Log messages have no source

[reynir]

Log messages from yocaml appear to come from the application. It would, in my opinion, be quite nice if they would have more descriptive names.

[DEBUG][git.mem]: Store cdd9bb65d4cf9bf757941d58b500d9a576df9f87.
[INFO][application]: `./articles/gptar-update.html` has been written

Unfortunately, it doesn't seem to me to be straight forward to plug in a log source in Yocaml_log:

yocaml/lib/core/eff.ml

Lines 101 to 104 in 1fbb78d

	type _ Effect.t +=
	| Yocaml_log :
	([ `App | `Error | `Warning | `Info | `Debug ] * string)
	-> unit Effect.t

Unless we are okay with depending on ocaml-logs in the core:

type _ Effect.t +=
  | Yocaml_log : (Logs.Src.t * Logs.level * string) -> unit Effect.t

(Or there is some type magic we can do to plug in a log source in there.. I don't know)

[xhtmlboi]

I'm not against depending on ocaml-logs at the core level. Besides, I think we should do a real pass on logs, which aren't very useful or readable :O

I'll leave it open until I find the right approach, but is it urgent?

[reynir]

Thanks! No, it's not super urgent. I was using the log output to debug #61, but I seem to have found the cause (git-kv). It's mainly helpful to sort out log messages by log source when debugging issues. For normal operation I would say it mostly doesn't matter :D