Re: [PATCH v2 08/10] tag.c: use 'ref-filter' APIs

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On Sun, Jul 12, 2015 at 3:15 PM, Duy Nguyen <pclouds@xxxxxxxxx> wrote:
> On Thu, Jul 9, 2015 at 5:58 PM, Karthik Nayak <karthik.188@xxxxxxxxx> wrote:
>> -static int show_reference(const char *refname, const struct object_id *oid,
>> -                         int flag, void *cb_data)
>> -{
> ...
>> -
>> -       if (match_pattern(filter->name_patterns, refname)) {
> ....
>> -               printf("%-15s ", refname);
>> -               show_tag_lines(oid, filter->lines);
>> -               putchar('\n');
>> -       }
>> -
>> -       return 0;
>> -}
> ...
>> +       if (filter->lines)
>> +               format = "%(refname:shortalign=16)";
>> +       else
>> +               format = "%(refname:short)";
>
> I can see this is a faithful conversion, but this looks line an
> opportunity to avoid this special limit 15/16. Even on git.git "git
> tag -l -n1" already breaks alignment with *.msysgit.* tags (ok maybe
> msysgit, not purely git.git) When you get to "branch -l", it
> calculates the max-width automatically so you probably need
> "%(refname:shortalign)" any way. "shortalign" (i.e. create the "align"
> version for every modifier) does not look good because it could double
> the number of modifiers and let's not thinking about truncation
> options or right alignment..

What I was thinking of was getting rid of the whole "align" feature where
you provide a value to which it would align.

Something like:  --format="%(item:modifieralign)" which would use something
on the lines of what the max-width calculator in branch -l uses, to get the max
alignment size. But the problem is that ref-filter goes through the refs using
a function which has no connections with the atoms used. So a more practical
solution would be --format="%(item:modifieralign=X)" where we could provide a
means of calculating X via ref-filter. Something like this in tag.c:

int max_width = get_max_width("<item to get max_width of>");
use this max_width to then do a
--format="%(item:modifieralign=X)", where X = max_width

What do you think?

-- 
Regards,
Karthik Nayak
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