Read complevel from the lump in the wad, if it exists.

dcc/configure.py

@@ -1,11 +1,12 @@
 import dcc.doom_base
+import omg
 import tomlkit.toml_file
 
 
 class Configure(dcc.doom_base.Wad):
     def get_parser(self, prog_name):
         parser = super().get_parser(prog_name)
-        parser.add_argument("complevel")
+        parser.add_argument("--complevel", "--cl")
         parser.add_argument("--iwad")
         return parser
 
@@ -14,8 +15,26 @@ class Configure(dcc.doom_base.Wad):
         if new_config.exists():
             raise Exception(f"Config {new_config} already exists.")
 
+        wads = sorted(
+            self.pwads.joinpath(self.wad).glob('*.wad', case_sensitive=False),
+            reverse=True
+        )
+
+        complevel = parsed_args.complevel
+        if complevel is None:
+            for w in wads:
+                try:
+                    wad = omg.WadIO(w)
+                    complevel = wad.read("COMPLVL").decode("ascii").strip()
+                except Exception as e:
+                    print(
+                        f"Wad {w} likely has no lump COMPLVL (exception {e})")
+        if complevel is None:
+            complevel = input("Complevel? ")
+
+            
         doc = tomlkit.document()
-        doc.add("complevel", parsed_args.complevel)
+        doc.add("complevel", complevel)
         if parsed_args.iwad is not None:
             doc.add("iwad", parsed_args.iwad)