IntelliJ plugin to register a custom Kotlin scripting host

gistfile1.txt

package hydraulic.hshell.intellij

import com.intellij.notification.NotificationGroupManager
import com.intellij.notification.NotificationType
import com.intellij.openapi.diagnostic.logger
import java.io.File
import java.io.IOException
import kotlin.script.experimental.intellij.ScriptDefinitionsProvider

private val LOG = logger<HShellDefinitionProvider>()

class HShellDefinitionProvider : ScriptDefinitionsProvider {
    override val id: String
        get() = ".hshell.kts script"

    override fun getDefinitionClasses(): Iterable<String> = if (jars.isNotEmpty()) listOf("hydraulic.hshell.HShellScript") else emptyList()

    private val jars: List<String> by lazy {
        try {
            // Find the list of JARs by asking the CLI version of the scripting engine to tell us where it's installed.
            // This code assumes it's on the path i.e. the user installed it correctly.
            val cmd = ProcessBuilder().command("/bin/sh", "-l", "-c", "hshell print-classpath").start()
            val cp: List<String> = cmd.inputStream.bufferedReader().readLines().dropWhile { "cds,dynamic" in it }
            if (cmd.waitFor() != 0) {
                val errors = cmd.errorStream.bufferedReader().readLines()
                throw Exception("hshell invocation failed:\n" + errors.joinToString("\n"))
            }
            LOG.info("hshell was found successfully, classpath is:\n" + cp.joinToString("\n") { "• $it" })
            cp
        } catch (e: IOException) {
            LOG.info(e)
            NotificationGroupManager.getInstance().getNotificationGroup("Hydraulic Shell")
                .createNotification("HShell", "HShell was not found. Please check you have it installed and available on your system path.", NotificationType.ERROR)
                .notify(null)
            emptyList()
        }
    }

    override fun getDefinitionsClassPath(): Iterable<File> {
        return jars.map { File(it) }
    }

    override fun useDiscovery(): Boolean = false
}