instance extends feature

[kwolfy]

This adds the ability to dynamically create "child-loggers"
This is just add-on, not breaking-change

Example

const debug = require('debug');

const log = debug('auth');
const logSign = log.extend('sign');
const logLogin = log.extend('login');

log('hello'); // auth hello
logSign('hello'); //auth:sign hello
logLogin('hello'); //auth:login hello

It's useful when there is one class with large functions that need to be divided into different namespace but at the same time be able to easily log all of them

[coveralls]

Coverage increased (+2.0%) to 75.74% when pulling 75c91df on kwolfy:master into 285dfe1 on visionmedia:master.

[coveralls]

Coverage increased (+2.0%) to 75.74% when pulling 75c91df on kwolfy:master into 285dfe1 on visionmedia:master.

[coveralls]

Coverage increased (+1.7%) to 75.449% when pulling 35c03f2 on kwolfy:master into 285dfe1 on visionmedia:master.

[Qix-]

Closes #399.

[Qix-]

One comment - also, can you rebase first and add documentation to the readme?

[Qix-]

You can remove the if check and just change the + delimiter + to + (delimiter || ':') +

[Qix-]

Your tests appear to be failing. Could you check on those?

[kwolfy]

@Qix- I fix it

[Qix-]

Great, thanks!

[Qix-]

@TooTallNate / @thebigredgeek can I get a review on this?

[thebigredgeek]

This is clever. I love it. @TooTallNate ?

[DhavalW]

I've implemented child instances similarly, in debug-pest, which is a light wrapper over debug.
Along with log levels (log, warn, error),
& the ability to swap debug in & out without breaking anything.

I did break convention a little bit - to include log levels as the topmost namespace.
ie logs:octopus:endpoint, errors:octopus:endpoint

so that logs & warnings may be shut off while errors are allowed to show, for all modules in a single shot. ie - errors:*, -logs:*, -warnings:*

Does that make sense ? Could there be any issues with it ?
Also, happy to contribute that code here, if you guys like it.

[Qix-]

Landing this, though please see #598 (comment).

[kwolfy]

Thank you!

[mlshvdv]

Thanks a lot!