screenctl

#!/usr/bin/env bash
#
# screenctl
#
# Manage external screens
#
# Author: Emanuel Duss
#

print_usage(){
cat << EOI
Usage:
 screenctl OPTION

Options:
  modes          List available modes
  help           Show help message
  dialog         Show graphical menu
  internal       Use internal display only
  external       Use extern display only
  clone          Show same content on internal and external display
  extend [POS]   Use internal and external screen as one desktop
                 POS = { left | right }
EOI
}

main(){
  INTERNAL="$(xrandr | awk '/ (connected|[0-9]+x[0-9]+\+[0-9]+\+[0-9]+)/{n = 1; if(++i == n){screen = $1; exit}} END{print screen}')"
  EXTERNAL="$(xrandr | awk '/ (connected|[0-9]+x[0-9]+\+[0-9]+\+[0-9]+)/{n = 2; if(++i == n){screen = $1; exit}} END{print screen}')"
  WAIT="2" # Seconds

  case $1 in
    "modes")
      xrandr -q
      ;;
    "internal")
      if [[ -n "$INTERNAL" ]]
      then
        xrandr --output "$INTERNAL" --auto --output "$EXTERNAL" --off
        xrandr --output "$INTERNAL" --auto
      fi
      ;;
    "external")
      if [[ -n "$EXTERNAL" ]]
      then
        xrandr --output "$INTERNAL" --off --output "$EXTERNAL" --auto
        xrandr --output "$EXTERNAL" --auto
      fi
      ;;
    "clone")
      if [[ -n "$INTERNAL" && -n "$EXTERNAL" ]]
      then
        CLONERES="`xrandr --query | awk '/^ *[0-9]*x[0-9]*/{ print $1 }' | sort -n | uniq -d | tail -1`"
        xrandr --output "$INTERNAL" --mode "$CLONERES" \
              --output "$EXTERNAL" --same-as "$INTERNAL" --mode "$CLONERES"
      fi
      ;;
    "extend")
      if [[ -n "$INTERNAL" && -n "$EXTERNAL" ]]
      then
        case $2 in
          "left")
            xrandr --output "$INTERNAL" --auto \
                  --output "$EXTERNAL" --auto --left-of "$INTERNAL" --primary
          ;;
          "right")
            xrandr --output "$INTERNAL" --auto \
                  --output "$EXTERNAL" --auto --right-of "$INTERNAL" --primary
          ;;
          "")
            xrandr --output "$INTERNAL" --auto --pos 0x400 \
                  --output "$EXTERNAL" --auto --pos 1280x0 --primary
          ;;
          *)
            print_usage
            exit 1
          ;;
        esac
        fi
      ;;
    "dialog")
      MODE=$(zenity  --list  --text "Select screen mode:" \
        --radiolist  --column "Mode" --column "Description" \
        TRUE "Internal" \
        FALSE "External" \
        FALSE "Clone" \
        FALSE "Extend" \
        FALSE "Extend Left" \
        FALSE "Extend Right")
      if [[ -n "$MODE" ]]
      then
        $0 ${MODE,,}
      fi
      ;;
    "-h")
      print_usage
      ;;
    *)
      print_usage
      exit 1
      ;;
  esac

  #xrandr --dpi 80

  if [[ -f ~/.fehbg ]]
  then
    (sleep "$WAIT"
      ~/.fehbg
    ) &
  fi

  if pgrep conky &>/dev/null
  then
    (sleep "$WAIT"
      pkill -HUP conky 2>&1 >/dev/null
    ) &
  fi
}

main "$@"