Pass answers object to transformer functions (#659)

README.md

@@ -113,7 +113,7 @@ A question object is a `hash` containing question related values:
 Array values can be simple `strings`, or `objects` containing a `name` (to display in list), a `value` (to save in the answers hash) and a `short` (to display after selection) properties. The choices array can also contain [a `Separator`](#separator).
 - **validate**: (Function) Receive the user input and answers hash. Should return `true` if the value is valid, and an error message (`String`) otherwise. If `false` is returned, a default error message is provided.
 - **filter**: (Function) Receive the user input and return the filtered value to be used inside the program. The value returned will be added to the _Answers_ hash.
-- **transformer**: (Function) Receive the user input and return the transformed value to be displayed to the user. The transformation only impacts what is shown while editing. It does not impact the `answers` hash.
+- **transformer**: (Function) Receive the user input and answers hash, and return a transformed value to display to the user. The transformation only impacts what is shown while editing. It does not modify the answers hash.
 - **when**: (Function, Boolean) Receive the current user answers hash and should return `true` or `false` depending on whether or not this question should be asked. The value can also be a simple boolean.
 - **pageSize**: (Number) Change the number of lines that will be rendered when using `list`, `rawList`, `expand` or `checkbox`.
 - **prefix**: (String) Change the default _prefix_ message.

lib/prompts/input.js

@@ -46,7 +46,7 @@ class InputPrompt extends Base {
     if (this.status === 'answered') {
       message += chalk.cyan(this.answer);
     } else if (transformer) {
-      message += transformer(this.rl.line);
+      message += transformer(this.rl.line, this.answers);
     } else {
       message += this.rl.line;
     }

test/specs/prompts/input.js

@@ -55,4 +55,25 @@ describe('`input` prompt', function() {
       done();
     }, 10);
   });
+
+  it('should use the answers object in the provided transformer', function(done) {
+    this.fixture.transformer = function(value, answers) {
+      return answers.capitalize ? value.toUpperCase() : value;
+    };
+
+    var answers = {
+      capitalize: true
+    };
+
+    var prompt = new Input(this.fixture, this.rl, answers);
+    prompt.run();
+
+    this.rl.line = 'inquirer';
+    this.rl.input.emit('keypress');
+
+    setTimeout(() => {
+      expect(this.rl.output.__raw__).to.contain('INQUIRER');
+      done();
+    }, 200);
+  });
 });