#!/bin/bash

# if fvwm dies of either any signal other than SIGTERM or SIGINT ie
# with SEGV, SIGKILL, etc, then restart it.
# 
# 2 reasons you'd want to deliberately restart: 
#
# 1. want to restart with new config, and hence have to re-source
# these scripts.  Need a specialised restart handler, that still
# allows fvwm to create ~/.fs-restart state file, but does the
# necessary conversions first

# 2. fvwm has stuck in 100%CPU loop after running xine.  SIGUSR1
# restarts fvwm internally, which wont source the scripts we want it
# to source.  Don't care about that because haven't changed the
# config.  And the signal handler bug has been fixed now so works
# multiple times.

#set -xv

export wm=fvwm
while : ; do
    exec < /dev/null
    echo keepfvwmalive: $(date): running source-stratup-exec-fvwm which will try to start wm $wm
    bash -xv source-startup-exec-fvwm
    err=$?   #if just sigtermed, fvwm seems to give an exit code of 0.
#	export RESTARTINGFVWM=yes
#    set -xv
    ( echo $PATH ; date ; echo "$wm: $err" ) > $HOME/.fvwm-exit-code
#	if [ "$err" != 139 -a "$err" != 138 ] ; then
    if [ "$err" = 0 -o "$err" = 129 ] ; then   #If X killed, it gives 1 back, but then X kills us anyway

        # need to tell child loop to exit, otherwise there is no exit
        # condition, and it will keep looping despite everything else
        # dying

        echo -e "\nKILL CHILD $$\n$err"

#        exit $err

        # also need to kill the parent, because oterhwise everyone's
        # STDOUT/ERR is still going to remove_dup_in_small_window, so it never dies.
        # Still, removeup should have died when the child reader
        # exited prior to us killing parent, but that didn't seem to
        # work, so I suspect remove_dup_in_small_window is going to stick around
        # regardless...
        kill $PPID
    fi
    if [ "$wm" = fvwm ] ; then
        export wm=twm
    else
        export wm=fvwm
    fi
    cd / ; cd $HOME  # just in case NFS mount had gone stale
    sleep 1
done 2>&1 | grep --line-buffered -v '^$' | remove_dup_in_small_window | while read a ; do
    echo `date +"%Y-%m-%d %H:%M:%S:"` "$a" >> $HOME/.xsession-errors.$HOSTNAME$DISPLAY-fvwm.`date +%Y%m%d`
    find $HOME/.xsession-errors.$HOSTNAME$DISPLAY-fvwm.* -mtime +5 -exec rm '{}' ';'
    if [ "$a" = "KILL CHILD $$" ] ; then
        read a
        echo "Got sent command to die from parent: $a"
        exit $a
    fi
done