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Fix functional options example

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This commit is contained in:
Eddy Josue Hernandez 2019-10-21 21:01:48 -06:00
parent f978e42036
commit 31f4a85605
1 changed files with 23 additions and 13 deletions
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36
idiom/functional-options.md
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@ -50,7 +50,7 @@ func Permissions(perms os.FileMode) Option {
```go
package file
func New(filepath string, setters ...Option) error {
func New(filepath string, setters ...Option) (*os.File, error) {
// Default Options
args := &Options{
UID: os.Getuid(),
@ -66,29 +66,39 @@ func New(filepath string, setters ...Option) error {
f, err := os.OpenFile(filepath, args.Flags, args.Permissions)
if err != nil {
return err
} else {
defer f.Close()
return nil, err
}
defer f.Close()
if _, err := f.WriteString(args.Contents); err != nil {
return err
return nil, err
}
return f.Chown(args.UID, args.GID)
f.Chown(args.UID, args.GID)
return f, nil
}
```
## Usage
```go
emptyFile, err := file.New("/tmp/empty.txt")
if err != nil {
panic(err)
}
func main() {
emptyFile, err := file.New("/tmp/empty.txt")
if err != nil {
panic(err)
}
fmt.Printf("file %v created\n", emptyFile.Name())
fillerFile, err := file.New("/tmp/file.txt", file.UID(1000), file.Contents("Lorem Ipsum Dolor Amet"))
if err != nil {
panic(err)
fillerFile, err := file.New("/tmp/file.txt", file.UID(1000), file.Contents("Lorem Ipsum Dolor Amet"))
if err != nil {
panic(err)
}
fmt.Printf("file %v created\n", fillerFile.Name())
filePermissions, err := file.New("/tmp/file-permissions.txt", file.Permissions(0777), file.Contents("With Permissions 0777"))
if err != nil {
panic(err)
}
fmt.Printf("file %v created\n", filePermissions.Name())
}
```