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tree-sitter-scala 0.21.0

Hi everyone. On behalf of the tree-sitter-scala project, I am happy to announce tree-sitter-scala 0.20.3 and 0.21.0. The first two segments of the version number comes from the tree-sitter-cli that was used to generate the parser, and the last segment is our actual version number.

tree-sitter-scala 0.21.0 uses tree-sitter 0.21.x; and tree-sitter-scala 0.20.3 uses tree-sitter 0.20.x.

About tree-sitter-scala

tree-sitter-scala is a Scala parser in C language, generated using Tree-sitter CLI, and conforming to the Tree-sitter API. Tree-sitter parsers are generally fast, incremental, and robust (ok with partial errors). We publish Rust binding to crates.io.

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the holy graal of GitHub Actions

Last week on sbt/sbt#7427 @keynmol (Anton Sviridov) told me:

@eed3si9n I think this can be reopened, given that Github finally released free Apple Silicon workers - I think it’s best to modify the Github workflow to build all binaries automatically: sbt/sbtn-dist#11

I guess somehow I missed the memo for a whole month, but I’m happy that ARM macOS runners are here! In this post, let’s dig into how we automated GraalVM native image creation using GitHub Actions. If you’re in a hurry, see the working example native.yaml.

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sbt 1.9.9

Hi everyone. On behalf of the sbt project, I’m happy to announce sbt 1.9.9, a Scala 2.13.13 commemorative patch release. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.9.9

See 1.9.0 release note for the details on 1.9.x features.

Highlights

  • To fix console task on Scala 2.13.13, sbt 1.9.9 backports updates to JLine 3.24.1 and JAnsi 2.4.0 by @hvesalai in #7503 / #7502
  • To fix sbt 1.9.8’s UnsatisfiedLinkError with stat, sbt 1.9.9 removes native code that was used to get the millisecond-precision timestamp that was broken (JDK-8177809) on JDK 8 prior to OpenJDK 8u302 by @eed3si9n in io#367
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sbt website update 2024

This is a writeup on sbt’s website scala-sbt.org updates, some concrete, others more of half-baked ideas.

Background

I’ve been the primary maintainer of the site since 2014. Though I have written some of the pages, most of the content had been written by Mark and Havoc by the time I took over. You can see on 2014 archive that the site was Sphinx doc.

The first things I did in 2014 on the site was to migrate from Sphix, which used reStructuredText, to Markdown on Pamflet, a static site generator created by Nathan, and later I inherited.

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vegan osechi 2024

My wife and I prepare osechi (お節), japanese new year food some vegan, others non-veg. Some homemade, others store-bought. This year, we tried to stick to vegan, and documented the process. This is mostly for our own reference, but we hope it might help others out there.

toshikoshi soba (年越し蕎麦)

soba

For good luck, we eat soba noodle at midnight, crossing into new year. I have no idea what the noodle is supposed to symbolize. The goal is to finish up most of the cooking by the end of the year, so you can coast the next day.

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sbt 2.x remote cache

introduction

A remote cache, or a cloud build system, can speed up builds dramatically by sharing build results (Mokhov 2018). This is a feature that I’ve been interested ever since heard about Blaze (now open sourced as Bazel). In 2020, I implemented cached compilation in sbt 1.x. reibitto has reported that “what was once 7 minutes to compile everything now takes 15 seconds.” Others have also reported 2x ~ 5x speedup. While this is promising, it’s a bit clunky and it works only for the compile task. In March 2023, I jotted down RFC-1: sbt cache ideas to outline the current issues and a solution design. Here are some of the problems:

  • Problem 1: sbt 1.x implements remote caching for compile, and disk caching for some other tasks, but we would like a solution that custom tasks can participate
  • Problem 2: sbt 1.x has separate mechanism for disk cache and remote cache, but we would like one mechanism that build user can switch between local or remote cache
  • Problem 3: sbt 1.x used Ivy resolver as the cache abstration, but we’d like a more open design for remote cache backend

As my december adventure 2023 project I decided to tackle the sbt 2.x remote cache feature in my free time. The proposal is on GitHub #7464. This post explores the details of the change. Note: It shouldn’t require too much of sbt internal knowledge, but the target audience is advanced since this is more of an extended PR description.

