Logger interface

[tamalsaha]

Instead of introducing a custom logger interface, please consider https://github.com/go-logr/logr

[robfig]

It doesn't seem like logr has any traction, and it has a more complicated interface than the single Printf method, which would make adapting existing logger implementations to it more more difficult.

[tamalsaha]

It is being used in the Kubernetes project.
https://github.com/kubernetes-sigs/controller-runtime/search?q=logr&unscoped_q=logr

But I understand your point. I just wish Go had an official logger interface.

[robfig]

I didn't realize it was used in Kubernetes. Like you, I wish Go had a widely-adopted Logger interface. Reading more, it seems like they have done a good job thinking it through.

Here's what it would look like for cron. What do you think?
da975fa

[mwei0210]

Wouldn't work with https://github.com/uber-go/zap

[tamalsaha]

@mwei0210 , you can use https://github.com/go-logr/zapr

[tamalsaha]

Thanks for considering logr. Your pr looks good to me @robfig !

[robfig]

I think the resulting code works well, so I've pushed this to the v3 branch. I also tagged a new release. Please give it a go and let me know any feedback. Thanks