From: Robert Klemme <shortcutter@...>
Date: 2010-11-16T06:45:18+09:00
Subject: Re: Stupid optparse question

On 11/15/2010 10:27 PM, Chris Patti wrote:
> How can I make my code print the usage even if zero options are given?
>   I had *thought* opts.on_tail would do this, but it doesn't seem to be
> working.  The usage prints properly if I use -h though:
> ---
> require 'optparse'
>
> options = {}

o = OptionParser.new do |opts|

>    opts.banner = "Usage: #$0 [options] [terms]"
>
>    opts.on("-a", "--automatic", "Use current Git repo to determine
> current and next release branch and tag names") do |a|
>      options[:automatic] = a
>    end
>
>    opts.on("-n", "--next-branch [nextbranch]", "The branch you want
> this script to create.") do |n|
>      options[:nextbranch] = n
>    end
>
>    opts.on("-t", "--tag [tag]", "The tag you want the new branch
> created from.") do |t|
>      options[:tag] = t
>    end
>
>    opts.on_tail("-h", "--help", "Show this help message.") do
>       puts opts
>       exit
>    end
>
> end

o.parse!

if ARGV.empty?
   puts o
else
   # do whatever
end

Kind regards

	robert