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 type=file
  16
  17 OPTS=dDfFsy
  18
  19 succeed()
  20 {
  21         echo "$1"
  22         exit 0
  23 }
  24
  25 while getopts "$OPTS" c
  26 do
  27         case "$c" in
  28         s)      type=string
  29                 ;;
  30         f)      type=file
  31                 ;;
  32         F)      type=path
  33                 ;;
  34         d)      type=dir
  35                 ;;
  36         D)      type=dirpath
  37                 ;;
  38         y)      type=yesno
  39                 ;;
  40         ?)      echo "usage: $0 [-$OPTS] prompt" 1>&2
  41                 exit 2
  42                 ;;
  43         esac
  44 done
  45
  46 if [ "$OPTIND" -gt 1 ] ; then
  47         shift $[$OPTIND - 1]
  48 fi
  49
  50 while :
  51 do
  52         case "$type" in
  53         string)
  54                 echo -n "$1" 1>&2
  55                 read ans || exit 1
  56                 if [ -n "$ans" ] ; then
  57                         succeed "$ans"
  58                 fi
  59                 ;;
  60         file|path)
  61                 echo -n "$1" 1>&2
  62                 read ans || exit 1
  63                 #
  64                 # use `fn' and eval so that bash will do tilde expansion for
  65                 # me
  66                 #
  67                 eval fn="$ans"
  68                 case "$fn" in
  69                 /*)     if test -e "$fn" ; then
  70                                 succeed "$fn"
  71                         else
  72                                 echo "$0: '$fn' does not exist" 1>&2
  73                         fi
  74                         ;;
  75                 *)      if [ "$type" = "path" ] ; then
  76                                 echo "$0: must give full pathname to file" 1>&2
  77                         else
  78                                 if test -e "$fn" ; then
  79                                         succeed "$fn"
  80                                 else
  81                                         echo "$0: '$fn' does not exist" 1>&2
  82                                 fi
  83                         fi
  84                         ;;
  85                 esac
  86                 ;;
  87         dir|dirpath)
  88                 echo -n "$1" 1>&2
  89                 read ans || exit 1
  90                 #
  91                 # use `fn' and eval so that bash will do tilde expansion for
  92                 # me
  93                 #
  94                 eval fn="$ans"
  95                 case "$fn" in
  96                 /*)     if test -d "$fn" ; then
  97                                 succeed "$fn"
  98                         elif test -e "$fn" ; then
  99                                 echo "$0 '$fn' is not a directory" 1>&2
 100                         else
 101                                 echo "$0: '$fn' does not exist" 1>&2
 102                         fi
 103                         ;;
 104                 *)      if [ "$type" = "dirpath" ] ; then
 105                                 echo "$0: must give full pathname to directory" 1>&2
 106                         else
 107                                 if test -d "$fn" ; then
 108                                         succeed "$fn"
 109                                 elif test -e "$fn" ; then
 110                                         echo "$0 '$fn' is not a directory" 1>&2
 111                                 else
 112                                         echo "$0: '$fn' does not exist" 1>&2
 113                                 fi
 114                         fi
 115                         ;;
 116                 esac
 117                 ;;
 118         yesno)
 119                 echo -n "$1" 1>&2
 120                 read ans || exit 1
 121                 case "$ans" in
 122                 y|Y|[yY][eE][sS])
 123                         succeed "yes"
 124                         ;;
 125                 n|N|[nN][oO])
 126                         succeed "no"
 127                         exit 0
 128                         ;;
 129                 *)
 130                         echo "$0: yes or no required" 1>&2
 131                         ;;
 132                 esac
 133                 ;;
 134         esac
 135 done
 136
 137 exit 1