use Module#const_get instead of eval

* may be a problem if the constant is scoped (like A::B), but this is not the case
  (const.split('::').inject(Object) { |c, part| c.const_get part } would solve that)
* this was noticed in a comment of 9afc85ad but it has disappeared

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

2 files changed, 2 insertions, 3 deletions

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index e394d0f5c..dd4e03261 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -378,7 +378,7 @@ class Formula
 
     begin
       klass_name = self.class_s(name)
-      klass = eval(klass_name)
+      klass = Object.const_get klass_name
     rescue NameError
       # TODO really this text should be encoded into the exception
       # and only shown if the UI deems it correct to show it
diff --git a/bin/brew b/bin/brew
index c06a673dc..5fe19cc89 100755
--- a/bin/brew
+++ b/bin/brew
@@ -71,10 +71,9 @@ begin
 
   # Add example external commands to PATH before checking.
   ENV['PATH'] += ":#{HOMEBREW_REPOSITORY}/Library/Contributions/examples"
-
   if system "/usr/bin/which -s brew-#{cmd}"
     %w[CACHE CELLAR LIBRARY_PATH PREFIX REPOSITORY].each do |e|
-      ENV["HOMEBREW_#{e}"] = eval "HOMEBREW_#{e}"
+      ENV["HOMEBREW_#{e}"] = Object.const_get "HOMEBREW_#{e}"
     end
     exec "brew-#{cmd}", *ARGV
   elsif require? `/usr/bin/which brew-#{cmd}.rb`