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import configparser |
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from typing import IO, Dict, List, Mapping, Optional |
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from .default_styles import DEFAULT_STYLES |
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from .style import Style, StyleType |
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class Theme: |
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"""A container for style information, used by :class:`~rich.console.Console`. |
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Args: |
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styles (Dict[str, Style], optional): A mapping of style names on to styles. Defaults to None for a theme with no styles. |
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inherit (bool, optional): Inherit default styles. Defaults to True. |
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""" |
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styles: Dict[str, Style] |
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def __init__( |
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self, styles: Optional[Mapping[str, StyleType]] = None, inherit: bool = True |
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): |
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self.styles = DEFAULT_STYLES.copy() if inherit else {} |
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if styles is not None: |
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self.styles.update( |
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{ |
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name: style if isinstance(style, Style) else Style.parse(style) |
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for name, style in styles.items() |
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} |
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) |
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@property |
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def config(self) -> str: |
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"""Get contents of a config file for this theme.""" |
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config = "[styles]\n" + "\n".join( |
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f"{name} = {style}" for name, style in sorted(self.styles.items()) |
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) |
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return config |
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@classmethod |
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def from_file( |
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cls, config_file: IO[str], source: Optional[str] = None, inherit: bool = True |
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) -> "Theme": |
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"""Load a theme from a text mode file. |
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Args: |
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config_file (IO[str]): An open conf file. |
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source (str, optional): The filename of the open file. Defaults to None. |
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inherit (bool, optional): Inherit default styles. Defaults to True. |
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Returns: |
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Theme: A New theme instance. |
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""" |
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config = configparser.ConfigParser() |
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config.read_file(config_file, source=source) |
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styles = {name: Style.parse(value) for name, value in config.items("styles")} |
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theme = Theme(styles, inherit=inherit) |
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return theme |
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@classmethod |
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def read( |
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cls, path: str, inherit: bool = True, encoding: Optional[str] = None |
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) -> "Theme": |
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"""Read a theme from a path. |
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Args: |
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path (str): Path to a config file readable by Python configparser module. |
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inherit (bool, optional): Inherit default styles. Defaults to True. |
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encoding (str, optional): Encoding of the config file. Defaults to None. |
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Returns: |
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Theme: A new theme instance. |
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""" |
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with open(path, encoding=encoding) as config_file: |
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return cls.from_file(config_file, source=path, inherit=inherit) |
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class ThemeStackError(Exception): |
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"""Base exception for errors related to the theme stack.""" |
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class ThemeStack: |
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"""A stack of themes. |
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Args: |
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theme (Theme): A theme instance |
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""" |
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def __init__(self, theme: Theme) -> None: |
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self._entries: List[Dict[str, Style]] = [theme.styles] |
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self.get = self._entries[-1].get |
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def push_theme(self, theme: Theme, inherit: bool = True) -> None: |
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"""Push a theme on the top of the stack. |
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Args: |
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theme (Theme): A Theme instance. |
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inherit (boolean, optional): Inherit styles from current top of stack. |
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""" |
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styles: Dict[str, Style] |
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styles = ( |
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{**self._entries[-1], **theme.styles} if inherit else theme.styles.copy() |
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) |
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self._entries.append(styles) |
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self.get = self._entries[-1].get |
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def pop_theme(self) -> None: |
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"""Pop (and discard) the top-most theme.""" |
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if len(self._entries) == 1: |
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raise ThemeStackError("Unable to pop base theme") |
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self._entries.pop() |
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self.get = self._entries[-1].get |
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if __name__ == "__main__": |
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theme = Theme() |
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print(theme.config) |
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