Render format dependent links

app/models/project_services/chat_slash_commands_service.rb

@@ -33,10 +33,11 @@ class ChatSlashCommandsService < Service
     user = find_chat_user(params)
     unless user
       url = authorize_chat_name_url(params)
-      return Gitlab::ChatCommands::Presenter.authorize_chat_name(url)
+      return presenter.authorize_chat_name(url)
     end
 
-    Gitlab::ChatCommands::Command.new(project, user, params).execute
+    Gitlab::ChatCommands::Command.new(project, user,
+      params.merge(presenter_format: presenter_format)).execute
   end
 
   private
@@ -48,4 +49,12 @@ class ChatSlashCommandsService < Service
   def authorize_chat_name_url(params)
     ChatNames::AuthorizeUserService.new(self, params).execute
   end
+
+  def presenter
+    Gitlab::ChatCommands::Presenter.new(presenter_format)
+  end
+
+  def presenter_format
+    throw NotImplementedError
+  end
 end

app/models/project_services/mattermost_slash_commands_service.rb

@@ -18,4 +18,8 @@ class MattermostSlashCommandsService < ChatService
   def to_param
     'mattermost_slash_commands'
   end
+
+  def presenter_format
+    'mattermost'
+  end
 end

app/models/project_services/slack_slash_commands_service.rb

@@ -12,4 +12,8 @@ class SlackSlashCommandsService < ChatSlashCommandsService
   def to_param
     'slack_slash_commands'
   end
+
+  def presenter_format
+    'slack'
+  end
 end

lib/gitlab/chat_commands/base_command.rb

@@ -42,6 +42,10 @@ module Gitlab
       def find_by_iid(iid)
         collection.find_by(iid: iid)
       end
+
+      def presenter
+        Gitlab::ChatCommands::Presenter.new(params[:presenter_format])
+      end
     end
   end
 end

lib/gitlab/chat_commands/command.rb

@@ -48,15 +48,15 @@ module Gitlab
       end
 
       def help(messages)
-        Mattermost::Presenter.help(messages, params[:command])
+        presenter.help(messages, params[:command])
       end
 
       def access_denied
-        Mattermost::Presenter.access_denied
+        presenter.access_denied
       end
 
       def present(resource)
-        Mattermost::Presenter.present(resource)
+        presenter.present(resource)
       end
     end
   end

lib/gitlab/chat_commands/presenter.rb

 module Gitlab
   class ChatCommands
     class Presenter
-      class << self
       include Gitlab::Routing.url_helpers
 
+      attr_reader :format
+
+      def initialize(format)
+        @format = format
+      end
+
       def authorize_chat_name(url)
         message = if url
-                      ":wave: Hi there! Before I do anything for you, please <#{url}|connect your GitLab account>."
+                    ":wave: Hi there! Before I do anything for you, please #{link(url, 'connect your GitLab account')}."
                   else
                     ":sweat_smile: Couldn't identify you, nor can I autorize you!"
                   end
@@ -44,7 +49,7 @@ module Gitlab
       end
 
       def access_denied
-          ephemeral_response("Whoops! That action is not allowed. This incident will be <https://xkcd.com/838/|reported>.")
+        ephemeral_response("Whoops! That action is not allowed. This incident will be #{link('https://xkcd.com/838/', 'reported')}.")
       end
 
       private
@@ -89,7 +94,7 @@ module Gitlab
         reference = resource.try(:to_reference) || resource.try(:id)
         title = resource.try(:title) || resource.try(:name)
 
-          "<#{url(resource)}|#{reference} #{title}>"
+        link(url(resource), "#{reference} #{title}")
       end
 
       def header_with_list(header, items)
@@ -127,6 +132,13 @@ module Gitlab
           status: 200
         }
       end
+
+      def link(url, title)
+        case format
+        when 'slack'      then "<#{url}|#{title}>"
+        when 'mattermost' then "[#{title}](#{url})"
+        else              then title
+        end
       end
     end
   end