tailscale/util/lineread/lineread.go

34 lines
769 B
Go

// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package lineread reads lines from files. It's not fancy, but it got repetitive.
package lineread
import (
"bufio"
"io"
"os"
)
// File opens name and calls fn for each line. It returns an error if the Open failed
// or once fn returns an error.
func File(name string, fn func(line []byte) error) error {
f, err := os.Open(name)
if err != nil {
return err
}
defer f.Close()
return Reader(f, fn)
}
func Reader(r io.Reader, fn func(line []byte) error) error {
bs := bufio.NewScanner(r)
for bs.Scan() {
if err := fn(bs.Bytes()); err != nil {
return err
}
}
return bs.Err()
}