Merge branch 'refactor-complex-methods' into 'master'

Refactor complex methods

Make flog part of CI check which is not allowed to fail. I used high score (70) and refactored most complex method. In future releases we should lower acceptable score to something like 40..50

Part of #3444 

See merge request !1794

8 files changed, 200 insertions, 155 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 128faa07db8..141e7ba41de 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -80,7 +80,6 @@ flog:
   tags:
     - ruby
     - mysql
-  allow_failure: true
 
 flay:
   script:
diff --git a/app/helpers/events_helper.rb b/app/helpers/events_helper.rb
index 51b872b7a95..dde83ff36b5 100644
--- a/app/helpers/events_helper.rb
+++ b/app/helpers/events_helper.rb
@@ -108,19 +108,23 @@ module EventsHelper
         end
       end
     elsif event.push?
-      if event.push_with_commits? && event.md_ref?
-        if event.commits_count > 1
-          namespace_project_compare_url(event.project.namespace, event.project,
-                                        from: event.commit_from, to:
-                                        event.commit_to)
-        else
-          namespace_project_commit_url(event.project.namespace, event.project,
-                                       id: event.commit_to)
-        end
+      push_event_feed_url(event)
+    end
+  end
+
+  def push_event_feed_url(event)
+    if event.push_with_commits? && event.md_ref?
+      if event.commits_count > 1
+        namespace_project_compare_url(event.project.namespace, event.project,
+                                      from: event.commit_from, to:
+                                      event.commit_to)
       else
-        namespace_project_commits_url(event.project.namespace, event.project,
-                                      event.ref_name)
+        namespace_project_commit_url(event.project.namespace, event.project,
+                                     id: event.commit_to)
       end
+    else
+      namespace_project_commits_url(event.project.namespace, event.project,
+                                    event.ref_name)
     end
   end
 
diff --git a/app/services/issues/update_service.rb b/app/services/issues/update_service.rb
index 551325e4cab..aa1fd79d22d 100644
--- a/app/services/issues/update_service.rb
+++ b/app/services/issues/update_service.rb
@@ -22,24 +22,27 @@ module Issues
             issue, issue.labels - old_labels, old_labels - issue.labels)
         end
 
-        if issue.previous_changes.include?('milestone_id')
-          create_milestone_note(issue)
-        end
-
-        if issue.previous_changes.include?('assignee_id')
-          create_assignee_note(issue)
-          notification_service.reassigned_issue(issue, current_user)
-        end
-
-        if issue.previous_changes.include?('title')
-          create_title_change_note(issue, issue.previous_changes['title'].first)
-        end
-
+        handle_changes(issue)
         issue.create_new_cross_references!(current_user)
         execute_hooks(issue, 'update')
       end
 
       issue
     end
+
+    def handle_changes(issue)
+      if issue.previous_changes.include?('milestone_id')
+        create_milestone_note(issue)
+      end
+
+      if issue.previous_changes.include?('assignee_id')
+        create_assignee_note(issue)
+        notification_service.reassigned_issue(issue, current_user)
+      end
+
+      if issue.previous_changes.include?('title')
+        create_title_change_note(issue, issue.previous_changes['title'].first)
+      end
+    end
   end
 end
diff --git a/app/services/merge_requests/update_service.rb b/app/services/merge_requests/update_service.rb
index 61f7d2bbe89..d2849e5193f 100644
--- a/app/services/merge_requests/update_service.rb
+++ b/app/services/merge_requests/update_service.rb
@@ -35,35 +35,38 @@ module MergeRequests
           )
         end
 
-        if merge_request.previous_changes.include?('target_branch')
-          create_branch_change_note(merge_request, 'target',
-                                    merge_request.previous_changes['target_branch'].first,
-                                    merge_request.target_branch)
-        end
+        handle_changes(merge_request)
+        merge_request.create_new_cross_references!(current_user)
+        execute_hooks(merge_request, 'update')
+      end
 
-        if merge_request.previous_changes.include?('milestone_id')
-          create_milestone_note(merge_request)
-        end
+      merge_request
+    end
 
-        if merge_request.previous_changes.include?('assignee_id')
-          create_assignee_note(merge_request)
-          notification_service.reassigned_merge_request(merge_request, current_user)
-        end
+    def handle_changes(merge_request)
+      if merge_request.previous_changes.include?('target_branch')
+        create_branch_change_note(merge_request, 'target',
+                                  merge_request.previous_changes['target_branch'].first,
+                                  merge_request.target_branch)
+      end
 
-        if merge_request.previous_changes.include?('title')
-          create_title_change_note(merge_request, merge_request.previous_changes['title'].first)
-        end
+      if merge_request.previous_changes.include?('milestone_id')
+        create_milestone_note(merge_request)
+      end
 
-        if merge_request.previous_changes.include?('target_branch') ||
-            merge_request.previous_changes.include?('source_branch')
-          merge_request.mark_as_unchecked
-        end
+      if merge_request.previous_changes.include?('assignee_id')
+        create_assignee_note(merge_request)
+        notification_service.reassigned_merge_request(merge_request, current_user)
+      end
 
-        merge_request.create_new_cross_references!(current_user)
-        execute_hooks(merge_request, 'update')
+      if merge_request.previous_changes.include?('title')
+        create_title_change_note(merge_request, merge_request.previous_changes['title'].first)
       end
 
-      merge_request
+      if merge_request.previous_changes.include?('target_branch') ||
+          merge_request.previous_changes.include?('source_branch')
+        merge_request.mark_as_unchecked
+      end
     end
   end
 end
diff --git a/app/services/system_hooks_service.rb b/app/services/system_hooks_service.rb
index 9a5fe4af9dd..8b5143e1eb7 100644
--- a/app/services/system_hooks_service.rb
+++ b/app/services/system_hooks_service.rb
@@ -33,17 +33,7 @@ class SystemHooksService
         )
       end
     when Project
-      owner = model.owner
-
-      data.merge!({
-        name: model.name,
-        path: model.path,
-        path_with_namespace: model.path_with_namespace,
-        project_id: model.id,
-        owner_name: owner.name,
-        owner_email: owner.respond_to?(:email) ?  owner.email : "",
-        project_visibility: Project.visibility_levels.key(model.visibility_level_field).downcase
-      })
+      data.merge!(project_data(model))
     when User
       data.merge!({
         name: model.name,
@@ -51,16 +41,7 @@ class SystemHooksService
         user_id: model.id
       })
     when ProjectMember
-      data.merge!({
-        project_name: model.project.name,
-        project_path: model.project.path,
-        project_path_with_namespace: model.project.path_with_namespace,
-        project_id: model.project.id,
-        user_name: model.user.name,
-        user_email: model.user.email,
-        access_level: model.human_access,
-        project_visibility: Project.visibility_levels.key(model.project.visibility_level_field).downcase
-      })
+      data.merge!(project_member_data(model))
     when Group
       owner = model.owner
 
@@ -72,15 +53,7 @@ class SystemHooksService
         owner_email: owner.respond_to?(:email) ? owner.email : nil,
       )
     when GroupMember
-      data.merge!(
-        group_name: model.group.name,
-        group_path: model.group.path,
-        group_id: model.group.id,
-        user_name: model.user.name,
-        user_email: model.user.email,
-        user_id: model.user.id,
-        group_access: model.human_access,
-      )
+      data.merge!(group_member_data(model))
     end
   end
 
@@ -96,4 +69,43 @@ class SystemHooksService
       "#{model.class.name.downcase}_#{event.to_s}"
     end
   end
+
+  def project_data(model)
+    owner = model.owner
+
+    {
+      name: model.name,
+      path: model.path,
+      path_with_namespace: model.path_with_namespace,
+      project_id: model.id,
+      owner_name: owner.name,
+      owner_email: owner.respond_to?(:email) ?  owner.email : "",
+      project_visibility: Project.visibility_levels.key(model.visibility_level_field).downcase
+    }
+  end
+
+  def project_member_data(model)
+    {
+      project_name: model.project.name,
+      project_path: model.project.path,
+      project_path_with_namespace: model.project.path_with_namespace,
+      project_id: model.project.id,
+      user_name: model.user.name,
+      user_email: model.user.email,
+      access_level: model.human_access,
+      project_visibility: Project.visibility_levels.key(model.project.visibility_level_field).downcase
+    }
+  end
+
+  def group_member_data(model)
+    {
+      group_name: model.group.name,
+      group_path: model.group.path,
+      group_id: model.group.id,
+      user_name: model.user.name,
+      user_email: model.user.email,
+      user_id: model.user.id,
+      group_access: model.human_access,
+    }
+  end
 end
diff --git a/lib/gitlab/google_code_import/importer.rb b/lib/gitlab/google_code_import/importer.rb
index 03c410726a5..87fee28dc01 100644
--- a/lib/gitlab/google_code_import/importer.rb
+++ b/lib/gitlab/google_code_import/importer.rb
@@ -30,7 +30,7 @@ module Gitlab
 
       def user_map
         @user_map ||= begin
-          user_map = Hash.new do |hash, user| 
+          user_map = Hash.new do |hash, user|
             # Replace ... by \.\.\., so `johnsm...@gmail.com` isn't autolinked.
             Client.mask_email(user).sub("...", "\\.\\.\\.")
           end
@@ -76,18 +76,7 @@ module Gitlab
           attachments = format_attachments(raw_issue["id"], 0, issue_comment["attachments"])
 
