On 12/12/2012 10:53 PM, Junio C Hamano wrote:
> Morten Welinder <mwelin...@gmail.com> writes:
>> Is there a reason why picking among the choices in a sliding window
>> must be contents neutral?
> Sorry, you might be getting at something interesting but I do not
> understand the question. I have no idea what you mean by "contents
> Picking between these two choices
> /** + /**
> + * Default parent + * Default parent
> + * + *
> + * @var int + * @var int
> + * @access protected + * @access protected
> + * @index + * @index
> + */ + */
> + protected $defaultParent; + protected $defaultParent;
> + +
> + /** /**
> would not affect the correctness of the patch. You may pick
> whatever you deem the most desirable, but your answer must be a
> correct patch (the definition of "correct" here is "applying that
> patch to the preimage produces the intended postimage").
> And I think if you inserted a block of text B after a context C
> where the tail of B matches the tail of C like the above, you can
> shift what you treat as "inserted" up and still come up with a
> correct patch.
I have the feeling that a few crude heuristics would go a long way
towards improving diffs like this. For example:
* Prefer to have an add/remove block that has balanced begin/end pairs
(where begin/end pairs might be opening and closing parentheses,
brackets, braces, and angle brackets, "/*" and "*/", and perhaps a
couple of other things. For SGML-like text begin and end tags could be
It would be possible to read these begin/end pairs from a
filetype-specific table or configuration setting, though this would add
complication and would also make it possible that diffs generated by two
different people are not identical if their configurations differ.
* Prefer to have a block where the first non-blank line of the block and
the first non-blank line after the block are indented by the same amount.
* Prefer to have a block with trailing (as opposed to leading or
embedded) blank lines--the more the better.
The beautiful thing is that even if the heuristics sometimes fail, the
correctness of the patch (in the sense that you have defined) is not
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