More refactoring from last code review. #3945

* Use commit objects instead of IDs when generating diffs
* Use proper references when generating MR's source and target
* Update broken specs

app/controllers/projects/commit_controller.rb

@@ -72,7 +72,7 @@ class Projects::CommitController < Projects::ApplicationController
       @diffs = commit.diffs
     end
-    @diff_refs = [commit.parent_id || commit.id, commit.id]
+    @diff_refs = [commit.parent || commit, commit]
     @notes_count = commit.notes.count
     @statuses = ci_commit.statuses if ci_commit

app/controllers/projects/compare_controller.rb

@@ -20,9 +20,9 @@ class Projects::CompareController < Projects::ApplicationController
     if compare_result
       @commits = Commit.decorate(compare_result.commits, @project)
       @diffs = compare_result.diffs
-      @diff_refs = [base_ref, head_ref]
       @commit = @project.commit(head_ref)
       @first_commit = @project.commit(base_ref)
+      @diff_refs = [@first_commit, @commit]
       @line_notes = []
     end
   end

app/controllers/projects/merge_requests_controller.rb

@@ -59,7 +59,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   def diffs
     @commit = @merge_request.last_commit
     @first_commit = @merge_request.first_commit
-    @diff_refs = [@merge_request.last_commit.parent_id, @merge_request.source_sha]
     @comments_allowed = @reply_allowed = true
     @comments_target = {
@@ -104,8 +103,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     @commit = @merge_request.last_commit
     @first_commit = @merge_request.first_commit
     @diffs = @merge_request.compare_diffs
-    # We need to use #source_branch because #source_sha requires an existent MergeRequestDiff object.
-    @diff_refs = [@merge_request.target_sha, @merge_request.source_branch]
     @ci_commit = @merge_request.ci_commit
     @statuses = @ci_commit.statuses if @ci_commit

app/helpers/diff_helper.rb

@@ -19,13 +19,13 @@ module DiffHelper
     end
   end
-  def safe_diff_files(diffs, diff_refs, repository)
+  def safe_diff_files(diffs, diff_refs)
     lines = 0
     safe_files = []
     diffs.first(allowed_diff_size).each do |diff|
       lines += diff.diff.lines.count
       break if lines > allowed_diff_lines
-      safe_files << Gitlab::Diff::File.new(diff, diff_refs, repository)
+      safe_files << Gitlab::Diff::File.new(diff, diff_refs)
     end
     safe_files
   end

app/models/merge_request.rb

@@ -511,4 +511,8 @@ class MergeRequest < ActiveRecord::Base
   def broken?
     self.commits.blank? || branch_missing? || cannot_be_merged?
   end
+
+  def diff_range
+    [last_commit.parent, first_commit]
+  end
 end

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

 - if diff_view == 'parallel'
   - fluid_layout true
-- diff_files = safe_diff_files(diffs, diff_refs, repository)
+- diff_files = safe_diff_files(diffs, diff_refs)
 .gray-content-block.middle-block.oneline-block
   .inline-parallel-buttons

app/views/projects/merge_requests/_new_submit.html.haml

@@ -38,7 +38,7 @@
       = render "projects/merge_requests/show/commits"
     #diffs.diffs.tab-pane.active
       - if @diffs.present?
-        = render "projects/diffs/diffs", diffs: @diffs, project: @project, diff_refs: @diff_refs
+        = render "projects/diffs/diffs", diffs: @diffs, project: @project, diff_refs: @merge_request.diff_range
       - elsif @commits.size > MergeRequestDiff::COMMITS_SAFE_SIZE
         .alert.alert-danger
           %h4 This comparison includes more than #{MergeRequestDiff::COMMITS_SAFE_SIZE} commits.

app/views/projects/merge_requests/show/_diffs.html.haml

 - if @merge_request_diff.collected?
-  = render "projects/diffs/diffs", diffs: params[:w] == '1' ? @merge_request.diffs_no_whitespace : @merge_request.diffs, project: @merge_request.project, diff_refs: @diff_refs
+  = render "projects/diffs/diffs", diffs: params[:w] == '1' ? @merge_request.diffs_no_whitespace : @merge_request.diffs,
+    project: @merge_request.project, diff_refs: @merge_request.diff_range
 - elsif @merge_request_diff.empty?
   .nothing-here-block Nothing to merge from #{@merge_request.source_branch} into #{@merge_request.target_branch}
 - else

lib/gitlab/diff/file.rb

 module Gitlab
   module Diff
     class File
-      attr_reader :diff, :repository, :new_ref, :old_ref
+      attr_reader :diff, :new_ref, :old_ref
       delegate :new_file, :deleted_file, :renamed_file,
         :old_path, :new_path, to: :diff, prefix: false
-      def initialize(diff, diff_refs, repository)
+      def initialize(diff, diff_refs)
         @diff = diff
-        @repository = repository
         @old_ref, @new_ref = diff_refs
       end

lib/gitlab/diff/highlight.rb

@@ -3,8 +3,7 @@ module Gitlab
     class Highlight
       attr_reader :diff_file
-      delegate :repository, :old_path, :new_path, :old_ref, :new_ref,
-        to: :diff_file, prefix: :diff
+      delegate :old_path, :new_path, :old_ref, :new_ref, to: :diff_file, prefix: :diff
       def initialize(diff_file)
         @diff_file = diff_file
@@ -141,11 +140,11 @@ module Gitlab
       end
       def old_lines
-        @old_lines ||= Gitlab::Highlight.highlight_lines(diff_repository, diff_old_ref, diff_old_path)
+        @old_lines ||= self.class.process_file(*processing_args(:old))
       end
       def new_lines
-        @new_lines ||= Gitlab::Highlight.highlight_lines(diff_repository, diff_new_ref, diff_new_path)
+        @new_lines ||= self.class.process_file(*processing_args(:new))
       end
       def longest_common_suffix(a, b)
@@ -200,6 +199,16 @@ module Gitlab
         offset
       end
+
+      private
+
+      def processing_args(version)
+        ref  = send("diff_#{version}_ref")
+        path = send("diff_#{version}_path")
+
+        [ref.project.repository, ref.id, path]
+      end
+
     end
   end
 end

