Better redirect for edit blod from MergeRequest

If you cancel edit you will be redirected back to merge request
If you submit changes you will be redirected back to merge request
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/application_controller.rb

@@ -210,4 +210,8 @@ class ApplicationController < ActionController::Base
     devise_parameter_sanitizer.for(:sign_in) { |u| u.permit(:username, :email, :password, :login, :remember_me) }
     devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:username, :email, :name, :password, :password_confirmation) }
   end
+
+  def hexdigest(string)
+    Digest::SHA1.hexdigest string
+  end
 end

app/controllers/projects/edit_tree_controller.rb

@@ -2,6 +2,8 @@ class Projects::EditTreeController < Projects::BaseTreeController
   before_filter :require_branch_head
   before_filter :blob
   before_filter :authorize_push!
+  before_filter :from_merge_request
+  before_filter :after_edit_path
 
   def show
     @last_commit = Gitlab::Git::Commit.last_for_path(@repository, @ref, @path).sha
@@ -13,15 +15,11 @@ class Projects::EditTreeController < Projects::BaseTreeController
     if result[:status] == :success
       flash[:notice] = "Your changes have been successfully committed"
 
-      # If blob edit was initiated from merge request page
-      from_merge_request = MergeRequest.find_by(id: params[:from_merge_request_id])
-
       if from_merge_request
         from_merge_request.reload_code
-        redirect_to diffs_project_merge_request_path(from_merge_request.target_project, from_merge_request)
-      else
-        redirect_to project_blob_path(@project, @id)
       end
+
+      redirect_to after_edit_path
     else
       flash[:alert] = result[:error]
       render :show
@@ -33,4 +31,19 @@ class Projects::EditTreeController < Projects::BaseTreeController
   def blob
     @blob ||= @repository.blob_at(@commit.id, @path)
   end
+
+  def after_edit_path
+    @after_edit_path ||=
+      if from_merge_request
+        diffs_project_merge_request_path(from_merge_request.target_project, from_merge_request) +
+          "#file-path-#{hexdigest(@path)}"
+      else
+        project_blob_path(@project, @id)
+      end
+  end
+
+  def from_merge_request
+    # If blob edit was initiated from merge request page
+    @from_merge_request ||= MergeRequest.find_by(id: params[:from_merge_request_id])
+  end
 end

app/views/projects/commits/_diffs.html.haml

@@ -45,7 +45,7 @@
       - file = project.repository.blob_at(@commit.parent_id, diff.old_path) unless file
       - next unless file
       .diff-file{id: "diff-#{i}"}
-        .diff-header
+        .diff-header{id: "file-path-#{hexdigest(diff.new_path || diff.old_path)}"}
           - if diff.deleted_file
             %span= diff.old_path
 

app/views/projects/edit_tree/show.html.haml

@@ -11,7 +11,7 @@
             %strong= @ref
         %span.options
           .btn-group.tree-btn-group
-            = link_to "Cancel", project_blob_path(@project, @id), class: "btn btn-tiny btn-cancel", data: { confirm: leave_edit_message }
+            = link_to "Cancel", @after_edit_path, class: "btn btn-tiny btn-cancel", data: { confirm: leave_edit_message }
       .file-content.code
         %pre#editor= @blob.data
 
@@ -29,7 +29,7 @@
         .message
           to branch
           %strong= @ref
-      = link_to "Cancel", project_blob_path(@project, @id), class: "btn btn-cancel", data: { confirm: leave_edit_message}
+      = link_to "Cancel", @after_edit_path, class: "btn btn-cancel", data: { confirm: leave_edit_message}
 
 :javascript
   ace.config.set("modePath", gon.relative_url_root + "#{Gitlab::Application.config.assets.prefix}/ace")