cd0ca95877
Center the text in the window and allow pressing enter/esc when doing a yes/no question Fixes #4545
302 lines
9.1 KiB
Python
302 lines
9.1 KiB
Python
#!/usr/bin/env python3
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# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
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import os
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import sys
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from contextlib import suppress
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from typing import TYPE_CHECKING, Dict, List, NamedTuple, Optional, Tuple
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from kitty.cli import parse_args
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from kitty.cli_stub import AskCLIOptions
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from kitty.constants import cache_dir
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from kitty.fast_data_types import truncate_point_for_length, wcswidth
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from kitty.typing import BossType, KeyEventType, TypedDict
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from kitty.utils import ScreenSize
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from ..tui.handler import Handler, result_handler
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from ..tui.loop import Loop, MouseEvent
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from ..tui.operations import MouseTracking, alternate_screen, styled
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if TYPE_CHECKING:
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import readline
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else:
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readline = None
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def get_history_items() -> List[str]:
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return list(map(readline.get_history_item, range(1, readline.get_current_history_length() + 1)))
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def sort_key(item: str) -> Tuple[int, str]:
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return len(item), item.lower()
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class HistoryCompleter:
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def __init__(self, name: Optional[str] = None):
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self.matches: List[str] = []
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self.history_path = None
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if name:
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ddir = os.path.join(cache_dir(), 'ask')
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with suppress(FileExistsError):
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os.makedirs(ddir)
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self.history_path = os.path.join(ddir, name)
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def complete(self, text: str, state: int) -> Optional[str]:
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response = None
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if state == 0:
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history_values = get_history_items()
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if text:
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self.matches = sorted(
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(h for h in history_values if h and h.startswith(text)), key=sort_key)
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else:
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self.matches = []
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try:
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response = self.matches[state]
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except IndexError:
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response = None
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return response
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def __enter__(self) -> 'HistoryCompleter':
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if self.history_path:
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with suppress(Exception):
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readline.read_history_file(self.history_path)
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readline.set_completer(self.complete)
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return self
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def __exit__(self, *a: object) -> None:
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if self.history_path:
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readline.write_history_file(self.history_path)
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def option_text() -> str:
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return '''\
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--type -t
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choices=line,yesno,choices
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default=line
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Type of input. Defaults to asking for a line of text.
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--message -m
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The message to display to the user. If not specified a default
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message is shown.
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--name -n
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The name for this question. Used to store history of previous answers which can
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be used for completions and via the browse history readline bindings.
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--choice -c
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type=list
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dest=choices
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A choice for the choices type. Every choice has the syntax: letter:text Where
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letter is the accelerator key and text is the corresponding text. There can be
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an optional color specification after the letter to indicate what color it should
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be.
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For example: y:Yes and n;red:No
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'''
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class Response(TypedDict):
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items: List[str]
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response: Optional[str]
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class Choice(NamedTuple):
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text: str
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idx: int
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color: str
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class Range(NamedTuple):
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start: int
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end: int
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y: int
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def has_point(self, x: int, y: int) -> bool:
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return y == self.y and self.start <= x <= self.end
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def truncate_at_space(text: str, width: int) -> Tuple[str, str]:
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p = truncate_point_for_length(text, width)
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i = text.rfind(' ', 0, p + 1)
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if i > 0 and p - i < 12:
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p = i + 1
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return text[:p], text[p:]
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class Choose(Handler):
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mouse_tracking = MouseTracking.buttons_only
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def __init__(self, cli_opts: AskCLIOptions) -> None:
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self.cli_opts = cli_opts
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self.response = 'n' if cli_opts.type == 'yesno' else ''
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self.allowed = frozenset('yn')
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self.choices: Dict[str, Choice] = {}
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self.clickable_ranges: Dict[str, Range] = {}
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if cli_opts.type != 'yesno':
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allowed = []
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for choice in cli_opts.choices:
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color = 'green'
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letter, text = choice.split(':', maxsplit=1)
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if ';' in letter:
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letter, color = letter.split(';', maxsplit=1)
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letter = letter.lower()
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idx = text.lower().index(letter)
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allowed.append(letter)
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self.choices[letter] = Choice(text, idx, color)
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self.allowed = frozenset(allowed)
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def initialize(self) -> None:
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self.cmd.set_cursor_visible(False)
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self.draw_screen()
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def finalize(self) -> None:
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self.cmd.set_cursor_visible(True)
