Filter commits by author in controller

Adds ability to filter commits by the author name in the controller.

app/controllers/projects/commits_controller.rb

@@ -64,10 +64,13 @@ class Projects::CommitsController < Projects::ApplicationController
     render_404 unless @path.empty? || request.format == :atom || @repository.blob_at(@commit.id, @path) || @repository.tree(@commit.id, @path).entries.present?
     @limit, @offset = (params[:limit] || 40).to_i, (params[:offset] || 0).to_i
     search = params[:search]
+    author = params[:author]
 
     @commits =
       if search.present?
         @repository.find_commits_by_message(search, @ref, @path, @limit, @offset)
+      elsif author.present?
+        @repository.commits(@ref, author: author, path: @path, limit: @limit, offset: @offset)
       else
         @repository.commits(@ref, path: @path, limit: @limit, offset: @offset)
       end

spec/features/commits_spec.rb

@@ -183,4 +183,22 @@ describe 'Commits' do
       expect(find('.js-project-refs-dropdown')).to have_content branch_name
     end
   end
+
+  context 'viewing commits for an author' do
+    let(:author_commit) { project.repository.commits(nil, limit: 1).first }
+    let(:author) { "#{author_commit.author_name} <#{author_commit.author_email}>" }
+    let(:commits) { project.repository.commits(nil, author: author, limit: 40) }
+
+    before do
+      project.add_maintainer(user)
+      sign_in(user)
+      visit project_commits_path(project, nil, author: author)
+    end
+
+    it 'includes the committed_date for each commit' do
+      commits.each do |commit|
+        expect(page).to have_content("authored #{commit.authored_date.strftime("%b %d, %Y")}")
+      end
+    end
+  end
 end