Kotlin Programming Language

Welcome to Kotlin!
Kotlin is a concise multiplatform language developed by JetBrains and contributors.

Some handy links:

• Kotlin Site
• Getting Started Guide
• Try Kotlin
• Kotlin Standard Library
• Issue Tracker
• Kotlin YouTube Channel
• Forum
• Kotlin Blog
• Subscribe to Kotlin YouTube channel
• Follow Kotlin on Twitter
• Public Slack channel
• TeamCity CI build
• Kotlin Foundation

Kotlin Multiplatform capabilities

Support for multiplatform programming is one of Kotlin’s key benefits. It reduces time spent writing and maintaining the same code for different platforms while retaining the flexibility and benefits of native programming.

• Kotlin Multiplatform and Compose Multiplatform for sharing business logic and UI between Android, iOS, desktop, and web.
• Get started with Kotlin Multiplatform
• Kotlin Multiplatform Benefits
• Share code on all platforms
• Share code on similar platforms

Editing Kotlin

• Kotlin IntelliJ IDEA Plugin (source code)
• Kotlin Eclipse Plugin
• Kotlin Sublime Text Package

Build environment requirements

This repository is using Gradle toolchains feature to select and auto-provision required JDKs from Eclipse Adoptium project.

Alternatively, it is still possible to only provide required JDKs via environment variables (see gradle.properties for supported variable names). To ensure Gradle uses only JDKs from environmental variables - disable Gradle toolchain auto-detection by passing -Porg.gradle.java.installations.auto-detect=false option (or put it into $GRADLE_USER_HOME/gradle.properties).

On Windows you might need to add long paths setting to the repo:

git config core.longpaths true 

Building

The project is built with Gradle. Run Gradle to build the project and to run the tests using the following command on Unix/macOS:

./gradlew <tasks-and-options>

or the following command on Windows:

gradlew <tasks-and-options>

On the first project configuration gradle will download and setup the dependencies on:

• intellij-core is a part of command line compiler and contains only necessary APIs.
• idea-full is a full blown IntelliJ IDEA Community Edition to be used in the plugin module.

These dependencies are quite large, so depending on the quality of your internet connection you might face timeouts getting them. In this case, you can increase timeout by specifying the following command line parameters on the first run:

./gradlew -Dhttp.socketTimeout=60000 -Dhttp.connectionTimeout=60000

Important gradle tasks

• clean - clean build results
• dist - assembles the compiler distribution into dist/kotlinc/ folder
• install - build and install all public artifacts into local maven repository
• coreLibsTest - build and run stdlib, reflect and kotlin-test tests
• gradlePluginTest - build and run gradle plugin tests
• compilerTest - build and run all compiler tests

To reproduce TeamCity build use -Pteamcity=true flag. Local builds don't run proguard and have jar compression disabled by default.

OPTIONAL: Some artifacts, mainly Maven plugin ones, are built separately with Maven. Refer to libraries/ReadMe.md for details.

To build Kotlin/Native, see kotlin-native/README.md.

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