Scala 再入門 (環境構築)

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$ cs list
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amm
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coursier
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cs
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metals
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sbt
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sbtn
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scala
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scala-cli
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scalac
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scalafmt

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{ pkgs, ...}:
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{
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  home.packages = with pkgs; [
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    coursier
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  ];
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}

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$ cs setup

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case ${OSTYPE} in
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    darwin*)
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        export PATH="$PATH:/Users/${USER}/Library/Application Support/Coursier/bin"
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        ;;
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    *)
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        # setting for linux
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        ;;
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esac

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$ sbt new scala/scala3.g8
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SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
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SLF4J: Defaulting to no-operation (NOP) logger implementation
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SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
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A template to demonstrate a minimal Scala 3 application
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name [Scala 3 Project Template]: sample
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Template applied in /private/tmp/./sample

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tree sample
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sample
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├── README.md
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├── build.sbt
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├── project
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│   └── build.properties
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└── src
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    ├── main
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    │   └── scala
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    │       └── Main.scala
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    └── test
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        └── scala
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            └── MySuite.scala
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7 directories, 5 files

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$ cat sample/src/main/scala/Main.scala
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───────┬────────────────────────────────────────────
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       │ File: sample/src/main/scala/Main.scala
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───────┼────────────────────────────────────────────
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   1   │ @main def hello(): Unit =
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   2   │   println("Hello world!")
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   3   │   println(msg)
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   4   │
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   5   │ def msg = "I was compiled by Scala 3. :)"
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───────┴────────────────────────────────────────────

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$ cd sample
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$ sbt run
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[info] welcome to sbt 1.10.5 (Azul Systems, Inc. Java 17.0.13)
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[info] loading project definition from /private/tmp/sample/project
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[info] loading settings for project root from build.sbt ...
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[info] set current project to sample (in build file:/private/tmp/sample/)
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[info] compiling 1 Scala source to /private/tmp/sample/target/scala-3.5.2/classes ...
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[info] running hello
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Hello world!
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I was compiled by Scala 3. :)
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[success] Total time: 1 s, completed 2024/11/17 19:24:17

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(setup scala-mode
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  (:elpaca t))
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(setup sbt-mode
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  (:elpaca t)
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  (:opt sbt:program-options '("-Dsbt.supershell=false"))
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  ;; WORKAROUND: https://github.com/ensime/emacs-sbt-mode/issues/31
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  ;; allows using SPACE when in the minibuffer
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  (substitute-key-definition
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   'minibuffer-complete-word
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   'self-insert-command
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   minibuffer-local-completion-map))
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(setup lsp-metals
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  (:elpaca t))
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(setup dap-mode
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  (:elpaca t)
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  (:with-mode scala-mode
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    (:hook dap-mode
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           dap-ui-mode))
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  (dap-auto-configure-mode))

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$ cs install metals