blob: a80313978db659fbad26eebe485193bb697cb0f1 [file] [log] [blame]
// Copyright 2021 The Go 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 internal
import (
"bufio"
"os"
"strings"
"golang.org/x/pkgsite/internal/derrors"
)
// Readfilelines reads and returns the lines from a file.
// Whitespace on each line is trimmed.
// Blank lines and lines beginning with '#' are ignored.
func ReadFileLines(filename string) (lines []string, err error) {
defer derrors.Wrap(&err, "ReadFileLines(%q)", filename)
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
line := strings.TrimSpace(s.Text())
if line == "" || strings.HasPrefix(line, "#") {
continue
}
lines = append(lines, line)
}
if s.Err() != nil {
return nil, s.Err()
}
return lines, nil
}