which_term

#!/bin/bash

# A merge of ideas from the following sources
# https://askubuntu.com/q/476641
# https://github.com/dylanaraps/neofetch/blob/master/neofetch
# https://raw.githubusercontent.com/mintty/utils/master/terminal

# If TERM_PROGRAM is set, give it a name that we recognise
# Otherwise, poll the terminal and interpret what it feeds back
# Otherwise, try to glean the information from the PPID
case "${TERM_PROGRAM}" in
  ("iTerm.app")    : iTerm2 ;;
  ("Terminal.app") : "Apple Terminal" ;;
  ("Hyper")        : HyperTerm ;;
  ('')
    if read -t 1 -r -s -dc -p $'\E[>c' da < /dev/tty; then
      da=${da##$'\E'[>}
    elif uname -r | grep -qi microsoft; then
      da=95
    fi    
    # We want the following word splitting
    # shellcheck disable=SC2086
    set - ${da//;/ }

    case "${1}" in
      (0)
        : VT100
        case "${2}" in
          (95)   : tmux ;;
          (115)  : KDE-konsole ;;
          (136)  : PuTTY ;;
          (304)  : VT125 ;;
        esac
      ;;
      (1)
        : VT220
        case "${2}" in
          (2)    : openwin-xterm ;;
          (95)   : iTerm2 ;;
          (96)   : mlterm ;;
          (304)  : VT241/VT382 ;;
          (1115) : gnome-terminal ;;
          (4000) : kitty ;;
          (*)
            # This is where gnome-terminal and derivitives usually exist
            # This first test would incorrectly identify e.g. lxterminal
            #(( $2 >= 2000 )) && : gnome-terminal
            (( $2 >= 2000 )) && : "$(ps -p "$(ps -p $$ -o ppid=)" -o args=)"
          ;;
        esac
      ;;
      (2)   : VT240 ;;
      (24)  : VT320 ;;
      (18)  : VT330 ;;
      (19)  : VT340 ;;
      (41)  : VT420 ;;
      (61)  : VT510 ;;
      (64)  : VT520 ;;
      (65)  : VT525 ;;
      (28)  : DECterm ;;
      (67)  : cygwin ;;
      (77)  : mintty ;;
      (82)  : rxvt ;;
      (83)  : screen ;;
      (84)  : tmux ;;
      (85)  : rxvt-unicode ;;
      (95)  : WSL ;;
      (*)
        # Alternative command
        #printf -- '%s\n' "$(tr '\0' ' ' </proc/"$(awk '{print $4}' /proc/$$/stat)"/cmdline)"
        : "$(ps -p "$(ps -p $$ -o ppid=)" -o args=)"
      ;;
    esac
  ;;
  (*) : "${TERM_PROGRAM}" ;;
esac

export _termtype="$_"