import kutil
import klammer_base
import phases

class Document(klammer_base.Klammer_base):
    def __init__(self, K):
        super().__init__(K)
        if self.files:
            raise Exception("The :files option is not defined for the 'txt' target")

    def html(self):
        raise Exception("Implemented by document.cpp")

    def tex(self):
        raise Exception("Implemented by document.cpp")

    def txt(self):
        # The document marker: section numbering under txt is a document
        # service, and the numbering phase numbers only when it finds this
        # at the head of the text (a fragment, as kdesc renders, has none).
        result = phases.txt_document_marker() + "\n"
        if self.title:
            result += f"@b {self.title} @ @nl@\n"
            if self.subtitle:
                result += f"@b {self.subtitle} @ @nl@\n"
            result += "\n"
        if self.author:
            result += f"@i {self.author} @ @nl@\n"
        if self.date:
            result += f"@i {self.date} @ @nl@\n"
        result += "\n"
        result += self.text
        return result