js9load

#!/bin/bash
# set -x

# in case the user has changed the js9 script, try to figure out the right one
# is this file a link?
BFILE="${BASH_SOURCE[0]}"
LFILE="$( readlink $BFILE )"
if [ x"$LFILE" != x ]; then
  XFILE="$LFILE"
else
  XFILE="$BFILE"
fi
# is the containing directory a link?
BDIR="$( dirname ${XFILE} )"
LDIR="$( readlink $BDIR )"
if [ x"$LDIR" != x ]; then
  XDIR="$LDIR"
else
  XDIR="$BDIR"
fi
# any more links we need to know about?
DIR="$( cd "${XDIR}" >/dev/null 2>&1 && pwd )"
if [ -r ${DIR}/js9 ]; then
  JS9=${DIR}/js9
else
  JS9=js9
fi

error() {
  echo "ERROR: $1" 1>&2
  exit 1
}

# local variables
DONE=false
VERBOSE=false
MAXTRIES=10
ETRIES=3
SLEEP=1

while [ x"$1" != x ]; do
    case $1 in
    -h) shift
	XARGS="$XARGS -h $1"
        shift;;

    -id|--id) shift
        XARGS="$XARGS --id $1"
	shift;;

    -s) shift
        SLEEP=$1
        shift;;

    -t) shift
        MAXTRIES=$1
        shift;;

    -v) VERBOSE=true
	shift;;

     *) break;;
    esac
done

# check for required args
if [ $# -lt 1 ]; then
  echo "usage:  $0 filename"
  exit 1
else
  PATHNAME="$1"
  shift
fi

# start the image load
GOT=`${JS9} $XARGS Load "$PATHNAME" $* `
if [ x"$GOT" != x ]; then
  error "$GOT"
fi

# wait for completion
TRIES=$MAXTRIES
while [ $DONE = false ]; do
  # get status of current image
  GOT=`${JS9} $XARGS GetLoadStatus "$PATHNAME"`
  case $GOT in
    error)
      error "could not load: $PATHNAME";;
    loading|please|other|none)
      # allow none once before error (might not have loaded enough image yet)
      if [ $GOT = none -a $TRIES != $MAXTRIES ]; then
          error "could not find: $PATHNAME"
      fi
      TRIES=`echo "$TRIES - 1" | bc`
      if [ $TRIES -le 0 ]; then
          error "timeout while loading: $PATHNAME"
      fi
      sleep $SLEEP
      if [ x$VERBOSE = xtrue ] ; then
        echo "loading [$TRIES] ..."
      fi
      continue;;
    complete)
      if [ x$VERBOSE = xtrue ] ; then
        echo "success!"
      fi
      DONE=true
      continue;;
    ERROR*)
      # look for race condition if js9 display is not ready
      echo "$GOT" | egrep "can't find JS9 display with id" 1>/dev/null 2>&1
      if [ $? = 0 ] ; then
        ETRIES=`echo "$ETRIES - 1" | bc`
        if [ $ETRIES -le 0 ]; then
          error "timeout awaiting display, or missing file: $PATHNAME"
        fi
        sleep $SLEEP
        if [ x$VERBOSE = xtrue ] ; then
          echo "waiting for display [$ETRIES] ..."
        fi
      else
        error "$GOT; could not load: $PATHNAME"
      fi
      continue;;
  esac
done

# signal success
exit 0