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package liturgy
import (
"fmt"
"regexp"
"strings"
)
// citationRe captures a scripture reference in a trailing "(...)" of a section
// heading, e.g. "Ewangelia (J 20, 1. 11-18)" -> "J 20, 1. 11-18".
var citationRe = regexp.MustCompile(`\((.+)\)\s*$`)
// ExtractCitation returns the scripture reference carried in a section
// heading's trailing parentheses, or an error when the heading has none.
func ExtractCitation(heading string) (string, error) {
m := citationRe.FindStringSubmatch(heading)
if m == nil {
return "", fmt.Errorf("no reference found in heading: %q", heading)
}
return strings.TrimSpace(m[1]), nil
}
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