require 'hpricot'
require 'open-uri'

class RemoteResources

  class URLNotFoundException < Exception
  end

  def self.hpricot_document(url)
    Hpricot(open_remote(url))
  end

  # Loads YAML-encoded data from a remote URL
  def self.remote_yaml_document(document_url)
    YAML.load(open_remote(document_url))
  end

  # returns a listing of the files/folders at this URL
  def self.repository_list(url)
    self.read_svn_repository(url).split("\n").collect { |entry| entry.strip.gsub(/\/$/, '') }
  end

  # Returns a hash of info about this repository URL
  def self.repository_info(url)
    YAML.parse(self.read_svn_repository_info(url))
  end
  
  def self.read_svn_repository(url)
    result = `svn ls #{url}`
    raise URLNotFoundException if $?.exitstatus != 0
    result
  end

  def self.read_svn_repository_info(url)
    result = `svn info #{url}`
    raise URLNotFoundException if $?.exitstatus != 0
    result
  end

  private    
  
    # this only exists for stubbing
    def self.open_remote(uri)
      open(uri)
    end

end