使用私有支持文件组织多文件Go项目

Question

Following this answer I have created the following project structure:

.
├── bin
├── pkg
└── src
    └── github.com
        └── GITHUB_USERNAME
            └── PROJECTNAME
                ├── lib
                │   └── model.go
                │   └── ... .go
                ├── LICENSE
                ├── README.md
                └── PROJECTNAME.go

• PROJECTNAME.go has the package main
• model.go has the package PROJECTNAME

In the PROJECTNAME.go I am importing the follwing:

import(
    'github.com/GITHUB_USERNAME/PROJECTNAME/lib/model'
) 

but when I run go build I get the follwing error:

 cannot find package "github.com/GITHUB_USERNAME/PROJECTNAME/lib/model" in any of:
    /usr/lib/go/src/pkg/github.com/GITHUB_USERNAME/PROJECTNAME/lib/model (from $GOROOT)
    /home/USERNAME/go/src/github.com/GITHUB_USERNAME/PROJECTNAME/lib/model (from $GOPATH)

How must the packages names be to import correctly? Are there any other strategies?

Answer 1

Package import paths are defined by directory names, not file names.

The correct import path is "github.com/GITHUB_USERNAME/PROJECTNAME/lib" and all of the go files in that folder must have the same package clause at the top.

The identifier after the package clause is what identifier will be imported into the package that imports it. So if it's package foo, you can access the Bar identifier by foo.Bar in the importing code.

By convention, authors typically use the last part of the import path as the package name, so in this case, you should have package lib at the top of all of the Go files under the lib folder.