ex) IntelliJ LSP Plugin for Terraform

FooLspServerSupportProvider.kt

package com.example.demo1

import com.intellij.execution.configurations.GeneralCommandLine
import com.intellij.openapi.project.Project
import com.intellij.openapi.vfs.VirtualFile
import com.intellij.platform.lsp.api.*

class FooLspServerSupportProvider : LspServerSupportProvider {
    override fun fileOpened(
        project: Project,
        file: VirtualFile,
        serverStarter: LspServerSupportProvider.LspServerStarter
    ) {
        if (file.extension == "tf") {
            serverStarter.ensureServerStarted(FooLspServerDescriptor(project))
        }
    }
}

private class FooLspServerDescriptor(project: Project) : ProjectWideLspServerDescriptor(project, "Foo") {
    override val lspGoToDefinitionSupport = false
    override fun isSupportedFile(file: VirtualFile) = file.extension == "tf"

    override fun createCommandLine(): GeneralCommandLine {
        val commandLine = GeneralCommandLine()
        commandLine.withExePath("terraform-ls")
        commandLine.addParameters(
            "serve",
        )
        return commandLine
    }

    override fun getLanguageId(file: VirtualFile): String {
        return "terraform"
    }
}