#! /bin/zsh
#
# this file:
#   https://dataswamp.org/~incal/conf/.zsh/prompt
#
# PROMPT (zsh's bash's PS1)
#   format
#     %B .......... %b (bold/bright)
#     %F{color} ... %f (font color)
#     %K{color} ... %k (background color)
#   path
#     %3~        (3 levels: current directory + two parents)
#     %(4~|../|) (show 4th level as '../')


tty_path=$(tty)
pts_path=${tty_path#/dev/}
instance=${pts_path#pts/}
add_whitespace=${instance//tty/tty }
tty_number=$add_whitespace

prompt_vt=''

system=$(uname)
case $system in
    (SunOS) prompt_vt="%K{red}%F{white}sun%f%k " ;;
esac

PROMPT=" %B$prompt_vt%F{magenta}$tty_number%f %F{green}%~%f%b "