Class VCS < Object

# File tool/vcs.rb, line 20
def self.detect(path)
  @@dirs.each do |dir, klass|
    return klass.new(path) if File.directory?(File.join(path, dir))
    prev = path
    loop {
      curr = File.realpath(File.join(prev, '..'))
      break if curr == prev   # stop at the root directory
      return klass.new(path) if File.directory?(File.join(curr, dir))
      prev = curr
    }
  end
  raise VCS::NotFoundError, "does not seem to be under a vcs: #{path}"
end

# File tool/vcs.rb, line 34
def initialize(path)
  @srcdir = path
  super()
end

# File tool/vcs.rb, line 16
def self.register(dir)
  @@dirs << [dir, self]
end

# File tool/vcs.rb, line 41
def get_revisions(path)
  path = relative_to(path)
  last, changed, modified, *rest = Dir.chdir(@srcdir) {self.class.get_revisions(path)}
  last or raise VCS::NotFoundError, "last revision not found"
  changed or raise VCS::NotFoundError, "changed revision not found"
  if modified
    /\A(\d+)-(\d+)-(\d+)\D(\d+):(\d+):(\d+(?:\.\d+)?)\s*(?:Z|([-+]\d\d)(\d\d))\z/ =~ modified or
      raise "unknown time format - #{modified}"
    modified = Time.mktime(*($~[1..6] + [$7 ? "#{$7}:#{$8}" : "+00:00"]))
  end
  return last, changed, modified, *rest
end

# File tool/vcs.rb, line 54
def relative_to(path)
  if path
    srcdir = File.realpath(@srcdir)
    path = File.realpath(path)
    list1 = srcdir.split(%r{/})
    list2 = path.split(%r{/})
    while !list1.empty? && !list2.empty? && list1.first == list2.first
      list1.shift
      list2.shift
    end
    if list1.empty? && list2.empty?
      "."
    else
      ([".."] * list1.length + list2).join("/")
    end
  else
    '.'
  end
end