XDG_CONFIG_HOME support in mbsync

[Andreas G. <an...@gr...>]

Hello,

I know there’s been interest in adding XDG_CONFIG_HOME support for the config file locations of mbsync from a previous thread on this list:

https://sourceforge.net/p/isync/mailman/message/37004353/ <https://sourceforge.net/p/isync/mailman/message/37004353/>

and from this reasonably well-received feature request:

https://sourceforge.net/p/isync/feature-requests/14/ <https://sourceforge.net/p/isync/feature-requests/14/>

Attached to this message is a patch implementing one half of the requested feature.

The patch changes the way that mbsync looks for a config file in the following way:

1.) it expands XDG_CONFIG_HOME, if set, and otherwise defaults to $HOME/.config as per the specification
2.) it attempts to open the config file at location $XDG_CONFIG_HOME/mbsync/config
3.) if that failed, it will fall back to $HOME/.mbsyncrc

I should note this approach still falls short of the specification in that the directories in $XDG_CONFIG_DIRS are not considered.

A documentation change is included as well.

Let me know if you want any changes to this patch, I’ll happily go through a couple of iterations. I think it’s important to get this right :)

If this change is welcome, I can look into using XDG_DATA_HOME for ~/.local/share/mbsync as well, as requested in the original feature request.

Thanks,
Andreas