src/Pure/Tools/scala_project.scala

switch to Scala 3;

/*  Title:      Pure/Tools/scala_project.scala
    Author:     Makarius

Manage Isabelle/Scala/Java project sources, with output to Gradle or
Maven for IntelliJ IDEA.
*/

package isabelle


object Scala_Project {
  /** build tools **/

  val java_version: String = "17"
  val scala_version: String = "3.1.3"

  abstract class Build_Tool {
    def project_root: Path
    def init_project(dir: Path, jars: List[Path]): Unit

    val java_src_dir: Path = Path.explode("src/main/java")
    val scala_src_dir: Path = Path.explode("src/main/scala")

    def detect_project(dir: Path): Boolean =
      (dir + project_root).is_file &&
      (dir + scala_src_dir).is_dir

    def package_dir(source_file: Path): Path = {
      val dir =
        package_name(source_file) match {
          case Some(name) => Path.explode(space_explode('.', name).mkString("/"))
          case None => error("Failed to guess package from " + source_file)
        }
      (if (source_file.is_java) java_src_dir else scala_src_dir) + dir
    }
  }

  def build_tools: List[Build_Tool] = List(Gradle, Maven)


  /* Gradle */

  object Gradle extends Build_Tool {
    override def toString: String = "Gradle"

    val project_settings: Path = Path.explode("settings.gradle")
    override val project_root: Path = Path.explode("build.gradle")

    private def groovy_string(s: String): String = {
      s.map(c =>
        c match {
          case '\t' | '\b' | '\n' | '\r' | '\f' | '\\' | '\'' | '"' => "\\" + c
          case _ => c.toString
        }).mkString("'", "", "'")
    }

    override def init_project(dir: Path, jars: List[Path]): Unit = {
      File.write(dir + project_settings, "rootProject.name = 'Isabelle'\n")
      File.write(dir + project_root,
"""plugins {
  id 'scala'
}

repositories {
  mavenCentral()
}

dependencies {
  implementation 'org.scala-lang:scala3-library_3:scala-library:""" + scala_version + """'
  compileOnly files(
    """ + jars.map(jar => groovy_string(File.platform_path(jar))).mkString("", ",\n    ", ")") +
"""
}
""")
    }
  }


  /* Maven */

  object Maven extends Build_Tool {
    override def toString: String = "Maven"

    override val project_root: Path = Path.explode("pom.xml")

    override def init_project(dir: Path, jars: List[Path]): Unit = {
      def dependency(jar: Path): String = {
        val name = jar.expand.drop_ext.base.implode
        val system_path = File.platform_path(jar.absolute)
      """  <dependency>
    <groupId>classpath</groupId>
    <artifactId>""" + XML.text(name) + """</artifactId>
    <version>0</version>
    <scope>system</scope>
    <systemPath>""" + XML.text(system_path) + """</systemPath>
  </dependency>"""
      }

      val project = """<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>isabelle</groupId>
  <artifactId>isabelle</artifactId>
  <version>0</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>""" + java_version + """</maven.compiler.source>
    <maven.compiler.target>""" + java_version + """</maven.compiler.target>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>net.alchim31.maven</groupId>
        <artifactId>scala-maven-plugin</artifactId>
        <version>4.5.3</version>
        <configuration>
            <scalaVersion>""" + scala_version + """</scalaVersion>
        </configuration>
        </plugin>
    </plugins>
  </build>

  <dependencies>""" + jars.map(dependency).mkString("\n", "\n", "\n") + """</dependencies>
</project>"""

      File.write(dir + project_root, project)
    }
  }


  /* plugins: modules with dynamic build */

  class Plugin(dir: Path) extends Isabelle_System.Service {
    def context(): Scala_Build.Context = Scala_Build.context(dir)
  }

  lazy val plugins: List[Plugin] = Isabelle_System.make_services(classOf[Plugin])


  /* file and directories */

  lazy val isabelle_files: (List[Path], List[Path]) = {
    val contexts = Scala_Build.component_contexts() ::: plugins.map(_.context())

    val jars1 = Path.split(Isabelle_System.getenv("ISABELLE_CLASSPATH"))
    val jars2 = contexts.flatMap(_.requirements)

    val jars =
      Library.distinct(jars1 ::: jars2).filterNot(path => contexts.exists(_.is_module(path)))

    val sources =
      (for {
        context <- contexts.iterator
        path <- context.sources.iterator
        if path.is_scala || path.is_java
      } yield path).toList

