#!/usr/bin/bash

# differ.sh
# Created 8/5/2020  Meryll Larkin
# Remove empty lines and comment lines before diff'ing 2 files

file1=$1
file2=$2
pid=$$

# echo "file1 = $file1"
# echo "file2 = $file2"

if [ !  -f "$file2" ] ; then
    echo -n "Please provide first filename: "
    read file1
    echo -n "Please provide second filename: "
    read file2
fi

if [ ! -f "$file2" ] ; then
   echo "$file2 not found. Quitting"
   exit
fi
if [ ! -f "$file1" ] ; then
   echo "$file1 not found. Quitting"
   exit
fi

egrep -v '^\s*$' $file1 |egrep -v '^\s*#' >>/tmp/temp1_${pid}
egrep -v '^\s*$' $file2 |egrep -v '^\s*#' >>/tmp/temp2_${pid}

echo
read -p  "Diff verticle "V" or Side-by-side "S"  [V|s] : "  dift
difftype=${dift^}
echo "difftype = $difftype"
echo
if [[ $difftype == "V"* ]] ; then
   diff  /tmp/temp1_${pid} /tmp/temp2_${pid}
else
   diff -y -b /tmp/temp1_${pid} /tmp/temp2_${pid}
fi
echo
echo "Complete!"
echo
rm /tmp/temp1_${pid}
rm /tmp/temp2_${pid}
exit