Support for TOML in config files?

[ChristianSi]

Personally I don't like YAML very much, as it is overly complicated. Maybe it would make sense to add support for TOML which is a much more lightweight format?

Downside is that Haskell currently lacks an up-to-date and well-maintained TOML parser.

[mf59816]

Good idea. (Note though that the yaml package also reads json, but toml probably has advantages over both.)

I would implement this thusly:

1. find a good-enough toml parser lib. (or write one.)
2. extend data Source with another constructor ConfigFileToml.
3. add a pattern in configify that translates toml into Aeson.Value, and then call parseConfigFile

I will do this as soon as I run out of ideas that I consider more important (currently: many (sorry :)). Pull requests are always welcome, of course