experimental Matrix & Mattermost backends

[nim65s]

Hi,

Here are PoC for two other backends.

I just checked that the !date module works.

Mandatory XCKD: https://xkcd.com/1810/

[sleduc]

Two questions about this PR (I am trying to add a new "backend" to pipobot, and I just remembered you did the same with other protocols :p).

Wouldn't it be better to move the "parse_mess" method from "pipobot.lib.modules" to the bot class itself ? This way the "module" implementation could remain protocol-independant.
I guess we just need to define a "generic interface" for what a "message" is (I guess a "body", a "sender", and a "type").
Or we could just do the parsing in the bot class, and then change the "signature" of "do_answer" in pipobot/lib/modules.py to take this "message" class instead of assuming it is a Jabber message.

Also I was wondering on how to be able to use one protocol without being "bothered" by other ones. Since in "pipobot/init.py" we import all bots variants (BotJabber, BotMattermost, ...), it means that even if you want to do just "jabber" with your bot, you will still need to have installed the python modules required to do "mattermost".

[nim65s]

I think defining a "generic message" with body / sender / type should work.

And yes, I agree that the variants should be imported only if needed.