🧐 StructInit

Go Linter to check struct's field initialization order.

⬇️ Getting Started

Run it as a standalone linter

To install it, run:

go install github.com/manuelarte/structinit@latest

And then use it with:

structinit [--fix] ./...

• fix: true|false (default false) Fix the field instantiation order.

Run it as a module plugin in golangci-lint

You can integrate this linter with golangci-lint by using the module plugin.

Example of a custom-gcl.yml file that includes this linter:

version: v2.12.2
plugins:
  - module: "github.com/manuelarte/structinit"
    import: "github.com/manuelarte/structinit/plugin"
    version: latest

🚀 Feature

By marking a struct with //go:structinit, that indicates that whenever you initialize that struct, the fields need to be initialized in the same order as they are declared in the struct.

//go:structinit
type MyStruct struct {
    Field1 string
    Field2 int

func NewMyStruct() *MyStruct {
    return &MyStruct{
        Field1: "value1",
        Field2: 42,
    }
}

func OtherMyStruct() *MyStruct {
    return &MyStruct{ // Linter will complain about this, since it's expecting Field1 to be initialized first.
        Field2: 42,
        Field1: "value1",
    }
}

❓ FAQ

Why not lint every instantiation?

There are several reasons why it is not "easy" to lint every instantiation of a struct. When instantiating a struct not using "static" values, there could be some side effects. Check example.go.