329 lines
8.4 KiB
Python
329 lines
8.4 KiB
Python
|
import os
|
||
|
|
import signal
|
||
|
|
import sys
|
||
|
|
import threading
|
||
|
|
from collections import deque
|
||
|
|
from typing import (
|
||
|
|
Callable,
|
||
|
|
ContextManager,
|
||
|
|
Deque,
|
||
|
|
Dict,
|
||
|
|
Generator,
|
||
|
|
Generic,
|
||
|
|
List,
|
||
|
|
Optional,
|
||
|
|
TypeVar,
|
||
|
|
Union,
|
||
|
|
)
|
||
|
|
|
||
|
|
from wcwidth import wcwidth
|
||
|
|
|
||
|
|
__all__ = [
|
||
|
|
"Event",
|
||
|
|
"DummyContext",
|
||
|
|
"get_cwidth",
|
||
|
|
"suspend_to_background_supported",
|
||
|
|
"is_conemu_ansi",
|
||
|
|
"is_windows",
|
||
|
|
"in_main_thread",
|
||
|
|
"get_bell_environment_variable",
|
||
|
|
"get_term_environment_variable",
|
||
|
|
"take_using_weights",
|
||
|
|
"to_str",
|
||
|
|
"to_int",
|
||
|
|
"AnyFloat",
|
||
|
|
"to_float",
|
||
|
|
"is_dumb_terminal",
|
||
|
|
]
|
||
|
|
|
||
|
|
# Used to ensure sphinx autodoc does not try to import platform-specific
|
||
|
|
# stuff when documenting win32.py modules.
|
||
|
|
SPHINX_AUTODOC_RUNNING = "sphinx.ext.autodoc" in sys.modules
|
||
|
|
|
||
|
|
_Sender = TypeVar("_Sender", covariant=True)
|
||
|
|
|
||
|
|
|
||
|
|
class Event(Generic[_Sender]):
|
||
|
|
"""
|
||
|
|
Simple event to which event handlers can be attached. For instance::
|
||
|
|
|
||
|
|
class Cls:
|
||
|
|
def __init__(self):
|
||
|
|
# Define event. The first parameter is the sender.
|
||
|
|
self.event = Event(self)
|
||
|
|
|
||
|
|
obj = Cls()
|
||
|
|
|
||
|
|
def handler(sender):
|
||
|
|
pass
|
||
|
|
|
||
|
|
# Add event handler by using the += operator.
|
||
|
|
obj.event += handler
|
||
|
|
|
||
|
|
# Fire event.
|
||
|
|
obj.event()
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self, sender: _Sender, handler: Optional[Callable[[_Sender], None]] = None
|
||
|
|
) -> None:
|
||
|
|
self.sender = sender
|
||
|
|
self._handlers: List[Callable[[_Sender], None]] = []
|
||
|
|
|
||
|
|
if handler is not None:
|
||
|
|
self += handler
|
||
|
|
|
||
|
|
def __call__(self) -> None:
|
||
|
|
"Fire event."
|
||
|
|
for handler in self._handlers:
|
||
|
|
handler(self.sender)
|
||
|
|
|
||
|
|
def fire(self) -> None:
|
||
|
|
"Alias for just calling the event."
|
||
|
|
self()
|
||
|
|
|
||
|
|
def add_handler(self, handler: Callable[[_Sender], None]) -> None:
|
||
|
|
"""
|
||
|
|
Add another handler to this callback.
|
||
|
|
(Handler should be a callable that takes exactly one parameter: the
|
||
|
|
sender object.)
|
||
|
|
"""
|
||
|
|
# Add to list of event handlers.
|
||
|
|
self._handlers.append(handler)
|
||
|
|
|
||
|
|
def remove_handler(self, handler: Callable[[_Sender], None]) -> None:
|
||
|
|
"""
|
||
|
|
Remove a handler from this callback.
|
||
|
|
"""
|
||
|
|
if handler in self._handlers:
|
||
|
|
self._handlers.remove(handler)
|
||
|
|
|
||
|
|
def __iadd__(self, handler: Callable[[_Sender], None]) -> "Event[_Sender]":
|
||
|
|
"""
|
||
|
|
`event += handler` notation for adding a handler.
|
||
|
|
"""
|
||
|
|
self.add_handler(handler)
|
||
|
|
return self
|
||
|
|
|
||
|
|
def __isub__(self, handler: Callable[[_Sender], None]) -> "Event[_Sender]":
|
||
|
|
"""
|
||
|
|
`event -= handler` notation for removing a handler.
