Refactor command handling code

Don’t rely on having external commands always present in the PATH in
order to find them. Instead, provide an accessory method to Tap so
they can be added and used when needed.

While we’re here, do some general refactoring and cleanup of the
command code in these places.

1 files changed, 5 insertions, 0 deletions

diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 2d1c47e32..ed93e1266 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -503,6 +503,11 @@ class Tap
     map(&:name).sort
   end
 
+  # an array of all tap cmd directory {Pathname}s
+  def self.cmd_directories
+    Pathname.glob TAP_DIRECTORY/"*/*/cmd"
+  end
+
   # @private
   def formula_file_to_name(file)
     "#{name}/#{file.basename(".rb")}"