Add last_modified_at to MRG generator and align with other hooks

Author: dshevtsov

_plugins/generators/mrg_pages.rb

@@ -49,6 +49,7 @@ def generate(site)
         )
         mrg_topic.content = metadata['content']
         mrg_topic.data['title'] = metadata['title']
+        mrg_topic.data['last_modified_at'] = metadata['last_modified_at']
         mrg_topic.process("#{mod}.md")
 
         # Add the newly constructed page object to the rest of pages

_plugins/page-params/github-path.rb

@@ -7,9 +7,12 @@
 # The parameter contains a file path relative to its repository.
 #
 Jekyll::Hooks.register :pages, :post_init do |page|
+
+  # Skip virtual pages like MRG topics
+  next if page.kind_of? Jekyll::PageWithoutAFile
   # Process only files with 'md' and 'html' extensions
   next unless File.extname(page.path).match?(/md|html/)
-  # Do nothing for redirects
+  # Skip redirects
   next if page.name == 'redirect.html'
 
   dir = File.dirname page.path

_plugins/page-params/last-modified-at.rb

@@ -3,12 +3,12 @@
 #
 # This custom plugin dynamically sets the 'last_modified_at' parameter
 # for each page except 'redirect.html' pages.
-# A value of the pararmeter is available as {{ page.last_modified_at }}.
+# A value of the parameter is available as {{ page.last_modified_at }}.
 # The parameter contains date and time of the last commit that changed
 # the original file.
 # For available date formats, refer to https://git-scm.com/docs/git-log#git-log---dateltformatgt
 #
-Jekyll::Hooks.register :pages, :post_init do |page|
+Jekyll::Hooks.register :pages, :pre_render do |page|
   # Do nothing in serving mode
   next if page.site.config['serving']
   # Do nothing if the date is already set
@@ -23,7 +23,7 @@
   dir = File.dirname real_filepath
   filename = File.basename real_filepath
 
-  # Read date of the last committ and assign it to last_modified_at parameter
+  # Read date of the last commit and assign it to last_modified_at parameter
   # of the page.
   page.data['last_modified_at'] =
     `cd #{dir} && git log -1 --format=%cd --date=iso -- #{filename}`.strip