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Getopt::Std

The Getopt::Std class serves as a base class for the getopts method.

Constants

VERSION

The version of the getopt library

Public Class Methods

getopts(switches) click to toggle source

Processes single character command line options with option clustering. This information is parsed from ARGV and returned as a hash, with the switch (minus the "-") as the key. The value for that key is either true/false (boolean switches) or the argument that was passed to the switch.

Characters followed by a ":" require an argument. The rest are considered boolean switches. If a switch that accepts an argument appears more than once, the value for that key becomes an array of values.

Example:

# Look for -o with argument, and -I and -D boolean arguments
opt = Getopt::Std.getopts("o:ID")

if opt["I"]
  # Do something if -I passed
end

if opt["D"]
   # Do something if -D passed
end

if opt["o"]
   case opt["o"]
      # Do something
   end
end
# File lib/getopt/std.rb, line 45
def self.getopts(switches)
   args = switches.split(/ */)
   hash = {}
   
   while !ARGV.empty? && ARGV.first =~ /^-(.)(.*)/
      first, rest = $1, $2
      pos = switches.index(first)

      # Switches on the command line must appear among the characters
      # declared in +switches+.
      raise Error, "invalid option '#{first}'" unless pos

      if args[pos+1] == ":"
         ARGV.shift
         if rest.empty?
            rest = ARGV.shift

            # Ensure that switches requiring arguments actually
            # receive a (non-switch) argument.
            if rest.nil? || rest.empty?
               raise Error, "missing argument for '-#{args[pos]}'"
            end

            # Do not permit switches that require arguments to be
            # followed immediately by another switch.
            temp_args = args.map{ |e| "-#{e}" }

            if temp_args.include?(rest) || temp_args.include?(rest[1..-1])
               err = "cannot use switch '#{rest}' as argument "
               err << "to another switch"
               raise Error, err
            end

            # For non boolean switches, arguments that appear multiple
            # times are converted to an array (or pushed onto an already
            # existant array).
            if hash.has_key?(first)
               hash[first] = [hash[first], rest].flatten
            else
               hash[first] = rest
            end
         else
            # Do not permit switches that require arguments to be
            # followed immediately by another switch.
            if args.include?(rest) || args.include?(rest[1..-1])
               err = "cannot use switch '#{rest}' as argument "
               err += "to another switch"
               raise Error, err
            end
         end
      else
         hash[first] = true # Boolean switch
         if rest.empty?
            ARGV.shift
         else
            ARGV[0] = "-#{rest}"
         end
      end
   end

   hash
end

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