examples/choice.sh

   1 #!/bin/sh
   2 # A very simple example to demonstrate mixing options given by links and
   3 # free-form input.
   4
   5 function readline {
   6     echo -n '<' >&3
   7     read line
   8     ret=$?
   9     echo -n '>' >&3
  10     echo "$line"
  11     return $ret
  12 }
  13
  14 while true; do
  15     cat <<EOF
  16 What's your favourite colour?
  17 => ?red Red
  18 => ?green Green
  19 => ?octarine Octarine
  20 => ?!? [Something else]
  21 EOF
  22     colour="$(readline)"
  23     cat <<EOF
  24 Hmm... $colour, eh? It has its virtues, I suppose.
  25 But are you sure really sure $colour is your favourite?
  26 => ?yes Yes
  27 => ?no No
  28 EOF
  29     while conf="$(readline)"; do
  30         if [ "$conf" == yes ]; then
  31             echo "Fine."
  32             exit
  33         elif [ "$conf" == no ]; then
  34             echo "Hmm, let's try this again then."
  35             break
  36         else
  37             echo "Pardon? Was that yes or no?"
  38         fi
  39     done
  40 done