Generating a graph (DOT format) from C/C++ includes

make-include-graph.rb

#!/usr/bin/env ruby
# Output a DOT file of the include structure of a project
#
# Usage:
#   cd <the include path of the project>
#   <path of this script>/make-include-graph.rb > includes.dot

require 'find'

def output_edges(path)
	File.open(path) do |f|
		f.each_line do |line|
			match = line.match(/^\s*#\s*include\s*[<"](.*)[">]/)
			if match
				puts "\t\"#{path}\" -> \"#{match[1]}\";"
			end
		end
	end
end

puts 'digraph includes {'
Find.find('.') do |path|
	unless FileTest.directory?(path)
		path = path[2..-1]
		output_edges(path)
	end
end
puts '}'