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ifdef 0.4.1

@ifdef is a Scala compiler plugin that implements conditional compilation in Scala. ifdef 0.4.1 supports Scala JVM, JS and Native.

Scala Version JVM JS (1.x) Native (0.5.x) sbt plugin
3.x ✅ ✅ ✅ ✅
2.13.x ✅ ✅ ✅ n/a
2.12.x ✅ ✅ ✅ ✅
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Gigahorse 0.9.0

Gigahorse 0.9.0 is released. Gigahorse is an HTTP client for Scala that I started in 2016, with multiple backend support: Apache HttpClient 5.x, AsyncHttpClient 2.12.x, OkHttp 3.x, and Pekko HTTP 1.x.

Gigahorse 0.9.0 is JDK 8 compatible. See documentation for more details on Gigahorse itself.

multipart/form-data support

Gigahorse 0.9.0 adds multipart/form-data upload support on all backends.

This is generally useful for uploading files.

sbt:gigahorse> commonTest/bgRun
[info] running gigahorsetest.TestApp
Server(List(SocketBinding(64312,0.0.0.0)), ...)

sbt:gigahorse> ++3.3.5
sbt:gigahorse> apacheHttp/console

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Gigahorse 0.8.0

Gigahorse 0.8.0 is released. Gigahorse is an HTTP client for Scala that I started in 2016, with multiple backend support. See documentation for more details on Gigahorse itself.

Gigahorse 0.8.0 features Apache HttpComponent HttpClient 5.x, replacing the now deprecated HttpAsyncClient 4.x.

scala> import gigahorse.*, support.apachehttp.Gigahorse

scala> import scala.concurrent.*, duration.*

scala> val http = Gigahorse.http(Gigahorse.config)
val http: gigahorse.HttpClient = gigahorse.support.apachehttp.ApacheHttpClient@6e571cd9

scala> val r = Gigahorse.url("https://api.frankfurter.dev/v1/latest").get.addQueryString("base" -> "USD")
val r: gigahorse.Request = Request(https://api.frankfurter.dev/v1/latest, GET, EmptyBody(), Map(), Map(base -> List(USD)), None, None, None, None, None, None)

scala> val f = http.run(r, Gigahorse.asString)
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
val f: scala.concurrent.Future[String] = Future(<not completed>)

scala> Await.result(f, 120.seconds)
val res0: String = {"amount":1.0,"base":"USD","date":"2025-04-11","rates":{"AUD":1.6042,"BGN":1.7238,"BRL":5.831,"CAD":1.3869,"CHF":0.81544,"CNY":7.2994,"CZK":22.164,"DKK":6.5816,"EUR":0.88137,"GBP":0.76395,"HKD":7.7552,"HUF":360.39,"IDR":16855,"ILS":3.7209,"INR":86.09,"ISK":128.06,"JPY":142.84,"KRW":1431.68,"MXN":20.38,"MYR":4.4225,"NOK":10.665,"NZD":1.7254,"PHP":57.065,"PLN":3.7857,"RON":4.3872,"SEK":9.8006,"SGD":1.3213,"THB":33.555,"TRY":38.058,"ZAR":19.2834}}

scala> http.close()

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sbt 2.0.0-M4

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 2.0.0-M4, a beta version of sbt 2.x. Please try it out, and report any issues you might come across. Note that sbt 2.x is released under Semantic Versioning, and the plugins will need to be published for the specific milestone version.

I work on sbt in my own time with collaboration with Adrien Piquerez and other volunteers, like Kenji Yoshida, Jerry Tan, Matthias Kurz (Play maintainer), and recently Billy at EngFlow to name a few.

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sbt 1.10.9

Hi everyone. On behalf of the sbt project, I’m happy to announce that sbt 1.10.9 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.10.9.

  • There’s now sbt 1.10.10
  • sbt 1.10.8 is skipped since we found a bug post-release

See 1.10.0 release note for the details on 1.10.x features.

Highlights

  • Adds allowUnsafeScalaLibUpgrade setting
  • Zinc bug fix to improve local source dependency invalidation
  • sbtn client-side run capability (not enabled in sbt 1.x)
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sudori part 7: client-side run with sbt

This is a blog post on sbt 2.x development, continuing from sbt 2.x remote cache, sudori part 4, part 5 etc. I work on sbt 2.x in my own time with collaboration with the Scala Center and other volunteers, like Billy at EngFlow. Lately I’ve been working on a feature called client-side run, a feature I’ve thought sbt should have for a long time.

what is client-side run?

A client-side run is an execution of the user-land program initiated at the client-side, without blocking the sbt server. I should probably unpack the details for this to make sense.

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december adventure 2024

I’m going to try to work on something small everyday during december. see the original December Adventure.

my goal: work on sbt 2.x, other open source like sbt 1.x and plugins, or some post on this site, like music or recipe.

