add support of select from option list in ConsoleIO and NullIO

src/Composer/IO/ConsoleIO.php

@@ -237,4 +237,12 @@ class ConsoleIO extends BaseIO
         // not able to hide the answer, proceed with normal question handling
         return $this->ask($question);
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function select($question, $choices, $default = null, $attempts = false, $errorMessage = 'Value "%s" is invalid', $multiselect = false)
+    {
+        return $this->helperSet->get('dialog')->select($this->output, $question, $choices, $default, $attempts, $errorMessage, $multiselect);
+    }
 }

src/Composer/IO/IOInterface.php

@@ -124,6 +124,22 @@ interface IOInterface
      */
     public function askAndHideAnswer($question);
 
+    /**
+     * Asks the user to select a value.
+     *
+     * @param string|array $question     The question to ask
+     * @param array        $choices      List of choices to pick from
+     * @param bool|string  $default      The default answer if the user enters nothing
+     * @param bool|int     $attempts Max number of times to ask before giving up (false by default, which means infinite)
+     * @param string       $errorMessage Message which will be shown if invalid value from choice list would be picked
+     * @param bool         $multiselect  Select more than one value separated by comma
+     *
+     * @return int|string|array The selected value or values (the key of the choices array)
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function select($question, $choices, $default = null, $attempts = false, $errorMessage = 'Value "%s" is invalid', $multiselect = false);
+
     /**
      * Get all authentication information entered.
      *

src/Composer/IO/NullIO.php

@@ -104,4 +104,12 @@ class NullIO extends BaseIO
     {
         return null;
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function select($question, $choices, $default = null, $attempts = false, $errorMessage = 'Value "%s" is invalid', $multiselect = false)
+    {
+        return $default;
+    }
 }

tests/Composer/Test/IO/ConsoleIOTest.php

@@ -149,6 +149,31 @@ class ConsoleIOTest extends TestCase
         $consoleIO->askAndValidate('Why?', 'validator', 10, 'default');
     }
 
+    public function testSelect()
+    {
+        $inputMock = $this->getMock('Symfony\Component\Console\Input\InputInterface');
+        $outputMock = $this->getMock('Symfony\Component\Console\Output\OutputInterface');
+        $dialogMock = $this->getMock('Symfony\Component\Console\Helper\DialogHelper');
+        $helperMock = $this->getMock('Symfony\Component\Console\Helper\HelperSet');
+
+        $dialogMock->expects($this->once())
+            ->method('select')
+            ->with($this->isInstanceOf('Symfony\Component\Console\Output\OutputInterface'),
+                $this->equalTo('Select item'),
+                $this->equalTo(array("item1", "item2")),
+                $this->equalTo(null),
+                $this->equalTo(false),
+                $this->equalTo("Error message"),
+                $this->equalTo(true));
+        $helperMock->expects($this->once())
+            ->method('get')
+            ->with($this->equalTo('dialog'))
+            ->will($this->returnValue($dialogMock));
+
+        $consoleIO = new ConsoleIO($inputMock, $outputMock, $helperMock);
+        $consoleIO->select('Select item', array("item1", "item2"), null, false, "Error message", true);
+    }
+
     public function testSetAndgetAuthentication()
     {
         $inputMock = $this->getMock('Symfony\Component\Console\Input\InputInterface');

tests/Composer/Test/IO/NullIOTest.php

@@ -67,4 +67,11 @@ class NullIOTest extends TestCase
 
         $this->assertEquals('foo', $io->askAndValidate('question', 'validator', false, 'foo'));
     }
+
+    public function testSelect()
+    {
+        $io = new NullIO();
+
+        $this->assertEquals('1', $io->select('question', array('item1', 'item2'), '1', 2, 'foo', true));
+    }
 }