In addition to --git-dir, otherwise the current working tree will be used (if a .git directory is present, even if the --git-dir points elsewhere)

To support Windows, a very simple bit of code can be added:

if RUBY_PLATFORM =~ /mswin32/
  require "win32/open3"
end

I put it at the bottom of lib\open3_detach.rb, but really it can go anywhere, as long as it's imported after - it overwrites Open3.popen3.

Users will need to install the "win32-open3" gem, which is simple.

Even though repo.head and repo.heads.first are the same, the commit is different:

irb(main):001:0> require 'grit'
=> true
irb(main):002:0> repo = Grit::Repo.new(".")
=> #<Grit::Repo "S:/.git">
irb(main):003:0> repo.heads
=> [#<Grit::Head "master">, #<Grit::Head "ben">, #<Grit::Head "feature1">, #<Grit::Head "nokogiri">]
irb(main):004:0> repo.head
=> #<Grit::Head "master">
irb(main):005:0> repo.heads.first
=> #<Grit::Head "master">
irb(main):006:0> repo.head.commit
=> ""
irb(main):007:0> repo.heads.first.commit
=> #<Grit::Commit "743f50dad6e5646e4e1d978998b61d3a774ba64a">

I need to be able to get the remote origin of the git repository that you can get at command-line via "git remote show origin". It'd be nice if Grit could provide this. Is there a way in current version to do it? (Didn't see a way in the docs.)

Would recommend either using generic test data, relative paths or .gitignoring the test dir. Currently all examples point to creator's directories. Would just be nice to have these running out of the box.