Organize local code in packages using Go modules

Question

I can not find a way to factor out some code from main.go into a local package when using Go modules (go version >= 1.11) outside of $GOPATH.

I am not importing any external dependencies that need to be included into go.mod, I am just trying to organize locally the source code of this Go module.

The file main.go:

package main

// this import does not work
import "./stuff"

func main() {
    stuff.PrintBaz()
}

The file ./stuff/bar.go (pretending to be a local package):

package stuff

import "log"

type Bar struct {
    Baz int
}

func PrintBaz() {
    baz := Bar{42}
    log.Printf("Bar struct: %v", baz)
}

The file go.mod (command go mod init foo):

module foo

go 1.12

When executing go run main.go:

• If I import "./stuff", then I see build command-line-arguments: cannot find module for path _/home/<PATH_TO>/fooprj/stuff.
• If I import "stuff", then I see build command-line-arguments: cannot load stuff: cannot find module providing package stuff.
• If I import stuff "./stuff" with a package alias, then I see again: build command-line-arguments: cannot find module for path _/home/<PATH_TO>/fooprj/stuff.

I can not find a way to make local packages work with go modules.

• What's wrong with the code above?
• How can I import local packages into other Go code inside a project defined with Go modules (file go.mod)?

Answer 1

Waitting for answers