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163 lines
4 KiB
Bash
Executable file
163 lines
4 KiB
Bash
Executable file
#!/bin/sh
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#
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# compton-trans
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# transset in a bash script
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# Copyright (c) 2011-2012, Christopher Jeffrey
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#
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# Usage:
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# $ compton-trans [options] [+|-]opacity
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# By window id
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# $ compton-trans -w "$WINDOWID" 75
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# By name
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# $ compton-trans -n "urxvt" 75
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# By current window
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# $ compton-trans -c 75
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# By selection
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# $ compton-trans 75
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# $ compton-trans -s 75
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# Increment current window 5%
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# $ compton-trans -c +5
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# "command" is a shell built-in, faster than "which"
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if test -z "$(command -v xprop)" -o -z "$(command -v xwininfo)"; then
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echo 'Please install x11-utils/xorg-xprop/xorg-xwininfo.' >& 2
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exit 1
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fi
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# Variables
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active=
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wprefix=
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window=
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opacity=
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cur=
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delete=
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treeout=
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wid=
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topmost=
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lineno=
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# This takes into account the fact that getopts stops on
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# any argument it doesn't recongize or errors on. This
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# allows for things like `compton-trans -5` as well
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# as `compton-trans -c +5 -s` (contrived example).
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while test $# -gt 0; do
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# Reset option index
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OPTIND=1
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LASTIND=1
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# Read options
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while getopts ':scdn:w:o:' option "$@"; do
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case "$option" in
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s) wprefix=''; window='' ;;
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c)
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active=$(xprop -root -notype _NET_ACTIVE_WINDOW \
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| sed 's/^.*\(0x\S*\).*$/\1/')
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wprefix='-id'; window=$active
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;;
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d) delete=1 ;;
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n) wprefix='-name'; window=$OPTARG ;;
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w) wprefix='-id'; window=$OPTARG ;;
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o) opacity=$OPTARG ;;
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\?)
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# For some reason single char options `-x` stop on the OPTIND after the
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# argument index, whereas two or more character options (`-foo`) stop
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# on the argument's index, so we use LASTIND here instead. If OPTIND is
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# not equal to LASTIND, this means -x was used instead of -xx.
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OPTIND=$LASTIND
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break
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;;
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esac
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LASTIND=$OPTIND
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done
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# Read positional arguments
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shift $((OPTIND - 1))
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test -n "$1" && opacity=$1 && shift
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done
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# clean up opacity. xargs == a poor man's trim.
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opacity=$(echo "$opacity" | sed 's/%//g' | xargs)
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# Validate opacity value
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if test -z "$delete" && ! echo "$opacity" | grep -q '^[+-]\?[0-9]\+$'; then
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echo "Invalid opacity specified: $opacity."
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exit 1
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fi
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# Get ID of the target window
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if test -z "$wprefix"; then
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treeout=$(xwininfo -children -frame)
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else
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treeout=$(xwininfo -children $wprefix "$window")
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fi
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wid=$(echo "$treeout" | sed -n 's/^xwininfo:.*: \(0x[[:xdigit:]]*\).*$/\1/p')
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if test -z "$wid"; then
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echo 'Failed to find window.'
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exit 1
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fi
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# Make sure it's not root window
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if echo "$treeout" | fgrep -q 'Parent window id: 0x0'; then
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echo 'Cannot set opacity on root window.'
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exit 1
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fi
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# If it's already the topmost window
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if echo "$treeout" | grep -q 'Parent window id: 0x[[:xdigit:]]* (the root window)'; then
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topmost=$wid
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else
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# Get the whole window tree
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treeout=$(xwininfo -root -tree)
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if test -z "$treeout"; then
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echo 'Failed to get root window tree.'
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exit 1
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fi
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# Find the line number of the target window in the window tree
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lineno=$(echo -n "$treeout" | grep -nw "$wid" | head -n1 | cut -d ':' -f 1)
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if test -z "$lineno"; then
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echo 'Failed to find window in window tree.'
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exit 1
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fi
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# Find the highest ancestor of the target window below
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topmost=$(echo -n "$treeout" \
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| head -n $(($lineno + 1)) \
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| sed -n 's/^ \(0x[[:xdigit:]]*\).*/\1/p' \
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| tail -n 1)
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fi
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if test -z "$topmost"; then
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echo 'Failed to find the highest parent window below root of the' \
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'selected window.'
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exit 1
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fi
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# Remove the opacity property.
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if test -n "$delete"; then
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xprop -id "$topmost" -remove _NET_WM_WINDOW_OPACITY
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exit 0
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fi
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# Calculate the desired opacity
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if echo "$opacity" | grep -q '^[+-]'; then
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cur=$(xprop -id "$topmost" -notype _NET_WM_WINDOW_OPACITY \
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| sed 's/^.*\b\([0-9]\+\).*$\|^.*$/\1/')
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test -z "$cur" && cur=0xffffffff
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cur=$((cur * 100 / 0xffffffff))
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opacity=$(($cur + $opacity))
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fi
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test $opacity -lt 0 && opacity=0
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test $opacity -gt 100 && opacity=100
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# Set opacity
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opacity=$((opacity * 0xffffffff / 100))
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xprop -id "$topmost" -f _NET_WM_WINDOW_OPACITY 32c \
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-set _NET_WM_WINDOW_OPACITY "$opacity"
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