Interaction on alias when 2nd arg is existing…

…alias. Just asks if we want to alias the new alias to that package as well. Useful when you want to add a few similar aliases to a single package in case of mistyping.

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to `geekish/crap` will be documented in this file and follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## 1.0.0-beta.4 - TBD
+
+### Changed
+
+- Interaction on `alias` command when the second argument is an existing alias.
+
 ## 1.0.0-beta.3 - 2017-01-08
 
 ### Added

src/Command/AliasCommand.php

@@ -140,6 +140,22 @@ protected function interact(InputInterface $input, OutputInterface $output)
                 $input->setArgument("alias", $args[2]);
                 $input->setArgument("package", $args[1]);
             }
+        } elseif ($this->helper->validateAlias($args[1]) && $this->helper->hasAlias($args[2])) {
+            $output->writeln("<info>You provided an existing alias instead of a package.</info>");
+
+            $existing = $this->helper->getAlias($args[2]);
+
+            $message = sprintf(
+                "<question>Do you want to alias `%s` to `%s`?</question> (y/n) ",
+                $args[1],
+                $existing
+            );
+
+            $question = new ConfirmationQuestion($message, false);
+
+            if ($helper->ask($input, $output, $question)) {
+                $input->setArgument("package", $existing);
+            }
         }
     }
 }