.html.haml

@@ -0,0 +1,23 @@
+%ul.nav.nav-tabs
+  %li= render partial: 'shared/ref_switcher', locals: {destination: 'commits'}
+  %li{class: "#{'active' if current_page?(project_commits_path(@project)) }"}
+    = link_to project_commits_path(@project) do
+      Commits
+  %li{class: "#{'active' if current_page?(compare_project_commits_path(@project)) }"}
+    = link_to compare_project_commits_path(@project) do
+      Compare
+  %li{class: "#{branches_tab_class}"}
+    = link_to project_repository_path(@project) do
+      Branches
+      %span.badge= @project.repo.branch_count
+
+  %li{class: "#{'active' if current_page?(tags_project_repository_path(@project)) }"}
+    = link_to tags_project_repository_path(@project) do
+      Tags
+      %span.badge= @project.repo.tag_count
+
+  - if current_page?(project_commits_path(@project)) && current_user.private_token
+    %li.right
+      %span.rss-icon
+        = link_to project_commits_path(@project, :atom, { private_token: current_user.private_token, ref: @ref }), title: "Feed" do
+          = image_tag "rss_ui.png", title: "feed"

app/views/compare/show.html.haml

@@ -0,0 +1,53 @@
+= render "head"
+
+%h3.page_title
+  Compare View
+%hr
+
+%div
+  %p.slead
+    Fill input field with commit id like
+    %code.label_branch 4eedf23
+    or branch/tag name like
+    %code.label_branch master
+    and press compare button for commits list, code diff.
+
+  %br
+
+  = form_tag compare_project_commits_path(@project), method: :get do
+    .clearfix
+      = text_field_tag :from, params[:from], placeholder: "master", class: "xlarge"
+      = "..."
+      = text_field_tag :to, params[:to], placeholder: "aa8b4ef", class: "xlarge"
+    - if @refs_are_same
+      .alert
+        %span Refs are the same
+    .actions
+      = submit_tag "Compare", class: "btn primary wide commits-compare-btn"
+
+- if @commits.present?
+  %div.ui-box
+    %h5.small Commits (#{@commits.count})
+    %ul.unstyled= render @commits
+
+  - unless @diffs.empty?
+    %h4 Diff
+    = render "commits/diffs", diffs: @diffs
+
+:javascript
+  $(function() {
+    var availableTags = #{@project.ref_names.to_json};
+
+    $("#from").autocomplete({
+      source: availableTags,
+      minLength: 1
+    });
+
+    $("#to").autocomplete({
+      source: availableTags,
+      minLength: 1
+    });
+
+    disableButtonIfEmptyField('#to', '.commits-compare-btn');
+  });
+