examples/scripts/shprompt

   1 #
   2 # shprompt -- give a prompt and get an answer satisfying certain criteria
   3 #
   4 # shprompt [-dDfFsy] prompt
   5 #       s = prompt for string
   6 #       f = prompt for filename
   7 #       F = prompt for full pathname to a file or directory
   8 #       d = prompt for a directory name
   9 #       D = prompt for a full pathname to a directory
  10 #       y = prompt for y or n answer
  11 #
  12 # Chet Ramey
  13 # chet@ins.CWRU.Edu
  14 #
  15 #  Copyright 2002 Chester Ramey
  16 #
  17 #   This program is free software; you can redistribute it and/or modify
  18 #   it under the terms of the GNU General Public License as published by
  19 #   the Free Software Foundation; either version 2, or (at your option)
  20 #   any later version.
  21 #
  22 #   TThis program is distributed in the hope that it will be useful,
  23 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 #   GNU General Public License for more details.
  26 #
  27 #   You should have received a copy of the GNU General Public License
  28 #   along with this program; if not, write to the Free Software Foundation,
  29 #   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30
  31 type=file
  32
  33 OPTS=dDfFsy
  34
  35 succeed()
  36 {
  37         echo "$1"
  38         exit 0
  39 }
  40
  41 while getopts "$OPTS" c
  42 do
  43         case "$c" in
  44         s)      type=string
  45                 ;;
  46         f)      type=file
  47                 ;;
  48         F)      type=path
  49                 ;;
  50         d)      type=dir
  51                 ;;
  52         D)      type=dirpath
  53                 ;;
  54         y)      type=yesno
  55                 ;;
  56         ?)      echo "usage: $0 [-$OPTS] prompt" 1>&2
  57                 exit 2
  58                 ;;
  59         esac
  60 done
  61
  62 if [ "$OPTIND" -gt 1 ] ; then
  63         shift $(( $OPTIND - 1 ))
  64 fi
  65
  66 while :
  67 do
  68         case "$type" in
  69         string)
  70                 echo -n "$1" 1>&2
  71                 read ans || exit 1
  72                 if [ -n "$ans" ] ; then
  73                         succeed "$ans"
  74                 fi
  75                 ;;
  76         file|path)
  77                 echo -n "$1" 1>&2
  78                 read ans || exit 1
  79                 #
  80                 # use `fn' and eval so that bash will do tilde expansion for
  81                 # me
  82                 #
  83                 eval fn="$ans"
  84                 case "$fn" in
  85                 /*)     if test -e "$fn" ; then
  86                                 succeed "$fn"
  87                         else
  88                                 echo "$0: '$fn' does not exist" 1>&2
  89                         fi
  90                         ;;
  91                 *)      if [ "$type" = "path" ] ; then
  92                                 echo "$0: must give full pathname to file" 1>&2
  93                         else
  94                                 if test -e "$fn" ; then
  95                                         succeed "$fn"
  96                                 else
  97                                         echo "$0: '$fn' does not exist" 1>&2
  98                                 fi
  99                         fi
 100                         ;;
 101                 esac
 102                 ;;
 103         dir|dirpath)
 104                 echo -n "$1" 1>&2
 105                 read ans || exit 1
 106                 #
 107                 # use `fn' and eval so that bash will do tilde expansion for
 108                 # me
 109                 #
 110                 eval fn="$ans"
 111                 case "$fn" in
 112                 /*)     if test -d "$fn" ; then
 113                                 succeed "$fn"
 114                         elif test -e "$fn" ; then
 115                                 echo "$0 '$fn' is not a directory" 1>&2
 116                         else
 117                                 echo "$0: '$fn' does not exist" 1>&2
 118                         fi
 119                         ;;
 120                 *)      if [ "$type" = "dirpath" ] ; then
 121                                 echo "$0: must give full pathname to directory" 1>&2
 122                         else
 123                                 if test -d "$fn" ; then
 124                                         succeed "$fn"
 125                                 elif test -e "$fn" ; then
 126                                         echo "$0 '$fn' is not a directory" 1>&2
 127                                 else
 128                                         echo "$0: '$fn' does not exist" 1>&2
 129                                 fi
 130                         fi
 131                         ;;
 132                 esac
 133                 ;;
 134         yesno)
 135                 echo -n "$1" 1>&2
 136                 read ans || exit 1
 137                 case "$ans" in
 138                 y|Y|[yY][eE][sS])
 139                         succeed "yes"
 140                         ;;
 141                 n|N|[nN][oO])
 142                         succeed "no"
 143                         exit 0
 144                         ;;
 145                 *)
 146                         echo "$0: yes or no required" 1>&2
 147                         ;;
 148                 esac
 149                 ;;
 150         esac
 151 done
 152
 153 exit 1