mirror of https://github.com/yshui/picom.git
Rewrite picom-trans
Rewrite picom-trans (#634) Notable changes: * Support arguments like `--arg=val` * Allow trailing %-signs in opacity * Improve error message * Improve compatibility across different shells
This commit is contained in:
Subhaditya Nath
GitHub
parent
057a939431
commit
084b670f6a
511
bin/picom-trans
511
bin/picom-trans
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@ -2,12 +2,17 @@
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#
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# picom-trans
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# transset in a bash script
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# Copyright (c) 2011-2012, Christopher Jeffrey
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# Copyright (c) 2021, Subhaditya Nath
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# Based on previous works of Christopher Jeffrey
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#
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#
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# Conforming to POSIX-1.2007
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# https://pubs.opengroup.org/onlinepubs/9699919799
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#
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# Usage:
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# $ picom-trans [options] [+|-]opacity
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# $ picom-trans [options] [+|-]opacity
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# By window id
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# $ picom-trans -w "$WINDOWID" 75
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# By name
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@ -25,17 +30,31 @@
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# $ picom-trans -c --toggle 90
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# Reset all windows
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# $ picom-trans --reset
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print_usage() {
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echo "Usage: $0 [options] [+|-]opacity"
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# Save $0 now to print correct value while printing from functions.
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# Printing errormsgs from functions using "$0" prints the function name
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# instead of the executable name.
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EXE_NAME="$0"
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# Instead of printing the full path to this file (e.g. /usr/bin/picom-trans)
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# only print the base name (i.e. picom-trans)
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EXE_NAME="$(basename "$EXE_NAME")"
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print_usage()
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{ #{{
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echo "Usage: $EXE_NAME [options] [+|-]opacity"
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echo ""
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echo "Options:"
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echo " -h, --help Print this help message."
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echo " -o, --opacity OPACITY Specify the new opacity value in range 1-100 for the window. If"
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echo " prefixed with + or -, increment or decrement from the target"
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echo " window’s current opacity."
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echo " -o, --opacity OPACITY Specify the new opacity value in range 0-100 for the window. If"
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echo " prefixed with + or -, increment or decrement from the current"
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echo " opacity of the target window."
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echo ""
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echo "Actions:"
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echo " -g, --get Print the target window's opacity."
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echo " -g, --get Print current opacity of the target window."
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echo " -d, --delete Delete opacity of the target window."
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echo " -t, --toggle Toggle the target window's opacity, i.e. set if not already set"
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echo " and delete else."
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@ -46,194 +65,342 @@ print_usage() {
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echo " -c, --current Select the currently active window as target."
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echo " -n, --name WINDOW_NAME Specify and try to match a window name."
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echo " -w, --window WINDOW_ID Specify the window id of the target window."
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}
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} #}}
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case "$0" in
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*compton-trans*) echo "Warning: compton has been renamed, please use picom-trans instead" >& 2;;
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esac
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# "command" is a shell built-in, faster than "which"
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if test -z "$(command -v xprop)" -o -z "$(command -v xwininfo)"; then
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echo 'The command xwininfo or xprop is not available. They might reside in a package named xwininfo, xprop, x11-utils, xorg-xprop, or xorg-xwininfo.' >& 2
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exit 1
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fi
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if test $# -eq 0; then
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print_usage >& 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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action=
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treeout=
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wid=
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topmost=
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lineno=
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option=
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v=
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# We make getopts stop on any argument it doesn't recognize
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# or errors on. This allows for things like `picom-trans -5`
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# as well as `picom-trans -c +5 -s` (contrived example).
