Add option to support custom formats

[eduhenke]

I would like to be able to customize the format of the outputted tag, like so:
Input:

type Foo struct {
  FooID int
}

What I want:

type Foo struct {
  FooID int `json:"fooId"`
}

If I use the camelcase option, the FooID, becomes, as expected, fooID, would there be any way to convert it to fooId?

[fatih]

Unfortunately there is no such transform. These are the current transformations we use:

I'm not sure how to fix your case without adding significant changes to the transform part. Making it customizable is also a lot of work as it would require me to implement something that needs to be generic and embeddable into Go. I think the best way for you is to use camelcase and then do a simple sed or find/replace with an editor to change them.

Let me know if that helps you. Thanks again for your feedback.