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

[Claudio Fontana]

On 9/7/22 17:06, Markus Armbruster wrote:
> 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.

I have no problem mentioning "help" instead of "?" in the commit message (or 
both).

The function used (is_help_option) checks for both, which seems the best way to 
me.

Ciao

C

> 
>>
>> 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);
>