Improve add-on UI error message

Show the paths of the duplicate addons

D791 by @gregzaal

release/scripts/modules/addon_utils.py

@@ -31,8 +31,9 @@ __all__ = (
 import bpy as _bpy
 _user_preferences = _bpy.context.user_preferences
 
-error_duplicates = False
 error_encoding = False
+# (name, file, path)
+error_duplicates = []
 addons_fake_modules = {}
 
 
@@ -57,12 +58,11 @@ def paths():
 
 
 def modules_refresh(module_cache=addons_fake_modules):
-    global error_duplicates
     global error_encoding
     import os
 
-    error_duplicates = False
     error_encoding = False
+    error_duplicates.clear()
 
     path_list = paths()
 
@@ -168,7 +168,7 @@ def modules_refresh(module_cache=addons_fake_modules):
                 if mod.__file__ != mod_path:
                     print("multiple addons with the same name:\n  %r\n  %r" %
                           (mod.__file__, mod_path))
-                    error_duplicates = True
+                    error_duplicates.append((mod.bl_info["name"], mod.__file__, mod_path))
 
                 elif mod.__time__ != os.path.getmtime(mod_path):
                     print("reloading addon:",

release/scripts/startup/bl_ui/space_userpref.py

@@ -1317,11 +1317,18 @@ class USERPREF_PT_addons(Panel):
 
         # set in addon_utils.modules_refresh()
         if addon_utils.error_duplicates:
-            self.draw_error(col,
-                            "Multiple addons using the same name found!\n"
-                            "likely a problem with the script search path.\n"
-                            "(see console for details)",
-                            )
+            box = col.box()
+            row = box.row()
+            row.label("Multiple addons with the same name found!")
+            row.label(icon='ERROR')
+            box.label("Please delete one of each pair:")
+            for (addon_name, addon_file, addon_path) in addon_utils.error_duplicates:
+                box.separator()
+                sub_col = box.column(align=True)
+                sub_col.label(addon_name + ":")
+                sub_col.label("    " + addon_file)
+                sub_col.label("    " + addon_path)
+
 
         if addon_utils.error_encoding:
             self.draw_error(col,