| Getopt::Usaginator(3pm) | User Contributed Perl Documentation | Getopt::Usaginator(3pm) |
Getopt::Usaginator - Conjure up a usage function for your applications
version 0.0012
use Getopt::Usaginator <<_END_;
Usage: xyzzy <options>
--derp Derp derp derp
--durp Durp durp durp
-h, --help This usage
_END_
# The 'usage' subroutine is now installed
...
$options = parse_options( @ARGV ); # Not supplied by Usaginator
usage if $options{help}; # Print usage and exit with status 0
if ( ! $options{derp} ) {
# Print warning and usage and exit with status -1
usage "You should really derp";
}
if ( $options{durp} ) {
# Print warning and usage and exit with status 2
usage 2 => "--durp is not ready yet";
}
...
usage 3 # Print usage and exit with status 3
Getopt::Usaginator is a tool for creating a handy usage subroutine for commandline applications
It does not do any option parsing, but is best paired with Getopt::Long or any of the other myriad of option parsers
Install a "usage" subroutine configured with the <usage> text
Return a subroutine configured with the <usage> text
More advanced usage is possible, peek under the hood for more information
perldoc -m Getopt::Usaginator
An example:
use Getopt::Usaginator
# Called with the error
error => sub { ... },
# Called when usage printing is needed
usage => sub { ... },
...
;
use Getopt::Usaginator ...
sub run {
my $self = shift;
my @arguments = @_;
usage 0 unless @arguments;
my ( $help );
{
local @ARGV = @arguments;
GetOptions(
'help|h|?' => \$help,
);
}
usage 0 if $help;
...
}
Robert Krimen <robertkrimen@gmail.com>
This software is copyright (c) 2010 by Robert Krimen.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
| 2022-11-19 | perl v5.36.0 |