awesome_file works with closed file

[solutus]

Test case:
echo "a\nb\nc" > /tmp/test
irb
irb > File.open("/tmp/test") { |file| file.each_line { |line| puts "Got #{ line.dump }" } }

Log:
Got "a\nb\nc\n"
IOError: closed stream
from /Users/user/.rvm/gems/ruby-2.1.0-preview1/gems/awesome_print-1.2.0/lib/awesome_print/formatter.rb:199:in `directory?'

Root cause: File.directory?(f) asks closed f(ile)

It looks like it isn't necessary to do this check. If ls -d runs for file, '-d' - is ignored

[imajes]

Can we get a test with this? I know this is crazy old but it'd be great to get this merged in!

[gerrywastaken]

Running the Travis build against this PR: https://travis-ci.org/gerrywastaken/awesome_print/builds/129617661

@solutus I haven't yet looked at the change, but a test would indeed be helpful.

[imajes]

As a note, we should fix this, but ls isn't portable. We need to figure the right way to do that (wrt the recent ENV['HOME'] piece, portability is clearly more important than we might have considered!)