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1746 lines
64 KiB
1746 lines
64 KiB
"""
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Data structures for the Buffer.
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It holds the text, cursor position, history, etc...
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|
"""
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from __future__ import unicode_literals
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from .application.current import get_app
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from .application.run_in_terminal import run_in_terminal
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from .auto_suggest import AutoSuggest
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from .cache import FastDictCache
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from .clipboard import ClipboardData
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from .completion import CompleteEvent, get_common_complete_suffix, Completer, Completion, DummyCompleter
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from .document import Document
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from .eventloop import ensure_future, Return, From, consume_async_generator
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from .filters import to_filter
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from .history import History, InMemoryHistory
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from .search import SearchDirection, SearchState
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from .selection import SelectionType, SelectionState, PasteMode
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from .utils import Event, test_callable_args, to_str
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from .validation import ValidationError, Validator
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from functools import wraps
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from six.moves import range
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import os
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import re
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import shlex
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import six
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import subprocess
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import tempfile
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__all__ = [
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'EditReadOnlyBuffer',
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'Buffer',
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'indent',
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'unindent',
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'reshape_text',
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]
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class EditReadOnlyBuffer(Exception):
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" Attempt editing of read-only :class:`.Buffer`. "
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|
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class ValidationState(object):
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" The validation state of a buffer. This is set after the validation. "
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VALID = 'VALID'
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INVALID = 'INVALID'
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UNKNOWN = 'UNKNOWN'
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class CompletionState(object):
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"""
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Immutable class that contains a completion state.
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"""
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def __init__(self, original_document, completions=None, complete_index=None):
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#: Document as it was when the completion started.
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self.original_document = original_document
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#: List of all the current Completion instances which are possible at
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#: this point.
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self.completions = completions or []
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#: Position in the `completions` array.
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#: This can be `None` to indicate "no completion", the original text.
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self.complete_index = complete_index # Position in the `_completions` array.
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def __repr__(self):
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return '%s(%r, <%r> completions, index=%r)' % (
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self.__class__.__name__,
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self.original_document, len(self.completions), self.complete_index)
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def go_to_index(self, index):
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"""
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Create a new :class:`.CompletionState` object with the new index.
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When `index` is `None` deselect the completion.
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"""
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if self.completions:
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assert index is None or 0 <= index < len(self.completions)
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self.complete_index = index
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def new_text_and_position(self):
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"""
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Return (new_text, new_cursor_position) for this completion.
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"""
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if self.complete_index is None:
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return self.original_document.text, self.original_document.cursor_position
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else:
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original_text_before_cursor = self.original_document.text_before_cursor
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original_text_after_cursor = self.original_document.text_after_cursor
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c = self.completions[self.complete_index]
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if c.start_position == 0:
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before = original_text_before_cursor
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else:
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before = original_text_before_cursor[:c.start_position]
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new_text = before + c.text + original_text_after_cursor
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new_cursor_position = len(before) + len(c.text)
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return new_text, new_cursor_position
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@property
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def current_completion(self):
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"""
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Return the current completion, or return `None` when no completion is
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selected.
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"""
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if self.complete_index is not None:
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return self.completions[self.complete_index]
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|
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_QUOTED_WORDS_RE = re.compile(r"""(\s+|".*?"|'.*?')""")
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class YankNthArgState(object):
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"""
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For yank-last-arg/yank-nth-arg: Keep track of where we are in the history.
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"""
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def __init__(self, history_position=0, n=-1, previous_inserted_word=''):
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self.history_position = history_position
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self.previous_inserted_word = previous_inserted_word
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self.n = n
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def __repr__(self):
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return '%s(history_position=%r, n=%r, previous_inserted_word=%r)' % (
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self.__class__.__name__, self.history_position, self.n,
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self.previous_inserted_word)
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|
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class Buffer(object):
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"""
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The core data structure that holds the text and cursor position of the
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current input line and implements all text manipulations on top of it. It
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also implements the history, undo stack and the completion state.
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:param completer: :class:`~prompt_toolkit.completion.Completer` instance.
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:param history: :class:`~prompt_toolkit.history.History` instance.
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:param tempfile_suffix: The tempfile suffix (extension) to be used for the
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"open in editor" function. For a Python REPL, this would be ".py", so
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that the editor knows the syntax highlighting to use. This can also be
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a callable that returns a string.
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:param name: Name for this buffer. E.g. DEFAULT_BUFFER. This is mostly
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useful for key bindings where we sometimes prefer to refer to a buffer
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by their name instead of by reference.
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:param accept_handler: Called when the buffer input is accepted. (Usually
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when the user presses `enter`.) The accept handler receives this
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`Buffer` as input and should return True when the buffer text should be
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kept instead of calling reset.
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In case of a `PromptSession` for instance, we want to keep the text,
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because we will exit the application, and only reset it during the next
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run.
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Events:
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:param on_text_changed: When the buffer text changes. (Callable on None.)
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:param on_text_insert: When new text is inserted. (Callable on None.)
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:param on_cursor_position_changed: When the cursor moves. (Callable on None.)
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:param on_completions_changed: When the completions were changed. (Callable on None.)
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:param on_suggestion_set: When an auto-suggestion text has been set. (Callable on None.)
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Filters:
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:param complete_while_typing: :class:`~prompt_toolkit.filters.Filter`
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or `bool`. Decide whether or not to do asynchronous autocompleting while
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typing.
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:param validate_while_typing: :class:`~prompt_toolkit.filters.Filter`
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or `bool`. Decide whether or not to do asynchronous validation while
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typing.
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:param enable_history_search: :class:`~prompt_toolkit.filters.Filter` or
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`bool` to indicate when up-arrow partial string matching is enabled. It
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is advised to not enable this at the same time as
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`complete_while_typing`, because when there is an autocompletion found,
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the up arrows usually browse through the completions, rather than
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through the history.
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:param read_only: :class:`~prompt_toolkit.filters.Filter`. When True,
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changes will not be allowed.
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:param multiline: :class:`~prompt_toolkit.filters.Filter` or `bool`. When
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not set, pressing `Enter` will call the `accept_handler`. Otherwise,
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pressing `Esc-Enter` is required.
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"""
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def __init__(self, completer=None, auto_suggest=None, history=None,
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validator=None, tempfile_suffix='', name='',
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complete_while_typing=False, validate_while_typing=False,
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enable_history_search=False, document=None,
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accept_handler=None, read_only=False, multiline=True,
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on_text_changed=None, on_text_insert=None,
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on_cursor_position_changed=None, on_completions_changed=None,
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on_suggestion_set=None):
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# Accept both filters and booleans as input.
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enable_history_search = to_filter(enable_history_search)
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complete_while_typing = to_filter(complete_while_typing)
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validate_while_typing = to_filter(validate_while_typing)
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read_only = to_filter(read_only)
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multiline = to_filter(multiline)
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# Validate input.
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assert completer is None or isinstance(completer, Completer)
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assert auto_suggest is None or isinstance(auto_suggest, AutoSuggest)
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assert history is None or isinstance(history, History)
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assert validator is None or isinstance(validator, Validator)
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assert callable(tempfile_suffix) or isinstance(tempfile_suffix, six.text_type)
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assert isinstance(name, six.text_type)
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assert on_text_changed is None or callable(on_text_changed)
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assert on_text_insert is None or callable(on_text_insert)
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assert on_cursor_position_changed is None or callable(on_cursor_position_changed)
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assert on_completions_changed is None or callable(on_completions_changed)
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assert on_suggestion_set is None or callable(on_suggestion_set)
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assert document is None or isinstance(document, Document)
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assert accept_handler is None or (callable(accept_handler) and test_callable_args(accept_handler, [None]))
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self.completer = completer or DummyCompleter()
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self.auto_suggest = auto_suggest
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self.validator = validator
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self.tempfile_suffix = tempfile_suffix
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self.name = name
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self.accept_handler = accept_handler
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# Filters. (Usually, used by the key bindings to drive the buffer.)
