fish-shell/fish-shell — pull request #880 by mariuszs (2013-06-17 17:30:44+00:00)
Title: Informative version of git prompt 

Configuration:

set -g __fish_git_prompt_showupstream "informative"
set -g __fish_git_prompt_char_upstream_ahead "↑"
set -g __fish_git_prompt_char_upstream_behind "↓"
set -g __fish_git_prompt_char_upstream_prefix ""