135 lines
4.6 KiB
Python
135 lines
4.6 KiB
Python
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from typing import Union
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from .align import AlignMethod
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from .cells import cell_len, set_cell_size
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from .console import Console, ConsoleOptions, RenderResult
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from .jupyter import JupyterMixin
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from .measure import Measurement
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from .style import Style
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from .text import Text
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class Rule(JupyterMixin):
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"""A console renderable to draw a horizontal rule (line).
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Args:
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title (Union[str, Text], optional): Text to render in the rule. Defaults to "".
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characters (str, optional): Character(s) used to draw the line. Defaults to "─".
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style (StyleType, optional): Style of Rule. Defaults to "rule.line".
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end (str, optional): Character at end of Rule. defaults to "\\\\n"
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align (str, optional): How to align the title, one of "left", "center", or "right". Defaults to "center".
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"""
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def __init__(
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self,
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title: Union[str, Text] = "",
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*,
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characters: str = "─",
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style: Union[str, Style] = "rule.line",
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end: str = "\n",
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align: AlignMethod = "center",
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) -> None:
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if cell_len(characters) < 1:
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raise ValueError(
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"'characters' argument must have a cell width of at least 1"
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)
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if align not in ("left", "center", "right"):
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raise ValueError(
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f'invalid value for align, expected "left", "center", "right" (not {align!r})'
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)
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self.title = title
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self.characters = characters
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self.style = style
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self.end = end
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self.align = align
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def __repr__(self) -> str:
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return f"Rule({self.title!r}, {self.characters!r})"
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def __rich_console__(
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self, console: Console, options: ConsoleOptions
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) -> RenderResult:
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width = options.max_width
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# Python3.6 doesn't have an isascii method on str
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isascii = getattr(str, "isascii", None) or (
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lambda s: all(ord(c) < 128 for c in s)
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)
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characters = (
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"-"
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if (options.ascii_only and not isascii(self.characters))
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else self.characters
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)
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chars_len = cell_len(characters)
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if not self.title:
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yield self._rule_line(chars_len, width)
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return
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if isinstance(self.title, Text):
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title_text = self.title
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else:
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title_text = console.render_str(self.title, style="rule.text")
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title_text.plain = title_text.plain.replace("\n", " ")
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title_text.expand_tabs()
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required_space = 4 if self.align == "center" else 2
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truncate_width = max(0, width - required_space)
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if not truncate_width:
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yield self._rule_line(chars_len, width)
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return
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rule_text = Text(end=self.end)
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if self.align == "center":
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title_text.truncate(truncate_width, overflow="ellipsis")
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side_width = (width - cell_len(title_text.plain)) // 2
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left = Text(characters * (side_width // chars_len + 1))
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left.truncate(side_width - 1)
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right_length = width - cell_len(left.plain) - cell_len(title_text.plain)
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right = Text(characters * (side_width // chars_len + 1))
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right.truncate(right_length)
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rule_text.append(left.plain + " ", self.style)
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rule_text.append(title_text)
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rule_text.append(" " + right.plain, self.style)
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elif self.align == "left":
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title_text.truncate(truncate_width, overflow="ellipsis")
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rule_text.append(title_text)
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rule_text.append(" ")
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rule_text.append(characters * (width - rule_text.cell_len), self.style)
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elif self.align == "right":
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title_text.truncate(truncate_width, overflow="ellipsis")
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rule_text.append(characters * (width - title_text.cell_len - 1), self.style)
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rule_text.append(" ")
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rule_text.append(title_text)
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rule_text.plain = set_cell_size(rule_text.plain, width)
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yield rule_text
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def _rule_line(self, chars_len: int, width: int) -> Text:
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rule_text = Text(self.characters * ((width // chars_len) + 1), self.style)
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rule_text.truncate(width)
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rule_text.plain = set_cell_size(rule_text.plain, width)
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return rule_text
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def __rich_measure__(
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self, console: Console, options: ConsoleOptions
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) -> Measurement:
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return Measurement(1, 1)
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if __name__ == "__main__": # pragma: no cover
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import sys
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from rich.console import Console
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try:
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text = sys.argv[1]
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except IndexError:
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text = "Hello, World"
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console = Console()
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console.print(Rule(title=text))
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console = Console()
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console.print(Rule("foo"), width=4)
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