I had never used the Workspace mode added in Go 1.18, so I decided to give it a try.
What is Workspace Mode?
A feature to facilitate Go's multi-module structure.
How to Use Workspace Mode
Prepare the following structure:
.
├── bar
│ └── bar.go
└── foo
└── foo.go
// foo.go
package foo
func Foo() string {
return "foo"
}
// bar.go
package bar
func Bar() string {
return "bar"
}
Execute the following command in the foo directory to set up go.mod.
go mod init example.com/foo
Similarly, execute the following command in the bar directory to set up go.mod.
go mod init example.com/bar
Next, create a cmd directory and create a main.go file as follows:
package main
import (
"example.com/bar"
"example.com/foo"
)
func main() {
println(foo.Foo())
println(bar.Bar())
}
Set up go.mod in the cmd directory as well.
go mod init example.com/cmd
At this point, the structure will be as follows:
.
├── bar
│ ├── bar.go
│ └── go.mod
├── cmd
│ ├── go.mod
│ └── main.go
└── foo
├── foo.go
└── go.mod
In the root directory, execute the following command to configure the workspace.
go work init foo bar cmd
A file named go.work is created.
go 1.21.1
use (
./bar
./cmd
./foo
)
Verify that go run cmd/main.go can be executed.
// Execution result
foo
bar
Next, let's add a module called baz.
.
├── bar
│ ├── bar.go
│ └── go.mod
├── baz
│ ├── baz.go
│ └── go.mod
├── cmd
│ ├── go.mod
│ └── main.go
├── foo
│ ├── foo.go
│ └── go.mod
└── go.work
// baz.go
package baz
func Baz() string {
return "baz"
}
Execute go mod init example.com/baz to generate go.mod like the other modules.
Next, add baz to main.go.
package main
import (
"example.com/bar"
"example.com/baz"
"example.com/foo"
)
func main() {
println(foo.Foo())
println(bar.Bar())
println(baz.Baz())
}
Return to the root and execute go work use baz to add the module, and baz will be added to go.work.
go 1.21.1
use (
./bar
./baz
./cmd
./foo
)
Execute go run cmd/main.go and confirm that baz is added to the output.
// Execution result
foo
bar
baz
Impressions
I thought the multi-module structure was cumbersome, so I'm glad it has become simpler.
