def update_char_format(
baseformat: QTextCharFormat,
color: Optional[_Color] = None,
background: Optional[_Color] = None,
weight: Optional[int] = None,
italic: Optional[bool] = None,
underline: Optional[bool] = None,
font: Optional[QFont] = None
) -> QTextCharFormat:
"""
Return a copy of `baseformat` :class:`QTextCharFormat` with
updated color, weight, background and font properties.
"""
charformat = QTextCharFormat(baseformat)
if color is not None:
charformat.setForeground(color)
if background is not None:
charformat.setBackground(background)
if font is not None:
assert weight is None and italic is None and underline is None
charformat.setFont(font)
else:
if weight is not None:
charformat.setFontWeight(weight)
if italic is not None:
charformat.setFontItalic(italic)
if underline is not None:
charformat.setFontUnderline(underline)
return charformat
