From: ara.t.howard@...
Date: 2006-05-16T23:06:39+09:00
Subject: Re: GetoptLong Accessing the values with out looping

On Tue, 16 May 2006, Paul D. Kraus wrote:

> Simple question but for the life of me I can't figure it out.
> I am converting some of my basic perl scripts that I use daily as an
> excersice in learning ruby.
>
> I need to grab a date from the command line that will eventually be
> converted into a filename.
>
> no I want to call my script like such ...
> ./myscript.rb -d 2006-08-06
>
> I then want to validate what is being set in -d.
> Here is the code I have that works but it just seems excessive to have to
> loop through the options...
>
> def getopts
> opts = GetoptLong.new([ '-d', '--date', GetoptLong::REQUIRED_ARGUMENT])
> opts.each do |opt,arg|
>   if opt =~ /-d|--date/ && arg =~ /(\d{4})-(\d{2})-(\d{2})/
>       date = arg.gsub('-','')
>       return date
>   else
>     puts "Date needs to be set to YYYY-MM-DD using -d or --date"
>     exit
>   end
> end
> end
>
> I thought I would just be able to do...
> if opt['-d'] =~ <rxhere> || opt['--date'] =~ <rxhere>
> <code here>
> end

it's not that bad is it?

     harp:~ > cat a.rb
     require 'getoptlong'
     require 'time'

     def getdate
       gl = GetoptLong.new ['-d', '--date', GetoptLong::REQUIRED_ARGUMENT]
       opts = {} and gl.each{|k,v| opts[k.delete('-')] = v}

       if((date = opts['d']))
         raise 'date needs to be set to YYYY-MM-DD using -d or --date' unless
           date =~ %r/^ \d{4} - \d{2} - \d{2} $/iox
         return Time.parse(date)
       end
     end

     p getdate


     harp:~ > ruby a.rb --date=2006-05-01
     Mon May 01 00:00:00 MDT 2006



regards.

-a
-- 
be kind whenever possible... it is always possible.
- h.h. the 14th dali lama