#
# shprompt -- give a prompt and get an answer satisfying certain criteria
#
# shprompt [-dDfFsy] prompt
# s = prompt for string
# f = prompt for filename
# F = prompt for full pathname to a file or directory
# d = prompt for a directory name
# D = prompt for a full pathname to a directory
# y = prompt for y or n answer
#
# Chet Ramey
# chet@ins.CWRU.Edu
type=file
OPTS=dDfFsy
succeed()
{
echo "$1"
exit 0
}
while getopts "$OPTS" c
do
case "$c" in
s) type=string
;;
f) type=file
;;
F) type=path
;;
d) type=dir
;;
D) type=dirpath
;;
y) type=yesno
;;
?) echo "usage: $0 [-$OPTS] prompt" 1>&2
exit 2
;;
esac
done
if [ "$OPTIND" -gt 1 ] ; then
shift $[$OPTIND - 1]
fi
while :
do
case "$type" in
string)
echo -n "$1" 1>&2
read ans || exit 1
if [ -n "$ans" ] ; then
succeed "$ans"
fi
;;
file|path)
echo -n "$1" 1>&2
read ans || exit 1
#
# use `fn' and eval so that bash will do tilde expansion for
# me
#
eval fn="$ans"
case "$fn" in
/*) if test -e "$fn" ; then
succeed "$fn"
else
echo "$0: '$fn' does not exist" 1>&2
fi
;;
*) if [ "$type" = "path" ] ; then
echo "$0: must give full pathname to file" 1>&2
else
if test -e "$fn" ; then
succeed "$fn"
else
echo "$0: '$fn' does not exist" 1>&2
fi
fi
;;
esac
;;
dir|dirpath)
echo -n "$1" 1>&2
read ans || exit 1
#
# use `fn' and eval so that bash will do tilde expansion for
# me
#
eval fn="$ans"
case "$fn" in
/*) if test -d "$fn" ; then
succeed "$fn"
elif test -e "$fn" ; then
echo "$0 '$fn' is not a directory" 1>&2
else
echo "$0: '$fn' does not exist" 1>&2
fi
;;
*) if [ "$type" = "dirpath" ] ; then
echo "$0: must give full pathname to directory" 1>&2
else
if test -d "$fn" ; then
succeed "$fn"
elif test -e "$fn" ; then
echo "$0 '$fn' is not a directory" 1>&2
else
echo "$0: '$fn' does not exist" 1>&2
fi
fi
;;
esac
;;
yesno)
echo -n "$1" 1>&2
read ans || exit 1
case "$ans" in
y|Y|[yY][eE][sS])
succeed "yes"
;;
n|N|[nN][oO])
succeed "no"
exit 0
;;
*)
echo "$0: yes or no required" 1>&2
;;
esac
;;
esac
done
exit 1