Replace RespStateList crazy with a nicer solution

Many thanks to Deledrius for pointing out an example of this hackery in
Blender's node groups!

korman/nodes/node_core.py

@@ -51,14 +51,26 @@ class PlasmaNodeBase:
 
     def link_input(self, tree, node, out_key, in_key):
         """Links a given Node's output socket to a given input socket on this Node"""
-        in_socket = self.find_input_socket(in_key)
+        if isinstance(in_key, str):
-        out_socket = node.find_output_socket(out_key)
+            in_socket = self.find_input_socket(in_key)
+        else:
+            in_socket = in_key
+        if isinstance(out_key, str):
+            out_socket = node.find_output_socket(out_key)
+        else:
+            out_socket = out_key
         link = tree.links.new(in_socket, out_socket)
 
     def link_output(self, tree, node, out_key, in_key):
         """Links a given Node's input socket to a given output socket on this Node"""
-        in_socket = node.find_input_socket(in_key)
+        if isinstance(in_key, str):
-        out_socket = self.find_output_socket(out_key)
+            in_socket = node.find_input_socket(in_key)
+        else:
+            in_socket = in_key
+        if isinstance(out_key, str):
+            out_socket = self.find_output_socket(out_key)
+        else:
+            out_socket = out_key
         link = tree.links.new(in_socket, out_socket)
 
     @classmethod
@@ -66,6 +78,19 @@ class PlasmaNodeBase:
         return (context.bl_idname == "PlasmaNodeTree")
 
 
+class PlasmaNodeVariableInput(PlasmaNodeBase):
+    def ensure_sockets(self, idname, name, identifier=None):
+        """Ensures there is one (and only one) empty input socket"""
+        empty = [i for i in self.inputs if i.bl_idname == idname and not i.links]
+        if not empty:
+            if identifier is None:
+                self.inputs.new(idname, name)
+            else:
+                self.inputs.new(idname, name, identifier)
+        while len(empty) > 1:
+            self.inputs.remove(empty.pop())
+
+
 class PlasmaNodeSocketBase:
     def draw(self, context, layout, node, text):
         layout.label(text)

korman/nodes/node_responder.py

@@ -29,67 +29,30 @@ class PlasmaResponderNode(PlasmaNodeBase, bpy.types.Node):
         self.outputs.new("PlasmaRespStateSocket", "States", "states")
 
 
-class PlasmaResponderStateNode(PlasmaNodeBase, bpy.types.Node):
+class PlasmaResponderStateNode(PlasmaNodeVariableInput, bpy.types.Node):
     bl_category = "LOGIC"
     bl_idname = "PlasmaResponderStateNode"
     bl_label = "Responder State"
 
-    def init(self, context):
-        self.inputs.new("PlasmaRespStateSocket", "Condition", "whodoneit")
-        self.outputs.new("PlasmaRespCommandSocket", "Commands", "cmds")
-        self.outputs.new("PlasmaRespStateSocket", "Trigger", "gotostate").link_limit = 1
-
-
-class PlasmaRespStateSocketBase(PlasmaNodeSocketBase):
-    bl_color = (0.388, 0.78, 0.388, 1.0)
-
-
-class PlasmaRespStateSocket(PlasmaRespStateSocketBase, bpy.types.NodeSocket):
     default_state = BoolProperty(name="Default State",
-                                 description="This state is the Responder's default",
+                                 description="This state is the responder's default",
                                  default=False)
 
-    def draw(self, context, layout, node, text):
+    def init(self, context):
-        # If this is a RespoderState node and the parent is a Responder, offer the user the
+        self.outputs.new("PlasmaRespCommandSocket", "Commands", "cmds")
-        # ability to make this the default state.
+        self.outputs.new("PlasmaRespStateSocket", "Trigger", "gotostate").link_limit = 1
-        if self.is_linked and not self.is_output:
-            # Before we do anything, see if we need to do a delayed update...
-            if node.bl_idname == "PlasmaResponderStateNode":
-                parent = node.find_input("whodoneit", "PlasmaResponderNode")
-                if parent is not None:
-                    layout.prop(self, "default_state")
-                    return
-
-        # Still here? Draw the text.
-        layout.label(text)
-
 
-class PlasmaResponderStateListNode(PlasmaNodeBase, bpy.types.Node):
+    def draw_buttons(self, context, layout):
-    bl_category = "LOGIC"
+        # This actually draws nothing, but it makes sure we have at least one empty input slot
-    bl_idname = "PlasmaResponderStateListNode"
+        # We need this because it's possible that multiple OTHER states can call us
-    bl_label = "Responder State List"
+        self.ensure_sockets("PlasmaRespStateSocket", "Condition")
 
