Change how we check for git directories in cmder.lua

[MartiUK]

See https://github.com/git/git/blob/master/contrib/completion/git-prompt.sh#L362

[vladimir-kotikov]

@MartiUK, you meant this line?

[MartiUK]

@vladimir-kotikov Yeah, should cut down on the time to find a .git folder.

[jankatins]

Actually, the rebase hints and the info if I'm behind the remote are also nice... :-)

[vladimir-kotikov]

It would be great if this will improve perfomance, but i recall that we've been relying on git already at some moment before #438 and there were some perf issues... Unfortunately, git on Windows is not so super-fast as on Nix machines :(

[vladimir-kotikov]

Made some timings, and the results are not very promising (the timings are in 1/100 sec, measurements are made for directories, placed on SSD):

	Current	Using git rev-parse
Non-git directory	0	0.22
Git repo	0.30	0.55

So IMO it's better to keep the current approach. Personally for me it's not very comfortable to wait ~0.5 sec each time before thr prompt updates.

Here is the gist with git_prompt_filter function, that uses git rev-parse and prints nice results: https://gist.github.com/vladimir-kotikov/ef164c3baa8b80bd30b0

[jankatins]

@vladimir-kotikov Can you tell how you did the timing? That would make a nice test how to evaluate changes to this functions... :-)

Or was that just the printouts?

[vladimir-kotikov]

Just printouts, exactly the same as in the gist

[Stanzilla]

@DRSDavidSoft @daxgames this is no longer needed, right? we already sped that up?

[DRSDavidSoft]

I don't fully know the context of this issue, since the original line has changed