🎄 support Scala Center 🎄

The economic cycle seems to come and go like a slow tide, and sometimes the tech companies also get caught in the middle. Fortunately, Scala seems to be used by some of the leading companies, and although I’ve started using Scala and have been contributing the community mostly for the pure joy of it, time and time again when I was in a bind the Scala community has helped me back by giving me encouragements and career opportunities. I resigned Twitter about a month ago, but I will be more than ok :)

fast Scala 3 parsing with tree-sitter

requiem for effective engineering (2022.12 mixtape)

• Spotify: https://open.spotify.com/playlist/1Rrhziva29xypzeZM80SKc?si=14d809146ae448d0
• YouTube: https://www.youtube.com/playlist?list=PLSUh6oJ5ZotXfSaWywi-bZqNKAsfApbX1

4h9m

2 years at Twitter

I was a Staff Engineer at Twitter’s Build/Bazel Migration team. After two incredible years, November 17 was my last day (I took the voluntary separation offer and resigned, not that it matters). Twitter has been a special place to work for, for its culture of excellence, diversity, and outpouring of care for all the people that made Flock the Flock. I am grateful that I got the opportunity to experience that firsthand, and be part of it.

Here’s a quick retrospective on my last two years. Info available here are based on publicly available talks and data. Just from our team 10+ members left Twitter after the buyout, so I’ve sprinkled this post with links to their LinkedIn profiles both current and former.

sbt 1.8.0

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.8.0. This is the eighth 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.

Highlights

• Updates Coursier to 2.1.0-RC1 to address CVE-2022-37866
• Updates Ivy fork to 2.3.0-sbt-a8f9eb5bf09d0539ea3658a2c2d4e09755b5133e to address CVE-2022-37866
• Updates scala-xml to 2.x

sbt 1.8.0-RC1

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.8.0-RC1. This is the eighth 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.

Highlights

sbt 1.8.0 is a small release focused on upgrading scala-xml to 2.x. In theory this breaks the binary compatibility in the plugin ecosystem, but in practice there’s already a mixture of both 1.x and 2.x.

If you encounter a conflict in plugins, try putting the following in project/plugins.sbt:

ThisBuild / libraryDependencySchemes += "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always

sbt 1.7.3

I’m happy to announce sbt 1.7.3 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.7.3

See 1.7.0 release note for the details on 1.7.x features.

Highlights

• Updates underlying Coursier from 2.1.0-M2 to 2.1.0-M7-18-g67daad6a9 (lm-coursier-shaded 2.0.12) by @eed3si9n

sbt 1.7.2

I’m happy to announce sbt 1.7.2 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.7.2

See 1.7.0 release note for the details on 1.7.x features.

Highlights

• Fixes invalidation of incremental testQuick task #6903 by @gontard
• Updates sbt new by default to use Giter8 0.15.0
• Updates launcher to support Scala 3 apps #7035 by @eed3si9n
• Adds diagnosticCode and diagnosticRelatedInforamation (sic) to InterfaceUtil.problem(...) #7006 by @ckipp01
• Forwards diagnosticCode to BSP #6998 by @ckipp01

2022.09 mixtape

• Spotify: https://open.spotify.com/playlist/0C5LhI2qb9bh1eApj4Jxq4?si=02ab0478b8c642eb
• YouTube: https://www.youtube.com/playlist?list=PLSUh6oJ5ZotWeHtZ6AJT-ZqJtbmR877vl

4h2m

sbt 1.7.1

I’m happy to announce sbt 1.7.1 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.7.1

See 1.7.0 release note for the details on 1.7.x features.

Highlights

• Fixes Java incremental compilation, specifically parsing of annotations in class files of @SethTisue in zinc#1111

sbt 1.7.0

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.7.0. This is the seventh 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.

How to upgrade

Download the official sbt runner from cs setup, SDKMAN, or download from https://github.com/sbt/sbt/releases/tag/v1.7.0.

The sbt version used for your build is upgraded by putting the following in project/build.properties:

sbt.version=1.7.0

This mechanism allows that sbt 1.7.0 is used only for the builds that you want.

scopt 4.1.0

scopt 4.1.0 is released. To try new scopt 4.1.0:

libraryDependencies += "com.github.scopt" %% "scopt" % "4.1.0"

scopt 4.1.0 is cross published to the following build matrix:

scopt is a little command line options parsing library. See https://eed3si9n.com/scopt4 or readme for the details on how to use scopt.

