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main.go
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main.go
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package main
import (
"flag"
"fmt"
"io/fs"
"io/ioutil"
"os"
"strings"
)
func main() {
flag.Parse()
if flag.NArg() < 1 {
fmt.Println("Usage: words-cli ")
return
}
fsProvider := os.DirFS("/")
target := flag.Arg(0)
words, err := readWordsFromFileV2(fsProvider, target)
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
for _, word := range words {
fmt.Println(word)
}
}
func readWordsFromFile(path string) ([]string, error) {
content, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("read file: %v", err)
}
return strings.Fields(string(content)), nil
}
func readWordsFromFileV2(f fs.FS, path string) ([]string, error) {
content, err := fs.ReadFile(f, path)
if err != nil {
return nil, fmt.Errorf("read file: %v", err)
}
return strings.Fields(string(content)), nil
}