Haskell Weekly

Welcome to another issue of Haskell Weekly! Haskell is a safe, purely functional programming language with a fast, concurrent runtime. This is a weekly summary of what’s going on in its community.

Featured

• Diverk: a Reflex app to browse GitHub repos by jecaro

  That’s a super simple app that allows you to browse and search in the default branch of a GitHub repo. It can render markdown files. I’m a big note taker and all the notes I take live in a private git repo in this format. That was an additional motivation for me to do this project.

• More traversals and more Cabal SAT by Oleg Grenrus

  In the previous post I discussed using traversals for batch operations. I forgot to mention any libraries which actually do this. They are kind of hard to find, as often the Traversable usage comes up very naturally.

• Reason Isomorphically! by Ralf Hinze, Daniel W. H. James

  When are two types the same? In this paper we argue that isomorphism is a more useful notion than equality.

• Sovereign Tech Fund invests in Cabal as critical Haskell infrastructure by Well-Typed

  We are delighted to announce that the Sovereign Tech Fund is investing in the development and maintenance of Cabal, the Haskell build system, following a proposal Well-Typed submitted to the “Improve FOSS Developer Tooling” challenge.

• SQLiteDAV - A WebDAV Server for SQLite Databases by Adrian Sieber

  SQLiteDAV allows you to access your SQLite databases over the WebDAV protocol by mapping tables, rows, and columns to files and folders.

• The Haskell Unfolder Episode 13: open recursion by Andres Löh, Edsko de Vries

  Open recursion is a technique for defining objects in Haskell whose behaviour can be adjusted after they have been defined. It can be used to do some form of object-oriented programming in Haskell, and is also an interesting technique in its own right.

Jobs

• Haskell Tech Lead (fully remote) by Serokell

  We’re seeking an experienced Software Engineer to supervise a team of software engineers. Our work is not limited to Haskell development, so you’ll also be involved in overseeing other exciting areas such as research, frontend, and packaging.

Trying to hire a Haskell developer? You should advertise with us!

In brief

• Alternatives to jupyter notebooks for haskell by Pluto

  Are there alternatives to jupyter notebooks for haskell?

• Best way/resource to learn Haskell with a week to spare by unlikelytom

  So I’ll be joining a company in 10 days that primarily uses Haskell. I want to be better prepared when I join.

• GitHub action updates Haskell Stack dependencies to the latest LTS version

• VR headset running Haskell

Show & tell

• DevOps Weekly Log, 2023-10-29 by Bryan Richter

  The short version is that I am working on migrating Stackage to Haskell Foundation maintainership. I’ve started with the Stackage builder, which tests that everything in a snapshot can be built together, and then I’ll move on to other pieces like Stackage.org and the public casa server.

Call for participation

• Opportunity for improving GHC: fixing some spurious failures in CI by Bryan Richter

  I was asked about spurious failures in GHC CI, and figured the answer was worth a public post. There are three frequent causes of spurious failure that someone with a bit of experience could take a look at. I would be happy to assist.

• haskell-language-server: Use cabal-add to fill missing build-depends automatically