More work on branch-specific PHP-CS-Fixer cache files

Author: sebastianbergmann

.gitignore

@@ -14,7 +14,7 @@
 
 # PHP-CS-Fixer
 /.php-cs-fixer.php
-/.php-cs-fixer.cache*
+/.php-cs-fixer.cache
 
 # Psalm
 /.psalm/cache

.php-cs-fixer.dist.php

@@ -341,10 +341,6 @@
         'whitespace_after_comma_in_array' => true,
     ]);
 
-$branch = @trim((string) @shell_exec('git rev-parse --abbrev-ref HEAD'));
-
-if (!empty($branch)) {
-    $config->setCacheFile(__DIR__ . '/.php-cs-fixer.cache.' . $branch);
-}
+$config->setCacheFile(__DIR__ . '/.php-cs-fixer.cache/' . sha1(@trim((string) @shell_exec('git rev-parse --abbrev-ref HEAD'))));
 
 return $config;