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List:       git
Subject:    Re: Tackling Git Limitations with Singular Large Line-seperated Plaintext files
From:       Jakub Narębski <jnareb () gmail ! com>
Date:       2014-06-30 12:56:04
Message-ID: 53B15E64.9030005 () gmail ! com
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Linus Torvalds wrote:
> On Fri, Jun 27, 2014 at 10:48 AM, Junio C Hamano <gitster@pobox.com> wrote:
>>
>> Even though the original question mentioned "delta discovery", I
>> think what was being asked is not "delta" in the Git sense (which
>> your answer is about) but is "can we diff two long sequences of text
>> (that happens to consist of only 4-letter alphabet but that is a
>> irrelevant detail) without holding both in-core in their entirety?",
>> which is a more relevant question/desire from the application point
>> of view.
>
> .. even there, there's another issue. With enough memory, the diff
> itself should be fairly reasonable to do, but we do not have any sane
> *format* for diffing those kinds of things.
>
> The regular textual diff is line-based, and is not amenable to
> comparing two long lines. You'll just get a diff that says "the two
> really long lines are different".
>
> The binary diff option should work, but it is a horrible output
> format, and not very helpful. It contains all the relevant data ("copy
> this chunk from here to here"), but it's then shown in a binary
> encoding that isn't really all that useful if you want to say "what
> are the differences between these two chromosomes".

There is also --word-diff[=<mode>] word-based textual diff,
and I think one can abuse --word-diff-regex=<regex> for
character-based diff... or maybe not, as <regex> specifies
word characters, not words or word separators.

-- 
Jakub Narębski

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