Select Similar Nodes (Blender addon script)

select_similar_nodes.py

"""Blender add-on that selects all nodes in the current node editor view of the same type as the active node.
Default shortcut is Shift Ctrl Q.
"""

import bpy

bl_info = {
    "name": "Select Similar Nodes",
    "author": "Kara van Kessel",
    "description": "Select nodes of the same type as the active node",
    "version": (1, 0, 0),
    "blender": (2, 80, 0),
    "category": "Node",
}


class SelectSimilarNodes(bpy.types.Operator):
    """Select nodes of the same type as the active node"""
    bl_idname = "node.select_similar_nodes"
    bl_label = bl_info["name"]
    bl_options = {'REGISTER', 'UNDO'}
    
    @classmethod
    def select_similar_nodes_in_same_group(cls, target_node, node_tree):

        node_type = target_node.bl_static_type
        tree_contains_target_node = False
        group_nodes = []
        similar_nodes = []

        for node in node_tree.nodes:

            if node == target_node:
                tree_contains_target_node = True

            if node.bl_static_type == 'GROUP':
                group_nodes.append(node)

            if node.bl_static_type == node_type:
                similar_nodes.append(node)

        if tree_contains_target_node:
            for node in similar_nodes:
                node.select = True
        else:
            for group in group_nodes:
                cls.select_similar_nodes_in_same_group(target_node, group.node_tree)

    def execute(self, context):

        target_node = context.active_node
        node_tree = context.material.node_tree

        SelectSimilarNodes.select_similar_nodes_in_same_group(target_node, node_tree)

        return {'FINISHED'}

def menu_func(self, context):
    self.layout.operator(SelectSimilarNodes.bl_idname)

addon_keymaps = []

def register():
    bpy.utils.register_class(SelectSimilarNodes)
    bpy.types.NODE_MT_node.append(menu_func)

    wm = bpy.context.window_manager
    kc = wm.keyconfigs.addon
    if kc:
        km = wm.keyconfigs.addon.keymaps.new(name='Node Editor', space_type='NODE_EDITOR')
        kmi = km.keymap_items.new(SelectSimilarNodes.bl_idname, 'Q', 'PRESS', shift=True, ctrl=True)
        addon_keymaps.append((km, kmi))

def unregister():
    addon_keymaps.reverse()
    for km, kmi in addon_keymaps:
        km.keymap_items.remove(kmi)

    addon_keymaps.clear()

    bpy.utils.unregister_class(SelectSimilarNodes)
    bpy.types.NODE_MT_node.remove(menu_func)