Added capability for a URI to be constructed from_wsgi; work on #13.

setup.py

@@ -24,6 +24,7 @@
 		'pytest-cov',  # coverage reporting
 		'pytest-flakes',  # syntax validation
 		'pytest-isort',  # import ordering
+		'webob',  # Request WSGI environment mocking.
 	]
 
 trove_map = {

uri/uri.py

@@ -65,6 +65,29 @@ class URI(object):
 	hostname = host
 	credentials = authentication = auth
 
+	# Factories
+
+	@classmethod
+	def from_wsgi(URI, environ):
+		if hasattr(environ, 'environ'):  # Incidentally support passing of a variety of Request object wrappers.
+			environ = environ.environ
+
+		scheme = environ['wsgi.url_scheme']
+
+		uri = URI(
+				scheme = environ['wsgi.url_scheme'],
+				host = environ['SERVER_NAME'],
+				path = environ['SCRIPT_NAME'] + environ['PATH_INFO'],
+				query = environ['QUERY_STRING']
+			)
+
+		# Handled this way to automatically elide default port numbers.
+		if scheme == 'http' and environ['SERVER_PORT'] != 80 or\
+				scheme == 'https' and environ['SERVER_PORT'] != 443:
+			uri.port = environ['SERVER_PORT']
+
+		return uri
+
 	# Shortcuts
 
 	@property