[core] Tweak submitters registration to allow submitters from external plugins

Author: Alxiice

meshroom/core/__init__.py

@@ -380,14 +380,24 @@ def registerSubmitter(s: BaseSubmitter):
     submitters[s.name] = s
 
 
-def loadSubmitters(folder, packageName):
+def loadSubmitters(folder, packageName) -> list[BaseSubmitter]:
     if not os.path.isdir(folder):
         logging.error(f"Submitters folder '{folder}' does not exist.")
         return
 
     return loadClassesSubmitters(folder, packageName)
 
 
+def loadAllSubmitters(folder) -> list[BaseSubmitter]:
+    submitters = []
+    for _, package, ispkg in pkgutil.iter_modules([folder]):
+        if ispkg:
+            subs = loadSubmitters(folder, package)
+            if subs:
+                submitters.extend(subs)
+    return submitters
+
+
 def loadPipelineTemplates(folder: str):
     if not os.path.isdir(folder):
         logging.error(f"Pipeline templates folder '{folder}' does not exist.")
@@ -408,10 +418,20 @@ def initNodes():
 
 
 def initSubmitters():
+    """ Detect and register submitter plugins
+    Note: Make sure the package name (folder inside the additionalPaths folders)
+          are unique : so we cannot name them "submitters" because it's already taken
+          by the submitters package inside meshroom
+    """
+    # Load meshroom default submitters
+    # Use directly loadSubmitters because we don't want any folder except submitters to be registered
+    subs = loadSubmitters(meshroomFolder, "submitters")
+    for sub in subs:
+        registerSubmitter(sub())
+    # Load additional submitters
     additionalPaths = EnvVar.getList(EnvVar.MESHROOM_SUBMITTERS_PATH)
-    allSubmittersFolders = [meshroomFolder] + additionalPaths
-    for folder in allSubmittersFolders:
-        subs = loadSubmitters(folder, "submitters")
+    for folder in additionalPaths:
+        subs = loadAllSubmitters(folder)
         for sub in subs:
             registerSubmitter(sub())