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while test $# -gt 0; do
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# Reset option index
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OPTIND=1
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# Read options
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while getopts ':hscrtdgn:w:o:-:' option "$@"; do
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if test "$option" = '-'; then
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case "$OPTARG" in
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help | select | current | reset | toggle | delete | get)
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v=''
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;;
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name | window | opacity)
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eval v=\$$OPTIND
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OPTIND=$((OPTIND + 1))
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;;
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name=* | window=* | opacity=*)
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v=$(echo "$OPTARG" | sed -E 's/^[^=]+=//')
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;;
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*)
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echo "$0: illegal option $OPTARG" >& 2
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exit 1
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;;
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parse_args()
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{ #{{
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i=1 # because we start from "$1", not from "$0"
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while [ $i -le $# ]
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do
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#### [START] Convert GNU longopts to POSIX equivalents ####
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if [ "$1" = "--${1##--}" ] # check if $1 is a longopt
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then
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# Catch invalid options
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case "$1" in
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(--opacity=|--name=|--window=)
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echo "$EXE_NAME: option ${1%=} needs a value" >&2
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exit 1;;
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(--opacity|--name|--window)
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test $i -eq $# \
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&& echo "$EXE_NAME: option $1 needs a value" >&2 \
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&& exit 1;;
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esac
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# Separate "--ARG=VAL" into "--ARG" "VAL"
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case "$1" in
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(--opacity=*|--name=*|--window=*)
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ARG="$(echo "$1" | sed -E 's/(--[^=]+)=.*$/\1/')"
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VAL="${1##${ARG}=}"
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shift && set -- "$ARG" "$VAL" "$@"
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esac
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# Turn into short form
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case "$1" in
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(--help|--opacity|--get|--delete|--toggle|--reset|--select|--current|--name|--window)
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ARG=${1#-} # remove one '-' from prefix
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ARG="$(echo "$ARG" | cut -c -2)" # get first two characters
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shift && set -- "$ARG" "$@"
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esac
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# If the argument still starts with --, it is an invalid argument
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case "$1" in
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(--*)
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echo "$EXE_NAME: illegal option $1" >&2
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exit 1
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esac
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option=$(echo "$OPTARG" | cut -c 1)
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OPTARG=$v
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fi
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case "$option" in
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h) print_usage; exit 0 ;;
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s) wprefix=''; window='' ;;
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c)
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active=$(xprop -root -notype _NET_ACTIVE_WINDOW \
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| grep -Eo '0x[[:xdigit:]]+' | head -n 1)
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wprefix='-id'; window=$active
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;;
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r) action='reset' ;;
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t) action='toggle' ;;
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d) action='delete' ;;
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g) action='get' ;;
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n) wprefix='-name'; window=$OPTARG ;;
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w) wprefix='-id'; window=$OPTARG ;;
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o) opacity=$OPTARG ;;
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\?) break ;;
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#### [END] Convert GNU longopts to POSIX equivalents ####
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#### [START] Prepend '-o' to standalone opacity values ####
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# Iterate over every argument and check if it is an opacity without the -o
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# option in the previous argument. If so, then prepend the -o option.
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# e.g. Turn this -
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# picom-trans -c +10 -s
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# into this -
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# picom-trans -c -o +10 -s
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#
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# NOTE: Don't touch arguments that are preceded by -o, -w, or -n (i.e. the
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# options that take a value.)
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# e.g. This -
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# picom-trans -w 75 -o 90
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# should NOT be turned into this -
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# picom-trans -w -o 75 -o 90
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# We ensure this by checking the "$#"th (i.e. the last) argument. If
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# argument is an option that needs a value, we don't do anything to $1.
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#
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# NOTE: we are using printf because most echo implementations aren't
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# POSIX-compliant. For example, according to POSIX.1-2017, echo doesn't
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# support any options, so,
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# $ echo "-n"
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# should output -
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# -n
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# But it doesn't. It instead interprets the "-n" as the option -n, which,
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# in most implementations, means that the trailing newline should not be
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# printed.
