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Perl

Events

This material is being used during the events organized in the Perl-Maven group.

Chat

• OSDC Zulip

How to select a Perl project to contribute to?

• A perl-based project that you use.
• MetaCPAN itself
• CPAN Dashboard
  • See the issues
  • Check my report and fix issues there. SZABGAB
• A module that you use.
• A direct dependency of a project or a module that you use. Listed in one of the files: Makefile.PL, Build.PL, cpanfile, etc.
• An indirect dependency. Dependency tree of a Perl module on CPAN.
• Search on GitHub: A semi-popular, recently updated Perl project stars:100..1000 pushed:>2025-10-01 language:Perl
• Pick a popular project and work on stale PRs. That is PRs where there is already good work, but the original author (of the PR) has vanished.
• CPAN Digger

What and how to contribute to a Perl project?

• Link to VCS: Make sure MetaCPAN links to the VCS of the module. If not, try to locate the source of the module and send a PR updating the meta-data of the project. If you can’t find it, then you might want to send an email to the author asking if the project has a public repository.
• Testing
  • Try to run the tests locally or better yet in a Docker container.
  • Testing articles
  • Testing book
  • Test::More
  • Generate test coverage report Devel::Cover
• CI
  • If there are tests, check if there is a CI?
  • Perl and CI
    • GitHub Actions
  • Setting up CI:
  • GitHub Actions
  • GitLab pipelines
    • examples
    • video
• Dependencies
  • Add dependabot for GitHub Actions.
  • I think Dependabot does not support Perl.
• Code formatting
  • Perl::Tidy
• Linting
  • Perl::Critic
  • Getting Started with Perl::Critic
• Fuzz testing
  • The App-Test-Generator distirbution comes with a tool called fuzz-harness-generator
• Mutation testing
  • Devel::Mutator
• Code complexity analyzis
  • Perl::Critic::CognitiveComplexity
  • Analizo::Metric::StructuralComplexity
  • Perl::Lint has Perl::Lint::Policy::Subroutines::ProhibitExcessComplexity
  • Perl-Metrics-Lite
• Code reading
• Refactoring

See also this issue about the goals.

• Adopt a CPAN module
• Take over a CPAN module.

Projects

• Eugen Konkov asked for help with PRs to DBIx::Class.

• DBIx-Class-Async
  • 2026.01.08
  • Make Meta:CPAN link to GitHub issues - Merged ✅
  • gitignore some generated files - Merged ✅
  • Add GitHub Workflow and add test dependencies - Merged ✅
• JQ-Lite
  • 2026.01.08
  • During our meeting MANWAR created this PR:
  • Small improvements to repository to satisfy Kwalite - Waiting 🕰️
• Doubly-Linked-PP
  • 2026.01.07
  • PR: add meta-data to allow MetaCPAN to link to public repository - Merged ✅
• Net-Clacks
  • 2026.01.07
  • I sent an email to Rene Schickbauer - Waiting 🕰️
• MetaCPAN::Client
  • 2026.01.06
  • Issue: Reference {“relation” => “eq”,”value” => 14646} did not pass type constraint “Int” - Fixed ✅
• Exception-Reporter-Summarizer-PlackRequest
  • 2026.01.06
  • Issue: Why is the repo not included in META.json? - Waiting 🕰️
• Geo-IP2Proxy
  • 2026.01.05
  • PR: add meta-data to allow MetaCPAN to link to the repository - Waiting 🕰️
• Common-CodingTools
  • 2025.12.26
  • PR: Add links to VCS - Waiting 🕰️
  • PR: Add .gitignore - Waiting 🕰️
  • PR: Add GitHub Actions - Waiting 🕰️
  • PR: Add test - Waiting 🕰️
• JSON::Schema::Validate
  • 2025.12.01
  • Showcase: Localised JSON Schema validation in Perl
  • PR: add .gitignore file - Waiting 🕰️
  • PR: Setup CI - GitLab pipeline - Waiting 🕰️
  • Open issue
  • Also check out the GitLab pipeline of the Wanted module
• SVG
  • 2025.11.11
  • As I am a maintainer of this project I could commit and push directly:
  • add a test case to check loading attributes and trying to load bad attribute ✅
  • add a test case for creating new instance from an existing one ✅
• Net-Async-Redis-XS
  • 2022.12.02
  • Article: Add GitHub Action CI to the Net-Async-Redis-XS Perl module
  • PR: Add GitHub Actions for CI - Merged ✅
• Win32-Wlan
  • 2022.12.05
  • Article: CI for Win32-Wlan Perl module
  • PR: Add GitHub Actions to run the tests on every push - Merged ✅
• RDF::KV
  • 2022.12.07
  • Article: Be pragmatic setting up CI for the RDF::KV
  • PR: Add GitHub Actions - Waiting 🕰️
• Perl::Efl
  • 2022.12.08
  • Article: Adding CI to Perl::Efl - sometimes you need to do some extra work
  • PR: Add GitHub Actions - Merged ✅
• Mojo-UserAgent-Cached
  • 2022.12.09
  • Article: CI for Mojo-UserAgent-Cached and Plack-Middleware-Greylist
  • PR: Add GitHub Actions - Merged ✅
• Plack-Middleware-Greylist
  • 2022.12.09
  • Article: CI for Mojo-UserAgent-Cached and Plack-Middleware-Greylist
  • PR: Add GitHub Actions - Merged ✅
• Log::Any
  • 2022.12.14
  • Article: CI for the Log::Any Perl module
  • PR: Add GitHub Actions - Merged ✅
• Marpa::R2
  • 2022.12.16
  • Article: Moving from Travis-CI to GitHub Actions for Marpa::R2
  • Issue: CI: Does Travis-CI still work for you?
  • Issue: IO::Select and other modules in the IO package report version 1.49 whle IO itself is 1.50
  • Issue: cpan/engine/read_only/tests/* files missing
  • PR: Add GitHub Actions - Rejected ❌ (it will be setup later)
• Plack-Middleware-LogAny
  • 2022.12.19
  • Article: CI for Plack-Middleware-LogAny
  • PR: add github actions - Waiting 🕰️
• MIME-Types
  • 2022.12.24
  • Article: CI for perl5-MIME-Type
  • PR: Add GitHub Actions - Merged ✅
• Data::Alias
  • 2022.12.25
  • Article: CI for Data::Alias in Perl - including threaded perl
  • PR: Add GitHub Actions - Merged ✅

Notes

• In the Dist::Zilla world Dist::Zilla::Plugin::GithubMeta adds the META information based on a github remote called ‘github’ or ‘origin’.