Re_botcmd_fullmatch: Add re_botcmd_fullmatch

Closes #402

plugins/re_botcmd_fullmatch.plug

@@ -0,0 +1,9 @@
+[Core]
+name = re_botcmd_fullmatch
+module = re_botcmd_fullmatch
+
+[Documentation]
+description = Checks whether all re_botcmd regexes are fullmatches or not and warns the admins.
+
+[Python]
+version = 3

plugins/re_botcmd_fullmatch.py

@@ -0,0 +1,35 @@
+import time
+import threading
+
+from errbot import BotPlugin, botcmd
+
+
+class Re_botcmd_fullmatch(BotPlugin):
+    """
+    Checks whether all re_botcmd regexes are fullmatches or not and warns the
+    admins.
+    """
+
+    def activate(self):
+        super().activate()
+        # start asynchronously
+        threading.Thread(target=self.check_regexes).start()
+
+    def check_regexes(self):
+        # Allow all plugins to activate
+        time.sleep(60)
+
+        if hasattr(self.bot_config, 'RE_BOTCMD_FULLMATCH_IGNORES'):
+            ignores = self.bot_config.RE_BOTCMD_FULLMATCH_IGNORES
+        else:
+            ignores = tuple()
+
+        msg = 'Following re_botcmds have pattern that are not fullmatches: '
+
+        for name, func in dict(self._bot.re_commands).items():
+            pattern = func._err_command_re_pattern.pattern
+            if not (pattern.startswith('^') and pattern.endswith('$') and
+                    name not in ignores):
+                msg += '\n- `{}` - `{}`'.format(name, pattern)
+
+        self.warn_admins(msg)