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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
// 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)
}
// Reader calls fn for each line.
// If fn returns an error, Reader stops reading and returns that error.
// Reader may also return errors encountered reading and parsing from r.
// To stop reading early, use a sentinel "stop" error value and ignore
// it when returned from Reader.
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()
}
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