-    def add_state_input(self):
+        # Now draw a prop
-        self.inputs.new("PlasmaRespStateListSocket", str(uuid.uuid4()))
+        layout.prop(self, "default_state")
 
-    def init(self, context):
-        # Inputs will be added by the user
-        self.outputs.new("PlasmaRespStateSocket", "Go To State", "gotostate")
 
-    def draw_buttons(self, context, layout):
+class PlasmaRespStateSocket(PlasmaNodeSocketBase, bpy.types.NodeSocket):
-        # This will allow us to add input states on the fly.
+    bl_color = (0.388, 0.78, 0.388, 1.0)
-        # Caveat: We're only showing this operator in the properties because we need the node
-        #         to be active in the operator...
-        op = layout.operator("node.plasma_add_responder_state", text="Add State", icon="ZOOMIN")
-        op.node_name = self.name
-
-
-class PlasmaRespStateListSocket(PlasmaRespStateSocketBase, bpy.types.NodeSocket):
-    def draw(self, context, layout, node, text):
-        # We'll allow them to delete all their inputs if they want to be stupid...
-        props = layout.operator("node.plasma_remove_responder_state", text="", icon="X")
-        props.node_name = node.name
-        props.socket_name = self.name
 
 
 class PlasmaResponderCommandNode(PlasmaNodeBase, bpy.types.Node):

korman/operators/__init__.py

@@ -16,7 +16,6 @@
 from . import op_export as exporter
 from . import op_lightmap as lightmap
 from . import op_modifier as modifier
-from . import op_nodes as node
 from . import op_world as world
 
 def register():

korman/operators/op_nodes.py

@@ -1,55 +0,0 @@
-#    This file is part of Korman.
-#
-#    Korman is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU General Public License as published by
-#    the Free Software Foundation, either version 3 of the License, or
-#    (at your option) any later version.
-#
-#    Korman is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU General Public License for more details.
-#
-#    You should have received a copy of the GNU General Public License
-#    along with Korman.  If not, see <http://www.gnu.org/licenses/>.
-
-import bpy
-from bpy.props import *
-
-class NodeOperator:
-    def get_node_tree(self, context):
-        space = context.space_data
-        if space.type != "NODE_EDITOR":
-            raise RuntimeError("Operator '{}' should only be used in the node editor".format(self.bl_idname))
-        return space.node_tree
-
-    @classmethod
-    def poll(cls, context):
-        return context.scene.render.engine == "PLASMA_GAME"
-
-
-class ResponderStateAddOperator(NodeOperator, bpy.types.Operator):
-    bl_idname = "node.plasma_add_responder_state"
-    bl_label = "Add Responder State Socket"
-
-    node_name = StringProperty(name="Node's name", options={"HIDDEN"})
-
-    def execute(self, context):
-        tree = self.get_node_tree(context)
-        tree.nodes[self.node_name].add_state_input()
-        return {"FINISHED"}
-
-
-class ResponderStateRemoveOperator(NodeOperator, bpy.types.Operator):
-    bl_idname = "node.plasma_remove_responder_state"
-    bl_label = "Remove Responder State Socket"
-
-    node_name = StringProperty(name="Node's name", options={"HIDDEN"})
-    socket_name = StringProperty(name="Socket name to remove", options={"HIDDEN"})
-
-    def execute(self, context):
-        tree = self.get_node_tree(context)
-        node = tree.nodes[self.node_name]
-        socket = node.inputs[self.socket_name]
-        node.inputs.remove(socket)
-        return {"FINISHED"}

korman/properties/modifiers/region.py

@@ -94,8 +94,8 @@ class PlasmaFootstepRegion(PlasmaModifierProperties, PlasmaModifierLogicWiz):
         respmod = nodes.new("PlasmaResponderNode")
         respmod.link_input(tree, logicmod, "trigger", "whodoneit")
         respstate = nodes.new("PlasmaResponderStateNode")
-        respstate.link_input(tree, respmod, "states", "whodoneit")
+        respstate.link_input(tree, respmod, "states", respstate.inputs.new("PlasmaRespStateSocket", "Responder"))
-        respstate.find_input_socket("whodoneit").default_state = True
+        respstate.default_state = True
         respcmd = nodes.new("PlasmaResponderCommandNode")
         respcmd.link_input(tree, respstate, "cmds", "whodoneit")