Yeah, I didn't mention it, but I didn't think it was doing this wrong
in a systematic way. I only wondered if there was some kind of
heuristic that could improve the cases where it goes wrong, without
affecting the cases where it would do it right.
I know this is not an easy problem, lest it would already been fixed.
On Wed, Dec 12, 2012 at 7:29 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Kevin <ikke@xxxxxxxxx> writes:
>
>> Regularly I notice that the diffs that are provided (through diff, or
>> add -p) tend to disconnect changes that belong to each other and
>> report lines being changed that are not changed.
>>
>> An example for this is:
>>
>> /**
>> + * Default parent
>> + *
>> + * @var int
>> + * @access protected
>> + * @index
>> + */
>> + protected $defaultParent;
>> +
>> + /**
>>
>> I understand this is a valid view of what is changed, but not a very
>> logical view from the point of the user.
>>
>> I wondered if there is a way to improve this, or would that have other
>> consequences.
>
> I think your example shows a case where the end of the pre-context
> matches the end of the added text in the hunk, and it appears it may
> produce a better result if you shift the hunk up. But I think that
> works only half the time. Imagine:
>
> @@ -K,L +M,N @@
> }
>
> +void new_function(void)
> +{
> + printf("hello, world.\n");
> +}
> +
> void existing_one(void)
> {
> printf("goodbye, world.\n");
>
> Here the end of the pre-context matches the end of the added lines,
> but it will produce worse result if you blindly apply the "shift the
> hunk up" trick:
>
> ... what was before the } we saw in the precontext ...
> +}
> +
> +void new_function(void)
> +{
> + printf("hello, world.\n");
> }
>
> void existing_one(void)
>
> So I think with s/Regularly/About half the time/, your observation
> above is correct.
>
> I think the reason you perceived this as "Regularly" is that you do
> not notice nor appreciate it when things go right (half the time),
> but you tend to notice and remember only when a wrong side happened
> to have been picked (the other half).
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