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+-- This script may be used with the email-filter or repo.email-filter settings in cgitrc.
+-- It adds libravatar icons to author names. It is designed to be used with the lua:
+-- prefix in filters.
+--
+-- Requirements:
+--      luacrypto >= 0.3
+--      <http://mkottman.github.io/luacrypto/>
+--
+
+local crypto = require("crypto")
+
+function filter_open(email, page)
+        buffer = ""
+        md5 = crypto.digest("md5", email:sub(2, -2):lower())
+end
+
+function filter_close()
+        html("<img src='//cdn.libravatar.org/avatar/" .. md5 .. "?s=13&amp;d=retro' width='13' height='13' alt='Libravatar' /> " .. buffer)
+        return 0
+end
+
+function filter_write(str)
+        buffer = buffer .. str
+end
+
+