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)
 

config.c

@@ -135,3 +135,21 @@ load_config(const config_setting_t *config_root, FullConfig *config)
 	config->channels = load_channels_section(channel_config);
 	return true;
 }
+
+void
+reset_config(FullConfig *config)
+{
+	if (!config) {
+		return;
+	}
+	if (config->nodes.items) {
+		free(config->nodes.items);
+		config->nodes.items = NULL;
+		config->nodes.length = 0;
+	}
+	if (config->channels.items) {
+		free(config->channels.items);
+		config->channels.items = NULL;
+		config->channels.length = 0;
+	}
+}

config.h

@@ -33,5 +33,6 @@ typedef struct {
 } FullConfig;
 
 bool load_config(const config_setting_t *config_root, FullConfig *config);
+void reset_config(FullConfig *config);
 
 #endif /* end of include guard: CONFIG_H_ */

events.c

@@ -25,7 +25,7 @@ event_replicate(EventNode * source, size_t count)
 		replica->data.modifiers = modifier_set_copy(source->data.modifiers);
 		replica->prev = source;
 		replica->next = source->next;
-		source->next->next->prev = replica;
+		source->next->prev = replica;
 		source->next = replica;
 	}
 	return i;
@@ -72,3 +72,15 @@ event_destroy(EventNode * self)
 	self->next = NULL;
 	free(self);
 }
+
+void event_destroy_all()
+{
+	EventNode *ev;
+	while ((ev = FIRST_EVENT) != &END_EVENTS) {
+		event_destroy(ev);
+		if (ev == FIRST_EVENT) {
+			fprintf(stderr, "Broken doubly linked event list invariant\n");
+			abort();
+		}
+	}
+}

events.h

@@ -47,5 +47,6 @@ extern EventNode END_EVENTS;
 size_t event_replicate(EventNode * source, size_t count);
 EventNode * event_create(const EventData * content);
 void event_destroy(EventNode * self);
+void event_destroy_all();
 
 #endif /* end of include guard: EVENTS_H_ */

main.c

@@ -82,9 +82,11 @@ main(int argc, char ** argv)
 	for (ssize_t i = loaded_config.nodes.length - 1; i >= 0; --i) {
 		graph_node_delete(nodes[i]);
 	}
+	event_destroy_all();
 	free(channels);
 	free(nodes);
 
+	reset_config(&loaded_config);
 	config_destroy(&config_tree);
 
 	io_subscription_list_deinit(&state.wait_output);

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);
+}