refactor and make an interface to get the public key in an printable format

ui/cli.py

@@ -221,6 +221,12 @@ class Persona(object):
 
 		return self._identity
 
+	def get_pubkey(self):
+		'''Get a printable version of the public key.  This is used
+		for importing into different programs, or for shared.'''
+
+		return base58.b58encode_check(self._identity.pubkey)
+
 	def new_version(self, *args):
 		'''Update the Persona's Identity object.'''
 
@@ -502,7 +508,7 @@ def main():
 			persona = Persona.load(identfname)
 
 		if options.printpub:
-			print base58.b58encode_check(persona.get_identity().pubkey)
+			print persona.get_pubkey()
 			return
 
 		persona.new_version(*addprops)
@@ -717,6 +723,9 @@ class _TestCases(unittest.TestCase):
 		idobj = persona.get_identity()
 		self.assertIsInstance(idobj['pubkey'], str)
 
+		# that get_pubkey returns the correct thing
+		self.assertEqual(persona.get_pubkey(), base58.b58encode_check(idobj['pubkey']))
+
 		# and that there is a signature
 		self.assertIsInstance(idobj['sig'], str)
 
@@ -917,7 +926,7 @@ class _TestCases(unittest.TestCase):
 
 				# the correct key is printed
 				self.assertEqual(stdout.getvalue(),
-				    '%s\n' % base58.b58encode_check(pident.pubkey))
+				    '%s\n' % persona.get_pubkey())
 
 			# and looked up the correct file
 			eu.assert_called_with('~/.medashare_identity.pasn1')