Re: [PATCH] audio: add help option (?) for -audiodev

[Markus Armbruster <armbru@redhat.com>]

Claudio Fontana <cfontana@suse.de> writes:

> add a simple help option for -audiodev, so users can do
>
> qemu -audiodev ?

The preferred form is actually '-audiodev help'.  The other one is
deprecated.  Recommend to stay away from it even in commit messages.

>
> to get the list of drivers available.
>
> Signed-off-by: Claudio Fontana <cfontana@suse.de>
> ---
>  audio/audio.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/audio/audio.c b/audio/audio.c
> index 4f4bb10cce..bd8c18c3cd 100644
> --- a/audio/audio.c
> +++ b/audio/audio.c
> @@ -32,6 +32,7 @@
>  #include "qapi/qapi-visit-audio.h"
>  #include "qemu/cutils.h"
>  #include "qemu/module.h"
> +#include "qemu/help_option.h"
>  #include "sysemu/sysemu.h"
>  #include "sysemu/replay.h"
>  #include "sysemu/runstate.h"
> @@ -2105,10 +2106,29 @@ static void audio_validate_opts(Audiodev *dev, Error **errp)
>      }
>  }
>  
> +static void audio_help(void)
> +{
> +    int i;
> +
> +    printf("Available audiodev types:\n");
> +    printf("none\n");
> +
> +    for (i = 0; audio_prio_list[i]; i++) {
> +        audio_driver *driver = audio_driver_lookup(audio_prio_list[i]);
> +        if (driver) {
> +            printf("%s\n", driver->name);
> +        }
> +    }
> +}
> +
>  void audio_parse_option(const char *opt)
>  {
>      Audiodev *dev = NULL;
>  
> +    if (is_help_option(opt)) {
> +        audio_help();
> +        exit(0);
> +    }
>      Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
>      visit_type_Audiodev(v, NULL, &dev, &error_fatal);
>      visit_free(v);