audit: check the use of Dir[]

Sometimes `Dir[]` is used with single files/directories unnecessarily.

1 files changed, 4 insertions, 0 deletions

diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index db56663a4..721f6c987 100644
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -525,6 +525,10 @@ class FormulaAuditor
     if line =~ /depends_on ['"](.+)['"] (if.+|unless.+)$/
       audit_conditional_dep($1, $2, $&)
     end
+
+    if line =~ /(Dir\[("[^\*{},]+")\])/
+      problem "#{$1} is unnecessary; just use #{$2}"
+    end
   end
 
   def audit_conditional_dep(dep, condition, line)