more robust and uniform Other_Isabelle.scala_build;

--- a/src/Pure/Admin/build_history.scala	Tue Jan 24 15:00:01 2023 +0100
+++ b/src/Pure/Admin/build_history.scala	Tue Jan 24 15:16:24 2023 +0100
@@ -207,13 +207,7 @@
 
       if (first_build) {
         other_isabelle.resolve_components(echo = verbose)
-
-        if (fresh) {
-          Isabelle_System.rm_tree(other_isabelle.isabelle_home + Path.explode("lib/classes"))
-        }
-        other_isabelle.bash(
-          "env PATH=\"" + File.bash_path(Path.explode("~~/lib/dummy_stty")) + ":$PATH\" " +
-            "bin/isabelle jedit -b", redirect = true, echo = verbose).check
+        other_isabelle.scala_build(fresh = fresh, echo = verbose)
 
         for {
           tool <- List("ghc_setup", "ocaml_setup")

--- a/src/Pure/Admin/build_release.scala	Tue Jan 24 15:00:01 2023 +0100
+++ b/src/Pure/Admin/build_release.scala	Tue Jan 24 15:16:24 2023 +0100
@@ -470,12 +470,7 @@
         other_isabelle.init_components(components_base = context.components_base))
       other_isabelle.resolve_components(echo = true)
 
-      try {
-        other_isabelle.bash(
-          "export CLASSPATH=" + Bash.string(other_isabelle.getenv("ISABELLE_CLASSPATH")) + "\n" +
-          "bin/isabelle jedit -b", echo = true).check
-      }
-      catch { case ERROR(msg) => cat_error("Failed to build Isabelle/Scala/Java modules:", msg) }
+      other_isabelle.scala_build(echo = true)
 
       try {
         other_isabelle.bash(

--- a/src/Pure/Admin/other_isabelle.scala	Tue Jan 24 15:00:01 2023 +0100
+++ b/src/Pure/Admin/other_isabelle.scala	Tue Jan 24 15:16:24 2023 +0100
@@ -62,6 +62,19 @@
     }
   }
 
+  def scala_build(fresh: Boolean = false, echo: Boolean = false): Unit = {
+    if (fresh) {
+      Isabelle_System.rm_tree(isabelle_home + Path.explode("lib/classes"))
+    }
+    try {
+      bash(
+        "export PATH=\"" + File.bash_path(Path.explode("~~/lib/dummy_stty")) + ":$PATH\"\n" +
+        "export CLASSPATH=" + Bash.string(getenv("ISABELLE_CLASSPATH")) + "\n" +
+        "bin/isabelle jedit -b", echo = echo).check
+    }
+    catch { case ERROR(msg) => cat_error("Failed to build Isabelle/Scala/Java modules:", msg) }
+  }
+
 
   /* components */