53 lines
1.3 KiB
Ruby
53 lines
1.3 KiB
Ruby
#
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# prefix.rb
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#
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module Puppet::Parser::Functions
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newfunction(:prefix, :type => :rvalue, :doc => <<-EOS
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This function applies a prefix to all elements in an array or a hash.
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*Examples:*
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prefix(['a','b','c'], 'p')
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Will return: ['pa','pb','pc']
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EOS
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) do |arguments|
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# Technically we support two arguments but only first is mandatory ...
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raise(Puppet::ParseError, "prefix(): Wrong number of arguments " +
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"given (#{arguments.size} for 1)") if arguments.size < 1
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enumerable = arguments[0]
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unless enumerable.is_a?(Array) or enumerable.is_a?(Hash)
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raise Puppet::ParseError, "prefix(): expected first argument to be an Array or a Hash, got #{enumerable.inspect}"
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end
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prefix = arguments[1] if arguments[1]
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if prefix
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unless prefix.is_a?(String)
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raise Puppet::ParseError, "prefix(): expected second argument to be a String, got #{prefix.inspect}"
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end
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end
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if enumerable.is_a?(Array)
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# Turn everything into string same as join would do ...
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result = enumerable.collect do |i|
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i = i.to_s
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prefix ? prefix + i : i
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end
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else
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result = Hash[enumerable.map do |k,v|
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k = k.to_s
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[ prefix ? prefix + k : k, v ]
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end]
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end
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return result
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end
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end
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# vim: set ts=2 sw=2 et :
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