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self.complete_while_typing = complete_while_typing
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self.validate_while_typing = validate_while_typing
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self.enable_history_search = enable_history_search
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self.read_only = read_only
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self.multiline = multiline
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# Text width. (For wrapping, used by the Vi 'gq' operator.)
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self.text_width = 0
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#: The command buffer history.
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# Note that we shouldn't use a lazy 'or' here. bool(history) could be
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# False when empty.
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self.history = InMemoryHistory() if history is None else history
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self.__cursor_position = 0
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# Events
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self.on_text_changed = Event(self, on_text_changed)
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self.on_text_insert = Event(self, on_text_insert)
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self.on_cursor_position_changed = Event(self, on_cursor_position_changed)
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self.on_completions_changed = Event(self, on_completions_changed)
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self.on_suggestion_set = Event(self, on_suggestion_set)
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# Document cache. (Avoid creating new Document instances.)
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self._document_cache = FastDictCache(Document, size=10)
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# Create completer / auto suggestion / validation coroutines.
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|
self._async_suggester = self._create_auto_suggest_coroutine()
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self._async_completer = self._create_completer_coroutine()
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self._async_validator = self._create_auto_validate_coroutine()
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# Reset other attributes.
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self.reset(document=document)
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# Attach callback for new history entries.
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def new_history_item(sender):
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# Insert the new string into `_working_lines`.
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self._working_lines.insert(0, self.history.get_strings()[0])
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self.__working_index += 1
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self.history.get_item_loaded_event().add_handler(new_history_item)
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self.history.start_loading()
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def __repr__(self):
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if len(self.text) < 15:
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text = self.text
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else:
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text = self.text[:12] + '...'
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return '<Buffer(name=%r, text=%r) at %r>' % (self.name, text, id(self))
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def reset(self, document=None, append_to_history=False):
|
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"""
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:param append_to_history: Append current input to history first.
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"""
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assert document is None or isinstance(document, Document)
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if append_to_history:
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self.append_to_history()
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document = document or Document()
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self.__cursor_position = document.cursor_position
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# `ValidationError` instance. (Will be set when the input is wrong.)
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self.validation_error = None
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self.validation_state = ValidationState.UNKNOWN
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# State of the selection.
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self.selection_state = None
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|
# Multiple cursor mode. (When we press 'I' or 'A' in visual-block mode,
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|
# we can insert text on multiple lines at once. This is implemented by
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|
# using multiple cursors.)
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|
self.multiple_cursor_positions = []
|
|
|
|
# When doing consecutive up/down movements, prefer to stay at this column.
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|
self.preferred_column = None
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|
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|
# State of complete browser
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|
self.complete_state = None # For interactive completion through Ctrl-N/Ctrl-P.
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|
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|
# State of Emacs yank-nth-arg completion.
|
|
self.yank_nth_arg_state = None # for yank-nth-arg.
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|
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# Remember the document that we had *right before* the last paste
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# operation. This is used for rotating through the kill ring.
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|
self.document_before_paste = None
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|
# Current suggestion.
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|
self.suggestion = None
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|
# The history search text. (Used for filtering the history when we
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# browse through it.)
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|
self.history_search_text = None
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|
|
|
# Undo/redo stacks
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|
self._undo_stack = [] # Stack of (text, cursor_position)
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|
self._redo_stack = []
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|
|
#: The working lines. Similar to history, except that this can be
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|
#: modified. The user can press arrow_up and edit previous entries.
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|
#: Ctrl-C should reset this, and copy the whole history back in here.
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|
#: Enter should process the current command and append to the real
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#: history.
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|
self._working_lines = self.history.get_strings()[:]
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|
self._working_lines.append(document.text)
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|
self.__working_index = len(self._working_lines) - 1
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|
|
# <getters/setters>
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|
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|
def _set_text(self, value):
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|
""" set text at current working_index. Return whether it changed. """
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|
working_index = self.working_index
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|
working_lines = self._working_lines
|
|
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|
original_value = working_lines[working_index]
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working_lines[working_index] = value
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|
|
# Return True when this text has been changed.
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|
if len(value) != len(original_value):
|
|
# For Python 2, it seems that when two strings have a different
|
|
# length and one is a prefix of the other, Python still scans
|
|
# character by character to see whether the strings are different.
|
|
# (Some benchmarking showed significant differences for big
|
|
# documents. >100,000 of lines.)
|
|
return True
|
|
elif value != original_value:
|
|
return True
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|
return False
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|
|
|
def _set_cursor_position(self, value):
|
|
""" Set cursor position. Return whether it changed. """
|
|
original_position = self.__cursor_position
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|
self.__cursor_position = max(0, value)
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return value != original_position
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|
@property
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|
def text(self):
|
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return self._working_lines[self.working_index]
|
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|
|
@text.setter
|
|
def text(self, value):
|
|
"""
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|
Setting text. (When doing this, make sure that the cursor_position is
|
|
valid for this text. text/cursor_position should be consistent at any time,
|
|
otherwise set a Document instead.)
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|
"""
|
|
assert isinstance(value, six.text_type), 'Got %r' % value
|
|
|
|
# Ensure cursor position remains within the size of the text.
|
|
if self.cursor_position > len(value):
|
|
self.cursor_position = len(value)
|
|
|
|
# Don't allow editing of read-only buffers.
|
|
if self.read_only():
|
|
raise EditReadOnlyBuffer()
|
|
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|
changed = self._set_text(value)
|
|
|
|
if changed:
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self._text_changed()
|
|
|
|
# Reset history search text.
|
|
# (Note that this doesn't need to happen when working_index
|
|
# changes, which is when we traverse the history. That's why we
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|
# don't do this in `self._text_changed`.)
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|
self.history_search_text = None
|
|
|
|
@property
|
|
def cursor_position(self):
|
|
return self.__cursor_position
|
|
|
|
@cursor_position.setter
|
|
def cursor_position(self, value):
|
|
"""
|
|
Setting cursor position.
|
|
"""
|
|
assert isinstance(value, int)
|
|
|
|
# Ensure cursor position is within the size of the text.
|
|
if value > len(self.text):
|
|
value = len(self.text)
|
|
if value < 0:
|
|
value = 0
|
|
|
|
changed = self._set_cursor_position(value)
|
|
|
|
if changed:
|
|
self._cursor_position_changed()
|
|
|
|
@property
|
|
def working_index(self):
|
|
return self.__working_index
|
|
|
|
@working_index.setter
|
|
def working_index(self, value):
|
|
if self.__working_index != value:
|
|
self.__working_index = value
|
|
# Make sure to reset the cursor position, otherwise we end up in
|
|
# situations where the cursor position is out of the bounds of the
|
|
# text.
|
|
self.cursor_position = 0
|
|
self._text_changed()
|
|
|
|
def _text_changed(self):
|
|
# Remove any validation errors and complete state.
|
|
self.validation_error = None
|
|
self.validation_state = ValidationState.UNKNOWN
|
|
self.complete_state = None
|
|
self.yank_nth_arg_state = None
|
|
self.document_before_paste = None
|
|
self.selection_state = None
|
|
self.suggestion = None
|
|
self.preferred_column = None
|
|
|
|
# fire 'on_text_changed' event.
|
|
self.on_text_changed.fire()
|
|
|
|
# Input validation.
|
|
# (This happens on all change events, unlike auto completion, also when
|
|
# deleting text.)
|
|
if self.validator and self.validate_while_typing():
|
|
ensure_future(self._async_validator())
|
|
|
|
def _cursor_position_changed(self):
|
|
# Remove any complete state.
|
|
# (Input validation should only be undone when the cursor position
|
|
# changes.)
|
|
self.complete_state = None
|
|
self.yank_nth_arg_state = None
|
|
self.document_before_paste = None
|
|
|
|
# Unset preferred_column. (Will be set after the cursor movement, if
|
|
# required.)
|
|
self.preferred_column = None
|
|
|
|
# Note that the cursor position can change if we have a selection the
|
|
# new position of the cursor determines the end of the selection.
|
|
|
|
# fire 'on_cursor_position_changed' event.
|
|
self.on_cursor_position_changed.fire()
|
|
|
|
@property
|
|
def document(self):
|
|
"""
|
|
Return :class:`~prompt_toolkit.document.Document` instance from the
|
|
current text, cursor position and selection state.