|
||
|
|
"""
|
||
|
|
self.remove_handler(handler)
|
||
|
|
return self
|
||
|
|
|
||
|
|
|
||
|
|
class DummyContext(ContextManager[None]):
|
||
|
|
"""
|
||
|
|
(contextlib.nested is not available on Py3)
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __enter__(self) -> None:
|
||
|
|
pass
|
||
|
|
|
||
|
|
def __exit__(self, *a: object) -> None:
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class _CharSizesCache(Dict[str, int]):
|
||
|
|
"""
|
||
|
|
Cache for wcwidth sizes.
|
||
|
|
"""
|
||
|
|
|
||
|
|
LONG_STRING_MIN_LEN = 64 # Minimum string length for considering it long.
|
||
|
|
MAX_LONG_STRINGS = 16 # Maximum number of long strings to remember.
|
||
|
|
|
||
|
|
def __init__(self) -> None:
|
||
|
|
super().__init__()
|
||
|
|
# Keep track of the "long" strings in this cache.
|
||
|
|
self._long_strings: Deque[str] = deque()
|
||
|
|
|
||
|
|
def __missing__(self, string: str) -> int:
|
||
|
|
# Note: We use the `max(0, ...` because some non printable control
|
||
|
|
# characters, like e.g. Ctrl-underscore get a -1 wcwidth value.
|
||
|
|
# It can be possible that these characters end up in the input
|
||
|
|
# text.
|
||
|
|
result: int
|
||
|
|
if len(string) == 1:
|
||
|
|
result = max(0, wcwidth(string))
|
||
|
|
else:
|
||
|
|
result = sum(self[c] for c in string)
|
||
|
|
|
||
|
|
# Store in cache.
|
||
|
|
self[string] = result
|
||
|
|
|
||
|
|
# Rotate long strings.
|
||
|
|
# (It's hard to tell what we can consider short...)
|
||
|
|
if len(string) > self.LONG_STRING_MIN_LEN:
|
||
|
|
long_strings = self._long_strings
|
||
|
|
long_strings.append(string)
|
||
|
|
|
||
|
|
if len(long_strings) > self.MAX_LONG_STRINGS:
|
||
|
|
key_to_remove = long_strings.popleft()
|
||
|
|
if key_to_remove in self:
|
||
|
|
del self[key_to_remove]
|
||
|
|
|
||
|
|
return result
|
||
|
|
|
||
|
|
|
||
|
|
_CHAR_SIZES_CACHE = _CharSizesCache()
|
||
|
|
|
||
|
|
|
||
|
|
def get_cwidth(string: str) -> int:
|
||
|
|
"""
|
||
|
|
Return width of a string. Wrapper around ``wcwidth``.
|
||
|
|
"""
|
||
|
|
return _CHAR_SIZES_CACHE[string]
|
||
|
|
|
||
|
|
|
||
|
|
def suspend_to_background_supported() -> bool:
|
||
|
|
"""
|
||
|
|
Returns `True` when the Python implementation supports
|
||
|
|
suspend-to-background. This is typically `False' on Windows systems.
|
||
|
|
"""
|
||
|
|
return hasattr(signal, "SIGTSTP")
|
||
|
|
|
||
|
|
|
||
|
|
def is_windows() -> bool:
|
||
|
|
"""
|
||
|
|
True when we are using Windows.
|
||
|
|
"""
|
||
|
|
return sys.platform == "win32" # Not 'darwin' or 'linux2'
|
||
|
|
|
||
|
|
|
||
|
|
def is_windows_vt100_supported() -> bool:
|
||
|
|
"""
|
||
|
|
True when we are using Windows, but VT100 escape sequences are supported.
|
||
|
|
"""
|
||
|
|
if sys.platform == "win32":
|
||
|
|
# Import needs to be inline. Windows libraries are not always available.
|
||
|
|
from prompt_toolkit.output.windows10 import is_win_vt100_enabled
|
||
|
|
|
||
|
|
return is_win_vt100_enabled()
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def is_conemu_ansi() -> bool:
|
||
|
|
"""
|
||
|
|
True when the ConEmu Windows console is used.
|
||
|
|
"""
|
||
|
|
return sys.platform == "win32" and os.environ.get("ConEmuANSI", "OFF") == "ON"
|
||
|
|
|
||
|
|
|
||
|
|
def in_main_thread() -> bool:
|
||
|
|
"""
|
||
|
|
True when the current thread is the main thread.
|
||
|
|
"""
|
||
|
|
return threading.current_thread().__class__.__name__ == "_MainThread"
|
||
|
|
|
||
|
|
|
||
|
|
def get_bell_environment_variable() -> bool:
|
||
|
|
"""
|
||
|
|
True if env variable is set to true (true, TRUE, TrUe, 1).
