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Often there are several possible providers of some functionality your program needs, but you don't know which is available at the run site. For example, one of the modules may be implemented with XS, or not in the core Perl distribution and thus not necessarily installed. Best.pm attempts to load modules from a list, stopping at the first successful load and failing only if no alternative was found.

The GNU Autoconf Archive is a collection of more than 450 macros for GNU Autoconf that have been contributed as free software by friendly supporters of the cause from all over the Internet. Every single one of those macros can be re-used without imposing any restrictions whatsoever on the licensing of the generated configure script. In particular, it is possible to use all those macros in configure scripts that are meant for non-free software.

This module provides an API for loading and saving of simple configuration file records. Entries in the configuration file are essentially key,value pairs, with the key and values separated by a single equals symbol. The key consists only of alphanumeric characters. There are three types of values, scalar values can contain anything except newlines. Trailing whitespace will be trimmed unless the value is surrounded in double quotes.

From Date::Simple(3) man page: Dates are complex enough without times and timezones. This module may be used to create simple date objects. It handles: Validation: Reject 1999-02-29 but accept 2000-02-29. Interval arithmetic: How many days were between two given dates? What date comes N days after today? Day-of-week calculation: What day of the week is a given date? It does NOT deal with hours, minutes, seconds, and time zones.

The DateTime::Event::Easter module returns Easter events for DateTime objects. From a given datetime, it can tell you the previous, the following and the closest Easter event. The 'is' method will tell you if the given DateTime is an Easter Event. Easter Events can be Palm Sunday, Maundy Thursday, Good Friday, Black Saturday and Easter Sunday. If that's not enough, the module will also accept an offset so you can get the date for Pentecost (49 days after Easter Sunday) by passing 49.

This module optimizes Moo type checks when used with Type::Tiny to perform better. It will automatically apply to isa checks and coercions that use Type::Tiny. Non-Type::Tiny isa checks will work as normal. This is done by inlining the type check in a more optimal manner that is specific to Type::Tiny rather than the general mechanism Moo usually uses. With this module, setters with type checks should be as fast as an equivalent check in Moose.

The most of the code of this module is taken from the PAUSE code as of April 2013 almost verbatim. Thus, the heart of this module should be quite stable. However, I made it not to use pipe ("-|") as well as I stripped database-related code. If you encounter any issue, that's most probably because of my modification. This module doesn't provide features to extract a distribution or parse meta files intentionally.

This module has two main goals: to make it easy to create correct sort functions, and to make it simple to select the optimum sorting algorithm for the number of items to be sorted. Sort::Maker generates complete sort subroutines in one of four styles, plain, orcish manouver, Schwartzian Transform and the Guttman-Rosler Transform. You can also get the source for a sort sub you create via the sorter_source call.

This module provides one function, delete_sub, that deletes the subroutine whose name is passed to it. (To load the module without importing the function, write use Sub::Delete();.) This does more than simply undefine the subroutine in the manner of undef &foo, which leaves a stub that can trigger AUTOLOAD (and, consequently, won't work for deleting methods). The subroutine is completely obliterated from the symbol table (though there may be references to it elsewhere, including in compiled code).

Taint is a good thing. However, few people use taint even though they should. The goal of this module isn't to use taint less, but to actually encourage its use more. This module aims to make using taint as painless as possible (This can be an argument against it - often implementation of security implies pain - so taking away pain might lessen security - sort of).