displaymenu

#! /bin/bash
set -e

#TODO: do xrandr queries only once and reuse the results.

command="xrandr"
function connectedDisplays {
  xrandr | grep " connected" | cut -d " " -f 1
}

# List available resolutions for display identifier
# given as a first parameter
function resolutions {
  local dp="$(xrandr | grep -i "$1" -A 40 | grep -v "$1")"
  if [ "$(echo "$dp" | grep connected | wc -l)" -eq 0 ]; then
    # Display was the last one listed
    echo "$dp"
  else
    # Display was not the last one. Cut out the rest of the lines
    echo "$dp" | grep -B 40 -m 1 connected | grep -v connected
  fi
}

# TODO: Find a better way to do this.
noOfActiveDisplays="$( \
  xrandr --listactivemonitors \
  | grep -i 'Monitors:' \
  | sed -e 's/Monitors: //' \
)"

function isOn {
  xrandr --listactivemonitors | grep $1 | wc -l
}

display=$(connectedDisplays | dmenu -i -l 10)
command="$command --output $display"

another=false
if [ "$noOfActiveDisplays" -eq 2 ]; then
  another="$( \
    xrandr --listactivemonitors \
    | grep -vi 'Monitors:' \
    | grep -v $display \
    | rev \
    | cut -d ' ' -f 1 \
    | rev \
  )"
fi

# Select another display.
# echo $another if it has value, othervise perform a dmenu prompt
function selectAnother {
  if [ "$another" ]; then
    echo "$another"
  else
    connectedDisplays | grep -v "$display" | dmenu -i -l 10
  fi
}

options="cancel"
if [ "$(isOn $display)" -eq 1 ]; then
  options="set resolution\nrotate left\nrotate right\ninvert\n$options"
  if [ "$noOfActiveDisplays" -gt 1 ]; then
    if [ "$noOfActiveDisplays" -gt 2 ]; then
      options="mirror ...\n$options"
      options="move above ...\n$options"
      options="move bellow ...\n$options"
      options="move left of ...\n$options"
      options="move right of ...\n$options"
    else
      options="mirror $another \n$options"
      options="move above $another \n$options"
      options="move bellow $another \n$options"
      options="move left of $another \n$options"
      options="move right of $another \n$options"
    fi
    options="turn off\n$options"
  fi
else
  options="turn on\n$options"
fi

opt=$(echo -e $options | dmenu -l 10)

case "$opt" in
  "cancel") 
    exit 0 ;;
  "turn on") 
    command="$command --auto" ;;
  "turn off") 
    command="$command --off" ;;
  "rotate left")
    command="$command --rotate left" ;;
  "rotate right")
    command="$command --rotate right" ;;
  "invert")
    command="$command --rotate inverted" ;;
  "set resolution")
    resolution="$(resolutions $display | dmenu -l 10 | cut -d " " -f 4)"
    command="$command --mode $resolution" ;;
  "move right of"*) 
    command="$command --right-of $(selectAnother)" ;;
  "move left of"*)
    command="$command --left-of $(selectAnother)" ;;
  "move above"*) 
    command="$command --above $(selectAnother)"  ;;
  "move bellow"*) 
    command="$command --bellow $(selectAnother)"  ;;
  "mirror"*)
    command="$command --same-as $(selectAnother)"  ;;
esac

if [ "$(echo -e "no\nyes" | dmenu -i -p "run: $command")" == "yes" ]; then
  echo "$command" | sh
fi