Adds version to about/more and API (#2181)

* Adds version.

* Cleans up code.

* Removes standalone endpoint and adds version to instance endpoint.

* Addresses feedback from #2181.

app/presenters/instance_presenter.rb

@@ -25,4 +25,8 @@ class InstancePresenter
   def domain_count
     Rails.cache.fetch('distinct_domain_count') { Account.distinct.count(:domain) }
   end
+
+  def version_number
+    Mastodon::VERSION
+  end
 end

app/views/about/_version.html.haml

@@ -0,0 +1,4 @@
+.panel
+  .panel-header= t 'about.version'
+  .panel-body
+    %strong= version.version_number

app/views/about/more.html.haml

@@ -30,3 +30,4 @@
     .sidebar
       = render 'contact', contact: @instance_presenter
       = render 'links'
+      = render 'version', version: @instance_presenter

app/views/api/v1/instances/show.rabl

@@ -4,3 +4,4 @@ node(:uri)         { site_hostname }
 node(:title)       { Setting.site_title }
 node(:description) { Setting.site_description }
 node(:email)       { Setting.site_contact_email }
+node(:version)     { Mastodon::VERSION }

config/application.rb

@@ -9,6 +9,7 @@ Bundler.require(*Rails.groups)
 require_relative '../app/lib/exceptions'
 require_relative '../lib/paperclip/gif_transcoder'
 require_relative '../lib/paperclip/video_transcoder'
+require_relative '../lib/mastodon/version'
 
 Dotenv::Railtie.load
 

config/locales/en.yml

@@ -29,6 +29,7 @@ en:
     terms: Terms
     user_count_after: users
     user_count_before: Home to
+    version: Version
   accounts:
     follow: Follow
     followers: Followers

lib/mastodon/version.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+module Mastodon
+  VERSION = '1.2.2'
+end