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def draw_long_text(self, text: str) -> int:
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y = 0
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width = self.screen_size.cols - 2
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while text:
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t, text = truncate_at_space(text, width)
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y += 1
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extra = 1 + ((width - wcswidth(t)) // 2)
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self.cmd.styled(' ' * extra + t, bold=True)
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self.print()
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return y
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@Handler.atomic_update
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def draw_screen(self) -> None:
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self.cmd.clear_screen()
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y = max(0, self.screen_size.rows // 2 - 2)
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self.print(end='\r\n'*y)
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if self.cli_opts.message:
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y += self.draw_long_text(self.cli_opts.message)
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self.print()
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y += 1
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if self.cli_opts.type == 'yesno':
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self.draw_yesno(y)
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else:
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self.draw_choice(y)
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def draw_choice(self, y: int) -> None:
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self.clickable_ranges.clear()
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current_line = ''
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current_ranges: Dict[str, int] = {}
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width = self.screen_size.cols - 2
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def commit_line() -> None:
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nonlocal current_line, y
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extra = (width - wcswidth(current_line)) // 2
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x = extra + 1
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self.print(' ' * x + current_line)
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for letter, sz in current_ranges.items():
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self.clickable_ranges[letter] = Range(x, x + sz - 3, y)
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x += sz
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current_ranges.clear()
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y += 1
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current_line = ''
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for letter, choice in self.choices.items():
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text = choice.text[:choice.idx]
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text += styled(choice.text[choice.idx], fg=choice.color)
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text += choice.text[choice.idx + 1:]
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text += ' '
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sz = wcswidth(text)
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if sz + wcswidth(current_line) >= width:
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commit_line()
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current_line += text
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current_ranges[letter] = sz
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if current_line:
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commit_line()
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def draw_yesno(self, y: int) -> None:
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sep = ' ' * 3
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yes = styled('Y', fg='green') + 'es'
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no = styled('N', fg='red') + 'o'
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text = yes + sep + no
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w = wcswidth(text)
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extra = (self.screen_size.cols - w) // 2
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x = extra
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nx = x + wcswidth(yes) + len(sep)
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self.clickable_ranges = {'y': Range(x, x + wcswidth(yes) - 1, y), 'n': Range(nx, nx + 1, y)}
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self.print(' ' * extra + text)
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def on_text(self, text: str, in_bracketed_paste: bool = False) -> None:
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text = text.lower()
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if text in self.allowed:
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self.response = text
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self.quit_loop(0)
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def on_key(self, key_event: KeyEventType) -> None:
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if self.cli_opts.type == 'yesno':
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if key_event.matches('esc'):
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self.on_text('n')
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elif key_event.matches('enter'):
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self.on_text('y')
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def on_click(self, ev: MouseEvent) -> None:
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for letter, r in self.clickable_ranges.items():
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if r.has_point(ev.cell_x, ev.cell_y):
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self.response = letter
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self.quit_loop(0)
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break
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def on_resize(self, screen_size: ScreenSize) -> None:
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self.screen_size = screen_size
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self.draw_screen()
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def on_interrupt(self) -> None:
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self.quit_loop(1)
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on_eot = on_interrupt
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def main(args: List[str]) -> Response:
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# For some reason importing readline in a key handler in the main kitty process
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# causes a crash of the python interpreter, probably because of some global
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# lock
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global readline
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msg = 'Ask the user for input'
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try:
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cli_opts, items = parse_args(args[1:], option_text, '', msg, 'kitty ask', result_class=AskCLIOptions)
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except SystemExit as e:
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if e.code != 0:
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print(e.args[0])
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input('Press enter to quit...')
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raise SystemExit(e.code)
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if cli_opts.type in ('yesno', 'choices'):
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loop = Loop()
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handler = Choose(cli_opts)
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loop.loop(handler)
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return {'items': items, 'response': handler.response}
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import readline as rl
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readline = rl
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from kitty.shell import init_readline
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init_readline()
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response = None
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with alternate_screen(), HistoryCompleter(cli_opts.name):
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if cli_opts.message:
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print(styled(cli_opts.message, bold=True))
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prompt = '> '
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with suppress(KeyboardInterrupt, EOFError):
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response = input(prompt)
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return {'items': items, 'response': response}
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@result_handler()
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def handle_result(args: List[str], data: Response, target_window_id: int, boss: BossType) -> None:
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if data['response'] is not None:
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func, *args = data['items']
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getattr(boss, func)(data['response'], *args)
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if __name__ == '__main__':
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ans = main(sys.argv)
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if ans:
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print(ans)
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