Google Summer of Code 2024 Wrap-up

The Haskell.org committee is pleased to present the results of Haskell's participation in the Google Summer of Code 2024. This marks our 13th time taking part in GSoC!

Of the five projects alloted to our organization, four were successfully completed:

• HLS Cabal Plugin Continuation
• LSP Inlay Hints Feature for haskell-language-server
• Continuous Integration Log Explorer Tool
• Parse Error Recovery and Incrementality for GHC

Congratulations to all the contributors and a huge thank you to our wonderful mentors!

HLS Cabal Plugin Continuation

Contributor: Georgii Gerasev Mentor: Fendor

For this project Georgii implemented a number of additions and fixes for the HLS Cabal plugin, improving the developer experience around working with cabal files.

• Fix an issue with completion for shorter file names
• Add an outline view for cabal files
• Integrate the Cabal-add tool as a code action
• Add a go-to definition for modules from exposed-modules and other-modules sections
• Add a hover with links to documentation for build-depends

Read more in the project results write-up.

LSP Inlay Hints Feature for haskell-language-server

Contributor: Jinser Mentor: Michael Peyton Jones

Jinser contributed several features to HLS utilizing inlay hints, which grant developers insights into certain code constructs.

• Provide explicit imports via inlay hints
• Support inlay hints for record wildcards

Continuous Integration Log Explorer Tool

Contributor: Abhinav Kumar Mentor: Bryan Richter

Abhinav's project was aimed at assisting developers in analyzing large CI test logs, particularly for rare intermittent failures, by creating a web-based tool. This tool extends an existing service (Spuriobot) to collect CI log data and store it in a full-text search database. It also includes the development of an improved web UI, offering advanced search capabilities and automatic log integration from GitHub workflows.

Read more in the project results write-up.

Parse Error Recovery and Incrementality for GHC

Contributor: Karim Taha Mentor: Sebastian Graf

Karim contributed an enhancement to the Happy parser generater, namely an error recovery mechanism. GHC's parser was then extended to make use of this new feature. This will allow GHC to report multiple parse errors from a single compilation run and in turn improve how parse errors are presented in tooling such as HLS.

Read more in the project results write-up.