|
|
"""
|
|
return self._document_cache[
|
|
self.text, self.cursor_position, self.selection_state]
|
|
|
|
@document.setter
|
|
def document(self, value):
|
|
"""
|
|
Set :class:`~prompt_toolkit.document.Document` instance.
|
|
|
|
This will set both the text and cursor position at the same time, but
|
|
atomically. (Change events will be triggered only after both have been set.)
|
|
"""
|
|
self.set_document(value)
|
|
|
|
def set_document(self, value, bypass_readonly=False):
|
|
"""
|
|
Set :class:`~prompt_toolkit.document.Document` instance. Like the
|
|
``document`` property, but accept an ``bypass_readonly`` argument.
|
|
|
|
:param bypass_readonly: When True, don't raise an
|
|
:class:`.EditReadOnlyBuffer` exception, even
|
|
when the buffer is read-only.
|
|
|
|
.. warning::
|
|
|
|
When this buffer is read-only and `bypass_readonly` was not passed,
|
|
the `EditReadOnlyBuffer` exception will be caught by the
|
|
`KeyProcessor` and is silently suppressed. This is important to
|
|
keep in mind when writing key bindings, because it won't do what
|
|
you expect, and there won't be a stack trace. Use try/finally
|
|
around this function if you need some cleanup code.
|
|
"""
|
|
assert isinstance(value, Document)
|
|
|
|
# Don't allow editing of read-only buffers.
|
|
if not bypass_readonly and self.read_only():
|
|
raise EditReadOnlyBuffer()
|
|
|
|
# Set text and cursor position first.
|
|
text_changed = self._set_text(value.text)
|
|
cursor_position_changed = self._set_cursor_position(value.cursor_position)
|
|
|
|
# Now handle change events. (We do this when text/cursor position is
|
|
# both set and consistent.)
|
|
if text_changed:
|
|
self._text_changed()
|
|
self.history_search_text = None
|
|
|
|
if cursor_position_changed:
|
|
self._cursor_position_changed()
|
|
|
|
@property
|
|
def is_returnable(self):
|
|
"""
|
|
True when there is something handling accept.
|
|
"""
|
|
return bool(self.accept_handler)
|
|
|
|
# End of <getters/setters>
|
|
|
|
def save_to_undo_stack(self, clear_redo_stack=True):
|
|
"""
|
|
Safe current state (input text and cursor position), so that we can
|
|
restore it by calling undo.
|
|
"""
|
|
# Safe if the text is different from the text at the top of the stack
|
|
# is different. If the text is the same, just update the cursor position.
|
|
if self._undo_stack and self._undo_stack[-1][0] == self.text:
|
|
self._undo_stack[-1] = (self._undo_stack[-1][0], self.cursor_position)
|
|
else:
|
|
self._undo_stack.append((self.text, self.cursor_position))
|
|
|
|
# Saving anything to the undo stack, clears the redo stack.
|
|
if clear_redo_stack:
|
|
self._redo_stack = []
|
|
|
|
def transform_lines(self, line_index_iterator, transform_callback):
|
|
"""
|
|
Transforms the text on a range of lines.
|
|
When the iterator yield an index not in the range of lines that the
|
|
document contains, it skips them silently.
|
|
|
|
To uppercase some lines::
|
|
|
|
new_text = transform_lines(range(5,10), lambda text: text.upper())
|
|
|
|
:param line_index_iterator: Iterator of line numbers (int)
|
|
:param transform_callback: callable that takes the original text of a
|
|
line, and return the new text for this line.
|
|
|
|
:returns: The new text.
|
|
"""
|
|
# Split lines
|
|
lines = self.text.split('\n')
|
|
|
|
# Apply transformation
|
|
for index in line_index_iterator:
|
|
try:
|
|
lines[index] = transform_callback(lines[index])
|
|
except IndexError:
|
|
pass
|
|
|
|
return '\n'.join(lines)
|
|
|
|
def transform_current_line(self, transform_callback):
|
|
"""
|
|
Apply the given transformation function to the current line.
|
|
|
|
:param transform_callback: callable that takes a string and return a new string.
|
|
"""
|
|
document = self.document
|
|
a = document.cursor_position + document.get_start_of_line_position()
|
|
b = document.cursor_position + document.get_end_of_line_position()
|
|
self.text = (
|
|
document.text[:a] +
|
|
transform_callback(document.text[a:b]) +
|
|
document.text[b:])
|
|
|
|
def transform_region(self, from_, to, transform_callback):
|
|
"""
|
|
Transform a part of the input string.
|
|
|
|
:param from_: (int) start position.
|
|
:param to: (int) end position.
|
|
:param transform_callback: Callable which accepts a string and returns
|
|
the transformed string.
|
|
"""
|
|
assert from_ < to
|
|
|
|
self.text = ''.join([
|
|
self.text[:from_] +
|
|
transform_callback(self.text[from_:to]) +
|
|
self.text[to:]
|
|
])
|
|
|
|
def cursor_left(self, count=1):
|
|
self.cursor_position += self.document.get_cursor_left_position(count=count)
|
|
|
|
def cursor_right(self, count=1):
|
|
self.cursor_position += self.document.get_cursor_right_position(count=count)
|
|
|
|
def cursor_up(self, count=1):
|
|
""" (for multiline edit). Move cursor to the previous line. """
|
|
original_column = self.preferred_column or self.document.cursor_position_col
|
|
self.cursor_position += self.document.get_cursor_up_position(
|
|
count=count, preferred_column=original_column)
|
|
|
|
# Remember the original column for the next up/down movement.
|
|
self.preferred_column = original_column
|
|
|
|
def cursor_down(self, count=1):
|
|
""" (for multiline edit). Move cursor to the next line. """
|
|
original_column = self.preferred_column or self.document.cursor_position_col
|
|
self.cursor_position += self.document.get_cursor_down_position(
|
|
count=count, preferred_column=original_column)
|
|
|
|
# Remember the original column for the next up/down movement.
|
|
self.preferred_column = original_column
|
|
|
|
def auto_up(self, count=1, go_to_start_of_line_if_history_changes=False):
|
|
"""
|
|
If we're not on the first line (of a multiline input) go a line up,
|
|
otherwise go back in history. (If nothing is selected.)
|
|
"""
|
|
if self.complete_state:
|
|
self.complete_previous(count=count)
|
|
elif self.document.cursor_position_row > 0:
|
|
self.cursor_up(count=count)
|
|
elif not self.selection_state:
|
|
self.history_backward(count=count)
|
|
|
|
# Go to the start of the line?
|
|
if go_to_start_of_line_if_history_changes:
|
|
self.cursor_position += self.document.get_start_of_line_position()
|
|
|
|
def auto_down(self, count=1, go_to_start_of_line_if_history_changes=False):
|
|
"""
|
|
If we're not on the last line (of a multiline input) go a line down,
|
|
otherwise go forward in history. (If nothing is selected.)
