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generate_offline.go
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/
generate_offline.go
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package off
import (
"errors"
"io/fs"
"os"
"os/exec"
"github.com/dave/jennifer/jen"
)
type OfflineGenerator struct {
ProjectName string
}
func (off *OfflineGenerator) Generate() error {
if off.ProjectName == "" {
return errors.New("project name must be identified, please use -p flag")
}
if err := off.genGoMod(off.ProjectName); err != nil {
return err
}
return off.genMainFile()
}
func (off *OfflineGenerator) genGoMod(projectName string) error {
if _, err := os.Stat(projectName); !errors.Is(err, fs.ErrNotExist) {
return fs.ErrExist
}
if err := os.Mkdir(projectName, 0755); err != nil {
return err
}
if err := os.Chdir(projectName); err != nil {
return err
}
cmd := exec.Command("go", "mod", "init", projectName)
return cmd.Run()
}
func (off *OfflineGenerator) genMainFile() error {
mainFile := jen.NewFilePath("main")
mainFile.Func().Id("main").Params().Block(
jen.Qual("github.com/nkien0204/lets-go/cmd", "Execute").Call(),
)
return mainFile.Save("main.go")
}