#!/bin/bash

# 3urxvt - is a script that opens 3 urxvt windows, centered, with specific width/height on specific virtual screen.
# needs 'xrandr','xdotool' and 'awk' < in repos

# illustration
#+---------------------------------------------------+
#|            +-------------------------+            |
#|            |urxvt1                   |            |
#|            |                         |            |
#|            |                         |            |
#|            +-------------------------+            |
#|            +-------------------------+            |
#|            |urxvt2                   |            |
#|            |                         |            |
#|            |                         |            |
#|            +-------------------------+            |
#|            +-------------------------+            |
#|            |urxvt3                   |            |
#|            |                         |            |
#|            |                         |            |
#|            +-------------------------+            |
#+---------------------------------------------------+

# remember what desktop is active now
desknow=$(xdotool get_desktop)

# configurable variables
xdotool set_desktop 1   # change me to a desktop you want urxvt windows to open
w="1000"                # window width
h="360"                 # window height
margin="-5"             # bottom margin
y="50"                  # y pos of first window
sleep="0.1"             # sleep time < this should NOT be neccesary

# checks
command -v xrandr >/dev/null 2>&1 ||    { >&2 echo "I need xrandr." ; exit 1; }
command -v xdotool >/dev/null 2>&1 ||   { >&2 echo "I need xdotool." ; exit 1; }
command -v awk >/dev/null 2>&1 ||   { >&2 echo "I need awk." ; exit 1; }

# get screen resolution width and halve it
width=$(xrandr --current | awk '/Screen/ {print $8}')
halfwidth=$((width / 2))

# calc stuff
center=$((halfwidth - w / 2))

echo "halfwidth $halfwidth"     # screen center
echo "center $center"           # the actual x position to move a window to become centered

# check if they are allready running and only run if they are not
xdotool search -name 'term1' windowactivate && { echo "term1 already running" ; } || \
(urxvt -title term1 & sleep "$sleep") && xdotool search --sync --name 'term1' windowactivate windowsize "$w" "$h" windowmove "$center" "$y" &
xdotool search -name 'term2' windowactivate && { echo "term2 already running" ; } || \
(urxvt -title term2 & sleep "$sleep") && xdotool search --sync --name 'term2' windowactivate windowsize "$w" "$h" windowmove "$center" $((y + h + margin)) &
xdotool search -name 'term3' windowactivate && { echo "term3 already running" ; } || \
(urxvt -title term3 & sleep "$sleep") && xdotool search --sync --name 'term3' windowactivate windowsize "$w" "$h" windowmove "$center" $((y + 2 * h + 2 * margin))

wait

xdotool set_desktop "$desknow" # return me to original desktop

# notes:
# wmctrl -l < will list all visible window ids
# xdotool windowmove does not support percents, while windowsize does