From d45b4ac3ecf3f2f7703384e00e4275fcca6cd793 Mon Sep 17 00:00:00 2001
From: Ronan Pigott <rpigott@berkeley.edu>
Date: Fri, 16 Aug 2019 23:34:49 -0700
Subject: [PATCH] client/main: add help option for available args

This option exists to facilitate external completion of commands that
have specially defined arguments. It effectively adds two new commands
to bluetoothctl with the following output:

$ bluetoothctl agent help
on
off
DisplayOnly
DisplayYesNo
KeyboardDisplay
KeyboardOnly
NoInputNoOutput

$ bluetoothctl advertise help
on
off
peripheral
broadcast

Shell completion scripts can then parse this output to provide
completions for those commands.
---
 client/main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/client/main.c b/client/main.c
index 578b3c7c3..68dabda02 100644
--- a/client/main.c
+++ b/client/main.c
@@ -800,6 +800,13 @@ static gboolean parse_argument(int argc, char *argv[], const char **arg_table,
 {
 	const char **opt;
 
+	if (!strcmp(argv[1], "help")) {
+		for (opt = arg_table; opt && *opt; opt++)
+			bt_shell_printf("%s\n", *opt);
+		bt_shell_noninteractive_quit(EXIT_SUCCESS);
+		return FALSE;
+	}
+
 	if (!strcmp(argv[1], "on") || !strcmp(argv[1], "yes")) {
 		*value = TRUE;
 		if (option)
-- 
2.47.3