Trying to add options to this script, not quite working - bash

Question

I started with this script called wd:
cat "$#" | tr -cs '[:alpha:]' '\n' | tr '[:upper:]' '[:lower:]'
| sort | uniq -c | sort -n | awk '{print $2 " " $1}' | sort
That takes any number of files as input and prints a distribution of the words in the file like this:
wd file1 file2
blue 2
cat 3
the 5
yes 1
Now I'm trying to add 2 options to it: s and t. s causes the script to take an input file called stopwords, and deletes those words from the input file before making the distribution. t takes a number n as an argument and only outputs the top n words. Default is all words.
So, so far I have this script. Currently, my problem is when I try to use a -t 10 option for example, it tells me it cannot find the file 10, but it should be a number anyway, not a file. And, when I try to use the -s option, it simply does nothing, but does not output any error. I know this question isn't very specific, but I would appreciate any ideas on what's wrong.
#!/bin/bash
stopwords=FALSE
stopfile=""
topwords=0
while getopts s:t: option
do
case "$option"
in
s) stopwords=TRUE
stopfile="$OPTARG";;
t) topwords=$OPTARG;;
\?) echo "Usage: wd [-s stopfile] [-t n] inputfile"
echo "-s takes words in stopfile and removes them from inputfile"
echo "-t means to output only top n words"
exit 1;;
esac
done
if [ "stopwords" = FALSE ]
then
cat "$#" | tr -cs '[:alpha:]' '\n' | tr '[:upper:]' '[:lower:]'
| sort | uniq -c | sort -nr | head -n $topwords | awk '{print $2 " " $1}' | sort
else
cat "$#" | grep -v -f "$stopfile" | tr -cs '[:alpha:]' '\n' | tr '[:upper:]' '[:lower:]'
| uniq -c | sort -nr | head -n $topwords | awk '{print $2 " " $1}' | sort
fi

Answer 1

Usually after the while getopts loop you need to shift $((OPTIND - 1)). Following is an example I wrote before for both ksh and bash:
PROGNAME=$0
function _echo
{
printf '%s\n' "$*"
}
function usage
{
cat << END
usage: $PROGNAME [-a] [-b arg] [-h] file...
END
exit $1
}
function parseargs
{
typeset opt v
[[ $# = 0 ]] && usage 1
while getopts ":ab:h" opt "$#"; do
case $opt in
a) _echo -$opt ;;
b) _echo -$opt $OPTARG ;;
h) usage ;;
:) _echo "! option -$OPTARG wants an argument" ;;
'?') _echo "! unkown option -$OPTARG" ;;
esac
done
shift $((OPTIND - 1))
for v in "$#"; do
_echo "$v"
done
}
parseargs "$#"