make java exception messages readable

format_java_exception.sh

#!/bin/bash

##
## patterns copied from 
##   https://raw.githubusercontent.com/staxmanade/ExceptionMessageBeautifier/master/src/ExceptionMessageBeautifier.js 
## see also:
##   https://superuser.com/a/747905
##

PERL_CMD="perl -pe 's/   at/\\r\\n   at/g; s/ ---> /\\r\\n ---> /g; s/\) at /\\r\\n at /g; s/ --- End of inner exception stack trace ---/\\r\\n   --- End of inner exception stack trace ---/g;'"

FILE_IN="$1"

if [ -p /dev/stdin ]; then
  while IFS= read INPUT; do 
    cat ${INPUT} | ${PERL_CMD}
  done
else
  if [ -f $FILE_IN ]; then 
    cat ${FILE_IN} | ${PERL_CMD}
  else 
    echo -e "\n  no input submitted.\n  syntax:\n   $0 {FILE}\n   cat {FILE} | $0\n\n"
  fi
fi