2024-12-31

checking out Boston suburbs. had coffee at Tatte Bakery & Cafe, and skated a bit at Newton Centre Playground nearby.

in the evening, we picked up some veggies at Whole Foods, dinner from 八福川菜 (Sichuan Gourmet House), and prepped for the midnight soba noodle, and ozouni for the new year.

addressed a review comment on io#397, which retries non-IOExceptions.

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ifdef 0.4.0

@ifdef is a Scala compiler plugin that implements conditional compilation in Scala. ifdef 0.4.0 supports Scala JVM, JS and Native.

Scala Version JVM JS (1.x) Native (0.5.x) sbt plugin
3.x ✅ ✅ ✅ ✅
2.13.x ✅ ✅ ✅ n/a
2.12.x ✅ ✅ ✅ ✅
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back publishing actually

This is part 2 of tag-based back publishing using sbt-ci-release.

sbt-ci-release 1.9.2

Now that sbt 2.0.0-M3 is out, I tried sbt-ci-release 1.9.0 for back publishing, but immediate ran into a bug related to version setting, so I had to fix that in sbt-ci-release 1.9.2.

// plugins.sbt
addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.2")

Note sbt-ci-release 1.9.x implements a mini DSL for the Git tag:

version[@command|@a.b.c|@a.b."x"][#comment]
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sbt 2.0.0-M3

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 2.0.0-M3, a beta version of sbt 2.x. Please try it out, and report any issues you might come across. Note that sbt 2.x is released under Semantic Versioning, and the plugins will need to be published for the specific milestone version.

I work on sbt in my own time with collaboration with Adrien Piquerez at Scala Center and other volunteers, like Kenji Yoshida, Jerry Tan, Matthias Kurz (Play maintainer), and recently Billy at EngFlow to name a few.

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intro to Hedgehog for Scala

In this post, I want to talk about Hedgehog for Scala, a property-based testing framework created by Charles O’Farrell around 2018, and has been maintained by Kevin Lee more recently, based on Haskell Hedgehog, which was cofounded by Jacob Stanley and Nikos Baxevanis.

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sbt 1.10.3

Hi everyone. On behalf of the sbt project, I’m happy to announce that sbt 1.10.3 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.10.3

See 1.10.0 release note for the details on 1.10.x features.

Highlights

  • CVE-2024-7254. sbt 1.10.3 updates protobuf-java library to 3.25.5 to address reported potential Denial of Service
  • Updates metabuild Scala version to 2.12.20
  • Fixes for the spurious “illegal reflective access operation” error on JDK 11
  • Reverting the invalidation of circular-dependent sources
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Scala 3 Manifesto 0.1.0

Over the weekend, I created Scala 3 Manifesto 0.1.0, a small library to re-implement scala.reflect.Manifest in Scala 3.

Programming languages operate at two levels. First, the material level where bits and bytes are moved to take actions. Second, there is a higher, spiritual level that describes the material level. The first level is the runtime. The second level is the compile-time. Scala programs are written using val terms that are typed, but at the JVM bytecode, JS, or Native, the variables turn into something different, often more general. For example, a variable typed to List[Int] becomes List[AnyRef] at runtime.

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sbt 2.0.0-M2

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 2.0.0-M2, a beta version of sbt 2.x. Please try it out, and report any issues you might come across. Note that sbt 2.x is released under Semantic Versioning, and the plugins will need to be published for the specific milestone version.

I work on sbt in my own time with collaboration with Adrien Piquerez at Scala Center and other volunteers, like Kenji Yoshida, Jerry Tan, Matthias Kurz (Play maintainer), and recently Billy at EngFlow to name a few.

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RFC-4: persistent worker

  • Author: Eugene Yokota
  • Date: 2024-09-10
  • Status: Review

See RFC-2 for the process. In sbt 2.0 ideas I wrote:

idea 5: BSP support + persistent workers

To preventing blocking the sbt server, we should consider shipping off long-running tasks to persistent workers, similar to today’s fork or bgRun. The candidate tasks are run, test, and console, but compile could be one too.

I mostly had Bazel’s persistent worker specification in my mind.

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sudori part 5

This is a blog post on sbt 2.x development, continuing from part 3, sbt 2.x remote cache, sbt 2.x remote cache with Bazel compatibility, sudori part 4 etc. I work on sbt 2.x in my own time with collaboration with the Scala Center and other volunteers, like Billy at EngFlow. These posts are extended PR descriptions to share the features that will come to a future version of sbt.

introduction

I was on a late summer vacation in a beach town in Connecticut this week — checking out local skate spots, dipping into cool Long Island Sound, and comparing lobster rolls. In between skateboarding and beach going, I worked on remote test caching in sbt, and a few experiments related to the idea. I’d like to share some of my findings here, mostly as a development write-up.

