/ 
Getopt-CommandLineExports-0.02
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/ Getopt::CommandLineExports

NAME

Getopt::CommandLineExports - Allow suroutines within a script to export comand line options with bash auto completion

VERSION

Version 0.02

SYNOPSIS

Example Code:

use strict;
use warnings;
use Getopt::CommandLineExports qw(&regAC &parseArgsByPosition &parseArgs
    &checkArgs $scriptName @exportedSubs %cmdLines);

$scriptName = qq[TestCommandLineExports];
%cmdLines = (
    twoScalars          => [qw/ ONE=s TWO=s /],
    oneHash         => [qw/ ONE=s% /],
    oneList         => [qw/ ONE=s@ /],
);
sub twoScalars
{
    my %h = (
        ONE => undef,
        TWO => undef,
        ( parseArgs \@_, @{$cmdLines{twoScalars}}),
    );
    print "twoScalars missing required argument:\n"
        . join( "\n", checkArgs \%h ) . "\n"
        if ( checkArgs \%h );
    return " $h{ONE} , $h{TWO} \n";
}

sub oneHash
{
    my %h = (
        ONE => undef,
        ( parseArgs \@_, @{$cmdLines{oneHash}}),
    );
    print "oneHash missing required argument:\n"
        . join( "\n", checkArgs \%h ) . "\n"
        if ( checkArgs \%h );
    print "oneHash\n";
    print join("\n", (%{$h{ONE}}));
}

sub oneList
{
    my %h = (
        ONE => undef,
        ( parseArgs \@_, @{$cmdLines{oneList}}),
    );
    print "oneList missing required argument:\n"
        . join( "\n", checkArgs \%h ) . "\n"
        if ( checkArgs \%h );
    print "oneList\n";
    print join("\n",@{$h{ONE}});
}

# The "Main" subroutine. Not included in package, must be added manually to a script

if ( defined $ARGV[0] )
{
    if ( defined( &{ $ARGV[0] } ) )
    {
        no strict 'refs';
        my $subRef = shift @ARGV;
        print join( "\n", &$subRef(@ARGV) ) . "\n" unless $subRef =~ /regAC/ ;
        &$subRef($scriptName, \@exportedSubs, \%cmdLines) if $subRef =~ /regAC/ ;
        exit 0;
    }
}

# some unit test examples:
twoScalars "Hello1", "Hello2";
twoScalars {ONE => "Hello1", TWO => "Hello2"};
twoScalars "--ONE Hello1 --TWO Hello2";
twoScalars "--ONE", "Hello1", "--TWO", "Hello2";
twoScalars "--ONE", "Hello1", "--TWO", "Hello2", "--THREE", "Hello3"; # complains about "unknown option: three"

PURPOSE

This module is intended to provide the capability to have a single script export many subcommands in a consistant manner.

In the example above, the script is named "TestCommandLineExports". On a bash style command line, the following commands would work:

TestCommandLineExports twoScalars --ONE "Arg1" --TWO "Arg2"

and would print:

Arg1, Arg2

while

TestCommandLineExports twoScalars --TWO "Arg2"

would print:

twoScalars missing required argument:
--ONE

TestCommandLineExports twoScalars may also be called through a CGI interface as well.

The principle use of this was to provide an easy, consistant, method to provide unit test ability for scripts. It also allows for a single script to export multiple subcommands and, with the included bash auto completion function, allows for the subcommands and options to integrate nicely with the bash shell.

EXPORT

A list of functions that can be exported. You can delete this section if you don't export anything, such as for a purely object-oriented module.

SUBROUTINES/METHODS

regAC

Print a bash auto completion script. Returns a script roughly sutiable for the bash_autocompletion functions:

Include roughly the following in your script:

# this hash uses perl's Getopt::Long format 
my %cmdLines = (
    regAC => [qw//],
    SubCommandOne => [qw/DIRECTORY=s YES_OR_NO=s ANY_FILE=s/],
    SubCommandTwo => {qw/INT=i/],
)
my @exportedSubs = keys %cmdLines;

#you can use bash completion words here ("__directory__") to complete with directories
# The default is filename completion
my %additionalWordCompletions = (
    SubCommandOne => {
        DIRECTORY => [qw/__directory__/],
        YES_OR_NO => [qw/yes no/],
    },
);

if ( defined $ARGV[0] )
{
    if ( defined( &{ $ARGV[0] } ) )
    {
        no strict 'refs';
        my $subRef = shift @ARGV;
        print join( "\n", &$subRef(@ARGV) ) . "\n" unless $subRef =~ /regAC/ ;
        &$subRef($scriptName, \@exportedSubs, \%cmdLines, \%additionalWordCompletions) if $subRef =~ /regAC/ ;
        exit 0;
    }
}

Run from the commandline as:

ScriptName regAC > /etc/bash_completion.d/ScriptName
source /etc/bash_completion.d/ScriptName

or

sudo ScriptName regAC
source /etc/bash_completion.d/ScriptName

and the script should be registered with all the commands in:

@Getopt::CommandLineExports::exportedSubs

and the command lines from:

%Getopt::CommandLineExports::cmdLines

parseArgs

parse and argument list according to a command line spec in the Getopt::Long format. Returns a hash of arguments and values.

%cmdLines = (
    function   => [qw/ REQUIRED_ARGUMENT=s OPTIONAL_ARGUMENT_ONE=s OPTIONAL_ARGUMENT_TWO=s  /],
);

my %h = (
    REQUIRED_ARGUMENT     => undef, # undef means the argument is required
    OPTIONAL_ARGUMENT_TWO => 'default value',  # a default value is provided
    # no mention of OPTIONAL_ARGUMENT_ONE means that it could be provided or could be undefined
    # checkArgs below will NOT include this in the missing argument list
    (   parseArgs \@_, @{$cmdLines{function}})
);

parseArgsByPosition

parse an argument list according to a command line spec in the Getopt::Long format.

parseArgsByPosition( \@argv, \%args, @ComSpec);

The first argument is the standard argv list. The second is a reference to a hash to receive the arguments parsed from argv (a reference is passed to allow for default values to be set. The last argument is a reference to the argument spec in Getopt::Long format

as an example:

my %args = (ARG1 => "Default Value", ARG2 => undef);

parseArgsByPosition( ["One", "Two", "Three"], \%args, qw/ARG1=s ARG2=s ARG3=s ARG4=s/);

should set %args to be (ARG1 => "One", ARG2 => "Two", ARG3 => "Three")

checkArgs

checkArgs will return a list of arguments that are undefined. This can be used to identify required arguments with:

my %h = (
    REQUIRED_ARGUMENT     => undef,
    (   parseArgs \@_, @{$cmdLines{function}})
);
print "function missing required argument:\n"
    . join( "\n", checkArgs \%h ) . "\n"
    if ( checkArgs \%h );

AUTHOR

Robert Haxton, <robert.haxton at gmail.com>

BUGS

Please report any bugs or feature requests to bug-getopt-commandlineexports at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Getopt-CommandLineExports. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc Getopt::CommandLineExports

You can also look for information at:

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

Copyright 2008-2012 Robert Haxton.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.