All package import paths must be valid Go Modules path except packages from standard library.

Generally, there are four types of packages a source file could import:

1. Packages from standard library

2. Third-party packages

3. Packages in the same organization but not in the same repository

4. Packages in the same repository

Basic rules:

- Use different groups to separate import paths by an blank line for two or more types of packages.

- Must not use `.` to simplify import path except in test files (`*_test.go`).

- Must not use relative path (`./subpackage`) as import path.

Here is a concrete example:

import (

"fmt"

"html/template"

"net/http"

"os"

"github.com/urfave/cli"

"gopkg.in/macaron.v1"

"github.com/gogs/git-module"

"github.com/gogs/gogs/internal/route"

"github.com/gogs/gogs/internal/route/repo"

"github.com/gogs/gogs/internal/route/user"

)