|
|
"""
|
|
if self.complete_state:
|
|
self.complete_next(count=count)
|
|
elif self.document.cursor_position_row < self.document.line_count - 1:
|
|
self.cursor_down(count=count)
|
|
elif not self.selection_state:
|
|
self.history_forward(count=count)
|
|
|
|
# Go to the start of the line?
|
|
if go_to_start_of_line_if_history_changes:
|
|
self.cursor_position += self.document.get_start_of_line_position()
|
|
|
|
def delete_before_cursor(self, count=1):
|
|
"""
|
|
Delete specified number of characters before cursor and return the
|
|
deleted text.
|
|
"""
|
|
assert count >= 0
|
|
deleted = ''
|
|
|
|
if self.cursor_position > 0:
|
|
deleted = self.text[self.cursor_position - count:self.cursor_position]
|
|
|
|
new_text = self.text[:self.cursor_position - count] + self.text[self.cursor_position:]
|
|
new_cursor_position = self.cursor_position - len(deleted)
|
|
|
|
# Set new Document atomically.
|
|
self.document = Document(new_text, new_cursor_position)
|
|
|
|
return deleted
|
|
|
|
def delete(self, count=1):
|
|
"""
|
|
Delete specified number of characters and Return the deleted text.
|
|
"""
|
|
if self.cursor_position < len(self.text):
|
|
deleted = self.document.text_after_cursor[:count]
|
|
self.text = self.text[:self.cursor_position] + \
|
|
self.text[self.cursor_position + len(deleted):]
|
|
return deleted
|
|
else:
|
|
return ''
|
|
|
|
def join_next_line(self, separator=' '):
|
|
"""
|
|
Join the next line to the current one by deleting the line ending after
|
|
the current line.
|
|
"""
|
|
if not self.document.on_last_line:
|
|
self.cursor_position += self.document.get_end_of_line_position()
|
|
self.delete()
|
|
|
|
# Remove spaces.
|
|
self.text = (self.document.text_before_cursor + separator +
|
|
self.document.text_after_cursor.lstrip(' '))
|
|
|
|
def join_selected_lines(self, separator=' '):
|
|
"""
|
|
Join the selected lines.
|
|
"""
|
|
assert self.selection_state
|
|
|
|
# Get lines.
|
|
from_, to = sorted([self.cursor_position, self.selection_state.original_cursor_position])
|
|
|
|
before = self.text[:from_]
|
|
lines = self.text[from_:to].splitlines()
|
|
after = self.text[to:]
|
|
|
|
# Replace leading spaces with just one space.
|
|
lines = [l.lstrip(' ') + separator for l in lines]
|
|
|
|
# Set new document.
|
|
self.document = Document(text=before + ''.join(lines) + after,
|
|
cursor_position=len(before + ''.join(lines[:-1])) - 1)
|
|
|
|
def swap_characters_before_cursor(self):
|
|
"""
|
|
Swap the last two characters before the cursor.
|
|
"""
|
|
pos = self.cursor_position
|
|
|
|
if pos >= 2:
|
|
a = self.text[pos - 2]
|
|
b = self.text[pos - 1]
|
|
|
|
self.text = self.text[:pos - 2] + b + a + self.text[pos:]
|
|
|
|
def go_to_history(self, index):
|
|
"""
|
|
Go to this item in the history.
|
|
"""
|
|
if index < len(self._working_lines):
|
|
self.working_index = index
|
|
self.cursor_position = len(self.text)
|
|
|
|
def complete_next(self, count=1, disable_wrap_around=False):
|
|
"""
|
|
Browse to the next completions.
|
|
(Does nothing if there are no completion.)
|
|
"""
|
|
if self.complete_state:
|
|
completions_count = len(self.complete_state.completions)
|
|
|
|
if self.complete_state.complete_index is None:
|
|
index = 0
|
|
elif self.complete_state.complete_index == completions_count - 1:
|
|
index = None
|
|
|
|
if disable_wrap_around:
|
|
return
|
|
else:
|
|
index = min(completions_count - 1, self.complete_state.complete_index + count)
|
|
self.go_to_completion(index)
|
|
|
|
def complete_previous(self, count=1, disable_wrap_around=False):
|
|
"""
|
|
Browse to the previous completions.
|
|
(Does nothing if there are no completion.)
|
|
"""
|
|
if self.complete_state:
|
|
if self.complete_state.complete_index == 0:
|
|
index = None
|
|
|
|
if disable_wrap_around:
|
|
return
|
|
elif self.complete_state.complete_index is None:
|
|
index = len(self.complete_state.completions) - 1
|
|
else:
|
|
index = max(0, self.complete_state.complete_index - count)
|
|
|
|
self.go_to_completion(index)
|
|
|
|
def cancel_completion(self):
|
|
"""
|
|
Cancel completion, go back to the original text.
|
|
"""
|
|
if self.complete_state:
|
|
self.go_to_completion(None)
|
|
self.complete_state = None
|
|
|
|
def _set_completions(self, completions):
|
|
"""
|
|
Start completions. (Generate list of completions and initialize.)
|
|
|
|
By default, no completion will be selected.
|
|
"""
|
|
assert isinstance(completions, list)
|
|
|
|
self.complete_state = CompletionState(
|
|
original_document=self.document,
|
|
completions=completions)
|
|
|
|
# Trigger event. This should eventually invalidate the layout.
|
|
self.on_completions_changed.fire()
|
|
|
|
return self.complete_state
|
|
|
|
def start_history_lines_completion(self):
|
|
"""
|
|
Start a completion based on all the other lines in the document and the
|
|
history.
|
|
"""
|
|
found_completions = set()
|
|
completions = []
|
|
|
|
# For every line of the whole history, find matches with the current line.
|
|
current_line = self.document.current_line_before_cursor.lstrip()
|
|
|
|
for i, string in enumerate(self._working_lines):
|
|
for j, l in enumerate(string.split('\n')):
|
|
l = l.strip()
|
|
if l and l.startswith(current_line):
|
|
# When a new line has been found.
|
|
if l not in found_completions:
|
|
found_completions.add(l)
|
|
|
|
# Create completion.
|
|
if i == self.working_index:
|
|
display_meta = "Current, line %s" % (j + 1)
|
|
else:
|
|
display_meta = "History %s, line %s" % (i + 1, j + 1)
|
|
|
|
completions.append(Completion(
|
|
l,
|
|
start_position=-len(current_line),
|
|
display_meta=display_meta))
|
|
|
|
self._set_completions(completions=completions[::-1])
|
|
self.go_to_completion(0)
|
|
|
|
def go_to_completion(self, index):
|
|
"""
|
|
Select a completion from the list of current completions.
|
|
"""
|
|
assert index is None or isinstance(index, int)
|
|
assert self.complete_state
|
|
|
|
# Set new completion
|
|
state = self.complete_state
|
|
state.go_to_index(index)
|
|
|
|
# Set text/cursor position
|
|
new_text, new_cursor_position = state.new_text_and_position()
|
|
self.document = Document(new_text, new_cursor_position)
|
|
|
|
# (changing text/cursor position will unset complete_state.)
|
|
self.complete_state = state
|
|
|
|
def apply_completion(self, completion):
|
|
"""
|
|
Insert a given completion.
|
|
"""
|
|
assert isinstance(completion, Completion)
|
|
|
|
# If there was already a completion active, cancel that one.
|
|
if self.complete_state:
|
|
self.go_to_completion(None)
|
|
self.complete_state = None
|
|
|
|
# Insert text from the given completion.
|
|
self.delete_before_cursor(-completion.start_position)
|
|
self.insert_text(completion.text)
|
|
|
|
def _set_history_search(self):
|
|
"""
|
|
Set `history_search_text`.
