xrandr script to configure dual monitors

2monitors.sh

#!/bin/sh

# --- check which is the second monitor, if any ---

if xrandr | grep -q "HDMI1 connected"
then
   monitor=HDMI1
elif xrandr | grep -q "^DP1 connected"
then
   monitor=DP1
else
   monitor=VGA1
fi

modes_for() {
   xrandr | awk "
      /$1 connected/ { s=1; next }
      /connected/ { nextfile }
      /^ .*/ { print }
   " | sort -tx -n --reverse 
}

if xrandr | grep -q "eDP1 connected"
then
   # --- Dell XPS 12 ---
   native_laptop_res=1920x1080
   laptop=eDP1
   xrandr --newmode "1366x768"  85.86  1368 1440 1584 1800  768 769 772 795  -HSync +Vsync &> /dev/null
   xrandr --addmode eDP1 "1366x768" &> /dev/null
else
   # --- HP pavillion ---
   native_laptop_res=1366x768
   laptop=LVDS1
fi

# --- default option: two monitors
if [ "$1" = "on" ] || [ "$1" = "" ] && xrandr | grep -q "$monitor connected"
then
   if xrandr | grep -q "1920x1080"
   then
      #lablua_offset=0x220
      lablua_offset=0x0
      xrandr --output $monitor --mode 1920x1080 --primary
      xrandr --output $laptop --left-of $monitor --mode 1366x768 --pos $lablua_offset
      xrandr --output $laptop --pos $lablua_offset
      #xrandr --output $monitor --gamma 1.44:1.44:1.44 # LG LabLua
      #xrandr --output $laptop --gamma 0.97:0.97:0.97  # Dell XPS 12
      #xinput set-prop "ATML1000:00 03EB:842F" --type=float "Coordinate Transformation Matrix" 0.41570298234936 0 0 0 1 0 0 0 1
      #xinput set-prop "ATML1000:00 03EB:842F" --type=int "Evdev Axis Calibration" 5 4073 -42 5759
   elif xrandr | grep -q "1280x1024"
   then
      xrandr --output $monitor --mode 1280x1024
      xrandr --output $laptop --right-of $monitor --mode 1366x768 --pos 1281x0 --primary
   fi
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
   xbacklight -set 100
# --- external monitor only, in Full HD
elif [ "$1" = "filme" -o "$1" = "movie" ]
then
   xrandr --output $laptop --off
   xrandr --output $monitor --mode 1920x1080 --primary --preferred
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
#   wmctrl -i -r `wmctrl -l | grep xfce4-panel | grep -v grep | cut -d" " -f1 | head -n 1` -e 0,0,0,-1,-1
#   wmctrl -i -r `wmctrl -l | grep xfce4-panel | grep -v grep | cut -d" " -f1 | tail -n 1` -e 0,0,-1,-1,-1
   xbacklight -set 10
   xset s noblank
   xset s off

# --- mirror modes for presentations
elif [ "$1" = "mirror" ]
then
   xrandr --output $laptop --mode 1024x768
   xrandr --output $monitor --right-of $laptop --mode 1024x768 --same-as $laptop
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
   killall xscreensaver
   xbacklight -set 100
elif [ "$1" = "mirrorhd" ]
then
   xrandr --output $laptop --mode 1920x1080
   xrandr --output $monitor --right-of $laptop --mode 1920x1080 --same-as $laptop
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
   killall xscreensaver
   xbacklight -set 100
elif [ "$1" = "mirror1024" ]
then
   xrandr --output $laptop --mode 1024x768 
   xrandr --output $monitor --right-of $laptop --mode  1024x768 --same-as $laptop --rate 60
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
   killall xscreensaver
   xbacklight -set 100
elif [ "$1" = "mirror800" ]
then
   xrandr --output $laptop --mode 800x600 
   xrandr --output $monitor --right-of $laptop --mode  800x600 --same-as $laptop --rate 60
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
   killall xscreensaver
   xbacklight -set 100
elif [ "$1" = "mirror640" ]
then
   xrandr --output $laptop --mode 640x480 
   xrandr --output $monitor --right-of $laptop --mode  640x480 --same-as $laptop --rate 60
   #alsactl --file /Users/hisham/bin/2monitors_front_alsa.conf restore
   killall xscreensaver
   xbacklight -set 100

# --- laptop screen only, list modes
elif [ "$1" = "list" ]
then
   modes_for $laptop | cat -n

# --- laptop screen only, set mode
elif [ "$1" = "set" -o "$1" = "mode" ]
then
   xrandr --output $laptop --mode $(modes_for $laptop | head -n $2 | tail -n 1 | awk '{print $1}' | tr -d '*')
   modes_for $laptop | cat -n
   xbacklight -set 10
   
# --- laptop screen only, lower res
elif [ "$1" = "lower" ]
then
   res=$(modes_for $laptop | awk "
      /\*/ { n=1; next }
      /.*/ { if (n==1) { print \$1; nextfile } }
   ")
   if [ "$res" ]
   then
      xrandr --output $laptop --mode $res
   fi
   xbacklight -set 10
# --- laptop screen only, higher res
elif [ "$1" = "higher" ]
then
   res=$(modes_for $laptop | awk "
      /\*/ { print prev; nextfile }
      /.*/ { prev=\$1; next }
   ")
   if [ "$res" ]
   then
      xrandr --output $laptop --mode $res
   fi
   xbacklight -set 10
# --- laptop screen only
else
   xrandr --output $laptop --mode $native_laptop_res
   xrandr --output HDMI1 --off
   xrandr --output $monitor --off
   #alsactl --file /Users/hisham/bin/2monitors_speakers_alsa.conf restore
   xbacklight -set 10
fi

#xrandr --auto
kill -HUP `pidof awesome`