puppetlabs-stdlib/lib/puppet/parser/functions/dirname.rb

module Puppet::Parser::Functions
  newfunction(:dirname, :type => :rvalue, :doc => <<-EOS
    Returns the dirname of a path.
    EOS
  ) do |arguments|

    if arguments.size < 1 then
      raise(Puppet::ParseError, "dirname(): No arguments given")
    end
    if arguments.size > 1 then
      raise(Puppet::ParseError, "dirname(): Too many arguments given (#{arguments.size})")
    end
    unless arguments[0].is_a?(String)
      raise(Puppet::ParseError, 'dirname(): Requires string as argument')
    end

    return File.dirname(arguments[0])
  end
end

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