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Railway Oriented Programming for Go

For reading more about Railway Oriented Programming, look here.

It's easy to construct reusable chains, with stateless functions and even (to some extent) graphs of functionalities.

It's nontheorical essence is:

                ________    ________    ________
happy path  --->|      |--->|      |--->|      |---> result
                | func |    | func |    | func |
failure     --->|      |--->|      |--->|      |---> error
                --------    --------    --------

As you see it looks like the idiomatic Go pattern of writing functions as func(TIn) (TOut, error), except for the input error from previous step.

A sequential chain of functions can be made like:

c := Chain(nil, step1, step2, step3)

res := c(Result{...})

Status: WIP; there are v1 and v2 branches, but it's being redesigned to more closely resembles Go's middleware pattern. For example now we can handle panics as we do in web apps.