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rich_help_formatter.py
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rich_help_formatter.py
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import sys
from typing import IO, TYPE_CHECKING, Any, Optional
import click
from rich_click.rich_help_configuration import RichHelpConfiguration
if TYPE_CHECKING:
from rich.console import Console
from rich.highlighter import Highlighter
if sys.version_info >= (3, 8):
from functools import cached_property
else:
cached_property = property
def create_console(config: RichHelpConfiguration, file: Optional[IO[str]] = None) -> "Console":
"""
Create a Rich Console configured from Rich Help Configuration.
Args:
----
config: Rich Help Configuration instance
file: Optional IO stream to write Rich Console output
Defaults to None.
"""
from rich.console import Console
from rich.theme import Theme
console = Console(
theme=Theme(
{
"option": config.style_option,
"command": config.style_command,
"argument": config.style_argument,
"switch": config.style_switch,
"metavar": config.style_metavar,
"metavar_sep": config.style_metavar_separator,
"usage": config.style_usage,
}
),
color_system=config.color_system,
force_terminal=config.force_terminal,
file=file,
width=config.width,
legacy_windows=config.legacy_windows,
)
if isinstance(config.max_width, int):
console.width = min(config.max_width, console.size.width)
return console
class RichHelpFormatter(click.HelpFormatter):
"""
Rich Help Formatter.
This class is a container for the help configuration and Rich Console that
are used internally by the help and error printing methods.
"""
console: "Console"
"""Rich Console created from the help configuration.
This console is meant only for use with the formatter and should
not be created directly
"""
def __init__(
self,
indent_increment: int = 2,
width: Optional[int] = None,
max_width: Optional[int] = None,
*args: Any,
console: Optional["Console"] = None,
config: Optional[RichHelpConfiguration] = None,
file: Optional[IO[str]] = None,
**kwargs: Any,
) -> None:
"""
Create Rich Help Formatter.
Args:
----
indent_increment: Passed to click.HelpFormatter.
width: Passed to click.HelpFormatter. Overrides config.width if not None.
max_width: Passed to click.HelpFormatter. Overrides config.max_width if not None.
*args: Args passed to click.HelpFormatter.
console: Use an external console.
config: RichHelpConfiguration. If None, then build config from globals.
file: Stream to output to in the Rich Console. If None, use stdout.
**kwargs: Kwargs passed to click.HelpFormatter.
"""
if config is not None:
self.config = config
# Rich config overrides width and max width if set.
else:
self.config = RichHelpConfiguration.load_from_globals()
self.console = console or create_console(self.config, file=file)
# TODO: Revisit this. I don't think this does anything.
if width is None:
width = self.config.width
if max_width is None:
max_width = self.config.max_width
super().__init__(indent_increment, width, max_width, *args, **kwargs)
@cached_property
def highlighter(self) -> "Highlighter":
if self.config.highlighter is not None:
return self.config.highlighter
else:
from rich.highlighter import RegexHighlighter
class HighlighterClass(RegexHighlighter):
highlights = self.config.highlighter_patterns
return HighlighterClass()
def write(self, *objects: Any, **kwargs: Any) -> None:
self.console.print(*objects, **kwargs)
def write_usage(self, prog: str, args: str = "", prefix: Optional[str] = None) -> None:
from rich_click.rich_help_rendering import get_rich_usage
get_rich_usage(formatter=self, prog=prog, args=args, prefix=prefix)
def write_abort(self) -> None:
"""Print richly formatted abort error."""
self.console.print(self.config.aborted_text, style=self.config.style_aborted)