Add options.limitMessage.

lib/readline-sync.js

@@ -24,6 +24,7 @@ var
     noEchoBack:     false,
     mask:           '*',
     limit:          [],
+    limitMessage:   'Input another, please.',
     caseSensitive:  false,
     noTrim:         false,
     encoding:       'utf8',
@@ -45,7 +46,7 @@ var
   noTrim:         boolean
   encoding, bufferSize, print
 */
-function _readlineSync(options) {return options;
+function _readlineSync(options) {
   var input = '', displaySave = options.display,
     silent = !options.display && options.keyIn && options.noEchoBack && !options.mask;
 
@@ -415,6 +416,7 @@ function margeOptions() {
         // string
         case 'mask':                        // *    *
         case 'encoding':                    // *    *
+        case 'limitMessage':                //      *
 /* jshint eqnull:true */
           options[optionName] = value != null ? value + '' : '';
 /* jshint eqnull:false */
@@ -458,28 +460,51 @@ function margeOptions() {
   }, {});
 }
 
-function flattenArray(array, validate) {
+function flattenArray(array, validator) {
   var flatArray = [];
   function parseArray(array) {
 /* jshint eqnull:true */
     if (array == null) { return; }
 /* jshint eqnull:false */
     else if (Array.isArray(array)) { array.forEach(parseArray); }
-    else if (!validate || validate(array)) { flatArray.push(array); }
+    else if (!validator || validator(array)) { flatArray.push(array); }
   }
   parseArray(array);
   return flatArray;
 }
 
+function isMatchedLimit(res, limit, caseSensitive) {
+  return !limit.length || limit.some(function(valid) {
+    if (typeof valid === 'number') { valid += ''; }
+    return typeof valid === 'string' ? (
+        caseSensitive ?
+          res === valid : res.toLowerCase() === valid.toLowerCase()
+        ) :
+      valid instanceof RegExp ? valid.test(res) : false;
+  });
+}
+
+function readlineWithOptions(options) {
+  var res, limitSave = options.limit, displaySave = options.display;
+  options.display += '';
+  options.limit = ''; // for readlineExt
+  while (true) {
+    res = _readlineSync(options);
+    if (isMatchedLimit(res, limitSave, options.caseSensitive)) { break; }
+    options.display += (options.display ? '\n' : '') +
+      (options.limitMessage ? options.limitMessage + '\n' : '') + displaySave;
+  }
+  return res;
+}
+
 // for dev
 exports._useExtSet = function(use) { useExt = use; };
 
 exports.prompt = function(options) {
-  var readOptions = margeOptions(true, options),
-    limit = readOptions.limit, res;
-  readOptions.display = readOptions.prompt + '';
-  readOptions.limit = ''; // for readlineExt
-  res = _readlineSync(readOptions);
+  var readOptions = margeOptions(true, options), res;
+  readOptions.display = readOptions.prompt;
+  res = readlineWithOptions(readOptions);
+
   return res;
 };
 
@@ -487,10 +512,8 @@ exports.question = function(query, options) {
   var readOptions = margeOptions(margeOptions(true, options), {
       display:        query
     }),
-    limit = readOptions.limit, res;
-  readOptions.display += '';
-  readOptions.limit = ''; // for readlineExt
-  res = _readlineSync(readOptions);
+    res = readlineWithOptions(readOptions);
+
   return res;
 };