add component build tool for hugo from afp-devel;

--- a/etc/build.props	Tue Oct 10 11:20:57 2023 +0200
+++ b/etc/build.props	Tue Oct 10 12:57:01 2023 +0200
@@ -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_hugo.scala \
   src/Pure/Admin/component_jdk.scala \
   src/Pure/Admin/component_jedit.scala \
   src/Pure/Admin/component_jsoup.scala \

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Admin/component_hugo.scala	Tue Oct 10 12:57:01 2023 +0200
@@ -0,0 +1,123 @@
+/*  Title:      Pure/Admin/component_hugo.scala
+    Author:     Fabian Huch, TU Muenchen
+
+Build Isabelle component for hugo site generator. See also:
+
+  - https://gohugo.io
+  - https://github.com/gohugoio/hugo
+*/
+
+package isabelle
+
+
+object Component_Hugo {
+  /* platform information */
+
+  sealed case class Download_Platform(platform_name: String, url_template: String) {
+    override def toString: String = platform_name
+
+    def is_windows: Boolean = url_template.contains("windows")
+    def url(base_url: String, version: String): String =
+      base_url + "/v" + version + "/" + url_template.replace("{V}", version)
+  }
+
+  val platforms: List[Download_Platform] =
+    List(
+      Download_Platform("arm64-darwin", "hugo_extended_{V}_darwin-universal.tar.gz"),
+      Download_Platform("arm64-linux", "hugo_extended_{V}_linux-arm64.tar.gz"),
+      Download_Platform("x86_64-darwin", "hugo_extended_{V}_darwin-universal.tar.gz"),
+      Download_Platform("x86_64-linux", "hugo_extended_{V}_linux-amd64.tar.gz"),
+      Download_Platform("x86_64-windows", "hugo_extended_{V}_windows-amd64.zip"))
+
+
+  /* build hugo */
+
+  val default_url = "https://github.com/gohugoio/hugo/releases/download"
+  val default_version = "0.119.0"
+
+  def build_hugo(
+    base_url: String = default_url,
+    version: String = default_version,
+    target_dir: Path = Path.current,
+    progress: Progress = new Progress
+  ): Unit = {
+    /* component */
+
+    val component = "hugo-" + version
+    val component_dir =
+      Components.Directory(target_dir + Path.basic(component)).create(progress = progress)
+
+
+    /* download */
+
+    for (platform <- platforms) {
+      val platform_dir =
+        Isabelle_System.make_directory(component_dir.path + Path.basic(platform.platform_name))
+
+      val url = platform.url(base_url, version)
+      val name = Library.take_suffix(_ != '/', url.toList)._2.mkString
+
+      val exe = Path.basic("hugo").exe_if(platform.is_windows)
+
+      Isabelle_System.with_tmp_dir("download", component_dir.path.file) { download_dir =>
+        Isabelle_System.with_tmp_dir("tmp", component_dir.path.file) { tmp_dir =>
+          val archive_file = download_dir + Path.basic(name)
+
+          Isabelle_System.download_file(url, archive_file, progress = progress)
+          Isabelle_System.extract(archive_file, tmp_dir)
+          Isabelle_System.move_file(tmp_dir + exe, platform_dir)
+          Isabelle_System.move_file(tmp_dir + Path.basic("LICENSE"), component_dir.LICENSE)
+          File.set_executable(platform_dir + exe)
+        }
+      }
+    }
+
+
+    /* settings */
+
+    component_dir.write_settings("""
+ISABELLE_HUGO="$COMPONENT/${ISABELLE_WINDOWS_PLATFORM64:-${ISABELLE_APPLE_PLATFORM64:-$ISABELLE_PLATFORM64}}"
+""")
+
+
+    /* README */
+
+    File.write(component_dir.README,
+      """This Isabelle components provides a hugo extended """ + version + """.
+
+See also https://gohugo.io and executables from """ + base_url + """
+
+        Fabian
+        """ + Date.Format.date(Date.now()) + "\n")
+  }
+
+  val isabelle_tool =
+    Isabelle_Tool("component_hugo", "build hugo component", Scala_Project.here,
+      { args =>
+        var target_dir = Path.current
+        var base_url = default_url
+        var version = default_version
+
+        val getopts = Getopts("""
+Usage: isabelle component_hugo [OPTIONS]
+
+  Options are:
+    -D DIR       target directory (default ".")
+    -U URL       download URL (default: """" + default_url + """")
+    -V VERSION   version (default: """" + default_version + """")
+
+  Build extended hugo component.
+""",
+          "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_hugo(base_url = base_url, version = version, target_dir = target_dir,
+          progress = progress)
+    })
+}

--- a/src/Pure/System/isabelle_tool.scala	Tue Oct 10 11:20:57 2023 +0200
+++ b/src/Pure/System/isabelle_tool.scala	Tue Oct 10 12:57:01 2023 +0200
@@ -170,6 +170,7 @@
   Component_Easychair.isabelle_tool,
   Component_Foiltex.isabelle_tool,
   Component_Fonts.isabelle_tool,
+  Component_Hugo.isabelle_tool,
   Component_JDK.isabelle_tool,
   Component_JEdit.isabelle_tool,
   Component_Jsoup.isabelle_tool,