lightningd: insert "raw" (unescaped) help messages from commands.

So if they want a \n in usage, they can have it.

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

lightningd/jsonrpc.c

@@ -1393,10 +1393,22 @@ static void setup_command_usage(struct lightningd *ld,
 bool jsonrpc_command_add(struct jsonrpc *rpc, struct json_command *command,
 			 const char *usage TAKES)
 {
+	struct json_escape *esc;
+	const char *unescaped;
+
 	if (!command_add(rpc, command))
 		return false;
-	usage = tal_strdup(command, usage);
-	strmap_add(&rpc->usagemap, command->name, usage);
+
+	esc = json_escape_string_(tmpctx, usage, strlen(usage));
+	unescaped = json_escape_unescape(command, esc);
+	if (!unescaped)
+		unescaped = tal_strdup(command, usage);
+	else {
+		if (taken(usage))
+			tal_free(usage);
+	}
+
+	strmap_add(&rpc->usagemap, command->name, unescaped);
 	tal_add_destructor2(command, destroy_json_command, rpc);
 	return true;
 }