// go run v1.go -- 10 v1.go
package main

import (
	"bufio"
	"flag"
	"fmt"
	"os"
)

// START OMIT
func lineCount(path string) (int, error) {
	f, err := os.Open(path)
	if err != nil {
		return 0, err
	}
	defer f.Close()
	r := bufio.NewReader(f)
	var lc int
	for err == nil {
		_, err = r.ReadString('\n')
		if err == nil { // HLerrhandling
			lc++ // HLerrhandling
		} // HLerrhandling
	}
	return lc, nil
}

// END OMIT

func main() {
	flag.Parse()
	for _, path := range flag.Args() {
		lc, err := lineCount(path)
		if err != nil {
			fmt.Errorf("failed to count lines in %q: %s", path, err)
		}
		fmt.Printf("%d\t%s\n", lc, path)
	}
}