removing colours from loggo package

[roger peppe]

I've proposed an initial PR to address this:

https://github.com/juju/loggo/pull/25


On 21 February 2017 at 14:02, roger peppe <roger.peppe at canonical.com> wrote:
> In August, the loggo package was changed to make it log ANSI-terminal
> colour escape sequences by default.
>
> I'm not sure that was the right decision, for a couple of reasons:
>
> - daemons are often given a pseudo tty to run in, so the log files
> produced by our running services are now obscured by escape sequences,
> making them hard to process automatically (and larger).
>
> - it means that the loggo dependencies are much larger.  Where
> previously the loggo package had no non-stdlib dependencies, it now
> depends on 5 significantly sized repositories holding >100k lines of
> source, including at least one system-dependent (Windows-only) repo.
>
> I'd like to propose that we remove the colour-by-default logic from
> loggo and move it to a separate package where it can be used if
> required by a given client. Perhaps github.com/utils/loggocolor might
> be a reasonable place.
>
> Then we can change the juju command line client to use that writer by
> default meaning there should be no change in externally visible
> behaviour to juju client users. The jujud server executable should
> probably not be using coloured logging output IMO.
>
> Thoughts?
>
>   cheers,
>     rog.