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repl.py
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1255 lines (1073 loc) · 44.7 KB
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# The MIT License
#
# Copyright (c) 2009-2011 the bpython authors.
# Copyright (c) 2012-2013,2015 Sebastian Ramacher
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import code
import inspect
import os
import pkgutil
import pydoc
import shlex
import subprocess
import sys
import tempfile
import textwrap
import time
import traceback
from enum import Enum
from itertools import takewhile
from pathlib import Path
from types import ModuleType
from pygments.token import Token
from pygments.lexers import Python3Lexer
from . import autocomplete, inspection, simpleeval
from .clipboard import get_clipboard, CopyFailed
from .config import getpreferredencoding
from .formatter import Parenthesis
from .history import History
from .lazyre import LazyReCompile
from .paste import PasteHelper, PastePinnwand, PasteFailed
from .patch_linecache import filename_for_console_input
from .translations import _, ngettext
from .importcompletion import ModuleGatherer
class RuntimeTimer:
"""Calculate running time"""
def __init__(self):
self.reset_timer()
self.time = time.monotonic if hasattr(time, "monotonic") else time.time
def __enter__(self):
self.start = self.time()
def __exit__(self, ty, val, tb):
self.last_command = self.time() - self.start
self.running_time += self.last_command
return False
def reset_timer(self):
self.running_time = 0.0
self.last_command = 0.0
def estimate(self):
return self.running_time - self.last_command
class Interpreter(code.InteractiveInterpreter):
"""Source code interpreter for use in bpython."""
bpython_input_re = LazyReCompile(r"<bpython-input-\d+>")
def __init__(self, locals=None, encoding=None):
"""Constructor.
The optional 'locals' argument specifies the dictionary in which code
will be executed; it defaults to a newly created dictionary with key
"__name__" set to "__main__".
The syntaxerror callback can be set at any time and will be called
on a caught syntax error. The purpose for this in bpython is so that
the repl can be instantiated after the interpreter (which it
necessarily must be with the current factoring) and then an exception
callback can be added to the Interpreter instance afterwards - more
specifically, this is so that autoindentation does not occur after a
traceback.
encoding is only used in Python 2, where it may be necessary to add an
encoding comment to a source bytestring before running it.
encoding must be a bytestring in Python 2 because it will be templated
into a bytestring source as part of an encoding comment.
"""
self.encoding = encoding or getpreferredencoding()
self.syntaxerror_callback = None
if locals is None:
# instead of messing with sys.modules, we should modify sys.modules
# in the interpreter instance
sys.modules["__main__"] = main_mod = ModuleType("__main__")
locals = main_mod.__dict__
super().__init__(locals)
self.timer = RuntimeTimer()
def reset_running_time(self):
self.running_time = 0
def runsource(self, source, filename=None, symbol="single", encode="auto"):
"""Execute Python code.
source, filename and symbol are passed on to
code.InteractiveInterpreter.runsource. If encode is True,
an encoding comment will be added to the source.
On Python 3.X, encode will be ignored.
encode should only be used for interactive interpreter input,
files should always already have an encoding comment or be ASCII.
By default an encoding line will be added if no filename is given.
source must be a string
Because adding an encoding comment to a unicode string in Python 2
would cause a syntax error to be thrown which would reference code
the user did not write, setting encoding to True when source is a
unicode string in Python 2 will throw a ValueError."""
if encode and filename is not None:
# files have encoding comments or implicit encoding of ASCII
if encode != "auto":
raise ValueError("shouldn't add encoding line to file contents")
encode = False
if filename is None:
filename = filename_for_console_input(source)
with self.timer:
return code.InteractiveInterpreter.runsource(
self, source, filename, symbol
)
def showsyntaxerror(self, filename=None):
"""Override the regular handler, the code's copied and pasted from
code.py, as per showtraceback, but with the syntaxerror callback called
and the text in a pretty colour."""
