git branch styled in prompt

.bashrc

# if GIT_PS1_SHOWDIRTYSTATE is set to a nonempty value,
# unstaged (*) and staged (+) changes will be shown next to the branch name
export GIT_PS1_SHOWDIRTYSTATE=1

# if GIT_PS1_SHOWSTASHSTATE is set to a nonempty value,
# a ‘$’ will be shown next to the branch name if something is stashed
export GIT_PS1_SHOWSTASHSTATE=1

# if GIT_PS1_SHOWUNTRACKEDFILES is set to a nonempty value,
# a ‘%’ will be shown next to the branch name if there’re untracked files
export GIT_PS1_SHOWUNTRACKEDFILES=1

# my fancy non disturbing prompt, listing the current git branch
export PS1='\[\033[37m\]\h\[\033[00m\]:\w\[\033[1;33m\]$(__git_ps1 "@%s")\[\033[00m\]$ '