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#!/bin/sh
# i3-get-window-criteria - Get criteria for use with i3 config commands
# To use, run this script, then click on a window.
# Output is in the format: [<name>=<value> <name>=<value> ...]
# Known problem: when WM_NAME is used as fallback for the 'title="<string>"' criterion,
# quotes in "<string>" are not escaped properly. This is a problem with the output of `xprop`,
# reported upstream: https://bugs.freedesktop.org/show_bug.cgi?id=66807
PROGNAME=$(basename "$0")
# Check for xwininfo and xprop
for cmd in xwininfo xprop; do
if ! which $cmd > /dev/null 2>&1; then
echo "$PROGNAME: $cmd: command not found" >&2
exit 1
fi
done
match_int='[0-9][0-9]*'
match_string='".*"'
match_qstring='"[^"\\]*(\\.[^"\\]*)*"' # NOTE: Adds 1 backreference
{
# Run xwininfo, get window id
window_id=$(xwininfo -int | sed -nre "s/^xwininfo: Window id: ($match_int) .*$/\1/p")
echo "id=$window_id"
# Run xprop, transform its output into i3 criteria. Handle fallback to
# WM_NAME when _NET_WM_NAME isn't set
xprop -id $window_id \
| sed -nr \
-e "s/^WM_CLASS\(STRING\) = ($match_qstring), ($match_qstring)$/instance=\1\nclass=\3/p" \
-e "s/^WM_WINDOW_ROLE\(STRING\) = ($match_qstring)$/window_role=\1/p" \
-e "/^WM_NAME\(STRING\) = ($match_string)$/{s//title=\1/; h}" \
-e "/^_NET_WM_NAME\(UTF8_STRING\) = ($match_qstring)$/{s//title=\1/; h}" \
-e '${g; p}'
} | sort | tr "\n" " " | sed -r 's/^(.*) $/[\1]\n/'
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