mirror/go-patterns
1
0
Fork 0
mirror of https://github.com/tmrts/go-patterns.git synced 2024-11-25 06:26:06 +03:00
Code Issues Projects Releases Wiki Activity

Fix functional options example

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
idiom/functional-options.md
View File

@ -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
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)
}
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())
}
```