Try and commit trailing spaces now, punk!

git.rb

# Sneak in git commit hooks. Even if people don't run tests, they're likely to run this.

unless Rails.env == "production"

hook = "#{Rails.root}/.git/hooks/pre-commit"
script = <<'END'
#!/usr/bin/env ruby
#
# Reject commits that would introduce trailing spaces.

if system("git-rev-parse --verify HEAD >/dev/null 2>&1")
  against = "HEAD"
else
  # Initial commit: diff against an empty tree object
  against = "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
end

found = `git diff-index --check --cached #{against}`.
        strip.
        split(/\n/).
        select{ |r| r !~ /^[+\-]/ }.
        map{ |r| r[/^[^:]+/] }.
        uniq

found.each do |path|
  system "ruby -p -i'' -e '$_.sub!(/\s+$/, \"\")' \"#{path}\""
end

if found.any?
  puts "There are trailing spaces in your commit. They have been fixed for"
  puts "you, but you must add those fixes to the index (using git add) before you"
  puts "can proceed."
  exit 1
else
  exit 0
end
END

unless File.exist?(hook) && File.read(hook) == script
  File.open(hook, "w") do |f|
    f << script
  end

  require "fileutils"
  FileUtils.chmod 0755, hook
end

end