Better logging - more colors, less duplication

[roblabla]

Brings three improvements:

• Puts some color on the log level, which is neat
• Allows filtering of logs coming from userspace applications in grub. We can now do sunrise_clock=debug,info to get more debug information from sunrise_clock, for instance.
• Makes the outputDebugString aware of the log formatting, which results in logs that look like the following:

[INFO] - sunrise_clock - clock - 13:59:48 Thursday 23 May 19

instead of the old:

[INFO] - sunrise_kernel::interrupts::syscalls - clock - [INFO] - sunrise_clock - 13:59:48 Thursday 23 May 19

[Orycterope]

Great !

However, I don't see the code that handles filtering from grub arguments.
How are the arguments passed ? Args of the kernel ? Args of grub modules ?

It would be nice also to update all output_debug_string calls to new log!() syntax in this PR.

[Orycterope]

And if by any chance you figure out why colors end up fucking up the terminal it would be pretty great.

[roblabla]

However, I don't see the code that handles filtering from grub arguments.

It's implemented by virtue of going through the log! function (where we pass the target):
https://github.com/sunriseos/SunriseOS/pull/306/files#diff-cb4690a69ea17d472dcf59b6d931b36aR224

You put the filtering in the args of the kernel. Basically, multiboot2 /boot/sunrise-bootstrap "sunrise_clock=debug,info" will do what you'd expect.

It would be nice also to update all output_debug_string calls to new log!() syntax in this PR.

I did? If I missed any, it'd cause compilation errors since output_debug_string changed signature.

And if by any chance you figure out why colors end up fucking up the terminal it would be pretty great.

wdym? The colors work great on my end: