DRY up diff_for_path actions

1. Move render method to a concern, not a helper.
2. Let DiffHelper#diff_options automatically add the path option.
3. Move more instance var definitions to before filters.

1 files changed, 27 insertions, 34 deletions

diff --git a/app/controllers/projects/commit_controller.rb b/app/controllers/projects/commit_controller.rb
index 810653b4264..727e84b40a1 100644
--- a/app/controllers/projects/commit_controller.rb
+++ b/app/controllers/projects/commit_controller.rb
@@ -3,6 +3,7 @@
 # Not to be confused with CommitsController, plural.
 class Projects::CommitController < Projects::ApplicationController
   include CreatesCommit
+  include DiffForPath
   include DiffHelper
 
   # Authorize
@@ -11,29 +12,14 @@ class Projects::CommitController < Projects::ApplicationController
   before_action :authorize_update_build!, only: [:cancel_builds, :retry_builds]
   before_action :authorize_read_commit_status!, only: [:builds]
   before_action :commit
-  before_action :define_show_vars, only: [:show, :builds]
+  before_action :define_commit_vars, only: [:show, :diff_for_path, :builds]
+  before_action :define_status_vars, only: [:show, :builds]
+  before_action :define_note_vars, only: [:show, :diff_for_path]
   before_action :authorize_edit_tree!, only: [:revert, :cherry_pick]
 
   def show
     apply_diff_view_cookie!
 
-    @grouped_diff_notes = commit.notes.grouped_diff_notes
-    @notes = commit.notes.non_diff_notes.fresh
-
-    Banzai::NoteRenderer.render(
-      @grouped_diff_notes.values.flatten + @notes,
-      @project,
-      current_user,
-    )
-
-    @note = @project.build_commit_note(commit)
-
-    @noteable = @commit
-    @comments_target = {
-      noteable_type: 'Commit',
-      commit_id: @commit.id
-    }
-
     respond_to do |format|
       format.html
       format.diff  { render text: @commit.to_diff }
@@ -42,21 +28,7 @@ class Projects::CommitController < Projects::ApplicationController
   end
 
   def diff_for_path
-    return git_not_found! unless commit
-
-    opts = diff_options
-    opts[:ignore_whitespace_change] = true if params[:format] == 'diff'
-
-    diffs = commit.diffs(opts.merge(paths: [params[:path]]))
-    diff_refs = [commit.parent || commit, commit]
-
-    @comments_target = {
-      noteable_type: 'Commit',
-      commit_id: @commit.id
-    }
-    @grouped_diff_notes = {}
-
-    render_diff_for_path(diffs, diff_refs, @project)
+    render_diff_for_path(@diffs, @commit.diff_refs, @project)
   end
 
   def builds
@@ -132,7 +104,7 @@ class Projects::CommitController < Projects::ApplicationController
     @ci_builds ||= Ci::Build.where(pipeline: pipelines)
   end
 
-  def define_show_vars
+  def define_commit_vars
     return git_not_found! unless commit
 
     opts = diff_options
@@ -140,7 +112,28 @@ class Projects::CommitController < Projects::ApplicationController
 
     @diffs = commit.diffs(opts)
     @notes_count = commit.notes.count
+  end
+
+  def define_note_vars
+    @grouped_diff_notes = commit.notes.grouped_diff_notes
+    @notes = commit.notes.non_diff_notes.fresh
+
+    Banzai::NoteRenderer.render(
+      @grouped_diff_notes.values.flatten + @notes,
+      @project,
+      current_user,
+    )
+
+    @note = @project.build_commit_note(commit)
+
+    @noteable = @commit
+    @comments_target = {
+      noteable_type: 'Commit',
+      commit_id: @commit.id
+    }
+  end
 
+  def define_status_vars
     @statuses = CommitStatus.where(pipeline: pipelines)
     @builds = Ci::Build.where(pipeline: pipelines)
   end