2018-09-08 builderscon tokyo 2018 LT -> https://speakerdeck.com/onk/2018-09-08-parse-cpanfile-with-ruby

7. requires 'Plack';
...
on test => sub {
requires 'Test2', '1.302138';
...
}

8. $ ruby -cw cpanfile
Syntax OK

13. # requires CPAN Module
requires 'Plack';
...
# env on <ENV> sub
on test => sub {
# 2
requires 'Test2', '1.302138';
...
}

15. requires 'Plack';

16. on test => sub {
requires 'Test2', '1.302138';
}

17. on({
test => sub { requires 'Test2', '1.302138'; }
})

18. on({
test => sub { requires 'Test2', '1.302138'; }
})

19. on({
test => sub { requires 'Test2', '1.302138'; }
})

20. on({
test => sub { requires 'Test2', '1.302138'; }
})

21. on({
test => sub { requires 'Test2', '1.302138'; }
})

22. on({
test => sub { requires 'Test2', '1.302138'; }
})

24. requires ‘Plack';
requires 'Test2', '1.302138';

25. @requires = []
def requires(module_name, version = nil)
@requires << [module_name, version]
end

26. on({
test => sub { requires 'Test2', '1.302138'; }
})

27. def on(_hash)
# nop
end

28. on({
test => sub { requires 'Test2', '1.302138'; }
})

29. def test
"test"
end

30. on({
test => sub { requires 'Test2', '1.302138'; }
})

31. def sub
yield
end

32. def sub
-> { yield }
end
def on(hash)
hash.each do |env, sub|
sub.call
end
end

33. eval File.read("./cpanfile")
pp @requires

34. $ ruby cpanfile_parser.rb
[["Plack", nil], ["Test2", "1.302138"]]