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Re: Range in Getopt

by james2vegas (Chaplain)
on Oct 03, 2012 at 06:16 UTC ( #996986=note: print w/replies, xml ) Need Help??


in reply to Range in Getopt

You can evaluate options with Getopt::Long using a custom subroutine, like this:

use Getopt::Long; my $_debug; GetOptions('d=i' => sub { $_debug = $_[1]; ($_debug > 0 && $_debug <= 4) or die "Invalid Debug Level ($_d +ebug)" } ) and warn $_debug;


GetOptions catches the die and throws it as a warning and returns false. When using the custom subroutine, you need to handle assigning to the variable for your option yourself.

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Re^2: Range in Getopt
by roho (Abbot) on Oct 03, 2012 at 13:26 UTC
    I like your solution, but when no -d parameter is present, the following warning is displayed:

    Warning: something's wrong at C:\tmp\getopt-range.pl line 15.

    This appears to be a warning from Getopt::Long. I tried adding return 1 if !defined @_; at the top of the sub but the warning persists.

    "Its not how hard you work, its how much you get done."

      That is because while the d option's value is required, the d option itself is not, check the definedness of $_debug afterwards:

      use Getopt::Long; my $_debug; GetOptions('d=i' => sub { $_debug = $_[1]; ($_debug > 0 && $_debug <= 4) or die "Invalid Debug Level ($_d +ebug)" } ) or exit 1; die "Debug Level is required" unless defined $_debug; warn "Debug Level is $_debug\n";

      or set a default value before GetOptions:

      use Getopt::Long; my $_debug = 0; GetOptions('d=i' => sub { $_debug = $_[1]; ($_debug > 0 && $_debug <= 4) or die "Invalid Debug Level ($_d +ebug)" } ) or exit 1; warn "Debug Level is $_debug\n";

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