From 8d674422491957675eae942ff3cb222ca0625925 Mon Sep 17 00:00:00 2001
From: RonanSauvage <ronan.sau@gmail.com>
Date: Sat, 28 Oct 2017 11:18:10 +0200
Subject: [PATCH 1/2] Fix #21789 : CLI Windows autcompletion for ChoiceQuestion
 function

---
 .../Component/Console/Helper/Helper.php       | 20 +++++++++++++++++++
 .../Console/Helper/QuestionHelper.php         |  2 +-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Console/Helper/Helper.php b/src/Symfony/Component/Console/Helper/Helper.php
index 8bf82a148732a..c4004c8678914 100644
--- a/src/Symfony/Component/Console/Helper/Helper.php
+++ b/src/Symfony/Component/Console/Helper/Helper.php
@@ -22,6 +22,11 @@ abstract class Helper implements HelperInterface
 {
     protected $helperSet = null;
 
+    const OS_UNKNOWN = 1;
+    const OS_WIN = 2;
+    const OS_LINUX = 3;
+    const OS_OSX = 4;
+
     /**
      * {@inheritdoc}
      */
@@ -121,4 +126,19 @@ public static function removeDecoration(OutputFormatterInterface $formatter, $st
 
         return $string;
     }
+
+    /**
+     * GET Os Terminal to define CLI's behavior
+     * Used especially for autocompletion
+     * @return string
+     */
+    public function getOSTerminal()
+    {
+        switch (true){
+            case stristr(PHP_OS, 'DAR'): return self::OS_OSX;
+            case stristr(PHP_OS, 'WIN'): return self::OS_WIN;
+            case stristr(PHP_OS, 'LINUX'): return self::OS_LINUX;
+            default : return self::OS_UNKNOWN;
+        }
+    }
 }
diff --git a/src/Symfony/Component/Console/Helper/QuestionHelper.php b/src/Symfony/Component/Console/Helper/QuestionHelper.php
index 1f3e4ff14ac38..ba3e55f2cd9d0 100644
--- a/src/Symfony/Component/Console/Helper/QuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/QuestionHelper.php
@@ -114,7 +114,7 @@ public function doAsk(OutputInterface $output, Question $question)
         $inputStream = $this->inputStream ?: STDIN;
         $autocomplete = $question->getAutocompleterValues();
 
-        if (null === $autocomplete || !$this->hasSttyAvailable()) {
+        if ((null === $autocomplete || self::OS_WIN == $this->getOSTerminal()) || !$this->hasSttyAvailable()) {
             $ret = false;
             if ($question->isHidden()) {
                 try {

From 3f0bceffd6de8916ee35c9d2b4c3edb3080e8b0a Mon Sep 17 00:00:00 2001
From: RonanSauvage <ronan.sau@gmail.com>
Date: Sat, 28 Oct 2017 13:32:36 +0200
Subject: [PATCH 2/2] fabbot.io

---
 src/Symfony/Component/Console/Helper/Helper.php | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/Symfony/Component/Console/Helper/Helper.php b/src/Symfony/Component/Console/Helper/Helper.php
index c4004c8678914..b9727d13b4aea 100644
--- a/src/Symfony/Component/Console/Helper/Helper.php
+++ b/src/Symfony/Component/Console/Helper/Helper.php
@@ -129,16 +129,17 @@ public static function removeDecoration(OutputFormatterInterface $formatter, $st
 
     /**
      * GET Os Terminal to define CLI's behavior
-     * Used especially for autocompletion
+     * Used especially for autocompletion.
+     *
      * @return string
      */
     public function getOSTerminal()
     {
-        switch (true){
+        switch (true) {
             case stristr(PHP_OS, 'DAR'): return self::OS_OSX;
             case stristr(PHP_OS, 'WIN'): return self::OS_WIN;
             case stristr(PHP_OS, 'LINUX'): return self::OS_LINUX;
-            default : return self::OS_UNKNOWN;
+            default: return self::OS_UNKNOWN;
         }
     }
 }