clarified modules;

--- a/src/Tools/VSCode/src/build_vscode_extension.scala	Tue Mar 22 19:19:09 2022 +0100
+++ b/src/Tools/VSCode/src/build_vscode_extension.scala	Tue Mar 22 19:33:38 2022 +0100
@@ -139,20 +139,6 @@
 
   lazy val extension_dir = Path.explode("$ISABELLE_VSCODE_HOME/extension")
 
-  def uninstall_extension(progress: Progress = new Progress): Unit =
-    VSCode_Main.run_vscodium(
-      List("--uninstall-extension", "Isabelle.isabelle"), progress = progress).check
-
-  def install_extension(vsix: File.Content, progress: Progress = new Progress): Unit =
-  {
-    Isabelle_System.with_tmp_dir("tmp")(tmp_dir =>
-    {
-      vsix.write(tmp_dir)
-      VSCode_Main.run_vscodium(
-        List("--install-extension", File.platform_path(tmp_dir + vsix.path)), progress = progress).check
-    })
-  }
-
   def build_extension(options: Options,
     logic: String = default_logic,
     dirs: List[Path] = Nil,
@@ -219,11 +205,11 @@
       val options = Options.init()
       val progress = new Console_Progress()
 
-      if (uninstall) uninstall_extension(progress = progress)
+      if (uninstall) VSCode_Main.uninstall_extension(progress = progress)
       else {
         val vsix = build_extension(options, logic = logic, dirs = dirs, progress = progress)
         vsix.write(extension_dir)
-        if (install) install_extension(vsix, progress = progress)
+        if (install) VSCode_Main.install_extension(vsix, progress = progress)
       }
     })
 }

--- a/src/Tools/VSCode/src/vscode_main.scala	Tue Mar 22 19:19:09 2022 +0100
+++ b/src/Tools/VSCode/src/vscode_main.scala	Tue Mar 22 19:33:38 2022 +0100
@@ -71,6 +71,22 @@
   }
 
 
+  /* extensions */
+
+  def uninstall_extension(progress: Progress = new Progress): Unit =
+    run_vscodium(List("--uninstall-extension", "Isabelle.isabelle"), progress = progress).check
+
+  def install_extension(vsix: File.Content, progress: Progress = new Progress): Unit =
+  {
+    Isabelle_System.with_tmp_dir("tmp")(tmp_dir =>
+    {
+      vsix.write(tmp_dir)
+      run_vscodium(List("--install-extension", File.platform_path(tmp_dir + vsix.path)),
+        progress = progress).check
+    })
+  }
+
+
   /* settings */
 
   def settings_path: Path =