web/_plugins/posts-lastmod-hook.rb

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# Check for changed posts
Jekyll::Hooks.register :posts, :post_init do |post|
commit_num = `git rev-list --count HEAD "#{ post.path }"`
if commit_num.to_i > 1
lastmod_date = `git log -1 --pretty="%ad" --date=iso "#{ post.path }"`
post.data['lastmod'] = lastmod_date
end
end