           body = format_issue_body(author, date, content, attachments)
-
-          labels = []
-          raw_issue["labels"].each do |label|
-            name = nice_label_name(label)
-            labels << name
-
-            unless @known_labels.include?(name)
-              create_label(name)
-              @known_labels << name
-            end
-          end
-          labels << nice_status_name(raw_issue["status"])
+          labels = import_issue_labels(raw_issue)
 
           assignee_id = nil
           if raw_issue.has_key?("owner")
@@ -110,6 +99,7 @@ module Gitlab
             assignee_id:  assignee_id,
             state:        raw_issue["state"] == "closed" ? "closed" : "opened"
           )
+
           issue.add_labels_by_names(labels)
 
           if issue.iid != raw_issue["id"]
@@ -120,6 +110,23 @@ module Gitlab
         end
       end
 
+      def import_issue_labels(raw_issue)
+        labels = []
+
+        raw_issue["labels"].each do |label|
+          name = nice_label_name(label)
+          labels << name
+
+          unless @known_labels.include?(name)
+            create_label(name)
+            @known_labels << name
+          end
+        end
+
+        labels << nice_status_name(raw_issue["status"])
+        labels
+      end
+
       def import_issue_comments(issue, comments)
         Note.transaction do
           while raw_comment = comments.shift
@@ -172,7 +179,7 @@ module Gitlab
           "#5cb85c"
         when "Status: Started"
           "#8e44ad"
-        
+
         when "Priority: Critical"
           "#ffcfcf"
         when "Priority: High"
@@ -181,7 +188,7 @@ module Gitlab
           "#fff5cc"
         when "Priority: Low"
           "#cfe9ff"
-        
+
         when "Type: Defect"
           "#d9534f"
         when "Type: Enhancement"
@@ -249,8 +256,8 @@ module Gitlab
         end
 
         if raw_updates.has_key?("cc")
-          cc = raw_updates["cc"].map do |l| 
-            deleted = l.start_with?("-") 
+          cc = raw_updates["cc"].map do |l|
+            deleted = l.start_with?("-")
             l = l[1..-1] if deleted
             l = user_map[l]
             l = "~~#{l}~~" if deleted
@@ -261,8 +268,8 @@ module Gitlab
         end
 
         if raw_updates.has_key?("labels")
-          labels = raw_updates["labels"].map do |l| 
-            deleted = l.start_with?("-") 
+          labels = raw_updates["labels"].map do |l|
+            deleted = l.start_with?("-")
             l = l[1..-1] if deleted
             l = nice_label_name(l)
             l = "~~#{l}~~" if deleted
@@ -278,45 +285,39 @@ module Gitlab
 
         if raw_updates.has_key?("blockedOn")
           blocked_ons = raw_updates["blockedOn"].map do |raw_blocked_on|
-            name, id = raw_blocked_on.split(":", 2)
-
-            deleted = name.start_with?("-") 
-            name = name[1..-1] if deleted
-
-            text =
-              if name == project.import_source
-                "##{id}"
-              else
-                "#{project.namespace.path}/#{name}##{id}"
-              end
-            text = "~~#{text}~~" if deleted
-            text
+            format_blocking_updates(raw_blocked_on)
           end
+
           updates << "*Blocked on: #{blocked_ons.join(", ")}*"
         end
 
         if raw_updates.has_key?("blocking")
           blockings = raw_updates["blocking"].map do |raw_blocked_on|
-            name, id = raw_blocked_on.split(":", 2)
-            
-            deleted = name.start_with?("-") 
-            name = name[1..-1] if deleted
-
-            text =
-              if name == project.import_source
-                "##{id}"
-              else
-                "#{project.namespace.path}/#{name}##{id}"
-              end
-            text = "~~#{text}~~" if deleted
-            text
+            format_blocking_updates(raw_blocked_on)
           end
+
           updates << "*Blocking: #{blockings.join(", ")}*"
         end
 
         updates
       end
 
+      def format_blocking_updates(raw_blocked_on)
+        name, id = raw_blocked_on.split(":", 2)
+
+        deleted = name.start_with?("-")
+        name = name[1..-1] if deleted
+
+        text =
+          if name == project.import_source
+            "##{id}"
+          else
+            "#{project.namespace.path}/#{name}##{id}"
+          end
+        text = "~~#{text}~~" if deleted
+        text
+      end
+
       def format_attachments(issue_id, comment_id, raw_attachments)
         return [] unless raw_attachments
 
