Re: [PATCH v3 13/15] ref-filter: introduce remote_ref_atom_parser()

> On Tue, Jan 5, 2016 at 3:03 AM, Karthik Nayak <karthik.188@gmail.com> wrote:
>> Introduce remote_ref_atom_parser() which will parse the '%(upstream)'
>> and '%(push)' atoms and store information into the 'used_atom'
>> structure based on the modifiers used along with the corresponding
>> atom.
>>
>> Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
>> Helped-by: Eric Sunshine <sunshine@sunshineco.com>
>> Signed-off-by: Karthik Nayak <Karthik.188@gmail.com>
>> ---
>> diff --git a/ref-filter.c b/ref-filter.c
>> @@ -841,6 +863,43 @@ static inline char *copy_advance(char *dst, const char *src)
>> +static void fill_remote_ref_details(struct used_atom *atom, const char *refname,
>> +                                   struct branch *branch, const char **s)
>> +{
>> +       int num_ours, num_theirs;
>> +       if (atom->u.remote_ref == RR_SHORTEN)
>> +               *s = shorten_unambiguous_ref(refname, warn_ambiguous_refs);
>> +       else if (atom->u.remote_ref == RR_TRACK) {
>> +               if (stat_tracking_info(branch, &num_ours,
>> +                                      &num_theirs, NULL))
>> +                       return;
>> +
>> +               if (!num_ours && !num_theirs)
>> +                       *s = "";
>> +               else if (!num_ours)
>> +                       *s = xstrfmt("[behind %d]", num_theirs);
>> +               else if (!num_theirs)
>> +                       *s = xstrfmt("[ahead %d]", num_ours);
>> +               else
>> +                       *s = xstrfmt("[ahead %d, behind %d]",
>> +                                    num_ours, num_theirs);
>> +       } else if (atom->u.remote_ref == RR_TRACKSHORT) {
>> +               if (stat_tracking_info(branch, &num_ours,
>> +                                      &num_theirs, NULL))
>> +                       return;
>> +
>> +               if (!num_ours && !num_theirs)
>> +                       *s = "=";
>> +               else if (!num_ours)
>> +                       *s = "<";
>> +               else if (!num_theirs)
>> +                       *s = ">";
>> +               else
>> +                       *s = "<>";
>> +       } else if (atom->u.remote_ref == RR_NORMAL)
>> +               *s = refname;
>
> I think I mentioned this in a previous review: If the code falls past
> this final 'else if' for some reason (programmer error), then *s won't
> get assigned at all, which is probably undesirable. To protect against
> such a case, you might want either to add a final 'else':
>
>     else
>         die("BUG: ...");
>
> or just consider RR_NORMAL the catchall case, and turn the final 'else
> if' into a plain 'else':
>
>     else /* RR_NORMAL */
>         *s = refname;
>

>> +}
>> @@ -894,6 +953,8 @@ static void populate_value(struct ref_array_item *ref)
>>                         refname = branch_get_upstream(branch, NULL);
>>                         if (!refname)
>>                                 continue;
>> +                       fill_remote_ref_details(atom, refname, branch, &v->s);
>> +                       continue;
>
> There are now two 'continue' statements very close together here. Have
> you considered this instead?
>
>     if (refname)
>         fill_remote_ref_details(...);
>     continue;
>
> It might make the code a bit more straightforward. (Genuine question;
> I don't feel too strongly about it.)

>
>>                 } else if (starts_with(name, "push")) {
>>                         const char *branch_name;
>>                         if (!skip_prefix(ref->refname, "refs/heads/",
>> @@ -904,6 +965,8 @@ static void populate_value(struct ref_array_item *ref)
>>                         refname = branch_get_push(branch, NULL);
>>                         if (!refname)
>>                                 continue;
>> +                       fill_remote_ref_details(atom, refname, branch, &v->s);
>> +                       continue;
>
> Ditto.