App.__get_project_refs(): Code beautification

In __get_project_refs():
  - Rename variable dep and deps to val and vals, respectively,
    because that's more what they are values of key-value pairs. In
    some cases that can represent dependencies, in some case other
    things.
  - Make a scope case distinction a little clearer by mentioning all
    possible cases in a match / case block
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/App.py

@@ -188,27 +188,28 @@ class App(Base):
                 buf.append(spec)
             return
         visited.add(spec)
-        deps = self.get_value(name, section, key)
+        vals = self.get_value(name, section, key)
         log(
             DEBUG,
             (
-                f'name={name}, section={section}, key={key}, deps={deps}, '
+                f'name={name}, section={section}, key={key}, deps={vals}, '
                 f'scope={scope.name}, visited={visited}'
             ),
         )
-        if deps and scope != Scope.Self:
+        vals_list = vals.split(',') if vals else []
-            if scope == Scope.One:
+        match scope:
-                subscope = Scope.Self
+            case Scope.Self:
-            else:
+                buf += vals_list
-                subscope = Scope.Subtree
+            case Scope.One | Scope.Subtree:
-            for dep in deps.split(','):
+                subscope = scope.Self if scope == Scope.One else scope
-                dep = dep.strip()
+                for val in vals_list:
-                if not (len(dep)):
+                    val = val.strip()
+                    if not (len(val)):
                         continue
                     self.__get_project_refs_cached(
                         buf,
                         visited,
-                    dep,
+                        val,
                         section,
                         key,
                         add_self = True,