How can I "go run" a project with multiple files in the main package?
GoPackageGo Problem Overview
I have a single file in the main
package called main.go
. Because the code isn't reusable I want to separate part of the code in a different file but in the same package.
How do I split the contents of main.go
into multiple files without creating a separate package?
I want a directory structure like this:
ls foo
# output:
main.go
bar.go
- File:
bar.go
package main
import "fmt"
func Bar() {
fmt.Println("Bar")
}
- File:
main.go
package main
func main() {
Bar()
}
When I run go run main.go
, it gives me:
# command-line-arguments
./main.go:4:2: undefined: Bar
Go Solutions
Solution 1 - Go
Update 26th July 2019 (for go >=1.11)
go run .
Will work on windows as well.
Original answer (for non windows environments)
The code actually works. The problem was that instead of running go run main.go
I should run:
go run *.go
Solution 2 - Go
Update August 2018, with Go 1.11, a section "Run" states:
> The go run
command now allows a single import path, a directory name or a pattern matching a single package.
This allows go run pkg
or go run dir
, most importantly go run .
Original answer Jan. 2015
As mentioned in "How to compile Go program consisting of multiple files?", go run
expects a list of files, since it "compiles and runs the main
package comprising the named Go source files".
So you certainly can split your main
package in several files with go run
.
That differs from go build/go install
which expect package names (and not go filenames).
A simple go build
would produce an executable named after the parent folder.
Note that, as illustrated by this thread, a go run *.go
wouldn't work in a Windows CMD session, since the shell doesn't do wildcard expansion.
Solution 3 - Go
In my opinion, the best answer to this question is hidden in the comments to the top answer.
Just run this:
go run .
This will run all the files in main package, but will not give an error message like
go run: cannot run *_test.go files (main_test.go)
Kudos to @BarthesSimpson
Solution 4 - Go
As mentioned, you can say go run *.go
but for Windows you can just list the script files (since *.go won't work) - go run main.go other.go third.go
Solution 5 - Go
The first method to do so will be to run
go run *.go
The another method is to generate an exe file
go build
Then run that .exe file
./filename.exe
Solution 6 - Go
For Windows install Cygwin and use it instead of command prompt. "go run *.go" will work then.
Solution 7 - Go
If you are trying to run multiple files on localhost using gorilla mux in go as per latest version(1.11). Try using any of the following 2 commands.
> 1. go install && FolderName -port 8081 . > > 2. go build && ./FolderName -port 8081.
Make sure that you are in the source folder ie go/src/FolderName before executing the command in the Terminal.