[PATCH BlueZ v2 1/4] client/main: add help option for available args

[Ronan Pigott <rpigott314@gmail.com>]

From: Ronan Pigott <rpigott@berkeley.edu>

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 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/client/main.c b/client/main.c
index 578b3c7c3..0f810901a 100644
--- a/client/main.c
+++ b/client/main.c
@@ -800,6 +800,14 @@ 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)
-- 
2.22.1