if self.syntaxerror_callback is not None:
self.syntaxerror_callback()
exc_type, value, sys.last_traceback = sys.exc_info()
sys.last_type = exc_type
sys.last_value = value
if filename and exc_type is SyntaxError:
# Work hard to stuff the correct filename in the exception
try:
msg, (dummy_filename, lineno, offset, line) = value.args
except:
# Not the format we expect; leave it alone
pass
else:
# Stuff in the right filename and right lineno
# strip linecache line number
if self.bpython_input_re.match(filename):
filename = "<input>"
value = SyntaxError(msg, (filename, lineno, offset, line))
sys.last_value = value
exc_formatted = traceback.format_exception_only(exc_type, value)
self.writetb(exc_formatted)
def showtraceback(self):
"""This needs to override the default traceback thing
so it can put it into a pretty colour and maybe other
stuff, I don't know"""
try:
t, v, tb = sys.exc_info()
sys.last_type = t
sys.last_value = v
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
for i, (fname, lineno, module, something) in enumerate(tblist):
# strip linecache line number
if self.bpython_input_re.match(fname):
fname = "<input>"
tblist[i] = (fname, lineno, module, something)
l = traceback.format_list(tblist)
if l:
l.insert(0, "Traceback (most recent call last):\n")
l[len(l) :] = traceback.format_exception_only(t, v)
finally:
pass
self.writetb(l)
def writetb(self, lines):
"""This outputs the traceback and should be overridden for anything
fancy."""
for line in lines:
self.write(line)
class MatchesIterator:
"""Stores a list of matches and which one is currently selected if any.
Also responsible for doing the actual replacement of the original line with
the selected match.
A MatchesIterator can be `clear`ed to reset match iteration, and
`update`ed to set what matches will be iterated over."""
def __init__(self):
# word being replaced in the original line of text
self.current_word = ""
# possible replacements for current_word
self.matches = None
# which word is currently replacing the current word
self.index = -1
# cursor position in the original line
self.orig_cursor_offset = None
# original line (before match replacements)
self.orig_line = None
# class describing the current type of completion
self.completer = None
def __nonzero__(self):
"""MatchesIterator is False when word hasn't been replaced yet"""
return self.index != -1
def __bool__(self):
return self.index != -1
@property
def candidate_selected(self):
"""True when word selected/replaced, False when word hasn't been
replaced yet"""
return bool(self)
def __iter__(self):
return self
def current(self):
if self.index == -1:
raise ValueError("No current match.")
return self.matches[self.index]
def next(self):
return self.__next__()
def __next__(self):
self.index = (self.index + 1) % len(self.matches)
return self.matches[self.index]
def previous(self):
if self.index <= 0:
self.index = len(self.matches)
self.index -= 1
return self.matches[self.index]
def cur_line(self):
"""Returns a cursor offset and line with the current substitution
made"""
return self.substitute(self.current())
def substitute(self, match):
"""Returns a cursor offset and line with match substituted in"""
start, end, word = self.completer.locate(
self.orig_cursor_offset, self.orig_line
)
return (
start + len(match),
self.orig_line[:start] + match + self.orig_line[end:],
)
def is_cseq(self):
return bool(
os.path.commonprefix(self.matches)[len(self.current_word) :]
)
def substitute_cseq(self):
"""Returns a new line by substituting a common sequence in, and update
matches"""
cseq = os.path.commonprefix(self.matches)
new_cursor_offset, new_line = self.substitute(cseq)
if len(self.matches) == 1:
self.clear()
else:
self.update(
new_cursor_offset, new_line, self.matches, self.completer
)
if len(self.matches) == 1:
self.clear()
return new_cursor_offset, new_line
def update(self, cursor_offset, current_line, matches, completer):
"""Called to reset the match index and update the word being replaced
Should only be called if there's a target to update - otherwise, call
clear"""
if matches is None:
raise ValueError("Matches may not be None.")
self.orig_cursor_offset = cursor_offset
self.orig_line = current_line
self.matches = matches
self.completer = completer
self.index = -1
self.start, self.end, self.current_word = self.completer.locate(
self.orig_cursor_offset, self.orig_line
)
def clear(self):
self.matches = []
self.cursor_offset = -1
self.current_line = ""
self.current_word = ""
self.start = None
self.end = None
self.index = -1
class Interaction:
def __init__(self, config, statusbar=None):
self.config = config
if statusbar:
self.statusbar = statusbar
def confirm(self, s):
raise NotImplementedError
def notify(self, s, n=10, wait_for_keypress=False):
raise NotImplementedError
def file_prompt(self, s):
raise NotImplementedError
class SourceNotFound(Exception):
"""Exception raised when the requested source could not be found."""
class LineTypeTranslator(Enum):
"""Used when adding a tuple to all_logical_lines, to get input / output values
having to actually type/know the strings"""
INPUT = "input"
OUTPUT = "output"
class Repl:
"""Implements the necessary guff for a Python-repl-alike interface
The execution of the code entered and all that stuff was taken from the
Python code module, I had to copy it instead of inheriting it, I can't
remember why. The rest of the stuff is basically what makes it fancy.
