`git am` can now also apply patches from Gists

lib/hub/commands.rb

@@ -217,10 +217,12 @@ module Hub
     # > curl https://github.com/defunkt/hub/pull/55.patch -o /tmp/55.patch
     # > git am /tmp/55.patch
     def am(args)
-      if url = args.find { |a| a =~ %r{^https?://github\.com/} }
+      if url = args.find { |a| a =~ %r{^https?://(gist\.)?github\.com/} }
         idx = args.index(url)
-        url += '.patch' unless File.extname(url) == '.patch'
-        patch_file = File.join(ENV['TMPDIR'], File.basename(url))
+        gist = $1 == 'gist.'
+        ext = gist ? '.txt' : '.patch'
+        url += ext unless File.extname(url) == ext
+        patch_file = File.join(ENV['TMPDIR'], "#{gist ? 'gist-' : ''}#{File.basename(url)}")
         args.before 'curl', ['-#LA', "hub #{Hub::Version}", url, '-o', patch_file]
         args[idx] = patch_file
       end

test/hub_test.rb

@@ -352,6 +352,16 @@ class HubTest < Test::Unit::TestCase
     end
   end
 
+  def test_am_gist
+    with_tmpdir('/tmp/') do
+      url = 'https://gist.github.com/8da7fb575debd88c54cf'
+
+      assert_commands "curl -#LA 'hub #{Hub::Version}' #{url}.txt -o /tmp/gist-8da7fb575debd88c54cf.txt",
+                      "git am --signoff /tmp/gist-8da7fb575debd88c54cf.txt -p2",
+                      "am --signoff #{url} -p2"
+    end
+  end
+
   def test_init
     assert_commands "git init", "git remote add origin git@github.com:tpw/hub.git", "init -g"
   end