My name is Olaf and I am a software engineer living in Oslo, Norway. I like working on projects related to Scala, the JVM, compilers, build tools and IDEs. My email is hello@geirsson.com. I'm @olafurpg on GitHub and Twitter.

Projects:

• scalafmt: code formatter
• scalafix: refactoring and linting tool
• scalameta: library to analyze source code
• metals: language server with rich IDE features
• metabrowse: online code browser with IDE features
• mdoc: markdown tool for typechecked documentation
• munit: testing library
• metaconfig: configuration library
• sbt-ci-release: plugin to automate releases for open source projects
• sbt-native-image: plugin to generate GraalVM native-image binaries.
• build-server-protocol: protocol for IDEs and build tools
• setup-scala: GitHub action to install custom JDK versions

Downloads:

As of April 2023, projects that I've worked on get ~18m downloads per month from ~300k unique IP addresses.

Presentations:

• 2019 Scale by the Bay Building rich IDE features beyond the Language Server Protocol
• 2019 ScalaDays Lausanne Rich code editing for Scala in VS Code, Vim, Emacs and beyond
• 2018 ScalaDays Berlin Six steps from zero to IDE
• 2018 ScalaSphere SemanticDB for Scala developer tools
• 2017 flatMap(Oslo) Move fast and refactor with Scalafix
• 2016 flatMap(Oslo) Scalafmt - opinionated code formatter for Scala

Posts:

• Jan 2021. Building precise universal code search at Sourcegraph
• Dec 2020. Becoming a software consultant in Oslo, Norway
• Mar 2020. Dos and don'ts in open source
• Feb 2020. MUnit is a new Scala testing library
• Dec 2019. Scala tooling in 2019
• Mar 2019. Joining Twitter
• Jan 2019. Low-memory symbol indexing with bloom filters
• Dec 2018. Fast typechecked markdown documentation with clear error messages
• Dec 2018. Fast goto definition with low memory footprint
• Nov 2018. Build code analyzers with Scalameta and Scalafix
• Mar 2018. Features I want in an IDE
• Nov 2017. What's happening with macros?
• Oct 2017. Roadmap towards non-experimental macros
• Sep 2017. Catch bugs with Scalafix v0.5
• Feb 2017. Refactor with Scalafix v0.3
• Oct 2016. Introducing Scalafix: a code migration tool for Scala
• Oct 2016. Scalameta at Scala World
• Jun 2016. Master's thesis done
• May 2016. Scalafmt at flatMap(Olso)
• Feb 2016. Three cool things you can do with Scalameta
• Nov 2015. Slick codegen and Scala.js
• Oct 2015. Authorization with Autowire
• Jun 2015. Directembedding: Concealing the Deep Embedding of DSLs
• Sep 2014. Launaskil: payroll managment for independent contractors
• Jun 2014. Orðspor: labeling named entities with computer games
• Dec 2013. Buddy AutoMagic - using network flow to connect students
• Sep 2013. IceQC - Question Classification for the Icelandic language
• Sep 2013. IceQA - Question Answering for the Icelandic language
• Apr 2013. Permutation pattern avoidance