import Foundation

func orderedListItem(in line: String) -> String? {
    guard let match = line.firstMatch(of: /^(\d+)\.\s+(.+)$/) else { return nil }
    return String(match.2)
}

/// True if a line (already outdented to its level) starts a list item at column 0.
func isListMarkerLine(_ line: String) -> Bool {
    line.hasPrefix("- ") || line.hasPrefix("+ ") || orderedListItem(in: line) != nil
}

func isIndentedContinuationLine(_ line: String) -> Bool {
    guard !line.trimmingCharacters(in: .whitespaces).isEmpty else { return false }
    guard let first = line.first else { return false }
    return first == " " || first == "\t"
}