|
|
(The text before the cursor will be used for filtering the history.)
|
|
"""
|
|
if self.enable_history_search():
|
|
if self.history_search_text is None:
|
|
self.history_search_text = self.document.text_before_cursor
|
|
else:
|
|
self.history_search_text = None
|
|
|
|
def _history_matches(self, i):
|
|
"""
|
|
True when the current entry matches the history search.
|
|
(when we don't have history search, it's also True.)
|
|
"""
|
|
return (self.history_search_text is None or
|
|
self._working_lines[i].startswith(self.history_search_text))
|
|
|
|
def history_forward(self, count=1):
|
|
"""
|
|
Move forwards through the history.
|
|
|
|
:param count: Amount of items to move forward.
|
|
"""
|
|
self._set_history_search()
|
|
|
|
# Go forward in history.
|
|
found_something = False
|
|
|
|
for i in range(self.working_index + 1, len(self._working_lines)):
|
|
if self._history_matches(i):
|
|
self.working_index = i
|
|
count -= 1
|
|
found_something = True
|
|
if count == 0:
|
|
break
|
|
|
|
# If we found an entry, move cursor to the end of the first line.
|
|
if found_something:
|
|
self.cursor_position = 0
|
|
self.cursor_position += self.document.get_end_of_line_position()
|
|
|
|
def history_backward(self, count=1):
|
|
"""
|
|
Move backwards through history.
|
|
"""
|
|
self._set_history_search()
|
|
|
|
# Go back in history.
|
|
found_something = False
|
|
|
|
for i in range(self.working_index - 1, -1, -1):
|
|
if self._history_matches(i):
|
|
self.working_index = i
|
|
count -= 1
|
|
found_something = True
|
|
if count == 0:
|
|
break
|
|
|
|
# If we move to another entry, move cursor to the end of the line.
|
|
if found_something:
|
|
self.cursor_position = len(self.text)
|
|
|
|
def yank_nth_arg(self, n=None, _yank_last_arg=False):
|
|
"""
|
|
Pick nth word from previous history entry (depending on current
|
|
`yank_nth_arg_state`) and insert it at current position. Rotate through
|
|
history if called repeatedly. If no `n` has been given, take the first
|
|
argument. (The second word.)
|
|
|
|
:param n: (None or int), The index of the word from the previous line
|
|
to take.
|
|
"""
|
|
assert n is None or isinstance(n, int)
|
|
history_strings = self.history.get_strings()
|
|
|
|
if not len(history_strings):
|
|
return
|
|
|
|
# Make sure we have a `YankNthArgState`.
|
|
if self.yank_nth_arg_state is None:
|
|
state = YankNthArgState(n=-1 if _yank_last_arg else 1)
|
|
else:
|
|
state = self.yank_nth_arg_state
|
|
|
|
if n is not None:
|
|
state.n = n
|
|
|
|
# Get new history position.
|
|
new_pos = state.history_position - 1
|
|
if -new_pos > len(history_strings):
|
|
new_pos = -1
|
|
|
|
# Take argument from line.
|
|
line = history_strings[new_pos]
|
|
|
|
words = [w.strip() for w in _QUOTED_WORDS_RE.split(line)]
|
|
words = [w for w in words if w]
|
|
try:
|
|
word = words[state.n]
|
|
except IndexError:
|
|
word = ''
|
|
|
|
# Insert new argument.
|
|
if state.previous_inserted_word:
|
|
self.delete_before_cursor(len(state.previous_inserted_word))
|
|
self.insert_text(word)
|
|
|
|
# Save state again for next completion. (Note that the 'insert'
|
|
# operation from above clears `self.yank_nth_arg_state`.)
|
|
state.previous_inserted_word = word
|
|
state.history_position = new_pos
|
|
self.yank_nth_arg_state = state
|
|
|
|
def yank_last_arg(self, n=None):
|
|
"""
|
|
Like `yank_nth_arg`, but if no argument has been given, yank the last
|
|
word by default.
|
|
"""
|
|
self.yank_nth_arg(n=n, _yank_last_arg=True)
|
|
|
|
def start_selection(self, selection_type=SelectionType.CHARACTERS):
|
|
"""
|
|
Take the current cursor position as the start of this selection.
|
|
"""
|
|
self.selection_state = SelectionState(self.cursor_position, selection_type)
|
|
|
|
def copy_selection(self, _cut=False):
|
|
"""
|
|
Copy selected text and return :class:`.ClipboardData` instance.
|
|
|
|
Notice that this doesn't store the copied data on the clipboard yet.
|
|
You can store it like this:
|
|
|
|
.. code:: python
|
|
|
|
data = buffer.copy_selection()
|
|
get_app().clipboard.set_data(data)
|
|
"""
|
|
new_document, clipboard_data = self.document.cut_selection()
|
|
if _cut:
|
|
self.document = new_document
|
|
|
|
self.selection_state = None
|
|
return clipboard_data
|
|
|
|
def cut_selection(self):
|
|
"""
|
|
Delete selected text and return :class:`.ClipboardData` instance.
|
|
"""
|
|
return self.copy_selection(_cut=True)
|
|
|
|
def paste_clipboard_data(self, data, paste_mode=PasteMode.EMACS, count=1):
|
|
"""
|
|
Insert the data from the clipboard.
|
|
"""
|
|
assert isinstance(data, ClipboardData)
|
|
assert paste_mode in (PasteMode.VI_BEFORE, PasteMode.VI_AFTER, PasteMode.EMACS)
|
|
|
|
original_document = self.document
|
|
self.document = self.document.paste_clipboard_data(data, paste_mode=paste_mode, count=count)
|
|
|
|
# Remember original document. This assignment should come at the end,
|
|
# because assigning to 'document' will erase it.
|
|
self.document_before_paste = original_document
|
|
|
|
def newline(self, copy_margin=True):
|
|
"""
|
|
Insert a line ending at the current position.
|
|
"""
|
|
if copy_margin:
|
|
self.insert_text('\n' + self.document.leading_whitespace_in_current_line)
|
|
else:
|
|
self.insert_text('\n')
|
|
|
|
def insert_line_above(self, copy_margin=True):
|
|
"""
|
|
Insert a new line above the current one.
|
|
"""
|
|
if copy_margin:
|
|
insert = self.document.leading_whitespace_in_current_line + '\n'
|
|
else:
|
|
insert = '\n'
|
|
|
|
self.cursor_position += self.document.get_start_of_line_position()
|
|
self.insert_text(insert)
|
|
self.cursor_position -= 1
|
|
|
|
def insert_line_below(self, copy_margin=True):
|
|
"""
|
|
Insert a new line below the current one.
|
|
"""
|
|
if copy_margin:
|
|
insert = '\n' + self.document.leading_whitespace_in_current_line
|
|
else:
|
|
insert = '\n'
|
|
|
|
self.cursor_position += self.document.get_end_of_line_position()
|
|
self.insert_text(insert)
|
|
|
|
def insert_text(self, data, overwrite=False, move_cursor=True, fire_event=True):
|
|
"""
|
|
Insert characters at cursor position.
|
|
|
|
:param fire_event: Fire `on_text_insert` event. This is mainly used to
|
|
trigger autocompletion while typing.
