plugin/offers: skeleton for offers plugin (EXPERIMENTAL_FEATURES)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

plugins/Makefile

@@ -25,6 +25,9 @@ PLUGIN_PAY_LIB_SRC := plugins/libplugin-pay.c
 PLUGIN_PAY_LIB_HEADER := plugins/libplugin-pay.h
 PLUGIN_PAY_LIB_OBJS := $(PLUGIN_PAY_LIB_SRC:.c=.o)
 
+PLUGIN_OFFERS_SRC := plugins/offers.c
+PLUGIN_OFFERS_OBJS := $(PLUGIN_OFFERS_SRC:.c=.o)
+
 PLUGIN_SPENDER_SRC :=				\
 	plugins/spender/fundchannel.c		\
 	plugins/spender/main.c			\
@@ -48,6 +51,11 @@ PLUGIN_ALL_SRC :=				\
 	$(PLUGIN_PAY_LIB_SRC)			\
 	$(PLUGIN_PAY_SRC)			\
 	$(PLUGIN_SPENDER_SRC)
+
+ifeq ($(EXPERIMENTAL_FEATURES),1)
+PLUGIN_ALL_SRC += $(PLUGIN_OFFERS_SRC)
+endif
+
 PLUGIN_ALL_HEADER :=				\
 	$(PLUGIN_LIB_HEADER)			\
 	$(PLUGIN_PAY_LIB_HEADER)		\
@@ -62,6 +70,10 @@ PLUGINS :=					\
 	plugins/txprepare			\
 	plugins/spenderp
 
+ifeq ($(EXPERIMENTAL_FEATURES),1)
+PLUGINS += plugins/offers
+endif
+
 # Make sure these depend on everything.
 ALL_C_SOURCES += $(PLUGIN_ALL_SRC)
 ALL_C_HEADERS += $(PLUGIN_ALL_HEADER)
@@ -122,6 +134,8 @@ $(PLUGIN_KEYSEND_OBJS): $(PLUGIN_PAY_LIB_HEADER)
 
 plugins/spenderp: bitcoin/chainparams.o bitcoin/psbt.o common/psbt_open.o $(PLUGIN_SPENDER_OBJS) $(PLUGIN_LIB_OBJS) $(PLUGIN_COMMON_OBJS) $(JSMN_OBJS) $(CCAN_OBJS)
 
+plugins/offers: bitcoin/chainparams.o $(PLUGIN_OFFERS_OBJS) $(PLUGIN_LIB_OBJS) $(PLUGIN_COMMON_OBJS) common/bolt12.o common/bolt12_merkle.o wire/bolt12_exp_wiregen.o $(WIRE_OBJS) bitcoin/block.o common/channel_id.o bitcoin/preimage.o $(JSMN_OBJS) $(CCAN_OBJS)
+
 $(PLUGIN_ALL_OBJS): $(PLUGIN_LIB_HEADER)
 
 # Generated from PLUGINS definition in plugins/Makefile

plugins/offers.c

@@ -0,0 +1,32 @@
+/* This plugin covers both sending and receiving offers */
+#include <bitcoin/chainparams.h>
+#include <bitcoin/preimage.h>
+#include <ccan/array_size/array_size.h>
+#include <common/bolt12.h>
+#include <common/bolt12_merkle.h>
+#include <common/json_stream.h>
+#include <common/overflows.h>
+#include <common/type_to_string.h>
+#include <plugins/libplugin.h>
+#include <wire/onion_wire.h>
+
+static const struct plugin_hook hooks[] = {
+};
+
+static void init(struct plugin *p,
+		 const char *buf UNUSED,
+		 const jsmntok_t *config UNUSED)
+{
+}
+
+static const struct plugin_command commands[] = {
+};
+
+int main(int argc, char *argv[])
+{
+	setup_locale();
+
+	plugin_main(argv, init, PLUGIN_RESTARTABLE, true, NULL, commands,
+		    ARRAY_SIZE(commands), NULL, 0, hooks, ARRAY_SIZE(hooks),
+		    NULL);
+}