redmine_userpage_macro: mailer fixes

1) render macro without arguments (i.e. {{userpage}}) for mailer correctly
2) render full link path and not relative for mailer, i.e. https://myredmine/path/to/page instead of /path/to/page

Author: giner

redmine_plugins/redmine_userpage_macro/init.rb

@@ -6,20 +6,22 @@
   author 'Stanislav German-Evtushenko'
   description 'Add the userpage macro.'
   author_url 'mailto:[email protected]'
-  version '0.1'
+  version '0.2'
 end
 
 Redmine::WikiFormatting::Macros.register do
   desc "Insert the link to the userpage. Examples: \n\n <pre>{{userpage}}\n{{userpage(project_id, user_login, parent_page)}}</pre>"
   macro :userpage do |obj, args|
     if args[0] and !args[0].empty?
       project_identifier = args[0].strip
-      project_id = Project.find_by_identifier(project_identifier).identifier
+      project = Project.find_by_identifier(project_identifier)
     end
-    
-    project_id = @project.identifier unless project_id
-    return nil unless project_id
-    
+
+    project = @project || (obj && obj.project) unless project
+    return nil unless project
+
+    project_id = project.identifier
+
     if args[1] and !args[1].empty?
       user_login = args[1].strip.downcase
     end
@@ -31,6 +33,7 @@
     user_login = User.current.login unless user_login
     userpage_exists = Wiki.find_page(project_id + ":" + user_login)
     url_class = 'wiki-page' + (userpage_exists ? '' : ' new')
-    h(link_to(user_login, {:controller => 'wiki', :action => 'show', :project_id => project_id, :id => user_login, :parent => parent_page}, :class => url_class))
+    url = url_for(:controller => 'wiki', :action => 'show', :project_id => project_id, :id => user_login, :parent => parent_page, :only_path => @only_path)
+    h(link_to(user_login, url, :class => url_class))
   end
 end