stdlib_libraries/option_parser_orders.rb

tests/_examples/stdlib_libraries/option_parser_orders.rb in the metorex repository.

# OptionParser reads options in order, handing each argument that is not an
# option to the block or stopping at it, or permuted, collecting them. A short
# option's value may follow it or be written attached, and short flags may be
# written together.
require("optparse")

parser = OptionParser.new
parser.on("-p") { |value| p([:p, value]) }
parser.on("-m ") { |value| p([:m, value]) }
parser.on("-n VALUE") { |value| p([:n, value]) }
parser.on("-r") { |value| p([:r, value]) }
parser.on("--port=PORT") { |value| p([:port, value]) }
parser.on("--[no-]color") { |value| p([:color, value]) }

seen = []
words = ["-p", "x", "-m", "644", "-n5", "-pr", "-rn", "7", "--port", "80", "--port=81", "--no-color", "y"]
parser.order!(words) { |word| seen << word }
p(seen, words)
p(parser.order!(["-p", "x", "-p"]))
p(parser.permute!(["x", "-p", "y", "--", "-m", "z"]))
p(parser.parse(["a", "-p", "b"]))
kept = ["-p", "--", "-m"]
handed = []
parser.order!(kept) { |word| handed << word }
p(handed, kept)
[["-z"], ["-n"], ["--nope"]].each do |words_given|
  parser.order!(words_given)
rescue OptionParser::ParseError => error
  p([error.class, error.message])
end

Output:

[:p, true]
[:m, "644"]
[:n, "5"]
[:p, true]
[:r, true]
[:r, true]
[:n, "7"]
[:port, "80"]
[:port, "81"]
[:color, false]
["x", "y"]
[]
[:p, true]
["x", "-p"]
[:p, true]
["x", "y", "-m", "z"]
[:p, true]
["a", "b"]
[:p, true]
[]
["-m"]
[OptionParser::InvalidOption, "invalid option: -z"]
[OptionParser::MissingArgument, "missing argument: -n"]
[OptionParser::InvalidOption, "invalid option: --nope"]