Add Homebrew.install_gem_setup_path! function.

This uses the logic from tests.rb in man.rb too so that this can be
shared in a few places.

1 files changed, 8 insertions, 0 deletions

diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index cafee2025..c7e61e379 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -119,6 +119,14 @@ module Homebrew
   def self.git_last_commit
     HOMEBREW_REPOSITORY.cd { `git show -s --format="%cr" HEAD 2>/dev/null`.chuzzle }
   end
+
+  def self.install_gem_setup_path! gem
+    return if quiet_system "gem", "list", "--installed", gem
+    system "gem", "install", "--no-ri", "--no-rdoc",
+           "--user-install", gem
+    require "rubygems"
+    ENV["PATH"] = "#{Gem.user_dir}/bin:#{ENV["PATH"]}"
+  end
 end
 
 def with_system_path