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@chjj chjj/trans.sh
Created Nov 6, 2011

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setting transparency from bash
#!/bin/bash
# transset in a bash script
# copyright (c) 2011, christopher jeffrey
# usage:
# by window id
#trans -w "$WINDOWID" -o 75
# by name
#trans -n "urxvt" -o 75
# by current window
#trans -c -o 75
# by selection
#trans -s -o 75
[ -z "$(which xprop)" ] && \
echo "Please install x11-utils/xorg-xprop."
window=
opacity=
cur=
root=
parent=
active=
while getopts "scn:w:o:" OPTION; do
case "$OPTION" in
s) window="" ;;
c)
active=$(xprop -root -notype \
| grep "_NET_ACTIVE_WINDOW:" \
| sed 's/^.*\(0x\S*\).*$/\1/')
window="-id $active"
;;
n) window="-name $OPTARG" ;;
w) window="-id $OPTARG" ;;
o) opacity="$OPTARG" ;;
esac
done
parent=$(xwininfo -all $window \
| grep Parent \
| sed 's/^.*\(0x\S*\).*$/\1/')
root=$(xwininfo -all -root \
| grep "Root window id" \
| sed 's/^.*\(0x\S*\).*$/\1/')
if [ "$parent" != "$root" ]; then
window="-id $parent"
fi
inc=$(echo "$opacity" | sed 's/^\(+\|-\).*$\|^.*$/\1/')
if [ -n "$inc" ]; then
cur=$(xprop $window -notype "_NET_WM_WINDOW_OPACITY" \
| sed 's/^.*\([0-9]\+\).*$\|^.*$/\1/')
[ -z "$cur" ] && cur=$((0xffffffff))
cur=$((cur*100/0xffffffff))
opacity=$(echo "$opacity" | sed 's/\(\+\|\-\)//')
if [ "$inc" = "+" ]; then
opacity=$((cur+opacity))
else
opacity=$((cur-opacity))
fi
fi
if [ -n "$opacity" ] && [ -n "$window" ]; then
[ $opacity -le 0 ] && opacity=0
[ $opacity -ge 100 ] && opacity=100
opacity=$((opacity*0xffffffff/100))
xprop $window -f _NET_WM_WINDOW_OPACITY 32c \
-set _NET_WM_WINDOW_OPACITY "$opacity"
fi
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