add GitHub commit onebox

lib/oneboxer/github_commit_onebox.rb

@@ -0,0 +1,24 @@
+require_dependency 'oneboxer/handlebars_onebox'
+
+module Oneboxer
+  class GithubCommitOnebox < HandlebarsOnebox
+
+    matcher /^https?:\/\/(?:www\.)?github\.com\/[^\/]+\/[^\/]+\/commit\/.+/
+    favicon 'github.png'
+
+    def translate_url
+      m = @url.match(/github\.com\/(?<owner>[^\/]+)\/(?<repo>[^\/]+)\/commit\/(?<sha>[^\/]+)/mi)
+      return "https://api.github.com/repos/#{m[:owner]}/#{m[:repo]}/commits/#{m[:sha]}" if m.present?
+      @url
+    end
+
+    def parse(data)
+      result = JSON.parse(data)
+
+      result['commit_date'] = Time.parse(result['commit']['author']['date']).strftime("%I:%M%p - %d %b %y")
+
+      result
+    end
+
+  end
+end