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if echo "$1" | grep -qE '^[+-]?[[:digit:]]+%?$' && \
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! eval "printf '%s' \"\${$#}\"" | grep -q '^-[hdtrgsc]*[own]$'
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# NOTE: eval "printf '%s' \"\${$#}\"" means 'print the last argument'
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# NOTE: The letters inside the first square brackets (ie. hdtrgsc) are
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# the same as those in the getopts argument, minus those that are
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# followed by a ':'
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# NOTE: The letters inside the second square brackets (ie. own) are
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# the same as those in the getopts argument, minus those that are
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# NOT followed by a ':'
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then
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set -- "$@" "-o"
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i=$(( i + 1 ))
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fi
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#### [END] Prepend '-o' to standalone opacity values ####
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# Prepare for next iteration
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ARG="$1"
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shift && set -- "$@" "$ARG"
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i=$(( i + 1 ))
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done
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# NOTE: DO NOT ATTEMPT TO USE "$OPTIND" INSIDE THE getopts LOOP
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# - https://github.com/yshui/picom/pull/634#discussion_r654571535
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# - https://www.mail-archive.com/austin-group-l%40opengroup.org/msg04112.html
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OPTIND=1
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while getopts 'ho:dtrgsn:w:c' OPTION
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do
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case "$OPTION" in
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(h) print_usage; exit 0;;
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(o) target_opacity="$OPTARG";;
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(d) action=delete;;
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(t) action=toggle;;
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(r) action=reset;;
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(g) action=get;;
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(s) winidtype=; winid=;;
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(n) winidtype=-name; winid="$OPTARG";;
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(w) winidtype=-id; winid="$OPTARG";;
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(c) winidtype=-id; winid="$(get_focused_window_id)";;
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(\?) exit 1
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esac
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done
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} #}}
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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 "$opacity" | xargs | sed 's/%//g')
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get_target_window_id()
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{ #{{
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# Validate opacity value
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if test -z "$action" && ! echo "$opacity" | grep -qE '^[+-]?[0-9]+$'; then
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echo "Invalid opacity specified: $opacity."
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exit 1
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fi
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# Get the output of xwininfo
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if test -z "$winidtype"
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then xwininfo_output="$(xwininfo -children -frame)"
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elif test "$winidtype" = "-name"
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then xwininfo_output="$(xwininfo -children -name "$winid")"
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elif test "$winidtype" = "-id"
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then
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# First, check if supplied window id is valid
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if ! echo "$winid" | grep -Eiq '^[[:space:]]*(0x[[:xdigit:]]+|[[:digit:]]+)[[:space:]]*$'
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then
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echo "Bad window ID" >&2
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exit 1
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fi
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xwininfo_output="$(xwininfo -children -id "$winid")"
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fi
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# Reset opacity for all windows
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if test x"$action" = x'reset'; then
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xwininfo -root -tree \
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| sed -n 's/^ \(0x[[:xdigit:]]*\).*/\1/p' \
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| while IFS=$(printf '\n') read wid; do
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xprop -id "$wid" -remove _NET_WM_WINDOW_OPACITY
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done
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exit 0
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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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test "$wprefix" = '-id' \
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&& ! echo "$window" | grep -Eiq '^[[:space:]]*(0x[[:xdigit:]]+|[[:digit:]]+)[[:space:]]*$' \
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&& echo 'Bad window ID.' && exit 1
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treeout=$(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 "$treeout"; then
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echo 'Failed to get root window tree.'
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# Extract window id from xwininfo output
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winid="$(echo "$xwininfo_output" | sed -n 's/^xwininfo:.*: \(0x[[:xdigit:]]*\).*$/\1/p')"
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if test -z "$winid"
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then
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echo "Failed to find window" >&2
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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 "^\s*$wid" | head -n1 | cut -d ':' -f 1)
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if test -z "$lineno"; then
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echo 'Failed to find window in window tree.'
