wehub-resource-sync
95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
from __future__ import annotations
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import os
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import select
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import sys
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import click
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if sys.platform != "win32":
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import termios
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import tty
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def _read_key() -> str:
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"""Read a single keystroke (or escape sequence) from stdin in raw mode."""
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fd = sys.stdin.fileno()
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old = termios.tcgetattr(fd)
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try:
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tty.setraw(fd)
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# `os.read` bypasses Python's stdin buffer; otherwise the BufferedReader
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# would slurp the rest of an arrow-key sequence on the first read(1) and
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# `select.select(fd)` would never see the pending bytes.
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ch = os.read(fd, 1).decode("utf-8", errors="replace")
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# Read the rest of the escape sequence only if more bytes are pending;
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# a bare Esc keypress would otherwise block here waiting for two more chars.
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if ch == "\x1b" and select.select([fd], [], [], 0.05)[0]:
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ch += os.read(fd, 2).decode("utf-8", errors="replace")
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return ch
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finally:
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termios.tcsetattr(fd, termios.TCSADRAIN, old)
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def arrow_select(prompt_text: str, options: list[str]) -> int:
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"""Render `options` and let the user pick one via arrow keys; return its index.
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Falls back to a numeric prompt on Windows or when stdio isn't a TTY.
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"""
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if sys.platform == "win32" or not (sys.stdin.isatty() and sys.stderr.isatty()):
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click.secho(prompt_text, bold=True, err=True)
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for i, opt in enumerate(options, 1):
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click.echo(f" {click.style(str(i), fg='cyan')}. {opt}", err=True)
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choice = click.prompt(
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click.style("Select", fg="cyan", bold=True),
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type=click.IntRange(1, len(options)),
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default=1,
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err=True,
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)
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return choice - 1
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click.secho(
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f"{prompt_text} (↑/↓ to navigate, Enter to select)",
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fg="cyan",
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bold=True,
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err=True,
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)
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idx = 0
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n = len(options)
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def render() -> None:
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for i, opt in enumerate(options):
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if i == idx:
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click.secho(f"❯ {opt}", fg="cyan", err=True)
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else:
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click.echo(f" {opt}", err=True)
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def rewind() -> None:
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sys.stderr.write(f"\x1b[{n}A\x1b[J")
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sys.stderr.flush()
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sys.stderr.write("\x1b[?25l") # hide cursor
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sys.stderr.flush()
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try:
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render()
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while True:
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key = _read_key()
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match key:
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case "\r" | "\n":
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rewind()
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click.secho(f"❯ {options[idx]}", fg="green", err=True)
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return idx
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case "\x03":
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rewind()
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raise click.Abort()
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case "\x1b[A" | "\x1bOA" | "k":
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idx = (idx - 1) % n
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case "\x1b[B" | "\x1bOB" | "j":
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idx = (idx + 1) % n
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case _:
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continue
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rewind()
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render()
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finally:
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sys.stderr.write("\x1b[?25h") # show cursor
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sys.stderr.flush()
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