I'm new to Go (but not at programming), I love the language but I have a bit of trouble fully understanding the way I'm supposed to make internal libraries in an application through packages. For reference, getting external packages and then importing/using them is fine.
Let's say I'm making an application A.
/home/me/A/a.go (package main)
Then, I realize a.go start to be rather big, so I cut it into two parts
/home/me/A/a.go (package main)
/home/me/A/b.go (package main)
How am I supposed to import/include b.go from a.go to make its function available ?
As a continuation of the question, in the A I'm manipulation lots of objects O, so I figure it would be a lot better if I just give them their own package and encapsulate the functionalities in a public/exported api. How do I do that ?
I've tried creating ./lib/o.go
(package o) and import lib/o
but I keep getting error like
./a.go:6: imported and not used: "o"
./a.go:43: undefined: o
I have no GOPATH in my env but I tried export GOPATH=$GOPATH:/home/me/A
and it didn't change the result.
I've tried to read the article on "go layout" but it felt a bit too overwhelming at once and I would really love a simpler explanation of that one "small" step I am trying to make
Thanks !
GOPATH/src/me/a/a.go:
package main
func main() {
test()
}
GOPATH/src/me/a/test.go:
package main
import "fmt"
func test() {
fmt.Println("test func !")
}
Exec:
$ go run a.go
# command-line-arguments
./a.go:4: undefined: test
EDIT: got my answer here: https://groups.google.com/forum/?fromgroups#!topic/golang-nuts/qysy2bM_o1I
Either list all files in go run (go run a.go test.go
) or use go build
and run the resulting executable.