Make dependency on python-dateutil optionnal.

plugins/Time/plugin.py

@@ -31,8 +31,6 @@ import time
 TIME = time # For later use.
 from datetime import datetime
 
-from dateutil import parser
-
 import supybot.conf as conf
 import supybot.utils as utils
 from supybot.commands import *
@@ -40,7 +38,10 @@ import supybot.callbacks as callbacks
 from supybot.i18n import PluginInternationalization, internationalizeDocstring
 _ = PluginInternationalization('Time')
 
-def parse(s):
+
+try:
+    from dateutil import parser
+    def parse(s):
         todo = []
         s = s.replace('noon', '12:00')
         s = s.replace('midnight', '00:00')
@@ -54,6 +55,8 @@ def parse(s):
         for f in todo:
             i = f(i)
         return i
+except ImportError:
+    parse = None
 
 class Time(callbacks.Plugin):
     @internationalizeDocstring
@@ -99,6 +102,9 @@ class Time(callbacks.Plugin):
         <time string> can be any number of natural formats; just try something
         and see if it will work.
         """
+        if not parse:
+            irc.error(_('This command is not available on this bot, ask the '
+                'owner to install the python-dateutil library.'), Raise=True)
         now = int(time.time())
         new = parse(s)
         if new != now:
@@ -113,6 +119,9 @@ class Time(callbacks.Plugin):
 
         Returns the number of seconds until <time string>.
         """
+        if not parse:
+            irc.error(_('This command is not available on this bot, ask the '
+                'owner to install the python-dateutil library.'), Raise=True)
         now = int(time.time())
         new = parse(s)
         if new != now: