func include()

in gotypes/weave.go [105:141]

• 35 lines of code
• 9 McCabe index (conditional complexity)

func include(file, tag string) (string, error) {
	f, err := os.Open(file)
	if err != nil {
		return "", err
	}
	defer f.Close()

	startre, err := regexp.Compile("!\\+" + tag + "$")
	if err != nil {
		return "", err
	}
	endre, err := regexp.Compile("!\\-" + tag + "$")
	if err != nil {
		return "", err
	}

	var text bytes.Buffer
	in := bufio.NewScanner(f)
	var on bool
	for in.Scan() {
		line := in.Text()
		switch {
		case startre.MatchString(line):
			on = true
		case endre.MatchString(line):
			on = false
		case on:
			text.WriteByte('\t')
			text.WriteString(line)
			text.WriteByte('\n')
		}
	}
	if text.Len() == 0 {
		return "", fmt.Errorf("no lines of %s matched tag %q", file, tag)
	}
	return text.String(), nil
}