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comp.lang.ruby

GetoptLong, but not on ARGV

Trans

6/20/2007 5:41:00 PM

Is there a way to utilize Getoptlong on an arbitrary command var, ie.
not on ARGV. I figure I can alway do something like:

require 'getoptlong'

my_argv = Shellwords.shellwords( "foo -x" )

const_set(:ARGV, my_argv)

opts = GetoptLong.new(
[ '-x', GetoptLong::NO_ARGUMENT ]
)

But it just doesn't seem proper to reset ARGV.

Thanks,
T.
6 Answers

Trans

6/20/2007 10:12:00 PM

0



On Jun 20, 4:18 pm, "Robert Dober" <robert.do...@gmail.com> wrote:
> On 6/20/07, Trans <transf...@gmail.com> wrote:
>
>
>
> > Is there a way to utilize Getoptlong on an arbitrary command var, ie.
> > not on ARGV. I figure I can alway do something like:
>
> > require 'getoptlong'
>
> > my_argv = Shellwords.shellwords( "foo -x" )
>
> > const_set(:ARGV, my_argv)
>
> > opts = GetoptLong.new(
> > [ '-x', GetoptLong::NO_ARGUMENT ]
> > )
>
> > But it just doesn't seem proper to reset ARGV.
>
> > Thanks,
> > T.
>
> Basically did
> %s/ARGV/(@arglist||ARGV)/g
> and inserted the attribute accessor, funny thing seems to work ;)
>
> opts = GetoptLong.new(
> [ '-x', GetoptLong::NO_ARGUMENT ]
> )
> opts.arglist = Shellwords.shellwords( "foo -x" )

Ah, so we need a patch. Okay well I guess I'll post that up on the
board too.

Thanks Robert,
T.

Nobuyoshi Nakada

6/21/2007 10:29:00 AM

0

Hi,

At Thu, 21 Jun 2007 17:04:15 +0900,
Robert Dober wrote in [ruby-talk:256352]:
> It does *not* temper with internal state, just allows an array to be
> passed to #each or #get. I tested it with this use case:

You forget about #terminate.

--
Nobu Nakada

Trans

6/21/2007 2:51:00 PM

0



On Jun 21, 4:04 am, "Robert Dober" <robert.do...@gmail.com> wrote:
> On 6/21/07, Trans <transf...@gmail.com> wrote:
>
> > Ah, so we need a patch. Okay well I guess I'll post that up on the
> > board too.
>
> Yes definitely ARGV is hardcoded, I was however fooling around, trying
> to make a patch in less than a minute, which worked ;).
>
> If you really want to send up a patch, please consider this one (it is
> a correct patch created with diff -u this time too):
>
> It does *not* temper with internal state, just allows an array to be
> passed to #each or #get. I tested it with this use case:
>
> ------------------ 8< -------------------------
> require 'getoptlong'
>
> opt = GetoptLong.new([ '-x', GetoptLong::NO_ARGUMENT ],[ '-b',
> GetoptLong::REQUIRED_ARGUMENT])
>
> blk = lambda do
> |*v|
> puts v.join(": ")
> end
> opt.dup.each %w{ -x -b 1024}, &blk
>
> opt.dup.each %w{ -b 4096 }, &blk
> ------------------------------ 8<---------------------------
>
> Please note the necessity of dup for reuse, I did not want to bother
> with internal state of a class I do not understand and I have no time
> to dig into :(.
>
> Cheers
> Robert

I think i would be better to do:

def argslist
@argslist ||= ARGV # or ARGV.dup
end

def argslist=(array)
@argslist = array.to_ary
end

and then /argslist/ARGV/g

T.

Robert Dober

6/21/2007 4:00:00 PM

0

>
> I think i would be better to do:
>
> def argslist
> @argslist ||= ARGV # or ARGV.dup
> end
>
> def argslist=(array)
> @argslist = array.to_ary
> end
>
> and then /argslist/ARGV/g

Hmm more in the spirit of the original class probably.
Anyway if Nobu really wants this little patch I can adapt the patch to
your approach if he prefers.

Robert

--
You see things; and you say Why?
But I dream things that never were; and I say Why not?
-- George Bernard Shaw

Nobuyoshi Nakada

6/21/2007 8:29:00 PM

0

Hi,

At Thu, 21 Jun 2007 19:45:08 +0900,
Robert Dober wrote in [ruby-talk:256371]:
> Thanks nobu, does this fix it?

Almost, but #terminate can be called outside #get. I think
getoptlong isn't designed for such usage.

> @non_option_arguments.reverse_each do |argument|
> - ARGV.unshift(argument)
> + args.unshift(argument)
> end

In short, this can be:

args.unshift(*@non_option_arguments)

--
Nobu Nakada

Robert Dober

6/21/2007 10:03:00 PM

0

On 6/21/07, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
> Hi,
>
> At Thu, 21 Jun 2007 19:45:08 +0900,
> Robert Dober wrote in [ruby-talk:256371]:
> > Thanks nobu, does this fix it?
>
> Almost, but #terminate can be called outside #get. I think
> getoptlong isn't designed for such usage.
>
> > @non_option_arguments.reverse_each do |argument|
> > - ARGV.unshift(argument)
> > + args.unshift(argument)
> > end
>
> In short, this can be:
>
> args.unshift(*@non_option_arguments)
I did not want to lecture ;)
Hmm I am a little bit confused now because I have provided #terminate
with a defaulted parameter for exactly the reason above.
Anyway I think Tom's idea to use an instance variable @args (defaulting to ARGV)
with an attribute accessor reflects the spirit of the original design
much better.
I will try to find half an hour to do that for fun this weekend and I
will send it, feel free to use it or to loose it ;).

Cheers
Robert
>
> --
> Nobu Nakada
>
>


--
You see things; and you say Why?
But I dream things that never were; and I say Why not?
-- George Bernard Shaw