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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.
#
# Options:
# -r Enable resolution selection for each display
# Parse options
select_resolution=false
while getopts "r" opt; do
case $opt in
r) select_resolution=true ;;
*) echo "Usage: $0 [-r]" >&2; exit 1 ;;
esac
done
shift $((OPTIND - 1))
# Function to select resolution for a display
get_resolution() {
display="$1"
if [ "$select_resolution" = true ]; then
resolutions=$(xrandr --query | sed -n "/^$display/,/^[^ ]/p" | grep -v "^$display" | grep -v "^[^ ]" | awk '{print $1}' | grep -E "^[0-9]+x[0-9]+$")
chosen_res=$(echo "$resolutions" | dmenu -i -p "Resolution for $display:")
[ -n "$chosen_res" ] && echo "--mode $chosen_res" || echo "--auto"
else
echo "--auto"
fi
}
twoscreen() { # If multi-monitor is selected and there are two screens.
mirror=$(printf "no\\nyes" | dmenu -i -p "Mirror displays?")
[ -z "$mirror" ] && exit
# Mirror displays using native resolution of external display and a scaled
# version for the internal display
if [ "$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:")
[ -z "$primary" ] && exit
secondary=$(echo "$screens" | grep -v ^"$primary"$)
direction=$(printf "left\\nright" | dmenu -i -p "What side of $primary should $secondary be on?")
primary_res=$(get_resolution "$primary")
secondary_res=$(get_resolution "$secondary")
xrandr --output "$primary" --primary $primary_res --scale 1.0x1.0 --output "$secondary" --"$direction"-of "$primary" $secondary_res --scale 1.0x1.0
fi
}
morescreen() { # If multi-monitor is selected and there are more than two screens.
primary=$(echo "$screens" | dmenu -i -p "Select primary display:")
[ -z "$primary" ] && exit
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:")
primary_res=$(get_resolution "$primary")
secondary_res=$(get_resolution "$secondary")
tertiary_res=$(get_resolution "$tertiary")
xrandr --output "$primary" --primary $primary_res --output "$secondary" --"$direction"-of "$primary" $secondary_res --output "$tertiary" --"$(printf "left\\nright" | grep -v "$direction")"-of "$primary" $tertiary_res
}
multimon() { # Multi-monitor handler.
case "$(echo "$screens" | wc -l)" in
2) twoscreen ;;
*) morescreen ;;
esac
}
onescreen() { # If only one output available or chosen.
res_opt=$(get_resolution "$1")
xrandr --output "$1" --primary $res_opt --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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