#!/bin/bash
#  toggle (run or kill) a utility program
#  e.g.  toggle xcalc

USAGE="$0 [-hkr] command
    -h     print help text
    -k     kill command
    -r     run command if it isn't running
    -v     be verbose
    command to run or kill
"
. $HOME/.xmonad/lib/ws-utils.sh

STRFTIME=%H:%M
KILL=false
RUN=false
VERB=false

case $1 in
    (-h) echo "$USAGE"; exit;;
    (-k) KILL=true; shift;;
    (-r)  RUN=true; shift;;
    (-v) VERB=true; shift;;
esac

# see whether a command is running
#     If the command is _not_ running, there will be 3 lines:
#     toggle, /bin/bash toggle, grep
isRunning () {
    n=$(ps x | grep "$*" | grep -v grep | grep -v toggle | grep -v /bin/sh | wc -l)
    $VERB && echo $n copies of "$*"
    $VERB && ps x | grep "$*"
    if [ 0 == $n ]; then false; else true; fi
}

# kill any running command with the same arguments
#      Not called "kill" because that would recurse.
stop () {
    pid=$(ps x | grep "$*" | grep -v grep | grep -v toggle | grep -v /bin/sh | first_number )
    $VERB && ps x | grep "$*" | grep -v grep | grep -v toggle 
    $VERB && echo about to kill $pid
    kill $pid
}

if isRunning $*; then
    $VERB && echo $* is running
    if $RUN; then :; else stop $*; fi
else
    $VERB && echo $* is not running
    if $KILL; then :; else $* </dev/null &>/dev/null & fi
fi