Lightweight git prompt for ksh93 (real, AT&T version of the Korn shell).

simple_ksh_git_prompt.sh

# Simple, lightweight git prompt for ksh93: if inside a git repo, adds the
# branch name to PS1, using a different color for master, develop* and other.
# Put this snippet at the bottom of your ~/.kshrc
__get_current_git_branch_name() {
  __determine_branch_color() {
    case "${1:-}" in
      master)   branch_color=196 ;; # red
      develop*) branch_color=226 ;; # yellow
      *)        branch_color=39     # blue
    esac

    echo -n "$branch_color"
  }

  branch_name="$(git rev-parse --abbrev-ref HEAD 2>/dev/null)" && \
    [ -n "$branch_name" ] && \
    use_branch_color="$(__determine_branch_color "$branch_name")" && \
    branch_name="$(printf "\e[38;5;%dm (%s)\e[0m" $use_branch_color $branch_name)"

  echo -en "$branch_name"
}

thishost=$(hostname)
export PS1='${LOGNAME}@${thishost}:${PWD/${HOME}/\~}$(__get_current_git_branch_name)$ '