import plugins from core and restructure repo

gravatar/Readme.rst

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+Gravatar
+--------
+
+This plugin assigns the ``author_gravatar`` variable to the Gravatar URL and
+makes the variable available within the article's context. You can add
+``AUTHOR_EMAIL`` to your settings file to define the default author's email
+address. Obviously, that email address must be associated with a Gravatar
+account.
+
+Alternatively, you can provide an email address from within article metadata::
+
+    :email:  john.doe@example.com
+
+If the email address is defined via at least one of the two methods above,
+the ``author_gravatar`` variable is added to the article's context.

gravatar/__init__.py

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+from .gravatar import *

gravatar/gravatar.py

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+"""
+Gravatar plugin for Pelican
+===========================
+
+This plugin assigns the ``author_gravatar`` variable to the Gravatar URL and
+makes the variable available within the article's context.
+"""
+
+import hashlib
+import six
+
+from pelican import signals
+
+
+def add_gravatar(generator, metadata):
+
+    #first check email
+    if 'email' not in metadata.keys()\
+        and 'AUTHOR_EMAIL' in generator.settings.keys():
+            metadata['email'] = generator.settings['AUTHOR_EMAIL']
+
+    #then add gravatar url
+    if 'email' in metadata.keys():
+        email_bytes = six.b(metadata['email']).lower()
+        gravatar_url = "http://www.gravatar.com/avatar/" + \
+                        hashlib.md5(email_bytes).hexdigest()
+        metadata["author_gravatar"] = gravatar_url
+
+
+def register():
+    signals.article_generate_context.connect(add_gravatar)