#
# bool2str.rb
#

module Puppet::Parser::Functions
  newfunction(:bool2str, :type => :rvalue, :doc => <<-EOS
    Converts a boolean to a string using optionally supplied arguments. The
    optional second and third arguments represent what true and false will be
    converted to respectively. If only one argument is given, it will be
    converted from a boolean to a string containing 'true' or 'false'.

    *Examples:*

    bool2str(true)                    => 'true'
    bool2str(true, 'yes', 'no')       => 'yes'
    bool2str(false, 't', 'f')         => 'f'

    Requires a single boolean as an input.
    EOS
  ) do |arguments|

    unless arguments.size == 1 or arguments.size == 3
      raise(Puppet::ParseError, "bool2str(): Wrong number of arguments " +
                                "given (#{arguments.size} for 3)")
    end

    value = arguments[0]
    true_string = arguments[1] || 'true'
    false_string = arguments[2] || 'false'
    klass = value.class

    # We can have either true or false, and nothing else
    unless [FalseClass, TrueClass].include?(klass)
      raise(Puppet::ParseError, 'bool2str(): Requires a boolean to work with')
    end

    unless [true_string, false_string].all?{|x| x.kind_of?(String)}
      raise(Puppet::ParseError, "bool2str(): Requires strings to convert to" )
    end

    return value ? true_string : false_string
  end
end

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