Function loadBackgroundFile

cmd/opencodereview/background_file.go:46–94

(path string)

}

func loadBackgroundFile(path string) (string, error) {
	info, err := os.Stat(path)
	if err != nil {
		return "", fmt.Errorf("read background file %q: %w", path, err)
	}
	if info.IsDir() {
		return "", fmt.Errorf("background file %q is a directory, not a file", path)
	}
	if info.Size() > maxBackgroundFileBytes {
		return "", fmt.Errorf(
			"background file %q is %d bytes, exceeding the maximum of %d bytes; please provide a smaller file",
			path, info.Size(), maxBackgroundFileBytes,
		)
	}

	raw, err := os.ReadFile(path)
	if err != nil {
		return "", fmt.Errorf("read background file %q: %w", path, err)
	}

	cleaned := sanitizeMarkdown(string(raw))
	if cleaned == "" {
		return "", fmt.Errorf("background file %q is empty after sanitisation", path)
	}

	if strings.Contains(cleaned, backgroundOpenTag) || strings.Contains(cleaned, backgroundCloseTag) {
		return "", fmt.Errorf(
			"background file %q must not contain the reserved delimiters %q or %q",
			path, backgroundOpenTag, backgroundCloseTag,
		)
	}

	// Enforce the limits on the cleaned content only: the wrapper delimiters add
	// overhead the user cannot control, so counting them would make the reported
	// character count misleading.
	if n := len([]rune(cleaned)); n > backgroundHardLimit {
		return "", fmt.Errorf(
			"background content is %d characters, exceeding the hard limit of %d (aborting)",
			n, backgroundHardLimit,
		)
	} else if n > backgroundSoftLimit {
		fmt.Fprintf(os.Stderr,
			"[ocr] --background-file content is %d characters, exceeding the recommended %d (continuing but review quality might be impacted)\n",
			n, backgroundSoftLimit,
		)
	}

	return backgroundOpenTag + "\n" + cleaned + "\n" + backgroundCloseTag, nil
}

func sanitizeMarkdown(s string) string {
	var b strings.Builder