1module Rake
2
3  # Makefile loader to be used with the import file loader.
4  class MakefileLoader
5    include Rake::DSL
6
7    SPACE_MARK = "\0"
8
9    # Load the makefile dependencies in +fn+.
10    def load(fn)
11      lines = File.read fn
12      lines.gsub!(/\\ /, SPACE_MARK)
13      lines.gsub!(/#[^\n]*\n/m, "")
14      lines.gsub!(/\\\n/, ' ')
15      lines.each_line do |line|
16        process_line(line)
17      end
18    end
19
20    private
21
22    # Process one logical line of makefile data.
23    def process_line(line)
24      file_tasks, args = line.split(':', 2)
25      return if args.nil?
26      dependents = args.split.map { |d| respace(d) }
27      file_tasks.scan(/\S+/) do |file_task|
28        file_task = respace(file_task)
29        file file_task => dependents
30      end
31    end
32
33    def respace(str)
34      str.tr SPACE_MARK, ' '
35    end
36  end
37
38  # Install the handler
39  Rake.application.add_loader('mf', MakefileLoader.new)
40end
41