I have been running localslackirc (it's in debian) to access slack from IRC. I still have to open it in the browser every once in a while, to search old thread

I have been running localslackirc (it's in debian) to access slack from IRC. I still have to open it in the browser every once in a while, to search old threads or other stuff that is not supported. But day to day I can do everything in irc. There is also a weechat plugin afaik. It's a bit annoying to configure the access but it seems the tokens never expire (or have not yet expired) so it shouldn't be too frequent for you either.