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Filename : shellquote.rb
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# Copyright (C) 2009 Thomas Bellman
#
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# permit persons to whom the Software is furnished to do so, subject to
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# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
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# OTHER DEALINGS IN THE SOFTWARE.
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# from Thomas Bellman.

Puppet::Parser::Functions.newfunction(:shellquote, :type => :rvalue, :arity => -1, :doc => "\
    Quote and concatenate arguments for use in Bourne shell.

    Each argument is quoted separately, and then all are concatenated
    with spaces.  If an argument is an array, the elements of that
    array is interpolated within the rest of the arguments; this makes
    it possible to have an array of arguments and pass that array to
    shellquote instead of having to specify each argument
    individually in the call.
    ") \
do |args|
  safe = 'a-zA-Z0-9@%_+=:,./-'    # Safe unquoted
  dangerous = '!"`$\\'            # Unsafe inside double quotes

  result = []
  args.flatten.each do |word|
    if word.length != 0 and word.count(safe) == word.length
      result << word
    elsif word.count(dangerous) == 0
      result << ('"' + word + '"')
    elsif word.count("'") == 0
      result << ("'" + word + "'")
    else
      r = '"'
      word.each_byte do |c|
        r += "\\" if dangerous.include?(c.chr)
        r += c.chr
      end
      r += '"'
      result << r
    end
  end

  return result.join(" ")
end