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prezto/modules/notify/functions/focused_window_id

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# Gets the id of the current focused window.
#
# Authors:
# Alex Reece <awreece@gmail.com>
#
case "$OSTYPE" in
(darwin*)
osascript -e 'tell application "System Events" to ¬' \
-e ' set focus_app_name to ¬' \
-e ' name of first application process ¬' \
-e ' whose frontmost is true' \
-e 'tell application focus_app_name to ¬' \
-e ' get id of front window'
;;
(linux-gnu*)
# http://stackoverflow.com/a/8688624/447288
xprop -root -f _NET_ACTIVE_WINDOW 0x ' $0' _NET_ACTIVE_WINDOW \
| awk '{print $2}'
;;
(*)
return 1
;;
esac