Add remote{host,user,pass}eval config options (need documentation yet)

From Ben Kibbey

hello,

Attached is a patch to enable evaluation of account credentials with the
remotehosteval, remoteusereval and remotepasseval configuration options.
I needed this because rather than change all my other programs
configuration settings when I change, say a password, I store them in a
file. So I call a function in pythonfile which parses the credential
file and returns the wanted info. Not really very well tested, but not
complex either. Offlineimap is great, thanks.

offlineimap/repository/IMAP.py

@@ -85,10 +85,30 @@ class IMAPRepository(BaseRepository):
         return self.imapserver.delim
 
     def gethost(self):
-        return self.getconf('remotehost')
+	host = None
+        localeval = self.localeval
+
+        if self.config.has_option(self.getsection(), 'remotehosteval'):
+	    host = self.getconf('remotehosteval')
+	if host != None:
+	    return localeval.eval(host)
+
+	host = self.getconf('remotehost')
+	if host != None:
+	    return host
 
     def getuser(self):
-        return self.getconf('remoteuser')
+	user = None
+        localeval = self.localeval
+
+        if self.config.has_option(self.getsection(), 'remoteusereval'):
+	    user = self.getconf('remoteusereval')
+	if user != None:
+	    return localeval.eval(user)
+
+	user = self.getconf('remoteuser')
+	if user != None:
+	    return user
 
     def getport(self):
         return self.getconfint('remoteport', None)
@@ -109,6 +129,14 @@ class IMAPRepository(BaseRepository):
         return self.getconfboolean('expunge', 1)
 
     def getpassword(self):
+	passwd = None
+        localeval = self.localeval
+
+        if self.config.has_option(self.getsection(), 'remotepasseval'):
+	    passwd = self.getconf('remotepasseval')
+	if passwd != None:
+	    return localeval.eval(passwd)
+
         password = self.getconf('remotepass', None)
         if password != None:
             return password