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