git prompt : branch only

.bashrc

# see https://coderwall.com/p/fasnya/add-git-branch-name-to-bash-prompt

# Terminal colours (after installing GNU coreutils)
NM="\[\033[0;38m\]"  # means no background and white lines
GR="\[\033[0;90m\]"  # dark grey
HI="\[\033[0;37m\]"  # change this for letter colors
HII="\[\033[0;31m\]" # change this for letter colors
SI="\[\033[0;33m\]"  # this is for the current directory
IN="\[\033[0m\]"

parse_git_branch() {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ \1 /'
}

#export PS1="$NM[ $HI\u $HII\h $SI\w$NM ] $IN"
export PS1="$HII\h $SI\w$GR\$(parse_git_branch)$NM] $IN"