Add "tee" node type

Makefile

@@ -12,7 +12,7 @@ CPPFLAGS += $(shell pkg-config --cflags $(DEPS))
 LDLIBS += $(shell pkg-config --libs $(DEPS))
 INTERP ?=
 MAIN = main
-OBJS = main.o events.o processing.o graph.o config.o hash_table.o module_registry.o nodes/getchar.o nodes/print.o nodes/evdev.o
+OBJS = main.o events.o processing.o graph.o config.o hash_table.o module_registry.o nodes/getchar.o nodes/print.o nodes/evdev.o nodes/tee.o
 
 all: $(MAIN)
 

nodes/tee.c

@@ -0,0 +1,60 @@
+#include "../graph.h"
+#include "../module_registry.h"
+
+static bool
+handle_event(EventPositionBase * self, EventNode * event)
+{
+	GraphNode *node = DOWNCAST(GraphNode, EventPositionBase, self);
+	size_t count = node->outputs.length;
+	if (!count) {
+		event_destroy(event);
+		return true;
+	}
+	if (count > 1) {
+		count = event_replicate(event, count - 1) + 1;
+	}
+	for (size_t i = 0; i < count; ++i) {
+		event->position = &node->outputs.elements[i]->as_EventPositionBase;
+		event = event->next;
+	}
+	return true;
+}
+
+static GraphNode *
+create(GraphNodeSpecification * spec, GraphNodeConfig * config)
+{
+	(void) config;
+	GraphNode * node = T_ALLOC(1, GraphNode);
+	if (!node) {
+		return node;
+	}
+	*node = (GraphNode) {
+		.as_EventPositionBase = {
+			.handle_event = &handle_event,
+			.waiting_new_event = false,
+		},
+		.specification = spec,
+		.inputs = EMPTY_GRAPH_CHANNEL_LIST,
+		.outputs = EMPTY_GRAPH_CHANNEL_LIST,
+	};
+	return node;
+}
+
+static void destroy
+(GraphNodeSpecification * self, GraphNode * target)
+{
+	(void) self;
+	free(target);
+}
+
+GraphNodeSpecification nodespec_tee = (GraphNodeSpecification) {
+	.create = &create,
+	.destroy = &destroy,
+	.register_io = NULL,
+	.name = "tee",
+};
+
+MODULE_CONSTRUCTOR(init)
+{
+	register_graph_node_specification(&nodespec_tee);
+}