Introduction to CPAN Authorship: The Initial Steps
The journey into CPAN (Comprehensive Perl Archive Network) module authorship involves a structured process, beginning with fundamental decisions about module identity and culminating in the preparation of a distribution for potential release. This article delves into the early stages of this process, providing a detailed guide on how to approach module naming and the preliminary steps for creating a module distribution. The information presented is based on a guide titled "CPAN-Авторство по шагам. Шаг 2." from Co.Design, focusing on practical instructions for aspiring CPAN authors.
Research Goal: Navigating Module Naming and Distribution Setup
The primary research objective of this guide is to delineate the initial, critical phases of preparing a module for CPAN. Specifically, it aims to inform authors on how to choose appropriate names for their modules and how to use tools like `Module::Starter` to initiate the creation of a module distribution. This structured approach helps ensure that modules are well-named and properly formatted from the outset, contributing to their clarity and maintainability within the CPAN ecosystem.
The guide emphasizes the importance of making informed decisions at these early stages, as they can significantly impact a module's visibility, usability, and acceptance within the developer community. By providing clear steps and recommendations, the research serves as a foundational resource for individuals embarking on CPAN development.
Key Findings: Module Naming Conventions
One of the central findings elaborated in the research concerns the critical process of naming a module. The guide differentiates between two primary types of modules: pragmatic modules and regular modules, each with distinct naming guidelines designed to enhance clarity and consistency within the Perl programming environment.
Pragmatic Module Naming
For pragmatic modules, which mimic the behavior of built-in Perl pragmas such as use strict, use open, or use lib, the naming conventions are specific. The research explicitly states that the name of a pragmatic module "must combine with the word use, be short enough, and be written in lowercase." This rule ensures that pragmatic modules seamlessly integrate with existing Perl conventions, making them intuitive for developers to use. The emphasis on brevity and lowercase formatting aligns with the established style of core Perl pragmas, promoting a cohesive user experience.
Regular Module Naming Guidelines
In contrast, for regular modules, the research recommends a different naming strategy. According to the guide, "the best names for regular packages are those consisting of two words, one of which is a noun, the other an adjective or a verb." This structure aims to create descriptive yet concise module names that convey their purpose effectively. Examples of "good names" provided include File::Find, Data::Dumper, and HTTP::Async. These examples illustrate the success of combining a noun with another descriptive word to form a clear and functional module identifier.
The research also advises authors to "look at currently existing, generally accepted namespaces, e.g., Devel::*." This recommendation encourages authors to leverage established hierarchical naming structures, which can provide context and organize modules logically. By adhering to these conventions, new modules can find their place within the broader CPAN taxonomy, improving discoverability and reducing naming conflicts.
Examples of Naming Effectiveness
To further illustrate effective and ineffective naming, the guide offers specific examples. It identifies POE::Component::NonBlockingWrapper::Base as a "bad name" due to its excessive length. Similarly, Moose and Catalyst are cited as "bad names" because, without reading their descriptions, their purpose remains unclear. These examples underscore the importance of both conciseness and descriptive clarity in module naming, reinforcing the idea that a good name should ideally communicate a module's function without requiring extensive additional explanation.
Key Findings: Establishing the Module Distribution
Beyond naming, a significant portion of the research focuses on the practical steps involved in setting up a module distribution. This phase is crucial for organizing the module's files, managing its development, and preparing it for eventual release.
Utilizing Version Control Systems
The guide strongly recommends the immediate adoption of a version control system (VCS) at this stage. It states, "I recommend at this step to immediately acquire a version control system." For those without their own private VCS, the research suggests using "public free ones," specifically mentioning code.google.com (for SVN) and github.com (for Git). The integration of VCS from the outset is presented as a best practice for managing code changes, facilitating collaboration, and maintaining a robust development workflow.
Leveraging Module::Starter
A central tool for distribution creation highlighted in the research is Module::Starter. Authors are instructed to "Install Module::Starter" which will also install the `module-starter` utility. The guide provides a command-line example for its use:
module-starter \
--mi \ # use Module::Install
--module=Mod::Name \ # Specify module name
--author='Your CPAN Name' \ # Specify your CPAN-name
--email=name@cpan.org # And email
This command generates a template directory named Mod-Name, which serves as the foundational structure for the new distribution. The research notes that this template can then be immediately committed to a version control system (e.g., SVN).
Structuring the Module and Initial Testing
Following the creation of the template, the next step involves developing the module's core logic. The guide instructs authors to "Create all the necessary structure in lib/. this is actually your module." This indicates that the main module files reside within the lib/ directory of the distribution structure.
A crucial part of the development process is initial testing. The research advises authors to "Try to execute make test (perl Makefile.PL && make test)." This command compiles the module and runs any included tests. The expected output for successful execution is shown as:
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
The successful outcome of these tests, particularly the "PASS" result, signifies that "at least 1 module from your package compiles." This serves as an initial verification of the module's structural integrity and basic functionality.
Versioning and Version Control Commit
Before proceeding to further development, the research specifies a versioning step: "While writing in the module, $VERSION = 0.01_1." The underscore \in the version number, such as \in $0.01\textunderscore1$, is explained as an indicator that "this is not a stable release, but an alpha/beta." This practice clearly communicates the development status of the module to potential users.
Finally, all changes, including the initial module code and the specified version, are to be committed to the version control system: "and upload all changes to svn." This step formalizes the initial state of the module within the VCS, marking a significant milestone in its development.
What's Next: Further Development and Account Configuration
The guide concludes by briefly looking ahead to subsequent steps. The next phase will involve "completing Makefile.PL and refining tests to a state where they are convenient to use." This suggests a focus on hardening the build process and enhancing the reliability and usability of the module's test suite.
Concurrently with these technical steps, the research touches upon administrative aspects. It advises authors to "Go check your mail, if the registration notification has arrived." If the registration is complete, authors can then proceed to "configure the account." This includes a practical hint: "Hint: avatars are uploaded to gravatar.com, via CPAN E-Mail (name@cpan.org)." These final points underscore that CPAN authorship involves both technical module development and the management of one's public author profile.