walk.rb

# add an alias to your bash profile with this code as walk
# alias walk='ruby <your file path.rb>'
# Usage
# walk first
# walk next
# walk prev
case ARGV[0]
when "next"
  rev_list = `git rev-list --children --all`
  refs = rev_list.scan(/[a-z0-9]{40}(?= )/)
  refs.unshift(rev_list[/[a-z0-9]{40}/])
  refs.reverse!
 
  head = `git rev-parse HEAD`.chomp
  ref_for_next_commit = refs[refs.index(head) + 1]
 
  if ref_for_next_commit
    puts `git checkout #{ref_for_next_commit}`
  else
    puts "You're already on the latest commit."
  end
when "prev"
  puts `git checkout HEAD^`
when "first"
  first_commit = `git rev-list --max-parents=0 HEAD | tail -n 1`
  puts `git checkout #{first_commit}`
else
  puts "Usage: git-walk next|prev|first"
end