Subject: Re: [PATCH v1 1/6] Allow --porcelain[=<n>] in status and commit commands

From: Jeff Hostetler <[email-masked]>
Date: Wed, 20 Jul 2016 11:38:16 -0400

On 07/20/2016 11:08 AM, Johannes Schindelin wrote:
> On Tue, 19 Jul 2016, Jeff Hostetler wrote:
>> diff --git a/builtin/commit.c b/builtin/commit.c
>> +	} else if (arg) {
>> +		int n = strtol(arg, NULL, 10);
>> +		if (n == 1)
>> +			*value = STATUS_FORMAT_PORCELAIN;
>> +		else
>> +			die("unsupported porcelain version");
>> +	} else {
>> +		*value = STATUS_FORMAT_PORCELAIN;
>
> This could be folded into the previous conditional:
>
> 	}
> 	else {
> 		int n = arg ? strtol(arg, NULL, 10) : 1;
> 		...
>

I did it this way because I didn't want to make any assumptions
here on the numeric value of the enum values.  Or rather, I didn't
want to add specific assignments to the enum type.

This also helps make it easier to see my later commit:
         else if (n == 2) *value = STATUS_FORMAT_PORCELAIN_V2;

Also, I didn't want to alter the order of assignments to the global
status_format variable.  That is, if I capture the value of <n> in
a porcelain_version variable and assign that to status_format
afterwards, there is opportunity for mistakes if they type:
         git status --short --porcelain=1 --long
where the status_format variable is assigned 3 times.

> Having said this, ...
>
>> @@ -1336,9 +1347,9 @@ int cmd_status(int argc, const char **argv, const char *prefix)
>>   			    N_("show status concisely"), STATUS_FORMAT_SHORT),
>>   		OPT_BOOL('b', "branch", &s.show_branch,
>>   			 N_("show branch information")),
>> -		OPT_SET_INT(0, "porcelain", &status_format,
>> -			    N_("machine-readable output"),
>> -			    STATUS_FORMAT_PORCELAIN),
>> +		{ OPTION_CALLBACK, 0, "porcelain", &status_format,
>> +		  N_("version"), N_("machine-readable output"),
>> +		  PARSE_OPT_OPTARG, opt_parse_porcelain },
>
> How about using a COUNTUP here instead? We could then set the status
> format afterwards, like this:
>
> 	if (porcelain == 0)
> 		status_format = STATUS_FORMAT_UNSPECIFIED;
> 	else {
> 		status_format = STATUS_FORMAT_PORCELAIN;
> 		if (porcelain > 1)
> 			warning("No porcelain v%d; falling back to v1",
> 				porcelain);
> 	}
>

Maybe I misread the COUNTUP docs, but it looked like it would
allow "--porcelain --porcelain", but not "--porcelain=2".

Jeff