Re: [PATCH v2 05/10] log-tree: use ref_namespaces instead of if/else-if

[Derrick Stolee <derrickstolee@github.com>]

On 8/4/2022 9:31 AM, Derrick Stolee wrote:
> On 8/3/2022 2:31 AM, Junio C Hamano wrote:
>> "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:
>>
>>> From: Derrick Stolee <derrickstolee@github.com>
>>> +	for (i = 0; i < NAMESPACE__COUNT; i++) {
>>> +		struct ref_namespace_info *info = &ref_namespaces[i];
>>> +
>>> +		if (!info->decoration)
>>> +			continue;
>>> +		if (info->exact) {
>>> +			if (!strcmp(refname, info->ref)) {
>>> +				deco_type = info->decoration;
>>> +				break;
>>> +			}
>>> +		} else if (starts_with(refname, info->ref)) {
>>> +			deco_type = info->decoration;
>>> +			break;
>>> +		}
>>> +	}
>>
>> Very nice.  The double-dash in the NAMESPACE__COUNT constant somehow
>> looks strange.  As we scan through ref_namespace[] array densely,
>>
>> 	for (i = 0; i < ARRAY_SIZE(ref_namespace); i++)
>> 		...
>>
>> without having to use the constant would probably be more in line
>> with the way how the rest of the codebase works.
> 
> Ah, I did not know about that trick. Thanks!

...except that it doesn't work because the array is declared as
'extern' so we don't know its size outside of refs.c.

This motivates the use of NAMESPACE__COUNT (and the double
underscores differentiates the "COUNT" from other namespaces, so
there is no confusion about "COUNT" being a namespace). If there
is another way around this, then I would love to hear it!

Thanks,
-Stolee