git-up.rb in git-up-0.5.0

- old
+ new

@@ -145,11 +145,19 @@
     begin
       require 'bundler'
       ENV['BUNDLE_GEMFILE'] ||= File.expand_path('Gemfile')
       Bundler.setup
     rescue Bundler::GemNotFound, Bundler::GitError
-      puts 'Gems are missing.  You should `bundle install`.'.yellow
+      puts
+      print 'Gems are missing. '.yellow
+
+      if config("bundler.autoinstall") == 'true'
+        puts "Running `bundle install`.".yellow
+        system "bundle", "install"
+      else
+        puts "You should `bundle install`.".yellow
+      end
     end
   end
 
   def is_fast_forward?(a, b)
     merge_base(a.name, b.name) == b.commit.sha
@@ -181,9 +189,35 @@
   end
 
 private
 
   def use_bundler?
-    ENV['GIT_UP_BUNDLER_CHECK'] == 'true' and File.exists? 'Gemfile'
+    use_bundler_config? and File.exists? 'Gemfile'
+  end
+
+  def use_bundler_config?
+    if ENV.has_key?('GIT_UP_BUNDLER_CHECK')
+      puts <<-EOS.yellow
+The GIT_UP_BUNDLER_CHECK environment variable is deprecated.
+You can now tell git-up to check (or not check) for missing
+gems on a per-project basis using git's config system. To
+set it globally, run this command anywhere:
+
+    git config --global git-up.bundler.check true
+
+To set it within a project, run this command inside that
+project's directory:
+
+    git config git-up.bundler.check true
+
+Replace 'true' with 'false' to disable checking.
+EOS
+    end
+
+    config("bundler.check") == 'true' || ENV['GIT_UP_BUNDLER_CHECK'] == 'true'
+  end
+
+  def config(key)
+    repo.config["git-up.#{key}"]
   end
 end
 