This SCRIPT finds all the .h files in a current directory and add include guard macro on the basis of filename.

include_guards_insertion.rb

def update_file(file_name, incl)
  file = File.open(file_name, "r")
  data = file.read
  file.close
  unless data.include? "#ifndef"
    final_data = "#ifndef #{incl}\n#define #{incl}\n#{data}\n#endif\n/*Include guards add by Zain*/"
    file = File.open(file_name, "w+")
    file.write(final_data)
    file.close
  end	
  
end




Dir.glob("**/*.h") do |file_name|
  
  file_name.gsub(/([^\/]*)$/).each do |x|
    if x != "" 
	update_file(file_name, x.gsub(/[.]/,"_").upcase)
    else
	next
    end
		
  end
 
end