[Console] Define isVerbose(), etc. methods in OutputInterface

src/Symfony/Component/Console/Output/OutputInterface.php

@@ -75,6 +75,34 @@ interface OutputInterface
      */
     public function getVerbosity();
 
+    /**
+     * Returns whether verbosity is quiet (-q)
+     *
+     * @return bool true if verbosity is set to VERBOSITY_QUIET, false otherwise
+     */
+    public function isQuiet();
+
+    /**
+     * Returns whether verbosity is verbose (-v)
+     *
+     * @return bool true if verbosity is set to VERBOSITY_VERBOSE, false otherwise
+     */
+    public function isVerbose();
+
+    /**
+     * Returns whether verbosity is very verbose (-vv)
+     *
+     * @return bool true if verbosity is set to VERBOSITY_VERY_VERBOSE, false otherwise
+     */
+    public function isVeryVerbose();
+
+    /**
+     * Returns whether verbosity is debug (-vvv)
+     *
+     * @return bool true if verbosity is set to VERBOSITY_DEBUG, false otherwise
+     */
+    public function isDebug();
+
     /**
      * Sets the decorated flag.
      *