com.spotify.scio.repl.ScioGenericRunner.scala Maven / Gradle / Ivy

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/*
 * Copyright 2020 Spotify AB.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.spotify.scio.repl

import scala.tools.nsc.{GenericRunnerCommand, MainGenericRunner}

trait ScioGenericRunner extends MainGenericRunner {

  /**
   * The main entry point for executing the REPL.
   *
   * This method is lifted from [[scala.tools.nsc.MainGenericRunner]] and modified to allow for
   * custom functionality, including determining at runtime if the REPL is running, and making
   * custom REPL colon-commands available to the user.
   *
   * @param args
   *   passed from the command line
   * @return
   *   `true` if execution was successful, `false` otherwise
   */
  override def process(args: Array[String]): Boolean = {
    val command = new GenericRunnerCommand(args.toList, _ => ())

    val fromSbt = Thread.currentThread.getStackTrace.exists { elem =>
      elem.getClassName.startsWith("sbt.Run")
    }
    command.settings.usejavacp.value = !fromSbt

    ScioReplClassLoader
      .classLoaderURLs(Thread.currentThread.getContextClassLoader)
      .map(_.getPath)
      .foreach(command.settings.classpath.append)

    val scioClassLoader = ScioReplClassLoader(command.settings.classpathURLs.toArray)
    val repl = new ScioILoop(command, args.toList)

    command.settings.Yreploutdir.value = ""
    command.settings.YmacroAnnotations.value = true

    // Set classloader chain - expose top level abstract class loader down
    // the chain to allow for readObject and latestUserDefinedLoader
    // See https://gist.github.com/harrah/404272
    command.settings.embeddedDefaults(scioClassLoader)

    repl.run(command.settings)
  }
}