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#!/bin/sh
WORD=""
DICT="/usr/share/dict/words"
ARGC=0
usage() {
cat << EOF
usage: $0 [-h] [-w word] [-d file]
options:
-w set word to \`word\`
-d read dictionary from \`file\` ($DICT by default)
-h show help
EOF
exit $1
}
while getopts d:w:h OPT; do
[ $OPTIND -gt $ARGC ] && ARGC=$OPTIND
case $OPT in
h) usage 0 ;;
w) WORD=$OPTARG ;;
d) DICT=$OPTARG ;;
\?|*) usage 1 ;;
esac
done
if [ -z "$WORD" ]; then
# check if dictionary file exists
[ ! -e "$DICT" ] && echo "dictionary file doesn't exist!" && exit 1
# check if dictionary file is a regular file (not directory, block device, etc.)
[ ! -f "$DICT" ] && echo "dictionary file isn't a regular file!" && exit 1
# check if dictionary file contains at least one line
[ ! "`wc -l "$DICT" | cut -d' ' -f1`" -gt "0" ] && echo "dictionary file is empty!" && exit 1
# filter words containing apostrophe or space, or words longer than 12 characters
WORD="`sed -e "/[' ]/d" -e '/.\{13\}/d' "$DICT" | sort -R | head -n1`"
# check if word is empty
[ -z "$WORD" ] && echo "no usable words found in dictionary" && exit 1
fi
# convert word to lowercase
WORD="`echo "$WORD" | tr '[:upper:]' '[:lower:]'`"
pre_exit() {
trap - EXIT # prevent double exit trigger
echo ""
echo "the word was $WORD"
exit
}
# run pre_exit function on interrupt (Ctrl-C)
trap pre_exit INT
# main game loop (written in awk)
tput clear # clear screen
tput cup `stty size | cut -f1 -d' '` # move cursor to bottom left corner
$0.awk -vword="$WORD"
pre_exit
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