Introduction: Navigating CPAN Module Authorship
Becoming a CPAN module author involves a structured process, beginning with conceptualization and extending through testing and distribution. This detailed guide, based on research titled 'CPAN-Авторство по шагам. Шаг 2.', delineates the initial critical phases for aspiring authors. It focuses on foundational elements such as selecting an appropriate module name and establishing the basic distribution structure.
The journey to CPAN authorship is presented as a series of steps, with the current focus on the second stage. This phase assumes that an author has identified a module they wish to publish and is ready to proceed with its formal packaging and preparation for release. The guide implicitly suggests that prior steps, such as registration, are either ongoing or completed in parallel.
Research Goal: A Structured Approach to Module Preparation
The primary research goal is to provide a methodical framework for preparing a CPAN module for distribution. This includes guidance on naming conventions, the utilization of version control systems, and the initial setup of the distribution using automated tools. The overarching aim is to ensure that authors can efficiently move from a conceptualized module to a distributable package.
This structured approach is designed to streamline the early development and packaging stages, addressing common challenges faced by new module authors. By detailing each sub-step, the guide seeks to empower authors to build a robust foundation for their CPAN contributions, enhancing the quality and discoverability of their modules.
Key Findings: Essential Steps for Module Preparation
The research identifies several crucial steps in preparing a module for CPAN, starting with the fundamental decision of module naming and extending to the creation of its initial distribution and testing. These findings provide a clear roadmap for authors.
1. Module Naming Conventions
One of the initial findings highlights the importance of choosing an appropriate name for a module. This choice is differentiated based on whether the module is 'pragmatic' or 'ordinary'.
Pragmatic Modules
For pragmatic modules, which exhibit behavior similar to built-in pragmas such as use strict, use open, or use lib, specific naming rules apply. The name should be concise, written in lowercase, and should naturally integrate with the 'use' keyword. This ensures consistency with existing Perl syntax and enhances user experience by making the module feel like an integral part of the language.
Ordinary Modules
For ordinary packages, the research suggests that optimal names are typically composed of two words: one noun and either an adjective or a verb. This structure often results in descriptive and intuitive names. Authors are also advised to consider existing, well-established namespaces, such as Devel::*, to maintain organizational consistency within the CPAN ecosystem.
Examples of effective names provided include File::Find, Data::Dumper, and HTTP::Async. These examples illustrate the recommended two-word structure and adherence to common namespace patterns. Conversely, less effective names were also identified, such as POE::Component::NonBlockingWrapper::Base, criticized for being excessively long, and Moose or Catalyst, which are deemed unclear without an accompanying description. These examples underscore the principle that clarity and conciseness are paramount in module naming.
2. Initiating Distribution Creation
After selecting a module name, the next critical step involves creating the distribution itself. The research strongly recommends incorporating a version control system (VCS) from this early stage. This practice is crucial for tracking changes, facilitating collaboration, and managing different versions of the module.
Version Control System Integration
For authors who do not have their own VCS, the research points to public, free options. Specifically, code.google.com (for SVN) and github.com (for Git) are recommended. The use of a VCS ensures that all modifications to the module and its distribution files are systematically recorded, enabling easy rollback to previous states and efficient management of the development process.
Utilizing Module::Starter
The research further details the use of Module::Starter, a utility designed to automate the creation of a module distribution template. The first step in using this tool is to install it, which will also install the module-starter utility. Running module-starter without any parameters provides helpful usage instructions.
Basic Command for Distribution Creation
A simple command is provided for creating a basic distribution template:
module-starter \
--mi \ # используем Module::Install
--module=Mod::Name \ # Указываем имя модуля
--author= Your CPAN Name \ # Указываем свое CPAN-имя
--email= name@cpan.org \ # И emailThis command instructs module-starter to use Module::Install for the build system, specifies the module's chosen name (e.g., Mod::Name), and includes the author's CPAN name and email address. Upon execution, this command creates a directory named after the module (e.g., Mod-Name), which serves as the distribution's foundational template. This generated template can then be immediately committed to the chosen version control system (e.g., SVN).
3. Structuring and Initial Testing
Following the creation of the distribution template, the focus shifts to organizing the module's code and performing preliminary tests to ensure basic functionality.
Module Structure within lib/
Authors are instructed to create the necessary code structure within the lib/ directory of the newly formed distribution. This directory is where the module's core logic resides. Proper organization within this directory is crucial for maintainability and adherence to CPAN standards.
Preliminary Testing with make test
A vital step is to perform an initial test of the module using the make test command, which is typically preceded by perl Makefile.PL. This sequence compiles the module and runs any defined tests. A successful execution of these commands indicates that at least one module within the package compiles correctly.
Example of Successful Test Output
A positive test outcome is characterized by output similar to the following:
t/00-load.........1/1 # Testing Mod::Name 0.01, Perl 5.008009, /usr/local/bin/perl t/00-load.........ok t/boilerplate.....ok t/pod-coverage....ok t/pod.............ok All tests successful. Files=4, Tests=6, 0 wallclock secs ( 0.03 usr 0.03 sys + 0.19 cusr 0.07 csys = 0.32 CPU) Result: PASS
This output indicates that all included tests passed, confirming the module's basic structural integrity and compilation without errors. The PASS result is a crucial indicator of readiness for further development.
4. Versioning and Committing Changes
The research emphasizes the importance of versioning the module and regularly committing changes to the version control system. This ensures a clear history of development and allows for tracking unstable releases.
Setting the Initial Version
Authors are advised to set an initial version number within their module, for instance, by declaring $VERSION= 0.01_1. The underscore in the version number, such as 0.01_1, signifies that the release is not yet stable; it denotes an alpha or beta version. This convention helps users identify modules that are still under active development and may not be fully feature-complete or bug-free.
Committing to Version Control
After setting the version and making any initial changes, all modifications should be committed to the version control system. This practice formalizes the current state of the module's development and makes the changes trackable. Regular commits, especially after significant milestones or when marking an unstable version, are standard development practice.
What's Next: Refining the Distribution
The research concludes by indicating future steps in the CPAN authorship process. The upcoming phase will involve further refinement of the Makefile.PL file and enhancing the test suite. The goal is to evolve the tests into a more user-friendly and robust state, improving the overall quality and reliability of the module.
Simultaneously, authors are encouraged to check their email for registration notifications. If registration is confirmed, managing their account, including setting up an avatar on gravatar.com using their CPAN email, can proceed. This suggests parallel administrative tasks that accompany the technical development of a CPAN module.