feat(lib): add package-level functions

[nikoksr]

Description

Similar to some packages of the standard libarary (e.g. log) Notify now has a global but private standard instance that gets created on initialization. This is more of a convenience feature as it potentially saves a single step when interacting with Notify. Functions like UseServices and Send are now usable directly from the package. Think of how you can use log.Print(...) directly but can also create and use a logger instance with log.New(...).

In the following we assume that s is a fully initialized Notify service.

Example(old):

  n := notify.New()
  n.UseServices(s)
  n.Send(...)

Example(new):

  notify.UseServices(s)
  notify.Send(...)

Of course the function New still exists! This is a non-breaking change that, in a sense, just adds some syntactic-sugar.

Motivation and Context

Make the interaction with Notify optionally easier and more intuitiv.

How Has This Been Tested?

Wrote a small tool that uses my local version of Notify, created some services and send messages through them.

Screenshots / Output (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.