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From: Mat Brown on 12 May 2010 17:24
Hi Derril,

When working with command-line options, you'll have a much better time
working with OptionParser -- it's part of the Ruby standard library:

http://ruby-doc.org/stdlib/libdoc/optparse/rdoc/classes/OptionParser.html

Mat

On Wed, May 12, 2010 at 17:16, Derril Lucci <derril.lucci(a)gmail.com> wrote:
> Greetings,
>  I am working on a project and I added command line options.  Today, I
> took the fateful step in adding the capability to do multiple options in
> the program.  For some reason, the code, which worked perfectly before
> this, now spews out the error:
>    undefined method "-" for nil:NilClass (NoMethodError)
> The code in question is:
>    dateArr[0] = DateTime.parse(ARGV[1])
> Now, this error pops up because ARGV[1] is nil.  But if I run the
> program :
>    ruby Hercules.rb -c 2010-04-15
> ARGV[1] should be 2010-04-15.  What is the problem here?
>
> Thank you,
>  dlucci
> --
> Posted via http://www.ruby-forum.com/.
>
>

From: Jesús Gabriel y Galán on 12 May 2010 17:24
On Wed, May 12, 2010 at 11:16 PM, Derril Lucci <derril.lucci(a)gmail.com> wrote:
> Greetings,
>  I am working on a project and I added command line options.  Today, I
> took the fateful step in adding the capability to do multiple options in
> the program.  For some reason, the code, which worked perfectly before
> this, now spews out the error:
>    undefined method "-" for nil:NilClass (NoMethodError)
> The code in question is:
>    dateArr[0] = DateTime.parse(ARGV[1])
> Now, this error pops up because ARGV[1] is nil.  But if I run the
> program :
>    ruby Hercules.rb -c 2010-04-15
> ARGV[1] should be 2010-04-15.  What is the problem here?


It must be something else, cause this works for me:

require 'date'

puts DateTime.parse(ARGV[1])

and calling this as

ruby test.rb -c 2010-04-15

prints the date.

Can you show the full code that errors?

Jesus.

From: Derril Lucci on 12 May 2010 17:32
Certainly.

opts is an array of Getoptlong type and holds the options and their
requirements.

opts.each do |opt, arg|
case opt
when "--date", "-d"
dateArr[0] = DateTime.parse(ARGV[1])
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