NFDをNFCにする

nfd2nfc.go

package main

import (
	"flag"
	"io"
	"log"
	"os"

	"golang.org/x/text/transform"
	"golang.org/x/text/unicode/norm"
)

func trans(w io.Writer, r io.Reader) error {
	tr := transform.NewReader(r, norm.NFC)
	if _, err := io.Copy(w, tr); err != nil {
		return err
	}
	return nil
}

func run(args []string) error {
	if len(args) == 0 {
		return trans(os.Stdout, os.Stdin)
	}

	for _, fname := range flag.Args() {
		f, err := os.Open(fname)
		if err != nil {
			return err
		}
		defer f.Close()
		return trans(os.Stdout, f)
	}

	return nil
}

func main() {
	flag.Parse()
	if err := run(flag.Args()); err != nil {
		log.Fatal(err)
	}
}