mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-05 07:55:36 +00:00
34 lines
769 B
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()
|
|
}
|