    (jars, sources)
  }

  lazy val isabelle_scala_files: Map[String, Path] = {
    val context = Scala_Build.context(Path.ISABELLE_HOME, component = true)
    context.sources.iterator.foldLeft(Map.empty[String, Path]) {
      case (map, path) =>
        if (path.is_scala) {
        val base = path.base.implode
          map.get(base) match {
            case None => map + (base -> path)
            case Some(path2) => error("Conflicting base names: " + path + " vs. " + path2)
          }
        }
        else map
    }
  }


  /* compile-time position */

  def here: Here = {
    val exn = new Exception
    exn.getStackTrace.toList match {
      case _ :: caller :: _ =>
        val name = proper_string(caller.getFileName).getOrElse("")
        val line = caller.getLineNumber
        new Here(name, line)
      case _ => new Here("", 0)
    }
  }

  class Here private[Scala_Project](name: String, line: Int) {
    override def toString: String = name + ":" + line
    def position: Position.T =
      isabelle_scala_files.get(name) match {
        case Some(path) => Position.Line_File(line, path.implode)
        case None => Position.none
      }
  }


  /* scala project */

  val default_project_dir = Path.explode("$ISABELLE_HOME_USER/scala_project")

  def package_name(source_file: Path): Option[String] = {
    val lines = Library.trim_split_lines(File.read(source_file))
    val Package = """\s*\bpackage\b\s*(?:object\b\s*)?((?:\w|\.)+)\b.*""".r
    lines.collectFirst({ case Package(name) => name })
  }

  def scala_project(
    build_tool: Build_Tool,
    project_dir: Path = default_project_dir,
    more_sources: List[Path] = Nil,
    symlinks: Boolean = false,
    force: Boolean = false,
    progress: Progress = new Progress
  ): Unit = {
    if (project_dir.file.exists) {
      val detect = project_dir.is_dir && build_tools.exists(_.detect_project(project_dir))

      if (force && detect) {
        progress.echo("Purging existing project directory: " + project_dir.absolute)
        Isabelle_System.rm_tree(project_dir)
      }
      else error("Project directory already exists: " + project_dir.absolute)
    }

    progress.echo("Creating " + build_tool + " project directory: " + project_dir.absolute)
    Isabelle_System.make_directory(project_dir)

    val java_src_dir = Isabelle_System.make_directory(project_dir + build_tool.java_src_dir)
    val scala_src_dir = Isabelle_System.make_directory(project_dir + build_tool.scala_src_dir)

    val (jars, sources) = isabelle_files
    isabelle_scala_files

    build_tool.init_project(project_dir, jars)

    for (source <- sources ::: more_sources) {
      val dir = build_tool.package_dir(source)
      val target_dir = project_dir + dir
      if (!target_dir.is_dir) {
        progress.echo("  Creating package directory: " + dir)
        Isabelle_System.make_directory(target_dir)
      }
      if (symlinks) Isabelle_System.symlink(source.absolute, target_dir, native = true)
      else Isabelle_System.copy_file(source, target_dir)
    }
  }


  /* Isabelle tool wrapper */

  val isabelle_tool =
    Isabelle_Tool("scala_project", "setup IDE project for Isabelle/Java/Scala sources",
      Scala_Project.here,
      { args =>
        var build_tool: Option[Build_Tool] = None
        var project_dir = default_project_dir
        var symlinks = false
        var force = false

        val getopts = Getopts("""
Usage: isabelle scala_project [OPTIONS] [MORE_SOURCES ...]

  Options are:
    -D DIR       project directory (default: """ + default_project_dir + """)
    -G           use Gradle as build tool
    -L           make symlinks to original source files
    -M           use Maven as build tool
    -f           force update of existing directory

  Setup project for Isabelle/Scala/jEdit --- to support common IDEs such
  as IntelliJ IDEA. Either option -G or -M is mandatory to specify the
  build tool.
""",
          "D:" -> (arg => project_dir = Path.explode(arg)),
          "G" -> (_ => build_tool = Some(Gradle)),
          "L" -> (_ => symlinks = true),
          "M" -> (_ => build_tool = Some(Maven)),
          "f" -> (_ => force = true))

        val more_args = getopts(args)

        val more_sources = more_args.map(Path.explode)
        val progress = new Console_Progress

        if (build_tool.isEmpty) {
          error("Unspecified build tool: need to provide option -G or -M")
        }

        scala_project(build_tool.get, project_dir = project_dir, more_sources = more_sources,
          symlinks = symlinks, force = force, progress = progress)
      })
}