signal-finder: add script

[bin.git] / fortune

diff --git a/fortune b/fortune
index 8d1ed43f441b63d798502811a19b1c7277982666..fde90857a6d61e6d17080364c1c9a470158f888a 100755 (executable)
--- a/fortune
+++ b/fortune
@@ -1,51 +1,86 @@
 #!/usr/bin/sh -e
-# Fortune implementation in awk
+# Fortune implementation in POSIX sh/awk
 
-usage()
-{
-    echo "fortune -- a simple awk/POSIX sh implementation of fortune"
-    echo ""
-    echo "\t-h, --help                   show this help message"
-    echo "\t-l, --list=\$FILE            list installed cookie files"
-    echo "\t-f=\$FILE, --file=\$FILE     specify path to cookie file"
-    echo "\t-c=\$FILE, --cookie=\$FILE   specify cookie file"
+usage() {
+  echo 'Usage: fortune [OPTIONS]
+a simple POSIX sh/awk implementation of 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'
 }
 
-FILE="$(find /usr/share/fortune/ -type f -not -name '*.dat')"
+parse_err() {
+  echo "$1"
+  $2
+  exit 2
+}
+
+DIR=${FORTUNEDIR:-"/usr/share/fortune/"}
+FILE="$(find $DIR -type f -not -name '*.dat')"
+MAXLENGTH=1000000000000
+MINLENGTH=0
+
 while [ "$1" != "" ]; do
-  PARAM=`echo $1 | awk -F= '{print $1}'`
-  VALUE=`echo $1 | awk -F= '{print $2}'`
-  case $PARAM in
-      -h | --help)
-          usage
-          exit
-          ;;
-      -f | --file)
-          FILE=$VALUE
-          ;;
-      -c | --cookie)
-          FILE=/usr/share/fortune/$VALUE
-          ;;
-      -l | --list)
-        ls -1 /usr/share/fortune
-        exit
-        ;;
-      *)
-          echo "ERROR: unknown parameter \"$PARAM\""
-          usage
-          exit 1
-          ;;
+  case $1 in
+    -h | --help)
+      usage
+      exit
+      ;;
+    -c | --cookie)
+      FILE=$DIR/$2
+      ;;
+    -n | --min)
+      MINLENGTH=$2
+      ;;
+    -N | --max)
+      MAXLENGTH=$2
+      ;;
+    -l | --list)
+      ls -1 $DIR
+      exit
+      ;;
+    *)
+      parse_err "ERROR: unknown option \"$1\"" usage
+      ;;
   esac
-  shift
+  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++
+  }
 }
 
 {
@@ -54,7 +89,7 @@ $1 == "%" {
 }
 
 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