Tooling for creating usage specs from OptionParser definitions.

Add gem "option_parser_usage" to your gemfile and then bundle install.

Example:

require 'optparse'
require 'option_parser_usage'

myparser = OptionParser.new do |p|
  p.program_name = "myprog"
  p.version =  "1.2.3"
  p.banner = "my test program"

  p.on("--foo", "enables foo")
  p.on("--bar BAR", "requires argument BAR")
  p.on("--baz [BAZ]", "optional argument BAZ")
end

puts OptionParserUsage.usage_for_parser(myparser)

# Alternatively
OptionParserUsage.monkeypatch!
puts myparser.to_usage_spec

This will print (twice)

bin myprog
version "1.2.3"
about "my test program"
flag --foo {
    help "enables foo"
}
flag --bar {
    arg <BAR> required=#true
    help "requires argument BAR"
}
flag --baz {
    arg "[BAZ]" required=#false
    help "optional argument BAZ"
}

OptionParserUsage.monkeypatch!
# undo with OptionParserUsage.unmonkeypatch!

This monkeypatch adds #to_usage_spec to OptionParser instances.

OptionParserUsage.document_officious_help!
# undo with OptionParserUsage.undocument_officious_help!

This monkeypatch changes the default -h/--help switch internal to the OptionParser to be documented so it can be exposed in docs

Both monkeypatches alter global state with all the requisite warnings about doing that.

OptionParser supports a style of flag that cannot be properly rendered in usage as far as I can tell. --foo=[FOO] will enable either --foo or --foo=val but not --foo val (val will be left as a positional argument). Generating a usage spec will raise an error if one of these is encountered.

Positional arguments and generally anything parsed outside of the OptionParser will not be represented in the generated config.

bundle install for the dev dependencies

bundle exec rspec to run the tests

bundle exec standardrb --fix to lint and autocorrect

Bug reports and pull requests are welcome on GitHub at https://github.com/packrat386/option_parser_usage.