[RFC] Features/configurable log name

[richo]

So this is a quick and dirty stab at enabling a workflow I need: Two weechats running. One for a work server that likes to do lots of force joining and generally messing with my client, and one for all the other clients.

Before this, I was doing something like;

weechat
# Set that up for personal
mv ~/.weechat/weechat.{,personal.}log
weechat
# setup for work

but it's pretty awkward. With this patch I can just do

WEECHAT_LOG_NAME=work.log weechat and have it do the right thing. Thoughts?

[richo]

EDIT: Also, how should I go about emitting a useful warning? Before this patch there was only one real error condition. Should I just refactor log_init and have more than one return value?

[flashcode]

Running two different WeeChat with same home can lead to problems (the test is made on weechat.log, but this file is not really a problem).
Bypassing this test will bring problems with config files, log files, and files created by plugins, like scripts, DCC (xfer), ...

[flashcode]

By the way, there's a task planned to have separate directories: https://savannah.nongnu.org/task/?10934