Kotlin support

Kotlin programming language is supported in a number of ways:

• Kotlin plugin donated by JetBrains
• Kotlin Language Server

JetBrains Kotlin plugin

Donated by JetBreains.

Original URL: https://github.com/JetBrains/kotlin-netbeans

It can be found inside contrib folder of Apache NetBeans source code:

https://github.com/JetBrains/kotlin-netbeans/issues/137

https://github.com/apache/netbeans/pull/1398

Steps to build it:

1. The pom.xml requires some dependencies that are not in the central maven repository. These are: asm-all.jar, idea-formatter.jar, intellij-core.jar, kotlin-converter.jar, kotlin-formatter.jar, kotlin-ide-common.jar, openapi-formatter.jar.  intellij-core.jar artifact can be directly taken from: https://www.jetbrains.com/intellij-repository/releases. The other artifacts can be found at https://github.com/JetBrains/kotlin-eclipse project inside the kotlin-bundled-compiler folder. Once you have collected all these libraries, create a lib folder inside kotlin-netbeans project and paste them inside there.
2. In NetBeans, click on Tools → Plugins → Settings tab and add a new plugin Portal: Name: NetBeans 8.2 Plugin Portal, URL: http://updates.netbeans.org/netbeans/updates/8.2/uc/final/distribution/catalog.xml.gz. Make it active.

Once you build the project, all Java and NetBeans dependencies should be resolved. However, the project also contains a lot of Kotlin code which throws a lot of compilation errors. The plugin contains Kotlin code that needs to be built/migrated to the latest Kotlin compiler version and all the compilation errors need to be fixed.

Sidenote: There are also contrib/groovy.grails and contrib/groovy.grailsproject.

Kotlin LSP

NetBeans 12.x and later already provide some basic support in the java/kotlin.editor module. With this plugin one can open a .kt file via the Windows→Favourites tab.

Syntax highlighting of .kt source files are provided using the Kotlin.tmLanguage.json TextMate syntax. This JavaDoc explains how to integrate a TextMate lexer with NetBeans.

Code completion, navigation etc. are provided by the Kotlin Language Server project. To use the Kotlin Language server:

1. Download and build Kotlin Language Server with JDK 11 using the command: ./gradlew :server:installDist (how can we add kotlin-language-server/server/build/install/server/bin/kotlin-language-server)
2. Open netbeans/java/kotlin.editor module in NetBeans IDE
3. Add a new class:

package org.netbeans.modules.kotlin.editor.lsp;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.netbeans.api.editor.mimelookup.MimeRegistration;
import org.netbeans.modules.lsp.client.spi.LanguageServerProvider;
import org.openide.util.Lookup;

@MimeRegistration(mimeType="text/x-kotlin", service=LanguageServerProvider.class)
public class KotlinLSPServer implements LanguageServerProvider {

    private static final Logger LOG = Logger.getLogger(KotlinLSPServer.class.getName());

    @Override
    public LanguageServerDescription startServer(Lookup lookup) {
        File server = new File("<path_to_>/kotlin-language-server/server/build/install/server/bin/kotlin-language-server");
        //InstalledFileLocator.getDefault().locate("typescript-lsp/node_modules/typescript-language-server/lib/cli.js", null, false);
        try {
            Process p = new ProcessBuilder(new String[] {server.getAbsolutePath()}).directory(server.getParentFile().getParentFile()).redirectError(ProcessBuilder.Redirect.INHERIT).start();
            return LanguageServerDescription.create(p.getInputStream(), p.getOutputStream(), p);
        } catch (IOException ex) {
            LOG.log(Level.FINE, null, ex);
            return null;
        }
    }
}