move logic into legacy_render_context helper method

app/helpers/markup_helper.rb

@@ -115,13 +115,13 @@ module MarkupHelper
     text = wiki_page.content
     return '' unless text.present?
-    context.merge!({
+    context.merge!(
       pipeline: :wiki,
       project: @project,
       project_wiki: @project_wiki,
       page_slug: wiki_page.slug,
       issuable_state_filter_enabled: true
-    })
+    )
     html =
       case wiki_page.format

app/helpers/projects_helper.rb

@@ -252,6 +252,10 @@ module ProjectsHelper
     "xcode://clone?repo=#{CGI.escape(default_url_to_repo(project))}"
   end
+  def legacy_render_context(params)
+    params[:legacy_render] ? { markdown_engine: :redcarpet } : {}
+  end
+
   private
   def get_project_nav_tabs(project, current_user)

app/views/projects/_wiki.html.haml

@@ -2,8 +2,7 @@
   %div{ class: container_class }
     .prepend-top-default.append-bottom-default
       .wiki
-        - context = params[:legacy_render] ? { markdown_engine: :redcarpet} : {}
-        = render_wiki_content(@wiki_home, context)
+        = render_wiki_content(@wiki_home, legacy_render_context(params))
 - else
   - can_create_wiki = can?(current_user, :create_wiki, @project)
   .project-home-empty{ class: [('row-content-block' if can_create_wiki), ('content-block' unless can_create_wiki)] }

app/views/projects/blob/preview.html.haml

@@ -2,8 +2,7 @@
   .diff-content
     - if markup?(@blob.name)
       .file-content.wiki
-        - context = params[:legacy_render] ? { markdown_engine: :redcarpet} : {}
-        = markup(@blob.name, @content, context)
+        = markup(@blob.name, @content, legacy_render_context(params))
     - else
       .file-content.code.js-syntax-highlight
         - unless @diff_lines.empty?

app/views/projects/blob/viewers/_markup.html.haml

 - blob = viewer.blob
-- context = {}
-- if params[:legacy_render]
-  - context[:markdown_engine] = :redcarpet
-- else
+- context = legacy_render_context(params)
+- unless context[:markdown_engine] == :redcarpet
   - context[:rendered] = blob.rendered_markup if blob.respond_to?(:rendered_markup)
 .file-content.wiki
   = markup(blob.name, blob.data, context)

app/views/projects/wikis/_sidebar.html.haml

@@ -12,8 +12,7 @@
     .blocks-container
       .block.block-first
         - if @sidebar_page
-          - context = params[:legacy_render] ? { markdown_engine: :redcarpet} : {}
-          = render_wiki_content(@sidebar_page, context)
+          = render_wiki_content(@sidebar_page, legacy_render_context(params))
         - else
           %ul.wiki-pages
             = render @sidebar_wiki_entries, context: 'sidebar'

app/views/projects/wikis/show.html.haml

@@ -26,7 +26,6 @@
 .prepend-top-default.append-bottom-default
   .wiki
-    - context = params[:legacy_render] ? { markdown_engine: :redcarpet} : {}
-    = render_wiki_content(@page, context)
+    = render_wiki_content(@page, legacy_render_context(params))
 = render 'sidebar'

app/views/search/results/_snippet_blob.html.haml

@@ -21,8 +21,7 @@
       .file-content.wiki
         - snippet_chunks.each do |chunk|
           - unless chunk[:data].empty?
-            - context = params[:legacy_render] ? { markdown_engine: :redcarpet} : {}
-            = markup(snippet.file_name, chunk[:data], context)
+            = markup(snippet.file_name, chunk[:data], legacy_render_context(params))
           - else
             .file-content.code
               .nothing-here-block Empty file

spec/helpers/projects_helper_spec.rb

@@ -470,4 +470,16 @@ describe ProjectsHelper do
       end
     end
   end
+
+  describe '#legacy_render_context' do
+    it 'returns the redcarpet engine' do
+      params = { legacy_render: '1' }
+
+      expect(helper.legacy_render_context(params)).to include(markdown_engine: :redcarpet)
+    end
+
+    it 'returns nothing' do
+      expect(helper.legacy_render_context({})).to be_empty
+    end
+  end
 end