#!/bin/bash
#
# Trigger xfce4-screenshooter on PrtSc/SysRq key
# Doesn't consume the key!!
# Arguments, if given, is a command to use for processing the screenshot,
# instead of getting a dialog about it. The capture is added as an
# additional final argument, as a file in /tmp.
#
# Example for simply saving it in the ~/Pictures directory.
#   kbdo cp -t $HOME/Pictures
#
# Example for custom copying by inline scripting (same effect):
# kbdo 'bash -c "X(){ cp $1 $HOME/Pictures; }; X $1"' CP
#
# Note above, that bash needs CP as the $0 for the -c scripting
#
# Example for post-processing with convert into fix resolution
# kbdo 'bash -c "X(){ convert $1 -resize 800x600 ${1#.*}-x.png; }; X $1"' CVT
#
# Example for running custom script
#   kbdo $HOME/bin/mycp arg1 arg2
#
# Note above, that the temporary snapshot file is added as an additional
# last argument ("arg3" as it were); something like /tmp/Screenshot-date.png

ARGS="$*"
if [ -z "$ARGS" ] ; then
    PRG=( /usr/bin/xfce4-screenshooter -w )
else
    PRG=( /usr/bin/xfce4-screenshooter -w -o "$ARGS" )
fi

EVL=""

stdbuf -o0 xxd -c 24 -p < /dev/input/event0 | \
    stdbuf -o0 sed 's/.\{32\}//;s/\(.\{12\}\).*/\1/' | \
    while read EV ; do
	if [ "$EV" != "000000000000" ] ; then
	    EVL+=" $EV"
	    continue
	fi
	# echo "$EVL" >&2
	if [ -z "${EVL%%*010063000100}" ] ; then
	    # Act on the [PrtSc/SysRq] key
	    echo "${PRG[@]}" >&2
	    "${PRG[@]}" &
	fi
	EVL=""
    done