C<Getopt::Simple> - Provide a simple wrapper around Getopt::Long.

NAME
SYNOPSIS
DESCRIPTION
Distributions
Constructor and initialization
The dumpOptions() function
The getOptions() function
The hash ref of command line switches
The helpOptions() function
The $$classRef{'switch'} hash reference
The $switch hash reference
WARNING re Perl bug
AUTHOR
LICENCE

NAME

Getopt::Simple - Provide a simple wrapper around Getopt::Long.

SYNOPSIS

        use Getopt::Simple;

        # Or ...
        # use Getopt::Simple qw($switch);

        my($options) =
        {
        help =>
                {
                type    => '',
                env     => '-',
                default => '',
#               verbose => '',      # Not needed on every key.
                order   => 1,
                },
        username =>
                {
                type    => '=s',    # As per Getopt::Long.
                env     => '$USER', # Help text.
                default => $ENV{'USER'} || 'RonSavage', # In case $USER is undef.
                verbose => 'Specify the username on the remote machine',
                order   => 3,       # Help text sort order.
                },
        password =>
                {
                type    => '=s',
                env     => '-',
                default => 'password',
                verbose => 'Specify the password on the remote machine',
                order   => 4,
                },
        };

        my($option) = Getopt::Simple -> new();

        if (! $option -> getOptions($options, "Usage: testSimple.pl [options]") )
        {
                exit(-1);       # Failure.
        }

        print "username: $$option{'switch'}{'username'}. \n";
        print "password: $$option{'switch'}{'password'}. \n";

        # Or, after 'use Getopt::Simple qw($switch);' ...
        # print "username: $$switch{'username'}. \n";
        # print "password: $$switch{'password'}. \n";

DESCRIPTION

Getopt::Simple is a pure Perl module.

The Getopt::Simple module provides a simple way of specifying:

Distributions

This module is available both as a Unix-style distro (*.tgz) and an ActiveState-style distro (*.ppd). The latter is shipped in a *.zip file.

See http://savage.net.au/Perl-modules.html for details.

See http://savage.net.au/Perl-modules/html/installing-a-module.html for help on unpacking and installing each type of distro.

Constructor and initialization

new(...) returns a Getopt::Simple object.

This is the class's contructor.

Usage: Getopt::Simple -> new().

This method does not take any parameters.

The `dumpOptions()` function

dumpOptions() prints all your option's keys and their current values.

dumpOptions() does not return anything.

The `getOptions()` function

The getOptions() function takes 4 parameters:

The structure of this hash ref is defined in the next section.

This parameter is mandatory.

This parameter is optional.

exit(0)

This parameter is optional.

getOptions() returns 0 for failure and 1 for success.

The hash ref of command line switches

The keys and values of this nested hash ref are as follows.

This key, value pair is mandatory.

This is the default value for this switch.

Examples:

        default => '/users/home/dir'
        default => $ENV{'REMOTEHOST'} || '127.0.0.1'

This key, value pair is mandatory.

This is help test, to indicate that the calling program can use an environment variable to set the default value of this switch.

Use '-' to indicate that no environment variable is used.

Examples:

        env => '-'
        env => '$REMOTEHOST'

Note the use of ' to indicate we want the $ to appear in the output.

This key, value pair is mandatory.

This is the type of the command line switch, as defined by Getopt::Long.

Examples:

        type => '=s'
        type => '=s@',

This key, value pair is optional.

This is long, explanatory help text which is displayed below the help containing the three columns of text: switch name, env value, default value.

Examples:

        verbose => 'Specify the username on the remote machine',
        verbose => 'Specify the home directory on the remote machine'

This key, value pair is mandatory.

This is the sort order used to force the help text to display the switches in a specific order down the page.

Examples:

        order => 1
        order => 9

The `helpOptions()` function

helpOptions() prints nicely formatted help text.

helpOptions() does not return anything.

The $$classRef{'switch'} hash reference

Command line option values are accessed in your code by dereferencing the hash reference $$classRef{'switch'}. Two examples are given above, under synopsis.

Alternately, you can use the hash reference $switch. See below.

The $switch hash reference

Command line option values are accessed in your code by dereferencing the hash reference $switch. Two examples are given above, under synopsis.

Alternately, you can use the hash reference $$classRef{'switch'}. See above.

WARNING re Perl bug

As always, be aware that these 2 lines mean the same thing, sometimes:

The problem is the spaces around the ->. Inside double quotes, ``...'', the first space stops the dereference taking place. Outside double quotes the scanner correctly associates the $self token with the {'thing'} token.

I regard this as a bug.

AUTHOR

Getopt::Simple was written by Ron Savage <ron@savage.net.au> in 1997.

LICENCE

        All Programs of mine are 'OSI Certified Open Source Software';
        you can redistribute them and/or modify them under the terms of
        The Artistic License, a copy of which is available at:
        http://www.opensource.org/licenses/index.html

C<Getopt::Simple> - Provide a simple wrapper around Getopt::Long.