Importing a package declared in the root directory of a module

[Victor Giordano]

Hi there! 

I was playing a little bit with modules and packages, regarding making projects.

And I'm struggling to use a package (non-main) declared in the root directory.. allow me to show an example:

This scenario,  I have project somewhere on my file system

.
├── cmd
│   └── main.go
├── go.mod
└── util.go

go.mod

module a_module_path

go 1.19

util.go

package util

func Abs(x int) int {

if x < 0 {

return -x

} else {

return x

}

}

And the problem appears when I try to use the package util (in the root directory of the module) within another package of the module...

cmd/main.go

package main

import (

"fmt"

"a_module_path/util" // this doesn't works

"a_module_path/../util" // this attemp neither (and as relative import paths are not supported in module mode i guess is a no-go)

)

func main() {

fmt.Println(util.Abs(-2))

}

The question, as you may predict, is ¿If there any way to make this work?

I do not want to create a folder named util (or whatever) and place there the util package.

Thanks for the reading and the patience!

Keep rocking code! 

[Sean Liao]

import "a_module_path"

optionally rename it to make it clearer

import util "a_module_path"

- sean

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[Victor Giordano]

Thanks Sean!!

That makes sense for me!

But i guess I must import with an alias as import without an alias doesn't works, right?

<user>@<machine>:<the_project_folder>/cmd$ go build .
# a_module_path/cmd
./main.go:4:2: imported and not used: "a_module_path" as util
./main.go:9:14: undefined: a_module_path

main.go

package main

import (

"a_module_path"

"fmt"

)

func main() {

fmt.Println(a_module_path.Abs(-2))

}

I mean... i'm actually importing it without utill.. so the message kind of confuse me.

Thanks again.

[Sean Liao]

the import path specifies the location to find a package, but the actual identifier used is the one in the package declaration, so

import "a_module_path"

var foo = util.Foo

- sean

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[Victor Giordano]

Thanks again!

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V