From: Chris Patti <cpatti@...>
Date: 2010-11-16T07:17:19+09:00
Subject: Re: Stupid optparse question

On Mon, Nov 15, 2010 at 4:45 PM, Robert Klemme
<shortcutter@googlemail.com> wrote:
> 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
>
>

This works perfectly, thanks much!

(I never thought to mix querying ARGV with the OptionsParser class)

-Chris


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