It reads what you type, passes it to a lexer and highlighter which
returns a formatted string. This then gets passed to echo() which
parses that string and prints to the curses screen in appropriate
colours and/or bold attribute.
The Repl class also keeps two stacks of lines that the user has typed in:
One to be used for the undo feature. I am not happy with the way this
works. The only way I have been able to think of is to keep the code
that's been typed in in memory and re-evaluate it in its entirety for each
"undo" operation. Obviously this means some operations could be extremely
slow. I'm not even by any means certain that this truly represents a
genuine "undo" implementation, but it does seem to be generally pretty
effective.
If anyone has any suggestions for how this could be improved, I'd be happy
to hear them and implement it/accept a patch. I researched a bit into the
idea of keeping the entire Python state in memory, but this really seems
very difficult (I believe it may actually be impossible to work) and has
its own problems too.
The other stack is for keeping a history for pressing the up/down keys
to go back and forth between lines.
XXX Subclasses should implement echo, current_line, cw
"""
def __init__(self, interp, config):
"""Initialise the repl.
interp is a Python code.InteractiveInterpreter instance
config is a populated bpython.config.Struct.
"""
self.config = config
self.cut_buffer = ""
self.buffer = []
self.interp = interp
self.interp.syntaxerror_callback = self.clear_current_line
self.match = False
self.rl_history = History(
duplicates=config.hist_duplicates, hist_size=config.hist_length
)
# all input and output, stored as old style format strings
# (\x01, \x02, ...) for cli.py
self.screen_hist = []
self.history = [] # commands executed since beginning of session
self.redo_stack = []
self.evaluating = False
self.matches_iter = MatchesIterator()
self.funcprops = None
self.arg_pos = None
self.current_func = None
self.highlighted_paren = None
self._C = {}
self.prev_block_finished = 0
self.interact = Interaction(self.config)
# previous pastebin content to prevent duplicate pastes, filled on call
# to repl.pastebin
self.prev_pastebin_content = ""
self.prev_pastebin_url = ""
self.prev_removal_url = ""
# Necessary to fix mercurial.ui.ui expecting sys.stderr to have this
# attribute
self.closed = False
self.clipboard = get_clipboard()
if self.config.hist_file.exists():
try:
self.rl_history.load(
self.config.hist_file, getpreferredencoding() or "ascii"
)
except OSError:
pass
self.module_gatherer = ModuleGatherer(
skiplist=self.config.import_completion_skiplist
)
self.completers = autocomplete.get_default_completer(
config.autocomplete_mode, self.module_gatherer
)
if self.config.pastebin_helper:
self.paster = PasteHelper(self.config.pastebin_helper)
else:
self.paster = PastePinnwand(
self.config.pastebin_url,
self.config.pastebin_expiry,
)
@property
def ps1(self):
try:
return sys.ps1
except AttributeError:
return ">>> "
@property
def ps2(self):
try:
return sys.ps2
except AttributeError:
return "... "
def startup(self):
"""
Execute PYTHONSTARTUP file if it exits. Call this after front
end-specific initialisation.
"""
filename = os.environ.get("PYTHONSTARTUP")
if filename:
encoding = inspection.get_encoding_file(filename)
with open(filename, encoding=encoding) as f:
source = f.read()
self.interp.runsource(source, filename, "exec", encode=False)
def current_string(self, concatenate=False):
"""If the line ends in a string get it, otherwise return ''"""
tokens = self.tokenize(self.current_line)
string_tokens = list(
takewhile(
token_is_any_of([Token.String, Token.Text]), reversed(tokens)
)
)
if not string_tokens:
return ""
opening = string_tokens.pop()[1]
string = list()
for (token, value) in reversed(string_tokens):
if token is Token.Text:
continue
elif opening is None:
opening = value
elif token is Token.String.Doc:
string.append(value[3:-3])
opening = None
elif value == opening:
opening = None
if not concatenate:
string = list()
else:
string.append(value)
if opening is None:
return ""
return "".join(string)
def get_object(self, name):
attributes = name.split(".")
obj = eval(attributes.pop(0), self.interp.locals)
while attributes:
with inspection.AttrCleaner(obj):
obj = getattr(obj, attributes.pop(0))
return obj
@classmethod
def _funcname_and_argnum(cls, line):
"""Parse out the current function name and arg from a line of code."""
