Some improvements to send_tweet example

- [x] Handling the exception when libturpial is not in the sys.path
- [x] Now it's possible to parse arguments from the command line
- [] Support for identi.ca protocol

examples/send_tweet.py

@@ -2,28 +2,60 @@
 # -*- coding: utf-8 -*-
 
 # Libturpial usage example
-# 
+#
 # Author: Carlos Guerrero <guerrerocarlos@gmail.com>
 # 24 June 2013
 
+import os
+import sys
+import argparse
 
-from libturpial.api.models.account import Account
-from libturpial.api.core import Core
+try:
+    from libturpial.api.models.account import Account
+    from libturpial.api.core import Core
+except ImportError:
+    path = \
+        os.path.join(os.path.dirname(os.path.abspath(__file__)), '..')
+    sys.path.append(path)
 
-account = "username-twitter" #Replace <username> with the user you want to send tweet with
-message = "Tweet sent using Libturpial"
+    from libturpial.api.models.account import Account
+    from libturpial.api.core import Core
 
-c = Core()
-accounts = c.list_accounts()
+core = Core()
 
-if account in accounts:
-    c.update_status(account,message)
+# Parsing the command line
+description = "Send a message from libturpial"
+parser = argparse.ArgumentParser(description=description)
+parser.add_argument("-u", "--username", dest="username",
+                    help="Username", required=True)
+parser.add_argument("-p", "--protocol", dest="protocol",
+                    choices=core.list_protocols(), help="Protocol",
+                    required=True)
+parser.add_argument("-m", "--message", dest="message", help="Message",
+                    required=True)
+args = parser.parse_args()
+
+
+username = args.username
+protocol = args.protocol
+account_pattern = "-".join([username, protocol])
+message = args.message
+
+print "Trying to send message '%s'\nas user: %s, protocol: %s" % (message,
+                                                                  username,
+                                                                  protocol)
+
+if account_pattern in core.list_accounts():
+    core.update_status(account_pattern, message)
 else:
-    #If account is not already registered in libturpial, acces must be granted:
-    a = Account.new('twitter') #you can also create identi.ca accounts
-    url = a.request_oauth_access()
-    print "Please go to the following URL, log-in and allow access for Libturpial. Then write the PIN in here."
-    print url
-    cod = raw_input("PIN:")
-    a.authorize_oauth_access(cod)
-    c.register_account(a)
+    # If account is not already registered in libturpial,
+    # access must be granted:
+    account = Account.new(protocol)
+    url = account.request_oauth_access()
+    instructions = "Please go to the following URL, log-in and allow access" \
+                   " for libturpial. Then write the PIN in here."
+    print "%s\n%s" % (instructions, url)
+    cod = raw_input("PIN: ")
+    account.authorize_oauth_access(cod)
+    account_id = core.register_account(account)
+    core.update_status(account_id, message)