|
|
"""
|
|
# Original text & cursor position.
|
|
otext = self.text
|
|
ocpos = self.cursor_position
|
|
|
|
# In insert/text mode.
|
|
if overwrite:
|
|
# Don't overwrite the newline itself. Just before the line ending,
|
|
# it should act like insert mode.
|
|
overwritten_text = otext[ocpos:ocpos + len(data)]
|
|
if '\n' in overwritten_text:
|
|
overwritten_text = overwritten_text[:overwritten_text.find('\n')]
|
|
|
|
text = otext[:ocpos] + data + otext[ocpos + len(overwritten_text):]
|
|
else:
|
|
text = otext[:ocpos] + data + otext[ocpos:]
|
|
|
|
if move_cursor:
|
|
cpos = self.cursor_position + len(data)
|
|
else:
|
|
cpos = self.cursor_position
|
|
|
|
# Set new document.
|
|
# (Set text and cursor position at the same time. Otherwise, setting
|
|
# the text will fire a change event before the cursor position has been
|
|
# set. It works better to have this atomic.)
|
|
self.document = Document(text, cpos)
|
|
|
|
# Fire 'on_text_insert' event.
|
|
if fire_event: # XXX: rename to `start_complete`.
|
|
self.on_text_insert.fire()
|
|
|
|
# Only complete when "complete_while_typing" is enabled.
|
|
if self.completer and self.complete_while_typing():
|
|
ensure_future(self._async_completer())
|
|
|
|
# Call auto_suggest.
|
|
if self.auto_suggest:
|
|
ensure_future(self._async_suggester())
|
|
|
|
def undo(self):
|
|
# Pop from the undo-stack until we find a text that if different from
|
|
# the current text. (The current logic of `save_to_undo_stack` will
|
|
# cause that the top of the undo stack is usually the same as the
|
|
# current text, so in that case we have to pop twice.)
|
|
while self._undo_stack:
|
|
text, pos = self._undo_stack.pop()
|
|
|
|
if text != self.text:
|
|
# Push current text to redo stack.
|
|
self._redo_stack.append((self.text, self.cursor_position))
|
|
|
|
# Set new text/cursor_position.
|
|
self.document = Document(text, cursor_position=pos)
|
|
break
|
|
|
|
def redo(self):
|
|
if self._redo_stack:
|
|
# Copy current state on undo stack.
|
|
self.save_to_undo_stack(clear_redo_stack=False)
|
|
|
|
# Pop state from redo stack.
|
|
text, pos = self._redo_stack.pop()
|
|
self.document = Document(text, cursor_position=pos)
|
|
|
|
def validate(self, set_cursor=False):
|
|
"""
|
|
Returns `True` if valid.
|
|
|
|
:param set_cursor: Set the cursor position, if an error was found.
|
|
"""
|
|
# Don't call the validator again, if it was already called for the
|
|
# current input.
|
|
if self.validation_state != ValidationState.UNKNOWN:
|
|
return self.validation_state == ValidationState.VALID
|
|
|
|
# Call validator.
|
|
if self.validator:
|
|
try:
|
|
self.validator.validate(self.document)
|
|
except ValidationError as e:
|
|
# Set cursor position (don't allow invalid values.)
|
|
if set_cursor:
|
|
self.cursor_position = min(max(0, e.cursor_position), len(self.text))
|
|
|
|
self.validation_state = ValidationState.INVALID
|
|
self.validation_error = e
|
|
return False
|
|
|
|
# Handle validation result.
|
|
self.validation_state = ValidationState.VALID
|
|
self.validation_error = None
|
|
return True
|
|
|
|
def _validate_async(self):
|
|
"""
|
|
Asynchronous version of `validate()`.
|
|
This one doesn't set the cursor position.
|
|
|
|
We have both variants, because a synchronous version is required.
|
|
Handling the ENTER key needs to be completely synchronous, otherwise
|
|
stuff like type-ahead is going to give very weird results. (People
|
|
could type input while the ENTER key is still processed.)
|
|
|
|
An asynchronous version is required if we have `validate_while_typing`
|
|
enabled.
|
|
"""
|
|
def coroutine():
|
|
# Don't call the validator again, if it was already called for the
|
|
# current input.
|
|
if self.validation_state != ValidationState.UNKNOWN:
|
|
raise Return(self.validation_state == ValidationState.VALID)
|
|
|
|
# Call validator.
|
|
error = None
|
|
document = self.document
|
|
|
|
if self.validator:
|
|
try:
|
|
yield self.validator.get_validate_future(self.document)
|
|
except ValidationError as e:
|
|
error = e
|
|
|
|
# If the document changed during the validation, try again.
|
|
if self.document != document:
|
|
result = yield From(coroutine())
|
|
raise Return(result)
|
|
|
|
# Handle validation result.
|
|
if error:
|
|
self.validation_state = ValidationState.INVALID
|
|
else:
|
|
self.validation_state = ValidationState.VALID
|
|
|
|
self.validation_error = error
|
|
get_app().invalidate() # Trigger redraw (display error).
|
|
|
|
raise Return(error is None)
|
|
|
|
return ensure_future(coroutine())
|
|
|
|
def append_to_history(self):
|
|
"""
|
|
Append the current input to the history.
|
|
"""
|
|
# Save at the tail of the history. (But don't if the last entry the
|
|
# history is already the same.)
|
|
if self.text:
|
|
history_strings = self.history.get_strings()
|
|
if not len(history_strings) or history_strings[-1] != self.text:
|
|
self.history.append_string(self.text)
|
|
|
|
def _search(self, search_state, include_current_position=False, count=1):
|
|
"""
|
|
Execute search. Return (working_index, cursor_position) tuple when this
|
|
search is applied. Returns `None` when this text cannot be found.
|
|
"""
|
|
assert isinstance(search_state, SearchState)
|
|
assert isinstance(count, int) and count > 0
|
|
|
|
text = search_state.text
|
|
direction = search_state.direction
|
|
ignore_case = search_state.ignore_case()
|
|
|
|
def search_once(working_index, document):
|
|
"""
|
|
Do search one time.
|
|
Return (working_index, document) or `None`
|
|
"""
|
|
if direction == SearchDirection.FORWARD:
|
|
# Try find at the current input.
|
|
new_index = document.find(
|
|
text, include_current_position=include_current_position,
|
|
ignore_case=ignore_case)
|
|
|
|
if new_index is not None:
|
|
return (working_index,
|
|
Document(document.text, document.cursor_position + new_index))
|
|
else:
|
|
# No match, go forward in the history. (Include len+1 to wrap around.)
|
|
# (Here we should always include all cursor positions, because
|
|
# it's a different line.)
|
|
for i in range(working_index + 1, len(self._working_lines) + 1):
|
|
i %= len(self._working_lines)
|
|
|
|
document = Document(self._working_lines[i], 0)
|
|
new_index = document.find(text, include_current_position=True,
|
|
ignore_case=ignore_case)
|
|
if new_index is not None:
|
|
return (i, Document(document.text, new_index))
|
|
else:
|
|
# Try find at the current input.
|
|
new_index = document.find_backwards(
|
|
text, ignore_case=ignore_case)
|
|
|
|
if new_index is not None:
|
|
return (working_index,
|
|
Document(document.text, document.cursor_position + new_index))
|
|
else:
|
|
# No match, go back in the history. (Include -1 to wrap around.)
|
|
for i in range(working_index - 1, -2, -1):
|
|
i %= len(self._working_lines)
|
|
|
|
document = Document(self._working_lines[i], len(self._working_lines[i]))
|
|
new_index = document.find_backwards(
|
|
text, ignore_case=ignore_case)
|
|
if new_index is not None:
|
|
return (i, Document(document.text, len(document.text) + new_index))
|
|
|
|
# Do 'count' search iterations.
|
|
working_index = self.working_index
|
|
document = self.document
|
|
for _ in range(count):
|
|
result = search_once(working_index, document)
|
|
if result is None:
|
|
return # Nothing found.
