NAME Devel::SearchINC - Loading Perl modules from their development directories VERSION version 2.103460 SYNOPSIS # export PERL5OPT=-MDevel::SearchINC=/my/dev/dir # now use your new modules DESCRIPTION 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: use My::Module; requires the module to be somewhere in a path listed in @INC, and the relative path is expected to be "My/Module.pm". However, "h2xs" creates a structure where the module ends up in "My/Module/Module.pm". 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 "import()"). 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): export PERL5OPT=-MDevel::SearchINC=/my/dev/dir 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 "t", "CVS", ".svn", ".git", "skel" or "_build", and is within a directory called "lib", "blib/lib" or "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. Also, the "PERL5OPT" variable is ignored when Taint checks are enabled. FUNCTIONS build_cache Called during "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 "build_cache()". 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); or perl -MDevel::SearchINC=/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 "-M" switch. SPECIAL OPTIONS In addition to development directories, there are special options that can be passed to this module: "-debug" This turns on debugging; see below. "-clear" This option clears all paths that were previously set. This is useful when you have a "PERL5OPT" environment variable but want to use this module from within your code as well and want to override the environment setting. For example: export PERL5OPT=-MDevel::SearchINC=/path/to/dev then: #!/usr/bin/env perl use warnings; use strict; use Devel::SearchINC qw(-clear /path/to/other/dir); ... DEBUGGING THIS MODULE By using "-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. For example use Devel::SearchINC qw(/my/first/dir my/second/dir -debug); or perl -MDevel::SearchINC=/my/first/dir,-debug,/my/second/dir The "-debug" option can be specified anywhere in the list of development directories. INSTALLATION 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 . AVAILABILITY The latest version of this module is available from the Comprehensive Perl Archive Network (CPAN). Visit to find a CPAN site near you, or see . The development version lives at and may be cloned from . Instead of sending patches, please fork this project using the standard git and github infrastructure. AUTHOR Marcel Gruenauer 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.