Bump version, improve how version is stored for better commit history (#2526)

app/helpers/http_helper.rb

 # frozen_string_literal: true
 
 module HttpHelper
-  USER_AGENT = "#{HTTP::Request::USER_AGENT} (Mastodon/#{Mastodon::VERSION}; +http://#{Rails.configuration.x.local_domain}/)"
+  USER_AGENT = "#{HTTP::Request::USER_AGENT} (Mastodon/#{Mastodon::Version}; +http://#{Rails.configuration.x.local_domain}/)"
 
   def http_client(options = {})
     timeout = { write: 10, connect: 10, read: 10 }.merge(options)

app/presenters/instance_presenter.rb

@@ -27,6 +27,6 @@ class InstancePresenter
   end
 
   def version_number
-    Mastodon::VERSION
+    Mastodon::Version
   end
 end

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

@@ -4,4 +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 }
+node(:version)     { Mastodon::Version }

lib/mastodon/version.rb

 # frozen_string_literal: true
 
 module Mastodon
-  VERSION = '1.2.2'
+  module Version
+    module_function
+
+    def major
+      1
+    end
+
+    def minor
+      3
+    end
+
+    def patch
+      0
+    end
+
+    def pre
+      nil
+    end
+
+    def to_a
+      [major, minor, patch, pre].compact
+    end
+
+    def to_s
+      to_a.join('.')
+    end
+  end
 end