Plugin that implements Scala, sbt, Play 2, SSP and Hocon support in IntelliJ IDEA.

• To get information about how to install and use this plugin in IDEA, please use IntelliJ IDEA online help.

• If you have any question about the Scala plugin, we'd be glad to answer it in our developer community.

• If you found a bug, please report it on our issue tracker.

• If you want to contribute, please see our intro to the Scala plugin internals.

In order to take part in Scala plugin development, you need:

1. IntelliJ IDEA 2019.1 or higher with a compatible version of Scala plugin
2. JDK 11 (recommended: JetBrains JDK)

1. Clone this repository to your computer

$ git clone https://github.com/JetBrains/intellij-scala.git

2. Open IntelliJ IDEA, select File -> New -> Project from existing sources, point to the directory where Scala plugin repository is and then import it as sbt project.

3. In the next step, select JDK 11 as project JDK (create it from an installed JDK if necessary).

4. After importing is completed, to create artifacts and run configurations for IDEA project, run these commands in the sbt shell:

> ;createIDEAArtifactXml ;idea-runner/createIDEARunConfiguration

5. Select the IDEA run configuration and select the Run or Debug button to build and start a development version of IDEA with the Scala plugin.

When loading the plugin in sbt, the IntelliJ platform is downloaded to <home>/.ScalaPluginIC/sdk/<sdk version>/. When opening a platform API class you will see the option to "attach sources". Click it, navigate to the sdk directory and select sources.zip, then choose "All".

To run tests properly, the plugin needs to be packaged. On the sbt shell:

1. packagePluginCommunity
2. runFastTests

The "fast tests" can take over an hour. To get a quick feedback on project health, run the "typeInference tests"

> testOnly org.jetbrains.plugins.scala.lang.typeInference.*

The project is configured to build and run the typeInference tests with Travis CI, which you can enable in your forks. The full test suite can't currently be run because Travis doesn't allow builds to take that long.

The easiest way to try your changes is typically to launch the IDEA run configuration which is created when you set up the project as described above.

To run and distribute a modified version of the plugin in a regular IntelliJ instance, you need to package it.

1. on the sbt shell, run packagePluginZip. This will output the generated plugin zip location (typically into <project directory>/target/scala-plugin.zip).
2. In IntelliJ, open Preferences, section Plugins, choose "Install plugin from disk..." and navigate to the scala-plugin.zip
3. Restart IntelliJ