In sudori part 4 we looked into remote caching of compile task. While caching compile is useful, most of the CI (continuous integration) systems spend their time running tests, not just compiling code. Bazel achieves orders-of-magnitude faster CI in part due the default test command being remote cached. In other words, using Bazel, if a test runs once on a CI machine, the test result will be cached until its input changes.

An advanced sbt user might note that sbt already includes the testQuick task for local incremental testing. The issue with testQuick is that its invalidation relies on timestamps, which are non-hermetic, and thus not reproducible across machines. In this post, we’ll discuss test caching for sbt 2.x that can be shared safely across the machines. The corresponding pull request is sbt/sbt#7644.

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ollie

I’m a permanently beginner-level staker, who cannot ollie, but I’ve been thinking about ollie, and here’s a memo to collect various ideas.

Mark Suciu’s ollie from 2014

It would be good to have a reference ollie. Here’s Mark Suciu from ten years go:

It’s not easy to find a plain ollie in a part, but this one captures one from the side angle. The whole thing takes place in the first 3s of the clip, and the actual Ollie probably in a second.

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sudori part 4

This is a blog post on sbt 2.x development, continuing from sudori part3, sbt 2.x remote cache, and sbt 2.x remote cache with Bazel compatibility. I work on sbt 2.x in my own time with collaboration with the Scala Center. These posts are extended PR descriptions to share the features that will come to the future version of sbt, hopefully.

August 2024 status quo

Since April, 2024, we have had Bazel-compatible remote cache capability. The implementation currently supports file output as a cached side effect. In other words, even if we start from a fresh machine, if the remote cache is hydrated, we can download JAR files from the cache instead of running the compiler.

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tree-sitter-scala 0.22.1

Hi everyone. On behalf of the tree-sitter-scala project, I am happy to announce tree-sitter-scala 0.22.1. 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 0.22.0 uses tree-sitter 0.22.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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how to see the trees using the Scala compilers

Here’s a memo on how to show trees using the Scala compilers. While this likely won’t be relevant for normal usage of Scala, having the direct knowledge of the tree can be useful when developing tooling or during metaprogramming.

Scala 2.13.14

Let’s use the following example:

package example

object Main extends App {
  println("hello")
}

Here’s how you can show the AST using Scala 2.13.14:

$ sdk install scala 2.13.14
$ sdk use scala 2.13.14
$ scalac --version
Scala compiler version 2.13.14 -- Copyright 2002-2024, LAMP/EPFL and Lightbend, Inc.
$ scalac -Vprint:parser,typer -Ystop-after:typer -Yprint-trees:format Hello.scala
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ten things I like about Scala 3

I am sometimes asked what I like so much about Scala 3, so here’s a list in no particular order. Note that this is based on my personal taste informed by how I use Scala 3, and how I’d like to use Scala 3 more.

I hate it when you make me laugh,
even worse when you make me cry
I hate it when you’re not around and the fact that you didn’t call
but mostly I hate the way I don’t hate you,
not even close,
not even a little bit,
not even at all

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tree-sitter-scala 0.22.0

Hi everyone. On behalf of the tree-sitter-scala project, I am happy to announce tree-sitter-scala 0.22.0. 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 0.22.0 uses tree-sitter 0.22.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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sbt 1.10.0

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.10.0. This is the tenth feature release of sbt 1.x, a binary compatible release focusing on new features. sbt 1.x is released under Semantic Versioning, and the plugins are expected to work throughout the 1.x series. Please try it out, and report any issues you might come across.

The headline features of sbt 1.10.0 are:

  • SIP-51 Support for Scala 2.13 Evolution
  • A wide range of Zinc fixes contributed by Jerry Tan and others
  • CommandProgress API
  • ConsistentAnalysisFormat: New Zinc Analysis serialization
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sbt 1.10.0-RC2

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.10.0-RC2. This is the tenth feature release of sbt 1.x, a binary compatible release focusing on new features. sbt 1.x is released under Semantic Versioning, and the plugins are expected to work throughout the 1.x series. Please try it out, and report any issues you might come across.

The headline features of sbt 1.10.0 are:

  • SIP-51 Support for Scala 2.13 Evolution
  • A wide range of Zinc fixes contributed by Jerry Tan and others
  • CommandProgress API
  • ConsistentAnalysisFormat: New Zinc Analysis serialization
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sbt 2.x remote cache with Bazel compatibility

This is part 3 of the sbt 2.x remote cache series. I’ve have been developing sbt 2.x for a few years in my own free time, and lately Scala Center is joining the effort. These posts are extended PR descriptions to share the features that will come to the future version of sbt, hopefully.

About a year ago I proposed a design for automatic cached task for sbt 2.x in RFC-1: sbt cache ideas, and in the sbt 2.x remote cache post I implemented and dug into the details of caching:

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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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