How to use functions in a .tpl file?

[JustinTrvz]

How to use the replaceAll function in a .tpl file?

I tried to use it like this:

func init() {
    eps["/{{ replaceAll .Name "_" "/" }}"] = []gin.HandlerFunc{
        Ctl2Endpoint(Process{{ .Name | capitalize }}),
    }
}

So when my plantuml file is called create_user.plantuml, the endpoint would be /create/user.
But this does not work. I am trying to archive grouped endpoints.

Also I would like to combine functions somehting like this:

func Process{{ .Name | capitalize | replaceAll .Name "_" "" }}(in state.Input, reqCtx *ReqCtx) (state.Output, error) {

to convert create_user to CreateUser.