module ParentPaths

From the given starting path, scan upward through the file hierachy until a particular criteria is met. The criteria is determined by a block that receives the path of the next directory in the hierarchy.

If a starting path is not provided, it is assumed to be the path of the file that calls this method.

# File lib/parent_paths.rb, line 11
def self.find(start = nil, &criteria)
  start ||= caller_path
  if criteria.call(start)
    return start
  else
    parent = Pathname.new(start).parent.to_s
    if start == parent
      nil
    else
      find parent, &criteria
    end
  end
end

From the given starting path, scan upward through the file hierachy until a particular filename is discovered.

If a starting path is not provided, it is assumed to be the path of the file that calls this method.

# File lib/parent_paths.rb, line 30
def self.find_owner(filename, start = nil)
  start ||= caller_path
  find(start) { |path| File.exist?(File.join(path, filename)) }
end

Returns the path of the file that calls the method that calls caller_path. For example if, foo.rb#foo calls caller_path, calling foo.rb#foo will return the current file.

# File lib/parent_paths.rb, line 40
def self.caller_path
  matches = caller(2).first.match(/(.*):\d+:in `/)
  File.expand_path(matches[1])
end