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#!/bin/sh
# A UI for detecting and selecting all displays. Probes xrandr for connected
# displays and lets user select one to use. User may also select "manual
# selection" which opens arandr.
twoscreen() { # If multi-monitor is selected and there are two screens.
mirror=$(printf "no\\nyes" | dmenu -i -p "Mirror displays?")
# Mirror displays using native resolution of external display and a scaled
# version for the internal display
if [ "$mirror" = "yes" ]; then
external=$(echo "$screens" | dmenu -i -p "Optimize resolution for:")
internal=$(echo "$screens" | grep -v "$external")
res_external=$(xrandr --query | sed -n "/^$external/,/\+/p" | \
tail -n 1 | awk '{print $1}')
res_internal=$(xrandr --query | sed -n "/^$internal/,/\+/p" | \
tail -n 1 | awk '{print $1}')
res_ext_x=$(echo "$res_external" | sed 's/x.*//')
res_ext_y=$(echo "$res_external" | sed 's/.*x//')
res_int_x=$(echo "$res_internal" | sed 's/x.*//')
res_int_y=$(echo "$res_internal" | sed 's/.*x//')
scale_x=$(echo "$res_ext_x / $res_int_x" | bc -l)
scale_y=$(echo "$res_ext_y / $res_int_y" | bc -l)
xrandr --output "$external" --auto --scale 1.0x1.0 \
--output "$internal" --auto --same-as "$external" \
--scale "$scale_x"x"$scale_y"
else
primary=$(echo "$screens" | dmenu -i -p "Select primary display:")
secondary=$(echo "$screens" | grep -v "$primary")
direction=$(printf "left\\nright" | dmenu -i -p "What side of $primary should $secondary be on?")
xrandr --output "$primary" --auto --scale 1.0x1.0 --output "$secondary" --"$direction"-of "$primary" --auto --scale 1.0x1.0
fi
}
morescreen() { # If multi-monitor is selected and there are more than two screens.
primary=$(echo "$screens" | dmenu -i -p "Select primary display:")
secondary=$(echo "$screens" | grep -v "$primary" | dmenu -i -p "Select secondary display:")
direction=$(printf "left\\nright" | dmenu -i -p "What side of $primary should $secondary be on?")
tertiary=$(echo "$screens" | grep -v "$primary" | grep -v "$secondary" | dmenu -i -p "Select third display:")
xrandr --output "$primary" --auto --output "$secondary" --"$direction"-of "$primary" --auto --output "$tertiary" --"$(printf "left\\nright" | grep -v "$direction")"-of "$primary" --auto
}
multimon() { # Multi-monitor handler.
case "$(echo "$screens" | wc -l)" in
2) twoscreen ;;
*) morescreen ;;
esac ;}
onescreen() { # If only one output available or chosen.
xrandr --output "$1" --auto --scale 1.0x1.0 $(echo "$allposs" | grep -v "\b$1" | awk '{print "--output", $1, "--off"}' | paste -sd ' ' -)
}
postrun() { # Stuff to run to clean up.
setbg # Fix background if screen size/arangement has changed.
{ killall dunst ; setsid -f dunst ;} >/dev/null 2>&1 # Restart dunst to ensure proper location on screen
}
# Get all possible displays
allposs=$(xrandr -q | grep "connected")
# Get all connected screens.
screens=$(echo "$allposs" | awk '/ connected/ {print $1}')
# If there's only one screen
[ "$(echo "$screens" | wc -l)" -lt 2 ] &&
{ onescreen "$screens"; postrun; notify-send "💻 Only one screen detected." "Using it in its optimal settings..."; exit ;}
# Get user choice including multi-monitor and manual selection:
chosen=$(printf "%s\\nmulti-monitor\\nmanual selection" "$screens" | dmenu -i -p "Select display arangement:") &&
case "$chosen" in
"manual selection") arandr ; exit ;;
"multi-monitor") multimon ;;
*) onescreen "$chosen" ;;
esac
postrun
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