add default memory history

README.md

@@ -12,21 +12,21 @@ var prompt = require('prompt-sync')();
 //
 var n = prompt('How many more times? ');
 ```
-# WITH HISTORY
+# ADVANCED HISTORY
 
-History is an optional extra, to use simply install the history plugin. 
+History is configurable, for example using this extra package: 
 
 ```sh
-npm install --save prompt-sync-history
+npm install prompt-sync-history
 ```
 
 ```js
 var prompt = require('prompt-sync')({
-  history: require('prompt-sync-history')() //open history file
+  history: require('prompt-sync-history')() // open history file
 });
 //get some user input
 var input = prompt()
-prompt.history.save() //save history back to file
+prompt.history.save() // save history back to file
 ```
 
 See the [prompt-sync-history](http://npm.im/prompt-sync-history) module
@@ -80,10 +80,13 @@ History is not set when using hidden mode.
 # EXAMPLES
 
 ```js
-  //basic:
-  console.log(require('prompt-sync')()('tell me something about yourself: '))
+  // basic:
+  console.log(require('./')()('tell me something about yourself: '))
 
-  var prompt = require('prompt-sync')({
+  // ANSI escape codes colored text test
+  require('./')()('\u001B[31mcolored text: \u001B[39m');
+
+  var prompt = require('./')({
     history: require('prompt-sync-history')(),
     autocomplete: complete(['hello1234', 'he', 'hello', 'hello12', 'hello123456']),
     sigint: false
@@ -114,5 +117,5 @@ History is not set when using hidden mode.
       }
       return ret;
     };
-  };
-```
+  }
+````

index.js

@@ -4,6 +4,25 @@ var fs = require('fs');
 var stripAnsi = require('strip-ansi');
 var term = 13; // carriage return
 
+function createMemoryHistory() {
+  var HIST = [];
+  var ix = HIST.length;
+  return {
+    atStart() { return ix <= 0; },
+    atPenultimate() { return ix === HIST.length - 1; },
+    pastEnd() { return ix >= HIST.length; },
+    atEnd() { return ix === HIST.length; },
+    prev() { return HIST[--ix]; },
+    next() { return HIST[++ix]; },
+    reset() { ix = HIST.length; },
+    push(str) { 
+      if (HIST.includes(str)) return;
+      HIST.push(str);
+    },
+    save() { },
+  };
+}
+
 /**
  * create -- sync function for reading user input from stdin
  * @param   {Object} config {
@@ -16,15 +35,12 @@ var term = 13; // carriage return
 
  // for ANSI escape codes reference see https://en.wikipedia.org/wiki/ANSI_escape_code
 
-function create(config) {
-
-  config = config || {};
+function create(config = {}) {
   var sigint = config.sigint;
   var eot = config.eot;
   var autocomplete = config.autocomplete =
     config.autocomplete || function(){return []};
-  var history = config.history;
-  prompt.history = history || {save: function(){}};
+  var history = prompt.history = config.history || createMemoryHistory();
   prompt.hide = function (ask) { return prompt(ask, {echo: ''}) };
 
   return prompt;
@@ -46,20 +62,19 @@ function create(config) {
    */
 
 
-  function prompt(ask, value, opts) {
+  function prompt(ask = '', value, opts = {}) {
     var insert = 0, savedinsert = 0, res, i, savedstr;
-    opts = opts || {};
 
     if (Object(ask) === ask) {
       opts = ask;
-      ask = opts.ask;
+      ask = opts.ask || '';
     } else if (Object(value) === value) {
       opts = value;
       value = opts.value;
-    }
-    ask = ask || '';
+     }
+
     var echo = opts.echo;
-    var masked = 'echo' in opts;
+    var masked = opts.echo !== undefined;
     autocomplete = opts.autocomplete || autocomplete;
 
     var fd = (process.platform === 'win32') ?
@@ -215,7 +230,7 @@ function create(config) {
     process.stdin.setRawMode && process.stdin.setRawMode(wasRaw);
 
     return str || value || '';
-  };
+  }
 
 
   function promptPrint(masked, ask, echo, str, insert) {

test.js

@@ -1,4 +1,4 @@
-//basic:
+// basic:
 console.log(require('./')()('tell me something about yourself: '))
 
 // ANSI escape codes colored text test
@@ -35,4 +35,4 @@ function complete(commands) {
     }
     return ret;
   };
-};
+}