gistfile1.txt

def log(text)
  puts "#{'=' * 3} #{text} #{'=' * 3}"
  $stdout.flush
end

def git_root
  root = File.join(ENV['ProgramFiles(x86)'] || ENV['ProgramFiles'], "Git", "bin")
  return root if File.exists?(root)
  raise "Cannot find git"
end

def git(*args)
  log "Running git #{args.join(' ')}"
  cmd = File.join(git_root, "git")
  `"#{cmd}" #{args.join(' ')}`
end

def record_commit_distance!(repo, output_file, src_commit, dest_commit = 'HEAD')
  Dir.chdir(repo) do
    commits = git 'log', '--format="%H"', "#{src_commit}..#{dest_commit}", "2>&1"
    distance = commits.split("\n")
    log "Writing #{distance.inspect} to #{output_file}"
    File.open(output_file, "w") do |f|
      f.write(commits)
    end
  end
end