build Isabelle component for Go: all platforms;

--- a/etc/build.props	Sun Mar 24 15:13:35 2024 +0100
+++ b/etc/build.props	Sun Mar 24 17:49:53 2024 +0100
@@ -26,6 +26,7 @@
   src/Pure/Admin/component_eptcs.scala \
   src/Pure/Admin/component_foiltex.scala \
   src/Pure/Admin/component_fonts.scala \
+  src/Pure/Admin/component_go.scala \
   src/Pure/Admin/component_hugo.scala \
   src/Pure/Admin/component_javamail.scala \
   src/Pure/Admin/component_jdk.scala \

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Admin/component_go.scala	Sun Mar 24 17:49:53 2024 +0100
@@ -0,0 +1,139 @@
+/*  Title:      Pure/Admin/component_go.scala
+    Author:     Makarius
+
+Build Isabelle component for Go: https://go.dev
+*/
+
+package isabelle
+
+
+object Component_Go {
+  /* platform information */
+
+  sealed case class Download_Platform(platform_name: String, download_name: String) {
+    def download(base_url: String, version: String): String =
+      Url.append_path(base_url, "go" + version + "." + download_name)
+  }
+
+  val platforms: List[Download_Platform] =
+    List(
+      Download_Platform("arm64-darwin", "darwin-arm64.tar.gz"),
+      Download_Platform("arm64-linux", "linux-arm64.tar.gz"),
+      Download_Platform("x86_64-darwin", "darwin-amd64.tar.gz"),
+      Download_Platform("x86_64-linux", "linux-amd64.tar.gz"),
+      Download_Platform("x86_64-windows", "windows-amd64.zip"))
+
+
+  /* build go */
+
+  val default_url = "https://go.dev/dl"
+  val default_version = "1.22.1"
+
+  def build_go(
+    base_url: String = default_url,
+    version: String = default_version,
+    target_dir: Path = Path.current,
+    progress: Progress = new Progress
+  ): Unit = {
+    val component_dir =
+      Components.Directory(target_dir + Path.basic("go-" + version)).create(progress = progress)
+
+
+    /* download */
+
+    Isabelle_System.with_tmp_dir("download") { download_dir =>
+      for (platform <- platforms.reverse) {
+        val download = platform.download(base_url, version)
+
+        val archive_name =
+          Url.get_base_name(download) getOrElse
+            error("Malformed download URL " + quote(download))
+        val archive_path = download_dir + Path.basic(archive_name)
+
+        Isabelle_System.download_file(download, archive_path, progress = progress)
+        Isabelle_System.extract(archive_path, component_dir.path, strip = true)
+
+        val platform_dir = component_dir.path + Path.explode(platform.platform_name)
+        Isabelle_System.move_file(component_dir.bin, platform_dir)
+      }
+    }
+
+    File.find_files(component_dir.path.file, pred = file => File.is_exe(file.getName)).
+      foreach(file => File.set_executable(File.path(file)))
+
+
+    /* isabelle tool */
+
+    val isabelle_tool_dir = component_dir.path + Path.explode("isabelle_tool")
+    Isabelle_System.make_directory(isabelle_tool_dir)
+
+    for (tool <- List("go", "gofmt")) {
+      val isabelle_tool = isabelle_tool_dir + Path.basic(tool)
+      File.write(isabelle_tool,
+"""#!/usr/bin/env bash
+#
+# Author: Makarius
+#
+# DESCRIPTION: invoke """ + tool + """ within the Isabelle environment
+
+export GOROOT="$ISABELLE_GOROOT"
+exec "$ISABELLE_GOEXE/""" + tool + """" "$@"
+""")
+      File.set_executable(isabelle_tool)
+    }
+
+
+    /* settings */
+
+    component_dir.write_settings("""
+ISABELLE_GOROOT="$COMPONENT"
+ISABELLE_GOEXE="$ISABELLE_GOROOT/${ISABELLE_WINDOWS_PLATFORM64:-${ISABELLE_APPLE_PLATFORM64:-$ISABELLE_PLATFORM64}}"
+
+ISABELLE_TOOLS="$ISABELLE_TOOLS:$ISABELLE_GOROOT/isabelle_tool"
+""")
+
+
+    /* README */
+
+    File.write(component_dir.README,
+      """This distribution of Go has been assembled from official downloads from
+""" + base_url + """
+
+
+        Makarius
+        """ + Date.Format.date(Date.now()) + "\n")
+  }
+
+
+  /* Isabelle tool wrapper */
+
+  val isabelle_tool =
+    Isabelle_Tool("component_go", "build component for Go", Scala_Project.here,
+      { args =>
+        var target_dir = Path.current
+        var base_url = default_url
+        var version = default_version
+
+        val getopts = Getopts("""
+Usage: isabelle component_go [OPTIONS]
+
+  Options are:
+    -D DIR       target directory (default ".")
+    -U URL       download URL (default: """" + default_url + """")
+    -V VERSION   version (default: """" + default_version + """")
+
+  Build component for Go development environment.
+""",
+          "D:" -> (arg => target_dir = Path.explode(arg)),
+          "U:" -> (arg => base_url = arg),
+          "V:" -> (arg => version = arg))
+
+        val more_args = getopts(args)
+        if (more_args.nonEmpty) getopts.usage()
+
+        val progress = new Console_Progress()
+
+        build_go(base_url = base_url, version = version, target_dir = target_dir,
+          progress = progress)
+      })
+}

--- a/src/Pure/System/components.scala	Sun Mar 24 15:13:35 2024 +0100
+++ b/src/Pure/System/components.scala	Sun Mar 24 17:49:53 2024 +0100
@@ -206,6 +206,7 @@
 
     def etc: Path = path + Path.basic("etc")
     def src: Path = path + Path.basic("src")
+    def bin: Path = path + Path.basic("bin")
     def lib: Path = path + Path.basic("lib")
     def settings: Path = etc + Path.basic("settings")
     def components: Path = etc + Path.basic("components")

--- a/src/Pure/System/isabelle_tool.scala	Sun Mar 24 15:13:35 2024 +0100
+++ b/src/Pure/System/isabelle_tool.scala	Sun Mar 24 17:49:53 2024 +0100
@@ -174,6 +174,7 @@
   Component_Easychair.isabelle_tool,
   Component_Foiltex.isabelle_tool,
   Component_Fonts.isabelle_tool,
+  Component_Go.isabelle_tool,
   Component_Hugo.isabelle_tool,
   Component_Javamail.isabelle_tool,
   Component_JDK.isabelle_tool,