#!/usr/bin/sh -e
-# Fortune implementation in awk
+# Fortune implementation in POSIX sh/awk
-usage()
-{
- echo "Usage: fortune [OPTIONS]
+usage() {
+ echo 'Usage: fortune [OPTIONS]
a simple POSIX sh/awk implementation of fortune
- -h, --help show this help message
- -l, --list list cookie files installed to /usr/share/fortune/
- -f \$FILE, --file \$FILE specify full path to cookie file
- -c \$FILE, --cookie \$FILE specify path to cookie file relative
- to /usr/share/fortune/
-"
+ -h, --help show this help message
+ -l, --list list installed cookie files
+ -c FILE, --cookie FILE specify cookie file
+ -n LENGTH, --min LENGTH specify min fortune length
+ -N LENGTH, --max LENGTH specify max fortune length
+
+ fortune looks for fortunes in $FORTUNEDIR, which defaults to
+ /usr/share/fortune.
+
+Exit codes:
+ 0 success
+ 1 generic error
+ 2 argument parsing error'
+}
+
+parse_err() {
+ echo "$1"
+ $2
+ exit 2
}
-FILE="$(find /usr/share/fortune/ -type f -not -name '*.dat')"
+DIR=${FORTUNEDIR:-"/usr/share/fortune/"}
+FILE="$(find $DIR -type f -not -name '*.dat')"
+MAXLENGTH=1000000000000
+MINLENGTH=0
+
while [ "$1" != "" ]; do
case $1 in
-h | --help)
usage
exit
;;
- -f | --file)
- FILE=$2
- ;;
-c | --cookie)
- FILE=/usr/share/fortune/$2
+ FILE=$DIR/$2
+ ;;
+ -n | --min)
+ MINLENGTH=$2
+ ;;
+ -N | --max)
+ MAXLENGTH=$2
;;
-l | --list)
- ls -1 /usr/share/fortune
+ ls -1 $DIR
exit
;;
*)
- echo "ERROR: unknown parameter \"$2\""
- usage
- exit 1
+ parse_err "ERROR: unknown option \"$1\"" usage
;;
esac
shift 2
done
-awk 'BEGIN {
+[ "$MAXLENGTH" -lt "$MINLENGTH" ] && {
+ parse_err "ERROR: maximum length is less than minimum length"
+}
+
+[ -d "$FILE" ] && {
+ parse_err "ERROR: directory given, please provide a file or glob of files"
+}
+
+[ "$(find $FILE -maxdepth 1 -print -quit 2> /dev/null)" ] || {
+ parse_err "ERROR: no such file or directory"
+}
+
+awk -v maxlen=$MAXLENGTH -v minlen=$MINLENGTH \
+'BEGIN {
f++
}
$1 == "%" {
- f++
+ len = length(fortunes[f])
+ if ( len>maxlen || len<minlen ) {
+ fortunes[f] = ""
+ } else {
+ f++
+ }
}
{
}
END {
- "date +%N" | getline time
- srand(time)
- print fortunes[int(rand() * f-2) + 2]
+ "od -A n -t d -N 3 /dev/urandom" | getline seed
+ srand(seed)
+ print fortunes[int(rand() * (f - 2)) + 1]
}' $FILE