implement .file_contents

lib/gitlab/client/repositories.rb

@@ -76,6 +76,24 @@ def commit_diff(project, sha)
     end
     alias_method :repo_commit_diff, :commit_diff
 
+    # Get the contents of a file
+    #
+    # @example
+    #   Gitlab.file_contents(42, 'Gemfile')
+    #   Gitlab.repo_file_contents(3, 'Gemfile', 'ed899a2f4b50b4370feeea94676502b42383c746')
+    #
+    # @param  [Integer] project The ID of a project.
+    # @param  [String] filepath The relative path of the file in the repository
+    # @param  [String] ref The name of a repository branch or tag or if not given the default branch.
+    # @return [String]
+    def file_contents(project, filepath, ref = 'master')
+      get "/projects/#{project}/repository/blobs/#{ref}?filepath=#{filepath}",
+        format: nil,
+        headers: { Accept: 'text/plain' },
+        parser: ::Gitlab::Request::Parser
+    end
+    alias_method :repo_file_contents, :file_contents
+
     # Gets a list of comments for a commit.
     #
     # @example

spec/fixtures/raw_file.json

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'rails', '4.1.2'

spec/gitlab/client/repositories_spec.rb

@@ -28,6 +28,21 @@
     end
   end
 
+  describe ".file_contents" do
+    before do
+      stub_get("/projects/3/repository/blobs/master?filepath=Gemfile", "raw_file")
+      @file_contents = Gitlab.file_contents(3, "Gemfile")
+    end
+
+    it "should get the correct resource" do
+      expect(a_get("/projects/3/repository/blobs/master?filepath=Gemfile")).to have_been_made
+    end
+
+    it "should return file contents" do
+      expect(@file_contents).to eq("source 'https://rubygems.org'\ngem 'rails', '4.1.2'\n")
+    end
+  end
+
   describe ".create_tag" do
     context "lightweight" do
       before do