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main.go
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main.go
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package main
import (
"fmt"
"io/fs"
"os"
)
func main() {
Sample("ReadDir", ReadDir)
Sample("ReadFile", ReadFile)
Sample("Glob", Glob)
Sample("Stat", Stat)
Sample("Sub", Sub)
Sample("ValidPath", ValidPath)
Sample("WalkDir", WalkDir)
}
func ReadDir() {
dirFs := os.DirFS("test")
dirs, err := fs.ReadDir(dirFs, ".")
if err != nil {
fmt.Println("error:", err)
}
for _, entry := range dirs {
fmt.Println(entry.Name())
}
/*
test.txt
two
*/
}
func ReadFile() {
dirFs := os.DirFS("test")
content, err := fs.ReadFile(dirFs, "test.txt")
if err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%s\n", content) // Hello, there!
}
func Glob() {
dirFs := os.DirFS("test")
matches, err := fs.Glob(dirFs, "*.txt")
if err != nil {
fmt.Println("error:", err)
}
fmt.Println(matches) // [test.txt]
}
func Stat() {
dirFs := os.DirFS("test")
file, err := fs.Stat(dirFs, "test.txt")
if err != nil {
fmt.Println("error:", err)
}
fmt.Println(file.Name(), file.Size()) // test.txt 13
}
func Sub() {
dirFs := os.DirFS(".")
sub, err := fs.Sub(dirFs, "test")
if err != nil {
fmt.Println("error:", err)
}
file, err := sub.Open("test.txt")
if err != nil {
fmt.Println("error:", err)
}
defer file.Close()
info, err := file.Stat()
if err != nil {
fmt.Println("error:", err)
}
fmt.Println(info.Name(), info.Size()) // test.txt 13
}
func ValidPath() {
fn := func(p string) {
fmt.Printf("%s -> %t\n", p, fs.ValidPath(p))
}
fn("test") // true
fn("test/test.txt") // true
fn("example") // true
fn("../") // false
fn(".") // true
}
func WalkDir() {
dirFs := os.DirFS("test")
fs.WalkDir(dirFs, "two/two.json", func(path string, d fs.DirEntry, err error) error {
if err != nil {
fmt.Printf("prevent panic by handling failure accessing a path %q: %v\n", path, err)
return err
}
fmt.Printf("visited file or dir: %q\n", path) // visited file or dir: "two/two.json"
return nil
})
}
func Sample(name string, fn func()) {
fmt.Println(">", name)
fn()
fmt.Println()
}