blogs.perl.org

Back to my favourite topic AWS, today I am exploring AWS S3 Bucket Events.
Please check out the link for more information:
https://theweeklychallenge.org/blog/aws-s3-bucket-events

On my last post I asked Gemini to create a product requirement document to outline a plan to improve the overall state of the ev-calc-pricing application. In this blog entry I will discuss my interaction with Gemini and how it increased code coverage of the ev-calc-pricing application. Below is an example of the prompts:

----
> review PRD.md for @ev-calc-pricing

╭────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ ✓ ReadFile PRD.md │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
✦ The PRD.md outlines a plan to refactor the ev-calc-pricing application to improve maintainability, data accuracy, and
robustness.

Key issues identified:
* Manual, hardcoded electricity rate data in StateRates.pm.
* Minimal test coverage.
* Unused scripts and lack of input validation.

The plan focuses on four epics:
1. Automated Data Pipeline: To fetch, process, and load electricity rate data automatically.
2. Comprehensive Test Suite: To ensure accuracy and stability of calculations and data loading.
3. Code Refactoring and Cleanup: To remove hardcoded data, unused scripts, and consolidate data files.
4. Enhanced User Experience: To add input validation and better user feedback.

The code is in this gist

insert_multi_p will let you insert multiple rows in Postgres with a single query, like this:

Get at the usual place...
Elsewhere, I've moved house, into a retirement village.
Yes, folks. I'm 75, much to my horror and astonishment.
It was an exhausting process, but I'll settled in now. And still programming!
And not just the wikis. I have various other projects I can get back to now I've moved.
Why move?
Because I downsized. The price difference gives me a little bit of money in the bank.

One more contribution, OpenAPI::Linter to validate and lint OpenAPI Specification. For more information, please follow the link:
https://theweeklychallenge.org/blog/openapi-linter

In my previous blogpost I briefly discussed the use of Gemini Cli on a Perl dancer application to analyze its codebase. The next step is to generate a product requirement document. Why is this important ? well I had a bad experience with Gemini on another application where I allowed it to roam free "YOLO" mode and it basically started fixing all the problem areas one after another for about an hour or so until my free trial of Google Gemini expired for the day. This resulted into a completely rewritten application that was not able to run due to so many different errors. The cool thing is that I had version control so a good old "git reset --hard Head" cleared up my project and I could start over again.

Only Paul and Aristotle this time.

We had a small amount of helpful feedback on the named signature parameters PR. Paul wants to merge by the end of the week for the purposes of inviting more feedback, assuming no issues are raised in the meantime.

[P5P posting of this summary]

Every year we “welcome” a new bunch of trainees into our department. Young, intelligent and enthusiastic, their psyche and physique have yet to be shaped to accommodate cynical scepticism, efficient laziness, and an integument thickened by years of abuse into something that offers natural protection from radiation emanating from the monitors they will stare at all day playing Solitaire.

One such fellow, let’s call him Nik the Greek, came up to me with that sickening joie de vivre characteristic of youth, and proceeded to reveal how eager he was to demonstrate his enormous intellectual assets. I would have raised an eyebrow, had I the energy to do so. But been there, done that. I was once his age I suspect, though either I can’t remember or have developed a block to my memories as an act of self-preservation.

Dancer2 2.0.1 has been released. It's a small maintenance release that fixes a few broken documentation links.

Enjoy, and keep Dancing!

Jason / CromeDome

In the last few months I have been learning Flutter and Dart and recently I saw a youtube video from our very own Perl Wizard Randal Schwartz ( Vibe-coding with Gemini CLI ) where he is exploring the use of Google Gemini to vibe code Flutter applications. Gemini Cli is a command line tool that gives you the power of Gemini AI right in your command line prompt. In the beginning of Randal's adventure with Gemini he wrote this AI prompt "review the app @youtube_watcher. Tell me the Good, the Bad and the Ugly." and AI delivered a very detailed response on what is and isn't working within the application.

After seeing this very detailed report I decided to do the same on ev-calc-pricing a perl dancer project I worked on and I was amazed to see Gemini work on a perl dancer project. At this point I realize that Gemini is capable of assisting coders in any language/ framework and it can provide insight on software engineering best practices for you application.

Introducing YaraFFI, minimal Perl FFI bindings for the YARA malware scanning engine.
For more information, please follow the post below:
https://theweeklychallenge.org/blog/yara-malware-scanner

https://binary.golf/6:

Binary Golf Grand Prix is an annual small file format competition, currently in it's sixth year. The goal is to make the smallest possible file that fits the criteria of the challenge.