# each list in stack:
# [full_expr, function_expr, arg_number, opening]
# arg_number may be a string if we've encountered a keyword
# argument so we're done counting
stack = [["", "", 0, ""]]
try:
for (token, value) in Python3Lexer().get_tokens(line):
if token is Token.Punctuation:
if value in "([{":
stack.append(["", "", 0, value])
elif value in ")]}":
full, _, _, start = stack.pop()
expr = start + full + value
stack[-1][1] += expr
stack[-1][0] += expr
elif value == ",":
try:
stack[-1][2] += 1
except TypeError:
stack[-1][2] = ""
stack[-1][1] = ""
stack[-1][0] += value
elif value == ":" and stack[-1][3] == "lambda":
expr = stack.pop()[0] + ":"
stack[-1][1] += expr
stack[-1][0] += expr
else:
stack[-1][1] = ""
stack[-1][0] += value
elif (
token is Token.Number
or token in Token.Number.subtypes
or token is Token.Name
or token in Token.Name.subtypes
or token is Token.Operator
and value == "."
):
stack[-1][1] += value
stack[-1][0] += value
elif token is Token.Operator and value == "=":
stack[-1][2] = stack[-1][1]
stack[-1][1] = ""
stack[-1][0] += value
elif token is Token.Number or token in Token.Number.subtypes:
stack[-1][1] = value
stack[-1][0] += value
elif token is Token.Keyword and value == "lambda":
stack.append([value, "", 0, value])
else:
stack[-1][1] = ""
stack[-1][0] += value
while stack[-1][3] in "[{":
stack.pop()
_, _, arg_number, _ = stack.pop()
_, func, _, _ = stack.pop()
return func, arg_number
except IndexError:
return None, None
def get_args(self):
"""Check if an unclosed parenthesis exists, then attempt to get the
argspec() for it. On success, update self.funcprops,self.arg_pos and
return True, otherwise set self.funcprops to None and return False"""
self.current_func = None
if not self.config.arg_spec:
return False
func, arg_number = self._funcname_and_argnum(self.current_line)
if not func:
return False
try:
if inspection.is_eval_safe_name(func):
f = self.get_object(func)
else:
try:
fake_cursor = self.current_line.index(func) + len(func)
f = simpleeval.evaluate_current_attribute(
fake_cursor, self.current_line, self.interp.locals
)
except simpleeval.EvaluationError:
return False
if inspect.isclass(f):
class_f = None
if hasattr(f, "__init__") and f.__init__ is not object.__init__:
class_f = f.__init__
if (
(not class_f or not inspection.getfuncprops(func, class_f))
and hasattr(f, "__new__")
and f.__new__ is not object.__new__
and
# py3
f.__new__.__class__ is not object.__new__.__class__
):
class_f = f.__new__
if class_f:
f = class_f
except Exception:
# another case of needing to catch every kind of error
# since user code is run in the case of descriptors
# XXX: Make sure you raise here if you're debugging the completion
# stuff !
return False
self.current_func = f
self.funcprops = inspection.getfuncprops(func, f)
if self.funcprops:
self.arg_pos = arg_number
return True
self.arg_pos = None
return False
def get_source_of_current_name(self):
"""Return the unicode source code of the object which is bound to the
current name in the current input line. Throw `SourceNotFound` if the
source cannot be found."""
