libplugin.c: Handle command categories then set them in pay and autoclean

plugins/autoclean.c

@@ -71,6 +71,7 @@ static void init(struct plugin_conn *prpc)
 
 static const struct plugin_command commands[] = { {
 	"autocleaninvoice",
+	"payment",
 	"Set up autoclean of expired invoices. ",
 	"Perform cleanup every {cycle_seconds} (default 3600), or disable autoclean if 0. "
 	"Clean up expired invoices that have expired for {expired_by} seconds (default 86400). ",

plugins/libplugin.c

@@ -452,9 +452,11 @@ handle_getmanifest(struct command *getmanifest_cmd,
 
 	for (size_t i = 0; i < num_commands; i++) {
 		tal_append_fmt(&params, "{ 'name': '%s',"
+				   "    'category': '%s',"
 				   "    'usage': '%s',"
 				   "    'description': '%s'",
 			       commands[i].name,
+				   commands[i].category,
 			       strmap_get(&usagemap, commands[i].name),
 			       commands[i].description);
 		if (commands[i].long_description)

plugins/libplugin.h

@@ -18,6 +18,7 @@ extern bool deprecated_apis;
 /* Create an array of these, one for each command you support. */
 struct plugin_command {
 	const char *name;
+	const char *category;
 	const char *description;
 	const char *long_description;
 	struct command_result *(*handle)(struct command *cmd,

plugins/pay.c

@@ -1225,16 +1225,19 @@ static void init(struct plugin_conn *rpc)
 
 static const struct plugin_command commands[] = { {
 		"pay",
+		"payment",
 		"Send payment specified by {bolt11} with {amount}",
 		"Try to send a payment, retrying {retry_for} seconds before giving up",
 		json_pay
 	}, {
 		"paystatus",
+		"payment",
 		"Detail status of attempts to pay {bolt11}, or all",
 		"Covers both old payments and current ones.",
 		json_paystatus
 	}, {
 		"listpays",
+		"payment",
 		"List result of payment {bolt11}, or all",
 		"Covers old payments (failed and succeeded) and current ones.",
 		json_listpays