@@ -325,7 +326,7 @@ module Gitlab
 
           filename = attachment["fileName"]
           link = "https://storage.googleapis.com/google-code-attachments/#{@repo.name}/issue-#{issue_id}/comment-#{comment_id}/#{filename}"
-          
+
           text = "[#{filename}](#{link})"
           text = "!#{text}" if filename =~ /\.(png|jpg|jpeg|gif|bmp|tiff)\z/i
           text
diff --git a/lib/gitlab/inline_diff.rb b/lib/gitlab/inline_diff.rb
index 99e7b529ba9..44507bde25d 100644
--- a/lib/gitlab/inline_diff.rb
+++ b/lib/gitlab/inline_diff.rb
@@ -11,48 +11,71 @@ module Gitlab
         indexes.each do |index|
           first_line = diff_arr[index+1]
           second_line = diff_arr[index+2]
-          max_length = [first_line.size, second_line.size].max
 
           # Skip inline diff if empty line was replaced with content
           next if first_line == "-\n"
 
-          first_the_same_symbols = 0
-          (0..max_length + 1).each do |i|
-            first_the_same_symbols = i - 1
-            if first_line[i] != second_line[i] && i > 0
-              break
-            end
-          end
+          first_token = find_first_token(first_line, second_line)
+          apply_first_token(diff_arr, index, first_token)
+
+          last_token = find_last_token(first_line, second_line, first_token)
+          apply_last_token(diff_arr, index, last_token)
+        end
+
+        diff_arr
+      end
+
+      def apply_first_token(diff_arr, index, first_token)
+        start = first_token + START
+
+        if first_token.empty?
+          # In case if we remove string of spaces in commit
+          diff_arr[index+1].sub!("-", "-" => "-#{START}")
+          diff_arr[index+2].sub!("+", "+" => "+#{START}")
+        else
+          diff_arr[index+1].sub!(first_token, first_token => start)
+          diff_arr[index+2].sub!(first_token, first_token => start)
+        end
+      end
 
-          first_token = first_line[0..first_the_same_symbols][1..-1]
-          start = first_token + START
+      def apply_last_token(diff_arr, index, last_token)
+        # This is tricky: escape backslashes so that `sub` doesn't interpret them
+        # as backreferences. Regexp.escape does NOT do the right thing.
+        replace_token = FINISH + last_token.gsub(/\\/, '\&\&')
+        diff_arr[index+1].sub!(/#{Regexp.escape(last_token)}$/, replace_token)
+        diff_arr[index+2].sub!(/#{Regexp.escape(last_token)}$/, replace_token)
+      end
+
+      def find_first_token(first_line, second_line)
+        max_length = [first_line.size, second_line.size].max
+        first_the_same_symbols = 0
+
+        (0..max_length + 1).each do |i|
+          first_the_same_symbols = i - 1
 
-          if first_token.empty?
-            # In case if we remove string of spaces in commit
-            diff_arr[index+1].sub!("-", "-" => "-#{START}")
-            diff_arr[index+2].sub!("+", "+" => "+#{START}")
-          else
-            diff_arr[index+1].sub!(first_token, first_token => start)
-            diff_arr[index+2].sub!(first_token, first_token => start)
+          if first_line[i] != second_line[i] && i > 0
+            break
           end
+        end
+
+        first_line[0..first_the_same_symbols][1..-1]
+      end
+
+      def find_last_token(first_line, second_line, first_token)
+        max_length = [first_line.size, second_line.size].max
+        last_the_same_symbols = 0
+
+        (1..max_length + 1).each do |i|
+          last_the_same_symbols = -i
+          shortest_line = second_line.size > first_line.size ? first_line : second_line
 
-          last_the_same_symbols = 0
-          (1..max_length + 1).each do |i|
-            last_the_same_symbols = -i
-            shortest_line = second_line.size > first_line.size ? first_line : second_line
-            if ( first_line[-i] != second_line[-i] ) || "#{first_token}#{START}".size == shortest_line[1..-i].size
-              break
-            end
+          if (first_line[-i] != second_line[-i]) || "#{first_token}#{START}".size == shortest_line[1..-i].size
+            break
           end
-          last_the_same_symbols += 1
-          last_token = first_line[last_the_same_symbols..-1]
-          # This is tricky: escape backslashes so that `sub` doesn't interpret them
-          # as backreferences. Regexp.escape does NOT do the right thing.
-          replace_token = FINISH + last_token.gsub(/\\/, '\&\&')
-          diff_arr[index+1].sub!(/#{Regexp.escape(last_token)}$/, replace_token)
-          diff_arr[index+2].sub!(/#{Regexp.escape(last_token)}$/, replace_token)
         end
-        diff_arr
+
+        last_the_same_symbols += 1
+        first_line[last_the_same_symbols..-1]
       end
 
       def _indexes_of_changed_lines(diff_arr)
diff --git a/spec/lib/gitlab/diff/inline_diff_spec.rb b/spec/lib/gitlab/inline_diff_spec.rb
index 2e0a05088cc..2e0a05088cc 100644
--- a/spec/lib/gitlab/diff/inline_diff_spec.rb
+++ b/spec/lib/gitlab/inline_diff_spec.rb