Cli:: add prompt_for_password() helper method

src/Cli.php

@@ -341,4 +341,24 @@ class Cli {
     exit($exit_code);
   }
 
+  /**
+   * Helper method to ask user to enter a password
+   * Note: this method use the bash binary and a fatal error will be trigger if it's not available.
+   * @param string|null $prompt The prompt message (optional)
+   * @return string
+   */
+  public static function prompt_for_password($prompt=null) {
+    // Check bash is available
+  	$command = "/usr/bin/env bash -c 'echo OK'";
+  	if (rtrim(shell_exec($command)) !== 'OK')
+      Log::fatal(I18n::_("Can't invoke bash. Can't ask password prompt."));
+
+  	$command = "/usr/bin/env bash -c 'read -s -p \"";
+  	$command .= addslashes($prompt?_($prompt):I18n::_("Please enter password:"));
+  	$command .= "\" mypassword && echo \$mypassword'";
+  	$password = rtrim(shell_exec($command));
+  	echo "\n";
+  	return $password;
+  }
+
 }