|
||
|
|
"""
|
||
|
|
value = os.environ.get("PROMPT_TOOLKIT_BELL", "true")
|
||
|
|
return value.lower() in ("1", "true")
|
||
|
|
|
||
|
|
|
||
|
|
def get_term_environment_variable() -> str:
|
||
|
|
"Return the $TERM environment variable."
|
||
|
|
return os.environ.get("TERM", "")
|
||
|
|
|
||
|
|
|
||
|
|
_T = TypeVar("_T")
|
||
|
|
|
||
|
|
|
||
|
|
def take_using_weights(
|
||
|
|
items: List[_T], weights: List[int]
|
||
|
|
) -> Generator[_T, None, None]:
|
||
|
|
"""
|
||
|
|
Generator that keeps yielding items from the items list, in proportion to
|
||
|
|
their weight. For instance::
|
||
|
|
|
||
|
|
# Getting the first 70 items from this generator should have yielded 10
|
||
|
|
# times A, 20 times B and 40 times C, all distributed equally..
|
||
|
|
take_using_weights(['A', 'B', 'C'], [5, 10, 20])
|
||
|
|
|
||
|
|
:param items: List of items to take from.
|
||
|
|
:param weights: Integers representing the weight. (Numbers have to be
|
||
|
|
integers, not floats.)
|
||
|
|
"""
|
||
|
|
assert len(items) == len(weights)
|
||
|
|
assert len(items) > 0
|
||
|
|
|
||
|
|
# Remove items with zero-weight.
|
||
|
|
items2 = []
|
||
|
|
weights2 = []
|
||
|
|
for item, w in zip(items, weights):
|
||
|
|
if w > 0:
|
||
|
|
items2.append(item)
|
||
|
|
weights2.append(w)
|
||
|
|
|
||
|
|
items = items2
|
||
|
|
weights = weights2
|
||
|
|
|
||
|
|
# Make sure that we have some items left.
|
||
|
|
if not items:
|
||
|
|
raise ValueError("Did't got any items with a positive weight.")
|
||
|
|
|
||
|
|
#
|
||
|
|
already_taken = [0 for i in items]
|
||
|
|
item_count = len(items)
|
||
|
|
max_weight = max(weights)
|
||
|
|
|
||
|
|
i = 0
|
||
|
|
while True:
|
||
|
|
# Each iteration of this loop, we fill up until by (total_weight/max_weight).
|
||
|
|
adding = True
|
||
|
|
while adding:
|
||
|
|
adding = False
|
||
|
|
|
||
|
|
for item_i, item, weight in zip(range(item_count), items, weights):
|
||
|
|
if already_taken[item_i] < i * weight / float(max_weight):
|
||
|
|
yield item
|
||
|
|
already_taken[item_i] += 1
|
||
|
|
adding = True
|
||
|
|
|
||
|
|
i += 1
|
||
|
|
|
||
|
|
|
||
|
|
def to_str(value: Union[Callable[[], str], str]) -> str:
|
||
|
|
"Turn callable or string into string."
|
||
|
|
if callable(value):
|
||
|
|
return to_str(value())
|
||
|
|
else:
|
||
|
|
return str(value)
|
||
|
|
|
||
|
|
|
||
|
|
def to_int(value: Union[Callable[[], int], int]) -> int:
|
||
|
|
"Turn callable or int into int."
|
||
|
|
if callable(value):
|
||
|
|
return to_int(value())
|
||
|
|
else:
|
||
|
|
return int(value)
|
||
|
|
|
||
|
|
|
||
|
|
AnyFloat = Union[Callable[[], float], float]
|
||
|
|
|
||
|
|
|
||
|
|
def to_float(value: AnyFloat) -> float:
|
||
|
|
"Turn callable or float into float."
|
||
|
|
if callable(value):
|
||
|
|
return to_float(value())
|
||
|
|
else:
|
||
|
|
return float(value)
|
||
|
|
|
||
|
|
|
||
|
|
def is_dumb_terminal(term: Optional[str] = None) -> bool:
|
||
|
|
"""
|
||
|
|
True if this terminal type is considered "dumb".
|
||
|
|
|
||
|
|
If so, we should fall back to the simplest possible form of line editing,
|
||
|
|
without cursor positioning and color support.
|
||
|
|
"""
|
||
|
|
if term is None:
|
||
|
|
return is_dumb_terminal(os.environ.get("TERM", ""))
|
||
|
|
|
||
|
|
return term.lower() in ["dumb", "unknown"]
|