git prompt is very slow

[pasankg]

Executing commands on the command line takes a couple of seconds more when oh-my-git is enabled in a repository.
With oh-my-git enables running time git st

real	0m1.837s
user	0m0.421s
sys	0m8.548s

And without oh-my-git on the same repo

real	0m1.473s
user	0m0.397s
sys	0m4.889s

Also just hitting enter on the cmd line it takes about 3 seconds for the prompt to release.
I tried in my mac terminal and iTerm2 and results were the same.

Any suggestions to fix this please.
Thank you.

[p-himik]

The slowest part on my end seems to be the one that computes the amount of commits ahead/behind the upstream at https://github.com/arialdomartini/oh-my-git/blob/master/base.sh#L91-L95.

It can be dramatically improved by using this instead:

        if [[ $has_upstream == true ]]; then
            local commits_ahead commits_behind
            read -r commits_behind commits_ahead <<<$(git rev-list --left-right --count ${current_commit_hash}...${upstream} 2> /dev/null)
        fi

[p-himik]

@arialdomartini Thanks for merging! But I've belatedly realized that, I think, there's an error there - commits_behind and commits_ahead are mixed up, the order should be different. Could you please check?

[arialdomartini]

@p-himik good catch! You are right.
I fixed that.