obj = self.current_func
try:
if obj is None:
line = self.current_line
if not line.strip():
raise SourceNotFound(_("Nothing to get source of"))
if inspection.is_eval_safe_name(line):
obj = self.get_object(line)
return inspection.get_source_unicode(obj)
except (AttributeError, NameError) as e:
msg = _("Cannot get source: %s") % (e,)
except OSError as e:
msg = f"{e}"
except TypeError as e:
if "built-in" in f"{e}":
msg = _("Cannot access source of %r") % (obj,)
else:
msg = _("No source code found for %s") % (self.current_line,)
raise SourceNotFound(msg)
def set_docstring(self):
self.docstring = None
if not self.get_args():
self.funcprops = None
if self.current_func is not None:
try:
self.docstring = pydoc.getdoc(self.current_func)
except IndexError:
self.docstring = None
else:
# pydoc.getdoc() returns an empty string if no
# docstring was found
if not self.docstring:
self.docstring = None
# What complete() does:
# Should we show the completion box? (are there matches, or is there a
# docstring to show?)
# Some completions should always be shown, other only if tab=True
# set the current docstring to the "current function's" docstring
# Populate the matches_iter object with new matches from the current state
# if none, clear the matches iterator
# If exactly one match that is equal to current line, clear matches
# If example one match and tab=True, then choose that and clear matches
def complete(self, tab=False):
"""Construct a full list of possible completions and
display them in a window. Also check if there's an available argspec
(via the inspect module) and bang that on top of the completions too.
The return value is whether the list_win is visible or not.
If no matches are found, just return whether there's an argspec to show
If any matches are found, save them and select the first one.
If tab is True exactly one match found, make the replacement and return
the result of running complete() again on the new line.
"""
self.set_docstring()
matches, completer = autocomplete.get_completer(
self.completers,
cursor_offset=self.cursor_offset,
line=self.current_line,
locals_=self.interp.locals,
argspec=self.funcprops,
current_block="\n".join(self.buffer + [self.current_line]),
complete_magic_methods=self.config.complete_magic_methods,
history=self.history,
)
if len(matches) == 0:
self.matches_iter.clear()
return bool(self.funcprops)
self.matches_iter.update(
self.cursor_offset, self.current_line, matches, completer
)
if len(matches) == 1:
if tab:
# if this complete is being run for a tab key press, substitute
# common sequence
(
self._cursor_offset,
self._current_line,
) = self.matches_iter.substitute_cseq()
return Repl.complete(self) # again for
elif self.matches_iter.current_word == matches[0]:
self.matches_iter.clear()
return False
return completer.shown_before_tab
else:
return tab or completer.shown_before_tab
def format_docstring(self, docstring, width, height):
"""Take a string and try to format it into a sane list of strings to be
put into the suggestion box."""
lines = docstring.split("\n")
out = []
i = 0
for line in lines:
i += 1
if not line.strip():
out.append("\n")
for block in textwrap.wrap(line, width):
out.append(" " + block + "\n")
if i >= height:
return out
i += 1
# Drop the last newline
out[-1] = out[-1].rstrip()
return out
def next_indentation(self):
"""Return the indentation of the next line based on the current
input buffer."""
if self.buffer:
indentation = next_indentation(
self.buffer[-1], self.config.tab_length
)
if indentation and self.config.dedent_after > 0:
def line_is_empty(line):
return not line.strip()
empty_lines = takewhile(line_is_empty, reversed(self.buffer))
if sum(1 for _ in empty_lines) >= self.config.dedent_after:
indentation -= 1
else:
indentation = 0
return indentation
def get_session_formatted_for_file(self):
"""Format the stdout buffer to something suitable for writing to disk,
i.e. without >>> and ... at input lines and with "# OUT: " prepended to
output lines and "### " prepended to current line"""
if hasattr(self, "all_logical_lines"):
# Curtsies
def process():
for line, lineType in self.all_logical_lines:
if lineType == LineTypeTranslator.INPUT:
yield line
elif line.rstrip():
yield "# OUT: %s" % line
yield "### %s" % self.current_line
return "\n".join(process())
else: # cli and Urwid
session_output = self.getstdout()
def process():
for line in session_output.split("\n"):
if line.startswith(self.ps1):
yield line[len(self.ps1) :]
elif line.startswith(self.ps2):
yield line[len(self.ps2) :]
elif line.rstrip():
yield f"# OUT: {line}"
return "\n".join(process())
def write2file(self):
"""Prompt for a filename and write the current contents of the stdout
buffer to disk."""
try:
fn = self.interact.file_prompt(_("Save to file (Esc to cancel): "))
if not fn:
self.interact.notify(_("Save cancelled."))
return
except ValueError:
self.interact.notify(_("Save cancelled."))
