support ssh.github.com

Fixes #208

lib/hub/context.rb

@@ -185,7 +185,11 @@ module Hub
       end
 
       def known_hosts
-        git_config('hub.host', :all).to_s.split("\n") + [default_host]
+        hosts = git_config('hub.host', :all).to_s.split("\n")
+        hosts << default_host
+        # support ssh.github.com
+        # https://help.github.com/articles/using-ssh-over-the-https-port
+        hosts << "ssh.#{default_host}"
       end
 
       def self.default_host
@@ -217,6 +221,7 @@ module Hub
       def initialize(*args)
         super
         self.host ||= (local_repo || LocalRepo).default_host
+        self.host = host.sub(/^ssh\./i, '') if 'ssh.github.com' == host.downcase
       end
 
       def private?

test/hub_test.rb

@@ -4,6 +4,7 @@ require 'rbconfig'
 require 'yaml'
 require 'forwardable'
 require 'fileutils'
+require 'tempfile'
 
 WebMock::BodyPattern.class_eval do
   undef normalize_hash
@@ -578,12 +579,19 @@ class HubTest < Test::Unit::TestCase
   end
 
   def test_hub_browse_ssh_alias
-    with_ssh_config do
+    with_ssh_config "Host gh\n User git\n HostName github.com" do
       stub_repo_url "gh:singingwolfboy/sekrit.git"
       assert_command "browse", "open https://github.com/singingwolfboy/sekrit"
     end
   end
 
+  def test_hub_browse_ssh_github_alias
+    with_ssh_config "Host github.com\n HostName ssh.github.com" do
+      stub_repo_url "git@github.com:suan/git-sanity.git"
+      assert_command "browse", "open https://github.com/suan/git-sanity"
+    end
+  end
+
   def test_custom_browser
     with_browser_env("custom") do
       assert_browser("custom")
@@ -748,10 +756,17 @@ class HubTest < Test::Unit::TestCase
       Hub::Commands.send :improved_help_text
     end
 
-    def with_ssh_config
-      config_file = File.expand_path '../ssh_config', __FILE__
-      Hub::SshConfig::CONFIG_FILES.replace [config_file]
+    def with_ssh_config content
+      config_file = Tempfile.open 'ssh_config'
+      config_file << content
+      config_file.close
+
+      begin
+        Hub::SshConfig::CONFIG_FILES.replace [config_file.path]
         yield
+      ensure
+        config_file.unlink
+      end
     end
 
 end

test/ssh_config

-Host gh
-  User git
-  HostName github.com