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115 lines
3.7 KiB
115 lines
3.7 KiB
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__": # pragma: no cover
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theme = Theme()
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print(theme.config)
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