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# Make sure it's not root window
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if echo "$xwininfo_output" | grep -Fq "Parent window id: 0x0"
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then
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echo "Cannot set opacity on root window" >&2
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exit 1
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fi
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# Find the highest ancestor of the target window below
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topmost=$(echo -n "$treeout" \
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| head -n $lineno \
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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 it's not the topmost window, get the topmost window
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if ! echo "$xwininfo_output" | grep -q 'Parent window id: 0x[[:xdigit:]]* (the root window)'
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then
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window_tree="$(xwininfo -root -tree)"
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if test -z "$window_tree"
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then
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echo "Failed to get root window tree" >&2
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exit 1
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fi
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if test -z "$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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# Find the highest ancestor of the target window
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winid="$(echo "$window_tree" \
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| sed -n "/^\s*$winid/q;s/^ \(0x[[:xdigit:]]*\).*/\1/p" \
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| tail -n 1)"
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if test -z "$winid"
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then
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echo "Failed to find window in window tree" >&2
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exit 1
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fi
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fi
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if test -z "$winid"
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then
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echo "Failed to find the highest parent window below root of the selected window" >&2
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exit 1
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fi
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# Get current opacity.
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cur=$(xprop -id "$topmost" -notype _NET_WM_WINDOW_OPACITY \
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| sed -E 's/^_NET_WM_WINDOW_OPACITY = ([0-9]*)$|^.*$/\1/')
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echo "$winid"
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} #}}
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# Remove the opacity property.
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if test x"$action" = x'delete' -o \( x"$action" = x'toggle' -a -n "$cur" \); then
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xprop -id "$topmost" -remove _NET_WM_WINDOW_OPACITY
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exit 0
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fi
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get_focused_window_id()
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{ #{{
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id="$(xprop -root -notype -f _NET_ACTIVE_WINDOW 32x '$0' _NET_ACTIVE_WINDOW)"
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echo "${id#_NET_ACTIVE_WINDOW}"
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} #}}
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# Unset opacity equals fully opaque
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test -z "$cur" && cur=0xffffffff
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cur=$((cur * 100 / 0xffffffff))
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get_current_opacity()
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{ #{{
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# Gets current opacity in the range 0-100
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# Doesn't output anything if opacity isn't set
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cur="$(xprop -id "$winid" -notype -f _NET_WM_WINDOW_OPACITY 32c '$0' _NET_WM_WINDOW_OPACITY)"
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cur="${cur#_NET_WM_WINDOW_OPACITY}"
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cur="${cur%:*}"
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test -n "$cur" &&
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cur=$(( cur * 100 / 0xffffffff ))
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echo "$cur"
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} #}}
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# Output current opacity.
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if test x"$action" = x'get'; then
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get_opacity()
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{ #{{
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cur="$(get_current_opacity)"
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test -z "$cur" && cur=100 # Unset opacity means fully opaque
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echo "$cur"
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exit 0
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} #}}
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delete_opacity()
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{ #{{
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xprop -id "$winid" -remove _NET_WM_WINDOW_OPACITY
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exit 0
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} #}}
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reset_opacity() # Reset opacity of all windows
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{ #{{
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for winid in $(xwininfo -root -tree | sed -n 's/^ \(0x[[:xdigit:]]*\).*/\1/p')
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do xprop -id "$winid" -remove _NET_WM_WINDOW_OPACITY 2>/dev/null
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done
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exit 0
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} #}}
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set_opacity()
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{ #{{
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if ! echo "$target_opacity" | grep -qE '^[+-]?[[:digit:]]+%?$'
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then
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if test -z "$target_opacity"
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then echo "No opacity specified" >&2
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else echo "Invalid opacity specified: $target_opacity" >&2
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fi
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exit 1
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fi
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# strip trailing '%' sign, if any
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target_opacity="${target_opacity%%%}"
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if echo "$target_opacity" | grep -q '^[+-]'
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then
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current_opacity="$(get_current_opacity)"
|
||||
test -z "$current_opacity" && current_opacity=100
|
||||
target_opacity=$(( current_opacity + target_opacity ))
|
||||
fi
|
||||
|
||||
test $target_opacity -lt 0 && target_opacity=0
|
||||
test $target_opacity -gt 100 && target_opacity=100
|
||||
|
||||
target_opacity=$(( target_opacity * 0xffffffff / 100 ))
|
||||
xprop -id "$winid" -f _NET_WM_WINDOW_OPACITY 32c \
|
||||
-set _NET_WM_WINDOW_OPACITY "$target_opacity"
|
||||
|
||||
exit $?
