Merge add cache-busting checksum to main.css link in head.
diff --git a/_includes/head.html b/_includes/head.html
index 8264788..7bcf1fa 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -1,5 +1,7 @@
<head>
- <link rel="stylesheet" href="/styles/main.css">
+ <link rel="stylesheet" href="/styles/main.css?s={{
+ 'styles/main.css' | checksum
+ }}">
<link rel="icon" type="image/png" href="/images/guacamole-logo-64.png"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no, target-densitydpi=device-dpi"/>
<meta charset="UTF-8"/>
diff --git a/_plugins/checksum.rb b/_plugins/checksum.rb
new file mode 100644
index 0000000..d528d4a
--- /dev/null
+++ b/_plugins/checksum.rb
@@ -0,0 +1,27 @@
+require 'digest'
+
+module GuacChecksumFilter
+
+ #
+ # Returns an arbitrary, unique checksum for the given file, calculated from
+ # the file's contents. The resulting checksum is guaranteed to be safe for
+ # inclusion within URLs.
+ #
+ # == Parameters:
+ # input::
+ # The name of the file to use to generate the checksum.
+ #
+ # == Returns:
+ # An arbitrary, unique checksum generated from the contents of the given
+ # file.
+ #
+ def checksum(input)
+ digest = Digest::MD5.file input
+ digest.hexdigest
+ end
+
+end
+
+# Register checksum filter with Liquid
+Liquid::Template.register_filter(GuacChecksumFilter)
+
