Add specific markdown_preview route for Wikis

app/controllers/projects/wikis_controller.rb

@@ -88,6 +88,20 @@ class Projects::WikisController < Projects::ApplicationController
     )
   end
 
+  def markdown_preview
+    text = params[:text]
+
+    ext = Gitlab::ReferenceExtractor.new(@project, current_user, current_user)
+    ext.analyze(text)
+
+    render json: {
+      body: view_context.markdown(text, pipeline: :wiki, project_wiki: @project_wiki),
+      references: {
+        users: ext.users.map(&:username)
+      }
+    }
+  end
+
   def git_access
   end
 

app/views/layouts/project.html.haml

@@ -5,10 +5,14 @@
 
 - content_for :scripts_body_top do
   - project = @target_project || @project
+  - if @project_wiki
+    - markdown_preview_path = namespace_project_wikis_markdown_preview_path(project.namespace, project)
+  - else
+    - markdown_preview_path = markdown_preview_namespace_project_path(project.namespace, project)
   - if current_user
     :javascript
       window.project_uploads_path = "#{namespace_project_uploads_path project.namespace,project}";
-      window.markdown_preview_path = "#{markdown_preview_namespace_project_path(project.namespace, project)}";
+      window.markdown_preview_path = "#{markdown_preview_path}";
 
 - content_for :scripts_body do
   = render "layouts/init_auto_complete" if current_user

config/routes.rb

@@ -575,6 +575,7 @@ Rails.application.routes.draw do
           # Order matters to give priority to these matches
           get '/wikis/git_access', to: 'wikis#git_access'
           get '/wikis/pages', to: 'wikis#pages', as: 'wiki_pages'
+          post '/wikis/markdown_preview', to:'wikis#markdown_preview'
           post '/wikis', to: 'wikis#create'
 
           get '/wikis/*id/history', to: 'wikis#history', as: 'wiki_history', constraints: WIKI_SLUG_ID