return
fn = Path(fn).expanduser()
if fn.suffix != ".py" and self.config.save_append_py:
# fn.with_suffix(".py") does not append if fn has a non-empty suffix
fn = Path(f"{fn}.py")
mode = "w"
if fn.exists():
mode = self.interact.file_prompt(
_(
"%s already exists. Do you "
"want to (c)ancel, "
" (o)verwrite or "
"(a)ppend? "
)
% (fn,)
)
if mode in ("o", "overwrite", _("overwrite")):
mode = "w"
elif mode in ("a", "append", _("append")):
mode = "a"
else:
self.interact.notify(_("Save cancelled."))
return
stdout_text = self.get_session_formatted_for_file()
try:
with open(fn, mode) as f:
f.write(stdout_text)
except OSError as e:
self.interact.notify(_("Error writing file '%s': %s") % (fn, e))
else:
self.interact.notify(_("Saved to %s.") % (fn,))
def copy2clipboard(self):
"""Copy current content to clipboard."""
if self.clipboard is None:
self.interact.notify(_("No clipboard available."))
return
content = self.get_session_formatted_for_file()
try:
self.clipboard.copy(content)
except CopyFailed:
self.interact.notify(_("Could not copy to clipboard."))
else:
self.interact.notify(_("Copied content to clipboard."))
def pastebin(self, s=None):
"""Upload to a pastebin and display the URL in the status bar."""
if s is None:
s = self.getstdout()
if self.config.pastebin_confirm and not self.interact.confirm(
_("Pastebin buffer? (y/N) ")
):
self.interact.notify(_("Pastebin aborted."))
return
return self.do_pastebin(s)
def do_pastebin(self, s):
"""Actually perform the upload."""
if s == self.prev_pastebin_content:
self.interact.notify(
_("Duplicate pastebin. Previous URL: %s. " "Removal URL: %s")
% (self.prev_pastebin_url, self.prev_removal_url),
10,
)
return self.prev_pastebin_url
self.interact.notify(_("Posting data to pastebin..."))
try:
paste_url, removal_url = self.paster.paste(s)
except PasteFailed as e:
self.interact.notify(_("Upload failed: %s") % e)
return
self.prev_pastebin_content = s
self.prev_pastebin_url = paste_url
self.prev_removal_url = removal_url
if removal_url is not None:
self.interact.notify(
_("Pastebin URL: %s - Removal URL: %s")
% (paste_url, removal_url),
10,
)
else:
self.interact.notify(_("Pastebin URL: %s") % (paste_url,), 10)
return paste_url
def push(self, s, insert_into_history=True):
"""Push a line of code onto the buffer so it can process it all
at once when a code block ends"""
# This push method is used by cli and urwid, but not curtsies
s = s.rstrip("\n")
self.buffer.append(s)
if insert_into_history:
self.insert_into_history(s)
more = self.interp.runsource("\n".join(self.buffer))
if not more:
self.buffer = []
return more
def insert_into_history(self, s):
try:
self.rl_history.append_reload_and_write(
s, self.config.hist_file, getpreferredencoding()
)
except RuntimeError as e:
self.interact.notify(f"{e}")
def prompt_undo(self):
"""Returns how many lines to undo, 0 means don't undo"""
if (
self.config.single_undo_time < 0
or self.interp.timer.estimate() < self.config.single_undo_time
):
return 1
est = self.interp.timer.estimate()
n = self.interact.file_prompt(
_("Undo how many lines? (Undo will take up to ~%.1f seconds) [1]")
% (est,)
)
try:
if n == "":
n = "1"
n = int(n)
except ValueError:
self.interact.notify(_("Undo canceled"), 0.1)
return 0
else:
if n == 0:
self.interact.notify(_("Undo canceled"), 0.1)
return 0
else:
message = ngettext(
"Undoing %d line... (est. %.1f seconds)",
"Undoing %d lines... (est. %.1f seconds)",
n,
)
self.interact.notify(message % (n, est), 0.1)
return n
def undo(self, n=1):
"""Go back in the undo history n steps and call reevaluate()
Note that in the program this is called "Rewind" because I
want it to be clear that this is by no means a true undo
implementation, it is merely a convenience bonus."""
if not self.history:
return None
self.interp.timer.reset_timer()
if len(self.history) < n:
n = len(self.history)
entries = list(self.rl_history.entries)
# Most recently undone command
last_entries = self.history[-n:]
last_entries.reverse()
self.redo_stack += last_entries
self.history = self.history[:-n]
self.reevaluate()