|
||||
} #}}
|
||||
|
||||
toggle_opacity()
|
||||
{ #{{
|
||||
# If opacity is currently set, unset it.
|
||||
# If opacity is currently unset, set opacity to the supplied value. If no
|
||||
# value is supplied, we default to 100%.
|
||||
if test -z "$(get_current_opacity)"
|
||||
then
|
||||
test -n "$target_opacity" || target_opacity=100
|
||||
set_opacity
|
||||
else
|
||||
delete_opacity
|
||||
fi
|
||||
} #}}
|
||||
|
||||
|
||||
# Warn about rename of compton to picom
|
||||
case "$0" in
|
||||
*compton-trans*) echo "Warning: compton has been renamed, please use picom-trans instead" >&2;;
|
||||
esac
|
||||
|
||||
|
||||
# Check if both xwininfo and xprop are available
|
||||
if ! command -v xprop >/dev/null || ! command -v xwininfo >/dev/null
|
||||
then
|
||||
echo "The command xwininfo or xprop is not available. They might reside in a package named xwininfo, xprop, x11-utils, xorg-xprop, or xorg-xwininfo" >&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
# Calculate the desired opacity
|
||||
if echo "$opacity" | grep -q '^[+-]'; then
|
||||
opacity=$((cur + opacity))
|
||||
|
||||
# No arguments given. Show help.
|
||||
if test $# -eq 0
|
||||
then
|
||||
print_usage >&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
test $opacity -lt 0 && opacity=0
|
||||
test $opacity -gt 100 && opacity=100
|
||||
|
||||
# Set opacity
|
||||
opacity=$((opacity * 0xffffffff / 100))
|
||||
xprop -id "$topmost" -f _NET_WM_WINDOW_OPACITY 32c \
|
||||
-set _NET_WM_WINDOW_OPACITY "$opacity"
|
||||
# Variables
|
||||
# action is set to 'set' by default
|
||||
action=set
|
||||
winid=
|
||||
winidtype=
|
||||
target_opacity=
|
||||
|
||||
# If there's only one argument, and it's a valid opacity
|
||||
# then take it as target_opacity. Else, parse all arguments.
|
||||
if test $# -eq 1 && echo "$1" | grep -qE '^[+-]?[[:digit:]]+%?$'
|
||||
then
|
||||
target_opacity=$1
|
||||
shift
|
||||
else
|
||||
parse_args "$@"
|
||||
fi
|
||||
|
||||
|
||||
# reset_opacity doesn't need $winid
|
||||
case $action in
|
||||
(reset) reset_opacity;;
|
||||
esac
|
||||
|
||||
# Any other action needs $winid
|
||||
#
|
||||
# NOTE: Do NOT change the order of winid= and winidtype= below
|
||||
# the output of get_target_window_id depends on $winidtype
|
||||
#
|
||||
# NOTE: If get_target_window_id returns with a non-zero $?
|
||||
# that must mean that some error occured. So, exit with that same $?
|
||||
#
|
||||
winid=$(get_target_window_id) || exit $?
|
||||
winidtype=-id
|
||||
case $action in
|
||||
(set) set_opacity;;
|
||||
(get) get_opacity;;
|
||||
(delete) delete_opacity;;
|
||||
(toggle) toggle_opacity;;
|
||||
esac
|
||||
|
||||
|
||||
# We should never reach this part of the file
|
||||
echo "This sentence shouldn't have been printed. Please file a bug report." >&2
|
||||
exit 128
|
||||
|
||||
|
||||
# vim:ft=sh:ts=4:sts=4:sw=2:et:fdm=marker:fmr=#{{,#}}:nowrap
|
||||
|
|
|
|||
Loading…
Reference in New Issue