Modify a file line inline in chef

noit.rb

  ruby_block "configure #{p} module" do
    block do
      require 'chef/util/file_edit'
      nc = Chef::Util::FileEdit.new("/etc/reconnoiter/noit.conf")
      nc.insert_line_after_match(/lua.*noit.module.smtp/, "<module loader=\"lua\" name=\"#{p}\" object=\"noit.module.#{p}\"/>")
      nc.write_file
      Chef::Log.info "Inserted module config for #{p}"
    end

http://tickets.opscode.com/browse/CHEF-78?focusedCommentId=10781&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-10781