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JDK 21 and 22-ea on GitHub Actions

JDK 21 just came out, and given its LTS status projects are encouraged to test their code on JDK 21. A few projects are already starting to test on JDK 22-ea as well. Here’s a quick tutorial of how to test your project on GitHub Actions with JDK 21 or JDK 22-ea using actions/setup-java.

JDK 21

For cross building on JDK 21, follow Setting up GitHub Actions with sbt on the official docs.

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sbt 1.9.7

Hi everyone. On behalf of the sbt project, I’m happy to announce sbt 1.9.7 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.9.7

See 1.9.0 release note for the details on 1.9.x features.

Highlights

  • CVE-2023-46122. sbt 1.9.7 updates its IO module to 1.9.7, which fixes parent path traversal vulnerability in IO.unzip. This was discovered and reported by Kenji Yoshida (@xuwei-k), and fixed by @eed3si9n in io#360.
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ifdef in Scala via pre-typer processing

This is part 2 of implementing Rust’s cfg attribute in Scala. In part 1, I tried the annotation macro with a mixed result. I’ve implemented a version of @ifdef that works better.

what does cfg attribute do?

Rust Programming Language says:

Rust has a special attribute, #[cfg], which allows you to compile code based on a flag passed to the compiler.

This lets us write unit test in the same source as the library code like this:

...

#[cfg(test)]
mod tests {
    #[test]
    fn some_test() {
        ...
    }
}

When I first heard about this, it sounded a bit absurd since I’ve never used languages that embeds tests into the main source code. But now that I’ve been working with Rust occasionally, I like the idea of being able to write the tests in the same source, especially for kind of code that can be exercised as functions. When it gets too messy, you can always split them out in src/test/scala/ or tests/ in Rust.

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ifdef macro in Scala

Update 2023-10-15: There’s now a better 0.2.0 that I implemented via pre-typer processing.

Rust has an interesting feature called cfg attribute, which is aware of the build configuration at the language level. This lets us write unit test in the same source as the library code like this:

...

#[cfg(test)]
mod tests {
    #[test]
    fn some_test() {
        ...
    }
}

I implemented an experimental @ifdef macro that does something similar.

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sbt 1.9.5

Update: ⚠️ sbt 1.9.5 is broken, because it causes Scala compiler to generate wrong class names for anonymous class on lambda. Please refrain from publishing libraries with it while we investigate. See cala/bug#12868 for details.

Hi everyone. On behalf of the sbt project, I’m happy to announce sbt 1.9.5 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.9.5

See 1.9.0 release note for the details on 1.9.x features.

Highlights

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tree-sitter-scala 0.20.2

Hi everyone. On behalf of the tree-sitter-scala project, I am happy to announce tree-sitter-scala 0.20.2. The first two segments of the version number comes from the tree-sitter-cli that was used to generate the parser, and the last segment is our actual version number.

About tree-sitter-scala

tree-sitter-scala is a Scala parser in C language, generated using Tree-sitter CLI, and conforming to the Tree-sitter API. Tree-sitter parsers are generally fast, incremental, and robust (ok with partial errors).

Read More…

automate refactoring with Bazel + Scalafix

about Scalafix

As a code base becomes larger, it’s useful to have language tooling that can perform automatic refactoring. Thankfully, in 2016 Scala Center created Scalafix. In the announcement blog post Ólafur Geirsson wrote:

Scalafix takes care of easy, repetitive and tedious code transformations so you can focus on the changes that truly deserve your attention. In a nutshell, scalafix reads a source file, transforms usage of unsupported features into newer alternatives, and writes the final result back to the original source file.

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sbt 1.9.1

Hi everyone. On behalf of the sbt project, I’m happy to announce sbt 1.9.1 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.9.1

See 1.9.0 release note for the details on 1.9.x features.

Highlights

  • Change of contributor license agreement to Scala CLA, which transfers contribution copyrights to the Scala Center, instead of Lightbend by @julienrf (Julien Richard-Foy is Technical Director at Scala Center) in #7306
  • Publishing related bug fixes following up on sbt 1.9.0, contributed by Adrien Piquerez at Scala Center
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