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package X11::Muralis::Backend; |
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use strict; |
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use warnings; |
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=head1 NAME |
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X11::Muralis::Backend - display backend for X11::Muralis |
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=head1 VERSION |
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This describes version B<0.1001> of X11::Muralis::Backend. |
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=cut |
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our $VERSION = '0.1001'; |
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=head1 SYNOPSIS |
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muralis --use I |
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=head1 DESCRIPTION |
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This is the base class for backend modules for X11::Muralis. |
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Generally speaking, the only methods that backends need to override |
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are "new" and "display". |
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=cut |
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use File::Spec; |
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=head1 METHODS |
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=head2 new |
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There are two parameters that need to be set in "new"; |
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=over |
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=item prog |
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The name of the program which is used as the backend. |
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=item can_do |
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A hash containing the features that the backend provides. |
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=back |
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=cut |
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sub new { |
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my $class = shift; |
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my %parameters = @_; |
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my $self = bless ({%parameters}, ref ($class) || $class); |
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return ($self); |
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} # new |
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=head2 name |
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The name of the backend; this is basically the last component |
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of the module name. This works as either a class function or a method. |
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$name = $self->name(); |
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$name = X11::Muralis::Backend::name($class); |
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=cut |
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sub name { |
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my $class = shift; |
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my $fullname = (ref ($class) ? ref ($class) : $class); |
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my @bits = split('::', $fullname); |
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return pop @bits; |
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} # name |
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=head2 active |
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Returns true if the backend program is available to run. |
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This is checked by searching the PATH environment variable and checking |
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for the existence of $self->{prog} |
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=cut |
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sub active { |
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my $self = shift; |
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my @path = split(':', $ENV{PATH}); |
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my $found = 0; |
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foreach my $dir (@path) |
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{ |
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my $file = File::Spec->catfile($dir, $self->{prog}); |
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if (-f $file) |
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{ |
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$found = 1; |
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last; |
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} |
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} |
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return $found; |
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} # active |
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=head2 provides |
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Returns a hash of the features the backend has enabled. |
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=cut |
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sub provides { |
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my $self = shift; |
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my %prov = (); |
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if (defined $self->{can_do}) |
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{ |
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%prov = %{$self->{can_do}}; |
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} |
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return %prov; |
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} # provides |
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=head2 display |
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Display the file, with the given options. |
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THis must be overridden by the specific backend class. |
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=cut |
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sub display { |
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my $self = shift; |
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return 0; |
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} # display |
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=head1 REQUIRES |
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File::Spec |
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=head1 INSTALLATION |
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To install this module, run the following commands: |
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perl Build.PL |
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./Build |
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./Build test |
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./Build install |
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Or, if you're on a platform (like DOS or Windows) that doesn't like the |
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"./" notation, you can do this: |
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perl Build.PL |
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perl Build |
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perl Build test |
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perl Build install |
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In order to install somewhere other than the default, such as |
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in a directory under your home directory, like "/home/fred/perl" |
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go |
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perl Build.PL --install_base /home/fred/perl |
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as the first step instead. |
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This will install the files underneath /home/fred/perl. |
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You will then need to make sure that you alter the PERL5LIB variable to |
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find the modules, and the PATH variable to find the script. |
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Therefore you will need to change: |
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your path, to include /home/fred/perl/script (where the script will be) |
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PATH=/home/fred/perl/script:${PATH} |
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the PERL5LIB variable to add /home/fred/perl/lib |
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PERL5LIB=/home/fred/perl/lib:${PERL5LIB} |
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=head1 SEE ALSO |
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perl(1). |
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=head1 BUGS |
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Please report any bugs or feature requests to the author. |
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=head1 AUTHOR |
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Kathryn Andersen RUBYKAT |
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perlkat AT katspace DOT org |
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www.katspace.org |
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=head1 COPYRIGHT AND LICENCE |
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192
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Copyright (c) 2008 by Kathryn Andersen |
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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=cut |
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1; # End of X11::Muralis::Backend |
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__END__ |