Re: Features from GitSurvey 2010

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On Tue, Feb 1, 2011 at 8:51 PM, Jakub Narebski <jnareb@xxxxxxxxx> wrote:
> On Sun, 30 Jan 2011, Jonathan Nieder wrote:
>> > support for tracking empty directories
>>
>> Tricky to get the UI right. ÂI am interested in and would be glad to
>> help with this one.
>
> Also one needs to remember that this would require adding extension
> to git index, because currently it tracks only files, and not
> directories. ÂExplicitly tracking directories in the index could be
> useful for other purposes...
>
> The major difficulty of this is IMHO not the UI, but tracking all those
> tricky corner cases (like directory/file conflict, etc.).

Sort order in index is quite special/strange and must be handled
correctly when dirs and files are mixed. There are already special
directories in index: the submodules. Current git code treats
S_ISDIR() and S_ISGITLINK() the same in ce_to_dtype() and some more
places. You need to decouple it somehow.

I tried this (for another purpose) and pulled back. I recall Shawn had
a tree-based index implementation, don't know if he still has it.
Could be a good point to start adding dirs to index.

Actually tree-based index with dictionary (something like trees in
packv4) is a good feature itself. It could shrink index size down a
lot. index is frequently read/written so small index helps (webkit's
index is 16M, 4M after gzipped).
-- 
Duy
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