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template.go
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template.go
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package template
import (
"errors"
"fmt"
"os"
)
const (
directoryPermissions = 0o755
filePermissions = 0o644
)
var (
errDirectoryNotProvided = errors.New("directory not provided")
errDirectoryAlreadyExists = errors.New("directory already exists")
)
func NewData(directory string) *Data {
return &Data{
Directory: directory,
}
}
func Generate(directory string) error {
if err := ensureDirectory(directory); err != nil {
return fmt.Errorf("%w (%s)", err, directory)
}
filenames, err := getAllFilenames()
if err != nil {
return err
}
templateData := NewData(directory)
for _, filename := range filenames {
if err = create(*templateData, filename); err != nil {
return err
}
}
return nil
}
func create(data Data, filename string) error {
tpl, err := GetTemplate(filename)
if err != nil {
return err
}
file, err := openFile(data.Directory, filename)
if err != nil {
return err
}
fmt.Println("Generating " + filename + "...")
return tpl.Execute(file, data)
}
func ensureDirectory(directory string) error {
if directory == "" {
return errDirectoryNotProvided
}
// check if directory exists
_, err := os.Stat(directory)
if !os.IsNotExist(err) {
return errDirectoryAlreadyExists
}
return os.MkdirAll(directory, directoryPermissions)
}
func openFile(directory, name string) (*os.File, error) {
return os.OpenFile(directory+"/"+name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, filePermissions)
}