Show git branch in command line

.profile

# show git branch in prompt
# https://coderwall.com/p/pn8f0g/show-your-git-status-and-branch-in-color-at-the-command-prompt
# add to .profile of your user directory ( nano ~/.profile )
# reload with: source ~/.profile

COLOR_RED="\033[0;31m"
COLOR_YELLOW="\033[0;33m"
COLOR_GREEN="\033[0;32m"
COLOR_OCHRE="\033[38;5;95m"
COLOR_BLUE="\033[0;34m"
COLOR_WHITE="\033[0;37m"
COLOR_RESET="\033[0m"

function git_color {
  local git_status="$(git status 2> /dev/null)"

  if [[ ! $git_status =~ "working directory clean" ]]; then
    echo -e $COLOR_RED
  elif [[ $git_status =~ "Your branch is ahead of" ]]; then
    echo -e $COLOR_YELLOW
  elif [[ $git_status =~ "nothing to commit" ]]; then
    echo -e $COLOR_GREEN
  else
    echo -e $COLOR_OCHRE
  fi
}

function git_branch {
  local git_status="$(git status 2> /dev/null)"
  local on_branch="On branch ([^${IFS}]*)"
  local on_commit="HEAD detached at ([^${IFS}]*)"

  if [[ $git_status =~ $on_branch ]]; then
    local branch=${BASH_REMATCH[1]}
    echo "($branch)"
  elif [[ $git_status =~ $on_commit ]]; then
    local commit=${BASH_REMATCH[1]}
    echo "($commit)"
  fi
}

PS1+="\[\$(git_color)\]"        # colors git status
PS1+="\$(git_branch)"           # prints current branch
PS1+="\[$COLOR_RESET\] "
export PS1