Re: [Gnuplot-info] Quit gnuplot when plot window is closed

[pjhoust <hou...@ro...>]

GIven: RHEL/CENTOS 6 with utilities xwininfo and xev

The following worked for me to create a window destruction notification
function within the script that I used to call gnuplot.  Call the function
with the name of your gnuplot graph window (yes, you have to name it and
make sure it's unique) and a process ID (usually that of the shell running
gnuplot) and background it.  When it detects that the given window has been
destroyed, it exits sending a SIGUSR1 signal to whatever PID you gave it. 
What you do with the signal is up to you but I just do a mass murder.


###############################################################################
#
# NAME
#   WinDestroyNotify
#
# SYNOPSIS
#   WinDestroyNotify WIN_NAME PID
#  
# DESCRIPTION
#       Waits for X window given by WIN_NAME to be destroyed then sends
#       SIGUSR1 to process given by PID
#
###############################################################################

WinDestroyNotify() {
        local WIN_NAME=$1
        local NOTIFY_PID=$2
        local FIFO="/tmp/WinDestroyNotify.$$.fifo"
        local winid_regex=".*id: ([^ ]*) .*"

        local WIN_ID=
        local LOOP_PID=
        local XEV_PID=

        [[ "$(xwininfo -name "$WIN_NAME" )" =~ ${winid_regex} ]] &&
                WIN_ID=${BASH_REMATCH[1]}

        mkfifo $FIFO >/dev/null 2>&1

        while read line
        do
                [[ $line =~ Destroy ]] && exit
        done <$FIFO &

        LOOP_PID=$!

        xev -id $WIN_ID > $FIFO &
        XEV_PID=$!

        wait $LOOP_PID
        kill $XEV_PID >/dev/null 2>&1
        rm -f $FIFO >/dev/null 2>&1
        kill -USR1 $NOTIFY_PID >/dev/null 2>&1
} 



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