Imported from ../bash-2.0.tar.gz.

examples/scripts.noah/y_or_n_p.bash

@@ -0,0 +1,78 @@
+# y_or_n_p.bash
+# Author: Noah Friedman <friedman@prep.ai.mit.edu>
+# Created: 1992-06-18
+# Last modified: 1993-03-01
+# Public domain
+
+# Conversion to bash v2 syntax done by Chet Ramey
+
+# Commentary:
+# Code:
+
+#:docstring y_or_n_p:
+# Usage: y_or_n_p QUERY
+#
+# Print QUERY on stderr, then read stdin for a y-or-n response.  Actually,
+# user may type anything they like, but first character must be a `y', `n',
+# `q', or `!', otherwise the question is repeated until such an answer is
+# obtained.  
+#
+# If user typed `y', y_or_n_p returns 0.
+#
+# If user typed `n', y_or_n_p returns 1.
+#
+# If user typed `!', y_or_n_p returns 2.  This is an indication to the
+#  caller that no more queries should be made.  Assume `y' for all the rest. 
+#
+# If user typed `q', y_or_n_p returns 3.  This is an indication to the
+#  caller that no more queries should be made.  Assume `n' for all the rest.
+#
+#:end docstring:
+
+###;;;autoload
+function y_or_n_p ()
+{
+ local ans
+
+    [ ! -t 0 ] && return 1
+
+    while read -p "$*" -e ans ; do
+	case "${ans}" in
+        y* | Y* ) return 0 ;;
+        n* | N* ) return 1 ;;
+        \! )      return 2 ;;
+        q* | Q* ) return 3 ;;
+        *) echo "Please answer one of \`y', \`n', \`q', or \`"\!"'" 1>&2 ;;
+	esac
+   done
+}
+
+#:docstring yes_or_no_p:
+# Usage: yes_or_no_p QUERY
+#
+# Like y_or_n_p, but require a full `yes', `no', `yes!', or `quit' response. 
+#:end docstring:
+
+###;;;autoload
+function yes_or_no_p ()
+{
+    local ans
+
+    [ ! -t 0 ] && return 3
+
+    while read -p "$*" -e ans; do
+        ans="$(echo ${ans} | tr '[A-Z]' '[a-z]')"
+
+        case "${ans}" in
+        yes )   return 0 ;;
+        no )    return 1 ;;
+        yes\! ) return 2 ;;
+        quit )  return 3 ;;
+        *) echo "Please answer \`yes', \`no', \`yes"\!"', or \`quit'" 1>&2 ;;
+       esac
+   done
+}
+
+provide y_or_n_p
+
+# y_or_n_p.bash ends here