feature: Implement basic optional dependency resolution.

armarx_setup/core/module_graph.py

@@ -38,7 +38,7 @@ class ModuleGraph(nx.DiGraph):
         if module.name not in self:
             self.add_node(module.name, module=module)
 
-        # Add dependencies.
+        # Add required dependencies.
         for required_name in module.required_modules:
             if required_name not in self:
                 required_module = Module.load_info(required_name, ws=ws)
@@ -50,6 +50,12 @@ class ModuleGraph(nx.DiGraph):
             required_module = self.nodes[required_name]["module"]
             self.add_module(required_module, ws=module.ws)
 
+        # Add optional dependencies.
+        for optional_name in module.optional_modules:
+            # If the optional dependency is already in the graph, it is a manually set dependency and thus not optional.
+            if optional_name in self:
+                self.add_edge(module.name, optional_name)
+
     def visualize(self, no_apt=False):
         import matplotlib.pyplot as plt