Path::Iterator::Rule iterates over files and directories to identify ones matching a user-defined set of rules. The API is based heavily on File::Find::Rule, but with more explicit distinction between matching rules and options that influence how directories are searched. A Path::Iterator::Rule object is a collection of rules (match criteria) with methods to add additional criteria. Options that control directory traversal are given as arguments to the method that generates an iterator.

A summary of features for comparison to other file finding modules:

• provides many helper methods for specifying rules

• offers (lazy) iterator and flattened list interfaces

• custom rules implemented with callbacks

• breadth-first (default) or pre- or post-order depth-first searching

• follows symlinks (by default, but can be disabled)

• directories visited only once (no infinite loop; can be disabled)

• doesn't chdir during operation

• provides an API for extensions

As a convenience, the PIR module is an empty subclass of this one that is less arduous to type for one-liners.

Devel::StackTrace::AsHTML adds as_html method to Devel::StackTrace which displays the stack trace in beautiful HTML, with code snippet context and function parameters. If you call it on an instance of Devel::StackTrace::WithLexicals, you even get to see the lexical variables of each stack frame.

Sys::Syscall allows one to use epoll and sendfile system calls from Perl. Support is mostly Linux-only for now, but other syscalls/OSes are planned for the future.

B::Keywords supplies several arrays of exportable keywords: @Scalars, @Arrays, @Hashes, @Filehandles, @Symbols, @Functions, @Barewords, @TieIOMethods, @UNIVERSALMethods and @ExporterSymbols.

Manipulating stashes (Perl's symbol tables) is occasionally necessary, but incredibly messy, and easy to get wrong. This module hides all of that behind a simple API.

Modern::Perl provides a simple way to enable multiple, by now, standard libraries in a Perl program.

Set::IntSpan manages sets of integers. It is optimized for sets that have long runs of consecutive integers.

This package provides tools for inspecting subroutines in Perl.

This module provides routines for parsing date string into time values and formatting dates into ASCII strings.

Scalar::String is about the string part of plain Perl scalars. A scalar has a string value, which is notionally a sequence of Unicode codepoints but may be internally encoded in either ISO-8859-1 or UTF-8. In places, more so in older versions of Perl, the internal encoding shows through. To fully understand Perl strings it is necessary to understand these implementation details. This module provides functions to classify a string by encoding and to encode a string in a desired way. The module is implemented in XS, with a pure Perl backup version for systems that cannot handle XS.

Perl::MinimumVersion takes Perl source code and calculates the minimum version of perl required to be able to run it. Because it is based on the PPI (Perl Parsing Interface), it can do this without loading the code. The distribution comes with a script called perlver.

This module provides some XS functions to assist in writing syntax modules that provide new perl-visible syntax, primarily for authors of keyword plugins using the PL_keyword_plugin hook mechanism.

Sys::SigAction is a Perl extension for Consistent Signal Handling.

Create a command line tool with your Mo, Moo, Moose objects. You have an option keyword to replace the usual has to explicitly use your attribute on the command line. The option keyword takes additional parameters and uses Getopt::Long::Descriptive to generate a command line tool.

PerlIO::utf8_strict provides a fast and correct UTF-8 PerlIO layer. Unlike Perl's default :utf8 layer it checks the input for correctness.

This module provides tools to deal with International Standard Music Numbers.

This package provides Digest::SHA1, an implementation of the NIST SHA-1 message digest algorithm for use by Perl programs.

This module provides bare bones try/catch/finally statements that are designed to minimize common mistakes with eval blocks, and nothing else.

App::Nopaste provides easy access to any pastebin.

This module provides functions for fast and correct file slurping and spewing. All functions are optionally exported.

Devel::Cycle This is a tool for finding circular references in objects and other types of references. Because of Perl's reference-count based memory management, circular references will cause memory leaks.

File::HomeDir is a module for locating the directories that are owned by a user (typically your user) and to solve the various issues that arise trying to find them consistently across a wide variety of platforms.

This module provides tools to deal with International Standard Serial Numbers.

This module provides syntactical support for try/catch control flows.