|
|
else:
|
|
working_index, document = result
|
|
|
|
return (working_index, document.cursor_position)
|
|
|
|
def document_for_search(self, search_state):
|
|
"""
|
|
Return a :class:`~prompt_toolkit.document.Document` instance that has
|
|
the text/cursor position for this search, if we would apply it. This
|
|
will be used in the
|
|
:class:`~prompt_toolkit.layout.BufferControl` to display feedback while
|
|
searching.
|
|
"""
|
|
search_result = self._search(search_state, include_current_position=True)
|
|
|
|
if search_result is None:
|
|
return self.document
|
|
else:
|
|
working_index, cursor_position = search_result
|
|
|
|
# Keep selection, when `working_index` was not changed.
|
|
if working_index == self.working_index:
|
|
selection = self.selection_state
|
|
else:
|
|
selection = None
|
|
|
|
return Document(self._working_lines[working_index],
|
|
cursor_position, selection=selection)
|
|
|
|
def get_search_position(self, search_state, include_current_position=True, count=1):
|
|
"""
|
|
Get the cursor position for this search.
|
|
(This operation won't change the `working_index`. It's won't go through
|
|
the history. Vi text objects can't span multiple items.)
|
|
"""
|
|
search_result = self._search(
|
|
search_state, include_current_position=include_current_position, count=count)
|
|
|
|
if search_result is None:
|
|
return self.cursor_position
|
|
else:
|
|
working_index, cursor_position = search_result
|
|
return cursor_position
|
|
|
|
def apply_search(self, search_state, include_current_position=True, count=1):
|
|
"""
|
|
Apply search. If something is found, set `working_index` and
|
|
`cursor_position`.
|
|
"""
|
|
search_result = self._search(
|
|
search_state, include_current_position=include_current_position, count=count)
|
|
|
|
if search_result is not None:
|
|
working_index, cursor_position = search_result
|
|
self.working_index = working_index
|
|
self.cursor_position = cursor_position
|
|
|
|
def exit_selection(self):
|
|
self.selection_state = None
|
|
|
|
def open_in_editor(self, validate_and_handle=False):
|
|
"""
|
|
Open code in editor.
|
|
|
|
This returns a future, and runs in a thread executor.
|
|
"""
|
|
if self.read_only():
|
|
raise EditReadOnlyBuffer()
|
|
|
|
# Write to temporary file
|
|
descriptor, filename = tempfile.mkstemp(to_str(self.tempfile_suffix))
|
|
os.write(descriptor, self.text.encode('utf-8'))
|
|
os.close(descriptor)
|
|
|
|
def run():
|
|
try:
|
|
# Open in editor
|
|
# (We need to use `run_in_terminal`, because not all editors go to
|
|
# the alternate screen buffer, and some could influence the cursor
|
|
# position.)
|
|
succes = yield From(run_in_terminal(
|
|
lambda: self._open_file_in_editor(filename), in_executor=True))
|
|
|
|
# Read content again.
|
|
if succes:
|
|
with open(filename, 'rb') as f:
|
|
text = f.read().decode('utf-8')
|
|
|
|
# Drop trailing newline. (Editors are supposed to add it at the
|
|
# end, but we don't need it.)
|
|
if text.endswith('\n'):
|
|
text = text[:-1]
|
|
|
|
self.document = Document(
|
|
text=text,
|
|
cursor_position=len(text))
|
|
|
|
# Accept the input.
|
|
if validate_and_handle:
|
|
self.validate_and_handle()
|
|
|
|
finally:
|
|
# Clean up temp file.
|
|
os.remove(filename)
|
|
|
|
return ensure_future(run())
|
|
|
|
def _open_file_in_editor(self, filename):
|
|
"""
|
|
Call editor executable.
|
|
|
|
Return True when we received a zero return code.
|
|
"""
|
|
# If the 'VISUAL' or 'EDITOR' environment variable has been set, use that.
|
|
# Otherwise, fall back to the first available editor that we can find.
|
|
visual = os.environ.get('VISUAL')
|
|
editor = os.environ.get('EDITOR')
|
|
|
|
editors = [
|
|
visual,
|
|
editor,
|
|
|
|
# Order of preference.
|
|
'/usr/bin/editor',
|
|
'/usr/bin/nano',
|
|
'/usr/bin/pico',
|
|
'/usr/bin/vi',
|
|
'/usr/bin/emacs',
|
|
]
|
|
|
|
for e in editors:
|
|
if e:
|
|
try:
|
|
# Use 'shlex.split()', because $VISUAL can contain spaces
|
|
# and quotes.
|
|
returncode = subprocess.call(shlex.split(e) + [filename])
|
|
return returncode == 0
|
|
|
|
except OSError:
|
|
# Executable does not exist, try the next one.
|
|
pass
|
|
|
|
return False
|
|
|
|
def start_completion(self, select_first=False, select_last=False,
|
|
insert_common_part=False, complete_event=None):
|
|
"""
|
|
Start asynchronous autocompletion of this buffer.
|
|
(This will do nothing if a previous completion was still in progress.)
|
|
"""
|
|
# Only one of these options can be selected.
|
|
assert select_first + select_last + insert_common_part <= 1
|
|
|
|
ensure_future(self._async_completer(
|
|
select_first=select_first,
|
|
select_last=select_last,
|
|
insert_common_part=insert_common_part,
|
|
complete_event=complete_event or CompleteEvent(completion_requested=True)))
|
|
|
|
def _create_completer_coroutine(self):
|
|
"""
|
|
Create function for asynchronous autocompletion.
|
|
|
|
(This consumes the asynchronous completer generator, which possibly
|
|
runs the completion algorithm in another thread.)
|
|
"""
|
|
def completion_does_nothing(document, completion):
|
|
"""
|
|
Return `True` if applying this completion doesn't have any effect.
|
|
(When it doesn't insert any new text.
|
|
"""
|
|
text_before_cursor = document.text_before_cursor
|
|
replaced_text = text_before_cursor[
|
|
len(text_before_cursor) + completion.start_position:]
|
|
return replaced_text == completion.text
|
|
|
|
@_only_one_at_a_time
|
|
def async_completer(select_first=False, select_last=False,
|
|
insert_common_part=False, complete_event=None):
|
|
document = self.document
|
|
complete_event = complete_event or CompleteEvent(text_inserted=True)
|
|
|
|
# Don't complete when we already have completions.
|
|
if self.complete_state or not self.completer:
|
|
return
|
|
|
|
# Create an empty CompletionState.
|
|
complete_state = CompletionState(original_document=self.document)
|
|
self.complete_state = complete_state
|
|
|
|
def proceed():
|
|
""" Keep retrieving completions. Input text has not yet changed
|
|
while generating completions. """
|
|
return self.complete_state == complete_state
|
|
|
|
def add_completion(completion):
|
|
" Got one completion from the asynchronous completion generator. "
|
|
complete_state.completions.append(completion)
|
|
self.on_completions_changed.fire()
|
|
|
|
yield From(consume_async_generator(
|
|
self.completer.get_completions_async(document, complete_event),
|
|
item_callback=add_completion,
|
|
cancel=lambda: not proceed()))
|
|
|
|
completions = complete_state.completions
|
|
|
|
# When there is only one completion, which has nothing to add, ignore it.
|
|
if (len(completions) == 1 and
|
|
completion_does_nothing(document, completions[0])):
|
|
del completions[:]
|
|
|
|
# Set completions if the text was not yet changed.
|
|
if proceed():
|
|
# When no completions were found, or when the user selected
|
|
# already a completion by using the arrow keys, don't do anything.
|
|
if not self.complete_state or self.complete_state.complete_index is not None:
|
|
return
|
|
|
|
# When there are no completions, reset completion state anyway.
|
|
if not completions:
