Welcome plugin

[andrewthetechie]

Setup a plugin that welcomes new users.

Should send a DM to the new user.

Ask them how they found us -> send the answer to the admins/a channel for review

Suggest a list of channels to join -> make this dynamically configurable so we can change it without a PR.

[epequeno]

errbot does not currently handle the team_join event: errbotio/errbot@ae71f7b

I don't think there's a way for me to configure a callback for it directly in errbot.

slackclient has this onboarding example which would require flask running to listen for the event:
https://github.com/slackapi/python-slackclient/blob/7a045607fde73d252e9e74a1b2f397b88a7d50af/tutorial/PythOnBoardingBot/app.py#L44

here's an example of using the rtm client:
https://github.com/slackapi/python-slackclient/blob/7a045607fde73d252e9e74a1b2f397b88a7d50af/tutorial/PythOnBoardingBot/async_app.py#L42

if webhooks are ok then using this approach might be easiest: https://errbot.readthedocs.io/en/latest/user_guide/plugin_development/webhooks.html

[epequeno]

we had also discussed sqlite and having multiple clients.

This states sqlite can support multi threaded applications https://sqlite.org/threadsafe.html

[epequeno]

after discussing this with @andrewthetechie the current plan is to use the built in callback for when a member joins a channel
https://github.com/errbotio/errbot/blob/43b0733e4e79465c15a559c06d411271dcd35564/errbot/backends/slack.py#L426
https://github.com/errbotio/errbot/blob/43b0733e4e79465c15a559c06d411271dcd35564/errbot/backends/slack.py#L551

Since we're sub-classing we should be able to simply override the method and add our logic there.