2022.06 mixtape

• Spotify: https://open.spotify.com/playlist/1k4KYcV3dQO2BbGFPc4JNP?si=b94ba11e72b2420e
• YouTube: https://www.youtube.com/playlist?list=PLSUh6oJ5ZotWwWDuFf_ZvzjnD0XGEloER

3h53m

Eval 0.1.0

I released Eval 0.1.0. Eval evaluates Scala 3 code. It’s a Scala 3 port of Eval class used in sbt.

package example

import com.eed3si9n.eval.Eval
import com.eed3si9n.eval.EvalReporter
import java.nio.file.Paths

@main def main(): Unit =
  val eval = Eval(
    backingDir = Paths.get("/tmp/classes"),
    mkReporter = () => EvalReporter.store
  )
  val result = eval.evalInfer("2")
  println(result.tpe)
  println(result.getValue(this.getClass.getClassLoader))

The above prints:

Int
2

house problems (2022.03 mixtape)

• Spotify: https://open.spotify.com/playlist/5b9yqYmU4IoiCnODOBDbX7?si=4416b9b2d22b40e8
• YouTube: https://www.youtube.com/playlist?list=PLSUh6oJ5ZotV6XMYZ-01gisnkdYV5SGfa

Jar Jar Abrams 1.8.1 and sbt-assembly 1.2.0

Jar Jar Abrams 1.8.1 and sbt-assembly 1.2.0 are released.

Jar Jar Abrams is an experimental extension to Jar Jar Links, intended to shade Scala libraries.

simplifying sbt with common settings

sbt is simple, in a sense that it has a few concepts like settings and tasks, and it achieves a wide variety of things. An idea popped into my head today that could simplify sbt further. I don’t have an implementation on this yet.

sbt 1.6.2

I’m happy to announce sbt 1.6.2 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.6.2

See 1.6.0 release note for the details on 1.6.x features.

Highlights

• sbt 1.6.2 adds License object with predefined licenses.
• Fixes test framework loading failure not failing the build #6806 by @eed3si9n

granularity of testing

In the context of sbt, Bazel, and likely many other build tools, the term test could encompass various levels, and it’s useful to disamgibuate this, especially when we want to configure pre- and post-hooks and parallel execution. In other words, what do we mean when we say “test”?

There are four levels to test:

1. test command
2. test modules
3. test class
4. test method/expression

test as commandline interface

The top-most level is the test command that the build tools provide to the users.

sbt 1.6.1

I’m happy to announce sbt 1.6.1 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.6.1

See 1.6.0 release note for the details on 1.6.x features.

Highlights

• sbt 1.6.1 updates log4j 2 to 2.17.1, which fixes a remote code execution vulnerability when attacker controls configuration (CVE-2021-44832) #6765 by @eed3si9n

sbt 1.6.0

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.6.0. This is the sixth 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 1.6.0 are:

• Improved JDK 17 support
• BSP improvements
• Zinc improvements
• Remote caching improvements
• Tab completion of global keys

sbt 1.5.8

I’m happy to announce sbt 1.5.8 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.5.8

Highlights

• Updates log4j 2 to 2.17.0, which fixes a denial of service vulnerability caused by infinite recursion (CVE-2021-45105) #6755 by @augi

sbt 1.6.0-RC2

Hi everyone. On behalf of the sbt project, I am happy to announce sbt 1.6.0-RC2. This is the sixth 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.

• If no serious issues are found by Saturday, December 25th 2021, 1.6.0-RC2 will become 1.6.0 final.
• If no serious issues are found by Saturday, December 11th 2021, 1.6.0-RC1 will become 1.6.0 final.

The headline features of sbt 1.6.0 are:

• Improved JDK 17 support
• BSP improvements
• Zinc improvements
• Remote caching improvements
• Tab completion of global keys

sbt 1.5.7

I’m happy to announce sbt 1.5.7 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.5.7

Highlights

• Updates log4j 2 to 2.16.0, which disables JNDI lookup and fixes a denial of service vulnerability (CVE-2021-45046) #6749 by @augi

sbt 1.5.6

I’m happy to announce sbt 1.5.6 patch release is available. Full release note is here - https://github.com/sbt/sbt/releases/tag/v1.5.6

Highlights

• Updates log4j 2 to 2.15.0, which fixes remote code execution vulnerability (CVE-2021-44228) #6743 by @eed3si9n

2021.12 mixtape

• Spotify: https://open.spotify.com/playlist/2IEYskg1Z5FQjJt9K1oIbu?si=9cd90e576cee4071
• YouTube: https://www.youtube.com/playlist?list=PLSUh6oJ5ZotVYkGGFGU8Gj5h9vIRh-gI-

sudori part 3

I’m hacking on a small project called sudori, an experimental sbt. The initial goal is to port the macro to Scala 3. It’s an exercise to take the macro apart and see if we can build it from the ground up. This an advanced area of Scala 2 and 3, and I’m finding my way around by trial and error. This is part 3.

It’s been a while since I wrote part 2, but in between I’ve written intro to Scala 3 macros, which is sort of a sudori prequel.

Starlark 4.2.1

Starlark is a dialect of Python, originally designed as a configuration language for the Bazel build tool. Currently there are implementations in Go, Java, and Rust. As far as I know, the main Java implementation of Starlark has only been available as Bazel’s source repo on GitHub.

Since it would be convenient to have a binary distribution, I’ve forked the repo, and published it as "com.eed3si9n.starlark" % "starlark" % "4.2.1" (com.eed3si9n.starlark:starlark:4.2.1) on Maven Central. The code is the same as Bazel 4.2.1.