spec/helpers/diff_helper_spec.rb

@@ -8,8 +8,8 @@ describe DiffHelper do
   let(:commit) { project.commit(sample_commit.id) }
   let(:diffs) { commit.diffs }
   let(:diff) { diffs.first }
-  let(:diff_refs) { [commit.parent.id, commit.id] }
-  let(:diff_file) { Gitlab::Diff::File.new(diff, diff_refs, repository) }
+  let(:diff_refs) { [commit.parent, commit] }
+  let(:diff_file) { Gitlab::Diff::File.new(diff, diff_refs) }
   describe 'diff_hard_limit_enabled?' do
     it 'should return true if param is provided' do
@@ -46,41 +46,41 @@ describe DiffHelper do
   describe 'safe_diff_files' do
     it 'should return all files from a commit that is smaller than safe limits' do
-      expect(safe_diff_files(diffs, diff_refs, repository).length).to eq(2)
+      expect(safe_diff_files(diffs, diff_refs).length).to eq(2)
     end
     it 'should return only the first file if the diff line count in the 2nd file takes the total beyond safe limits' do
       allow(diffs[1].diff).to receive(:lines).and_return([""] * 4999) #simulate 4999 lines
-      expect(safe_diff_files(diffs, diff_refs, repository).length).to eq(1)
+      expect(safe_diff_files(diffs, diff_refs).length).to eq(1)
     end
     it 'should return all files from a commit that is beyond safe limit for numbers of lines if force diff is true' do
       allow(controller).to receive(:params) { { force_show_diff: true } }
       allow(diffs[1].diff).to receive(:lines).and_return([""] * 4999) #simulate 4999 lines
-      expect(safe_diff_files(diffs, diff_refs, repository).length).to eq(2)
+      expect(safe_diff_files(diffs, diff_refs).length).to eq(2)
     end
     it 'should return only the first file if the diff line count in the 2nd file takes the total beyond hard limits' do
       allow(controller).to receive(:params) { { force_show_diff: true } }
       allow(diffs[1].diff).to receive(:lines).and_return([""] * 49999) #simulate 49999 lines
-      expect(safe_diff_files(diffs, diff_refs, repository).length).to eq(1)
+      expect(safe_diff_files(diffs, diff_refs).length).to eq(1)
     end
     it 'should return only a safe number of file diffs if a commit touches more files than the safe limits' do
       large_diffs = diffs * 100 #simulate 200 diffs
-      expect(safe_diff_files(large_diffs, diff_refs, repository).length).to eq(100)
+      expect(safe_diff_files(large_diffs, diff_refs).length).to eq(100)
     end
     it 'should return all file diffs if a commit touches more files than the safe limits but force diff is true' do
       allow(controller).to receive(:params) { { force_show_diff: true } }
       large_diffs = diffs * 100 #simulate 200 diffs
-      expect(safe_diff_files(large_diffs, diff_refs, repository).length).to eq(200)
+      expect(safe_diff_files(large_diffs, diff_refs).length).to eq(200)
     end
     it 'should return a limited file diffs if a commit touches more files than the hard limits and force diff is true' do
       allow(controller).to receive(:params) { { force_show_diff: true } }
       very_large_diffs = diffs * 1000 #simulate 2000 diffs
-      expect(safe_diff_files(very_large_diffs, diff_refs, repository).length).to eq(1000)
+      expect(safe_diff_files(very_large_diffs, diff_refs).length).to eq(1000)
     end
   end
@@ -128,7 +128,11 @@ describe DiffHelper do
       expect(diff_line_content(diff_file.diff_lines.first.text)).
         to eq('@@ -6,12 +6,18 @@ module Popen')
       expect(diff_line_content(diff_file.diff_lines.first.type)).to eq('match')
-      expect(diff_line_content(diff_file.diff_lines.first.new_pos)).to eq(6)
+      expect(diff_file.diff_lines.first.new_pos).to eq(6)
+    end
+
+    it 'should return safe HTML' do
+      expect(diff_line_content(diff_file.diff_lines.first.text)).to be_html_safe
     end
   end

spec/lib/gitlab/diff/file_spec.rb

@@ -6,7 +6,7 @@ describe Gitlab::Diff::File, lib: true do
   let(:project) { create(:project) }
   let(:commit) { project.commit(sample_commit.id) }
   let(:diff) { commit.diffs.first }
-  let(:diff_file) { Gitlab::Diff::File.new(diff, [commit.parent.id, commit.id], project.repository) }
+  let(:diff_file) { Gitlab::Diff::File.new(diff, [commit.parent, commit]) }
   describe :diff_lines do
     let(:diff_lines) { diff_file.diff_lines }

spec/lib/gitlab/diff/highlight_spec.rb

@@ -6,7 +6,7 @@ describe Gitlab::Diff::Highlight, lib: true do
   let(:project) { create(:project) }
   let(:commit) { project.commit(sample_commit.id) }
   let(:diff) { commit.diffs.first }
-  let(:diff_file) { Gitlab::Diff::File.new(diff, [commit.parent.id, commit.id], project.repository) }
+  let(:diff_file) { Gitlab::Diff::File.new(diff, [commit.parent, commit]) }
   describe '.process_diff_lines' do
     context 'when processing Gitlab::Diff::Line objects' do