- MULTIPLE DEVELOPMENT DIRECTORIES
- SPECIAL OPTIONS
- DEBUGGING THIS MODULE
- BUGS AND LIMITATIONS
- COPYRIGHT AND LICENSE
Devel::SearchINC - Loading Perl modules from their development directories
# export PERL5OPT=-MDevel::SearchINC=/my/dev/dir # now use your new modules
When developing a new module, I always start with a standard skeleton distribution directory. The directory structure is such, however, that you have to install the module first (with
make install) before you can use it in another program or module. For example, bringing in a module like so:
requires the module to be somewhere in a path listed in
@INC, and the relative path is expected to be
h2xs creates a structure where the module ends up in
This module tries to compensate for that. The idea is that you
use() it right at the beginning of your program so it can modify
@INC to look for modules in relative paths of the special structure mentioned above, starting with directories specified along with the
use() statement (i.e. the arguments passed to this module's
This is useful because with this module you can test your programs using your newly developed modules without having to install them just so you can use them. This is especially advantageous when you consider working on many new modules at the same time.
To automatically make your development modules available to all your scripts, you can place the following in your
.bashrc (or your shell initialization file of choice):
Tilde expansion is also performed.
When this module is first run, that is, when perl first consults
@INC, all candidate files are remembered in a cache (see
build_cache()). A candidate file is one whose name ends in
.pm, is not within a directory called
_build, and is within a directory called
blib/arch. This is a long-winded way of saying that it tries to find your perl module files within standard development directories.
If a directory contains a file named
INC.SKIP, this directory will be skipped.
Note that there is a small limitation for the
PERL5OPT approach: development modules can't be loaded via
-M on the perl command line. So the following won't work:
$ export PERL5OPT=-MDevel::SearchINC=/my/dev/dir $ perl -MMy::Brand::New::Module -e'print "hello world\n"'
This is because
PERL5OPT options are processed after the actual command line options.
PERL5OPT variable is ignored when Taint checks are enabled.
import(), this subroutine builds a cache of the modules it finds. This way every time a module is
use()d, we can just look at the cache. This does mean that if you add, change or delete a module during the run-time of a script that uses
Devel::SearchINC, that script won't notice these changes. If necessary, you could re-run
MULTIPLE DEVELOPMENT DIRECTORIES
You can have multiple development directories. Just list them when using this module:
use Devel::SearchINC qw(/my/first/dir my/second/dir);
You can also use semicolons or colons instead of commas as delimiters for directories.
perlrun details the syntax for specifying multiple arguments for modules brought in with the
In addition to development directories, there are special options that can be passed to this module:
This turns on debugging; see below.
This option clears all paths that were previously set. This is useful when you have a
PERL5OPTenvironment variable but want to use this module from within your code as well and want to override the environment setting. For example:
#!/usr/bin/env perl use warnings; use strict; use Devel::SearchINC qw(-clear /path/to/other/dir); ...
DEBUGGING THIS MODULE
-debug as one of the development directories, you can turn on debugging. Note that despite the leading colon, this has nothing to do with
Exporter semantics. With debugging activated, this module will print detailed information while trying to find the requested file.
use Devel::SearchINC qw(/my/first/dir my/second/dir -debug);
-debug option can be specified anywhere in the list of development directories.
See perlmodinstall for information and options on installing Perl modules.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests through the web interface at http://rt.cpan.org/Public/Dist/Display.html?Name=Devel-SearchINC.
The latest version of this module is available from the Comprehensive Perl Archive Network (CPAN). Visit http://www.perl.com/CPAN/ to find a CPAN site near you, or see http://search.cpan.org/dist/Devel-SearchINC/.
The development version lives at http://github.com/hanekomu/Devel-SearchINC.git and may be cloned from git://github.com/hanekomu/Devel-SearchINC.git. Instead of sending patches, please fork this project using the standard git and github infrastructure.
Marcel Gruenauer <email@example.com>
COPYRIGHT AND LICENSE
This software is copyright (c) 2004 by Marcel Gruenauer.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.