|
|
self.complete_state = None
|
|
# Render the ui if the completion menu was shown
|
|
# it is needed especially if there is one completion and it was deleted.
|
|
self.on_completions_changed.fire()
|
|
return
|
|
|
|
# Select first/last or insert common part, depending on the key
|
|
# binding. (For this we have to wait until all completions are
|
|
# loaded.)
|
|
|
|
if select_first:
|
|
self.go_to_completion(0)
|
|
|
|
elif select_last:
|
|
self.go_to_completion(len(completions) - 1)
|
|
|
|
elif insert_common_part:
|
|
common_part = get_common_complete_suffix(document, completions)
|
|
if common_part:
|
|
# Insert the common part, update completions.
|
|
self.insert_text(common_part)
|
|
if len(completions) > 1:
|
|
# (Don't call `async_completer` again, but
|
|
# recalculate completions. See:
|
|
# https://github.com/ipython/ipython/issues/9658)
|
|
completions[:] = [
|
|
c.new_completion_from_position(len(common_part))
|
|
for c in completions]
|
|
|
|
self._set_completions(completions=completions)
|
|
else:
|
|
self.complete_state = None
|
|
else:
|
|
# When we were asked to insert the "common"
|
|
# prefix, but there was no common suffix but
|
|
# still exactly one match, then select the
|
|
# first. (It could be that we have a completion
|
|
# which does * expansion, like '*.py', with
|
|
# exactly one match.)
|
|
if len(completions) == 1:
|
|
self.go_to_completion(0)
|
|
|
|
else:
|
|
# If the last operation was an insert, (not a delete), restart
|
|
# the completion coroutine.
|
|
|
|
if self.document.text_before_cursor == document.text_before_cursor:
|
|
return # Nothing changed.
|
|
|
|
if self.document.text_before_cursor.startswith(document.text_before_cursor):
|
|
raise _Retry
|
|
|
|
return async_completer
|
|
|
|
def _create_auto_suggest_coroutine(self):
|
|
"""
|
|
Create function for asynchronous auto suggestion.
|
|
(This can be in another thread.)
|
|
"""
|
|
@_only_one_at_a_time
|
|
def async_suggestor():
|
|
document = self.document
|
|
|
|
# Don't suggest when we already have a suggestion.
|
|
if self.suggestion or not self.auto_suggest:
|
|
return
|
|
|
|
suggestion = yield From(self.auto_suggest.get_suggestion_future(
|
|
self, document))
|
|
|
|
# Set suggestion only if the text was not yet changed.
|
|
if self.document == document:
|
|
# Set suggestion and redraw interface.
|
|
self.suggestion = suggestion
|
|
self.on_suggestion_set.fire()
|
|
else:
|
|
# Otherwise, restart thread.
|
|
raise _Retry
|
|
return async_suggestor
|
|
|
|
def _create_auto_validate_coroutine(self):
|
|
"""
|
|
Create a function for asynchronous validation while typing.
|
|
(This can be in another thread.)
|
|
"""
|
|
@_only_one_at_a_time
|
|
def async_validator():
|
|
yield From(self._validate_async())
|
|
return async_validator
|
|
|
|
def validate_and_handle(self):
|
|
"""
|
|
Validate buffer and handle the accept action.
|
|
"""
|
|
valid = self.validate(set_cursor=True)
|
|
|
|
# When the validation succeeded, accept the input.
|
|
if valid:
|
|
if self.accept_handler:
|
|
keep_text = self.accept_handler(self)
|
|
else:
|
|
keep_text = False
|
|
|
|
self.append_to_history()
|
|
|
|
if not keep_text:
|
|
self.reset()
|
|
|
|
|
|
def _only_one_at_a_time(coroutine):
|
|
"""
|
|
Decorator that only starts the coroutine only if the previous call has
|
|
finished. (Used to make sure that we have only one autocompleter, auto
|
|
suggestor and validator running at a time.)
|
|
|
|
When the coroutine raises `_Retry`, it is restarted.
|
|
"""
|
|
running = [False]
|
|
|
|
@wraps(coroutine)
|
|
def new_coroutine(*a, **kw):
|
|
# Don't start a new function, if the previous is still in progress.
|
|
if running[0]:
|
|
return
|
|
|
|
running[0] = True
|
|
|
|
try:
|
|
while True:
|
|
try:
|
|
yield From(coroutine(*a, **kw))
|
|
except _Retry:
|
|
continue
|
|
else:
|
|
raise Return(None)
|
|
finally:
|
|
running[0] = False
|
|
return new_coroutine
|
|
|
|
|
|
class _Retry(Exception):
|
|
" Retry in `_only_one_at_a_time`. "
|
|
|
|
|
|
def indent(buffer, from_row, to_row, count=1):
|
|
"""
|
|
Indent text of a :class:`.Buffer` object.
|
|
"""
|
|
current_row = buffer.document.cursor_position_row
|
|
line_range = range(from_row, to_row)
|
|
|
|
# Apply transformation.
|
|
new_text = buffer.transform_lines(line_range, lambda l: ' ' * count + l)
|
|
buffer.document = Document(
|
|
new_text,
|
|
Document(new_text).translate_row_col_to_index(current_row, 0))
|
|
|
|
# Go to the start of the line.
|
|
buffer.cursor_position += buffer.document.get_start_of_line_position(after_whitespace=True)
|
|
|
|
|
|
def unindent(buffer, from_row, to_row, count=1):
|
|
"""
|
|
Unindent text of a :class:`.Buffer` object.
|
|
"""
|
|
current_row = buffer.document.cursor_position_row
|
|
line_range = range(from_row, to_row)
|
|
|
|
def transform(text):
|
|
remove = ' ' * count
|
|
if text.startswith(remove):
|
|
return text[len(remove):]
|
|
else:
|
|
return text.lstrip()
|
|
|
|
# Apply transformation.
|
|
new_text = buffer.transform_lines(line_range, transform)
|
|
buffer.document = Document(
|
|
new_text,
|
|
Document(new_text).translate_row_col_to_index(current_row, 0))
|
|
|
|
# Go to the start of the line.
|
|
buffer.cursor_position += buffer.document.get_start_of_line_position(after_whitespace=True)
|
|
|
|
|
|
def reshape_text(buffer, from_row, to_row):
|
|
"""
|
|
Reformat text, taking the width into account.
|
|
`to_row` is included.
|
|
(Vi 'gq' operator.)
|
|
"""
|
|
lines = buffer.text.splitlines(True)
|
|
lines_before = lines[:from_row]
|
|
lines_after = lines[to_row + 1:]
|
|
lines_to_reformat = lines[from_row:to_row + 1]
|
|
|
|
if lines_to_reformat:
|
|
# Take indentation from the first line.
|
|
length = re.search(r'^\s*', lines_to_reformat[0]).end()
|
|
indent = lines_to_reformat[0][:length].replace('\n', '')
|
|
|
|
# Now, take all the 'words' from the lines to be reshaped.
|
|
words = ''.join(lines_to_reformat).split()
|
|
|
|
# And reshape.
|
|
width = (buffer.text_width or 80) - len(indent)
|
|
reshaped_text = [indent]
|
|
current_width = 0
|
|
for w in words:
|
|
if current_width:
|
|
if len(w) + current_width + 1 > width:
|
|
reshaped_text.append('\n')
|
|
reshaped_text.append(indent)
|
|
current_width = 0
|
|
else:
|
|
reshaped_text.append(' ')
|
|
current_width += 1
|
|
|
|
reshaped_text.append(w)
|
|
current_width += len(w)
|
|
|
|
if reshaped_text[-1] != '\n':
|
|
reshaped_text.append('\n')
|
|
|
|
# Apply result.
|
|
buffer.document = Document(
|
|
text=''.join(lines_before + reshaped_text + lines_after),
|
|
cursor_position=len(''.join(lines_before + reshaped_text)))
|