This year's BGGP challenge was to output or display 6. I always wanted to work with actual machine code, so I decided to submit a DOS COM executable. Why? Because the COM format has no headers or other metadata; you can just put some x86 instructions in a file and run it directly.

Having no experience with DOS, I started by looking up a "hello world" example and found https://github.com/susam/hello:

MOV AH, 9
MOV DX, 108
INT 21
RET
DB 'hello, world', D, A, '$'

All three of us attended.

• We touched on the recent discussion about the classification of modules included with the perl distribution. We agreed that the PSC and p5p need to do a better job of tracking which modules have active maintainers and who they are. Something like a dashboard would be useful for this, and we identified as a starting point that it would be good to have an up-to-date overview of dists, their maintainers, and whether they are active. Maintainers.pl probably already covers the list of dists but it would be useful to split the data out into a separate file so it could be used in other scripts, which could also populate records with additional data, outside of what Maintainers.pl needs, for their own purposes. For example a tool for querying PAUSE for the maintainers of dual-life dists and flagging deviations could check a custom field where known deviations (along with a comment) would be recorded, so as to not flag them.
• We had a somewhat surface-level discussion about the future of stdio in Perl. Leon has been thinking about this and intends to write a separate mail to p5p about it.

[P5P posting of this summary]

Available from the Wiki Haven.
I have still not had time to update CPAN::MetaCustodian, so it does not yet work correctly with the latest version of Perl.Wiki.html.

Class::Mite is getting better relatively as numbers shown in the post below: https://theweeklychallenge.org/blog/bless-vs-class-mite

The Experiment

At the beginning of the year, we ran a small experiment at work. We hired four annotators and let them rate 900 sentences (the details are not important). To decide whether the inter-annotator agreement was significant, we calculated (among others) Krippendorff’s alpha coefficient.

I’d used Perl for everything else in the project, so I reached for Perl to calculate the alpha, as well. I hadn’t found any module for it on CPAN, so I wrote one: I read the Wikipedia page and implemented the formulas.

The Real Data

The experiment was promising, so we got additional funding. We hired 3 more annotators, and a few months later, another nine. This increased the number of raters to 16. So far, they’ve rated about 200K sentences. Each sentence has been annotated by at least two annotators (usually three).

One day, I decided to calculate the inter-annotator agreement for the new data. To my surprise, the calculation took more than 6 hours.

We finally managed to arrange our first regular meeting between the three of us.

• Largely we discussed strategy for the named parameters branch. We agreed to merge soon (so people start playing with it), just staying ready to back it out well before release, in case it proves not to be ready.
• In that context, we considered the situation with experiment warnings. We agreed that named parameters should be an additional experiment of its own, though it is an adjunct of another experiment – and we do not yet have established ways of dealing with such a situation. We want to think about how our experiment mechanism should be extended to cover such cases.

[P5P posting of this summary]

Without weighing in to the pros and cons of using a Monorepo approach to your organizations codebase, I am interested in hearing about tools and approaches that have been used with Perl.

For example, I have found that Bazel has Perl support which seem fairly actively. I wonder if there is anything that can integrate with Dist::Zilla? Or any way of managing pulling third party code?

Experiences with CI/CD in the normal Git hosting platforms are also of interest - although it does seem like Github and Gitlab are designed around death-by-repo - and I have seen some features to vary the "actions" behavior based on whats changed. I am however just as interested in if you have had experiences with other platforms please chime in!

Fwiw I realize that perhaps Git isn't the best for Monorepos (although you could argue that the Linux Kernel is in a monorepo) and I have no issue with current alternatives and upcoming ones.

Any plugins that can help? For anything mentioned or not.

Totally open ended question. Please comment!

At long last - Dancer2 2.0.0!

I apologize it took longer than expected - open source doesn't always move as fast as we'd like it to - but there's a lot of great things in this release that make it worth the wait.

Head on over to Perl.com to check out the details. Here's a quick summary of what's new:

• New documentation, courtesy of a grant from the Perl and Raku Foundation
• Extendable config system, thanks to Mikko Koivunalho
• Removed Dancer2::Template::Simple from core Dancer2
• Retired our fork of Template::Tiny, and integrated our changes into the core distribution (thanks, @ether!)
• Configurable data/secrets censoring with Data::Censor
• Logging of hooks as they are executed
• New hook: on_hook_exception
• CLI improvements:
  • Changes that allow for scaffolding of other things (plugins, etc.) in future Dancer2 releases
  • Scaffolding of tutorial app

We're really excited for this release, and we hope you are too!

Keep Dancing!

Jason/CromeDome

Design Pattern Factory: Moo vs experimental class feature.
Please check out the link for more information:
https://theweeklychallenge.org/blog/design-pattern-factory