#!/bin/bash

# Usage: fstview [files...]

umask 077   # files in ugrad /tmp dir shouldn't be readable by other students

if [[ $# == 0 ]]; then
   STDINFILE=/tmp/stdin.$$.fst
   cat > $STDINFILE
fi
for FSTFILE in "$@" $STDINFILE; do
   echo === $FSTFILE ===
   fstinfo "$FSTFILE"                  # print info about the FST
   FSTBASE=${FSTFILE%.*}               # remove filename extension
   PDFFILE=/tmp/${FSTBASE##*/}.$$.pdf  # target name of pdf file in /tmp directory
   fstdraw --portrait "$FSTFILE" | dot -Tpdf > "$PDFFILE"   # make pdf file
   echo "Trying to show $PDFFILE ... if you are running this script on a"
   echo "remote machine, this may still work if you connect using ssh -Y."
   echo "Otherwise, use scp to copy $PDFFILE to your local machine."
   echo "For a different file format, modify fstview (change \"pdf\" to \"svg\" or \"png\""
   echo "or another popular image file extension) and change the viewing command."
   if command -v xreader >/dev/null; then
      xreader "$PDFFILE"                   # view pdf file
   else
      evince "$PDFFILE"                    # an alternative viewer
   fi
   echo
done