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@@ -13,6 +13,7 @@
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 $:.unshift(libdir, "#{libdir}/grit/lib", "#{libdir}/mime-types/lib")
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 require 'grit'
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 require 'time_extensions'
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+require 'string_hacks'
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 require 'InfoWindowController'
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 OSX.ns_import 'CommitSummaryCell'

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@@ -151,9 +151,9 @@
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     diffs = []
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     doc = @commit_details.mainFrame.DOMDocument
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     title, message = active_commit.message.split("\n", 2)
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-    set_html("title", title..strip.gsub("\n", "<br />"))
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+    set_html("title", title.escapeHTML.strip.gsub("\n", "<br />"))
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     if message
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-      set_html("message", message..strip.gsub("\n", "<br />"))
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+      set_html("message", message.escapeHTML.strip.gsub("\n", "<br />"))
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       show_element("message")
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     else
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       hide_element("message")

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@@ -1 +1,20 @@
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+class String
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+  HTML_ESCAPES = {
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+    ?& => "amp",
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+    ?" => "quot",
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+    ?< => "lt",
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+    ?> => "gt"
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+  }.freeze
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+
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+  def escapeHTML
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+    self.split("").collect { |x| HTML_ESCAPES.key?(x.ord) ? "&#{HTML_ESCAPES[x.ord]};" : x }.join("")
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+  end
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+
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+  # Ruby 1.9 forward-compatibility
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+  unless String.method_defined?(:ord)
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+    define_method :ord do
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+      self[0]
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+    end
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+  end
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+end