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repl.py
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2261 lines (1977 loc) · 83 KB
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import contextlib
import errno
import itertools
import logging
import os
import re
import signal
import subprocess
import sys
import tempfile
import time
import unicodedata
from enum import Enum
from types import FrameType, TracebackType
from typing import (
Any,
Iterable,
Dict,
List,
Optional,
Sequence,
Tuple,
Type,
Union,
)
from .._typing_compat import Literal
import greenlet
from curtsies import (
FSArray,
fmtstr,
FmtStr,
Termmode,
fmtfuncs,
events,
__version__ as curtsies_version,
)
from curtsies.configfile_keynames import keymap as key_dispatch
from curtsies.input import is_main_thread
from curtsies.window import CursorAwareWindow
from cwcwidth import wcswidth
from pygments import format as pygformat
from pygments.formatters import TerminalFormatter
from pygments.lexers import Python3Lexer
from . import events as bpythonevents, sitefix, replpainter as paint
from ..config import Config
from .coderunner import (
CodeRunner,
FakeOutput,
)
from .filewatch import ModuleChangedEventHandler
from .interaction import StatusBar
from .interpreter import (
Interp,
code_finished_will_parse,
)
from .manual_readline import (
edit_keys,
cursor_on_closing_char_pair,
AbstractEdits,
)
from .parse import parse as bpythonparse, func_for_letter, color_for_letter
from .preprocess import preprocess
from .. import __version__
from ..config import getpreferredencoding
from ..formatter import BPythonFormatter
from ..pager import get_pager_command
from ..repl import (
Repl,
SourceNotFound,
)
from ..translations import _
from ..line import CHARACTER_PAIR_MAP
logger = logging.getLogger(__name__)
INCONSISTENT_HISTORY_MSG = "#<---History inconsistent with output shown--->"
CONTIGUITY_BROKEN_MSG = "#<---History contiguity broken by rewind--->"
EXAMPLE_CONFIG_URL = "https://raw.githubusercontent.com/bpython/bpython/master/bpython/sample-config"
EDIT_SESSION_HEADER = """### current bpython session - make changes and save to reevaluate session.
### lines beginning with ### will be ignored.
### To return to bpython without reevaluating make no changes to this file
### or save an empty file.
"""
# more than this many events will be assumed to be a true paste event,
# i.e. control characters like '<Ctrl-a>' will be stripped
MAX_EVENTS_POSSIBLY_NOT_PASTE = 20
class SearchMode(Enum):
NO_SEARCH = 0
INCREMENTAL_SEARCH = 1
REVERSE_INCREMENTAL_SEARCH = 2
class LineType(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 FakeStdin:
"""The stdin object user code will reference
In user code, sys.stdin.read() asks the user for interactive input,
so this class returns control to the UI to get that input."""
def __init__(
self,
coderunner: CodeRunner,
repl: "BaseRepl",
configured_edit_keys: Optional[AbstractEdits] = None,
):
self.coderunner = coderunner
self.repl = repl
self.has_focus = False # whether FakeStdin receives keypress events
self.current_line = ""
self.cursor_offset = 0
self.old_num_lines = 0
self.readline_results: List[str] = []
if configured_edit_keys is not None:
self.rl_char_sequences = configured_edit_keys
else:
self.rl_char_sequences = edit_keys
def process_event(self, e: Union[events.Event, str]) -> None:
assert self.has_focus
logger.debug("fake input processing event %r", e)
if isinstance(e, events.Event):
if isinstance(e, events.PasteEvent):
for ee in e.events:
if ee not in self.rl_char_sequences:
self.add_input_character(ee)
elif isinstance(e, events.SigIntEvent):
self.coderunner.sigint_happened_in_main_context = True
self.has_focus = False
self.current_line = ""
self.cursor_offset = 0
self.repl.run_code_and_maybe_finish()
elif e in self.rl_char_sequences:
self.cursor_offset, self.current_line = self.rl_char_sequences[e](
self.cursor_offset, self.current_line
)
elif e == "<Ctrl-d>":
if not len(self.current_line):
self.repl.send_to_stdin("\n")
self.has_focus = False
self.current_line = ""
self.cursor_offset = 0
self.repl.run_code_and_maybe_finish(for_code="")
elif e in ("\n", "\r", "<Ctrl-j>", "<Ctrl-m>"):
line = f"{self.current_line}\n"
self.repl.send_to_stdin(line)
self.has_focus = False
self.current_line = ""
self.cursor_offset = 0
self.repl.run_code_and_maybe_finish(for_code=line)
elif e != "<ESC>": # add normal character
self.add_input_character(e)
if not self.current_line.endswith(("\n", "\r")):
self.repl.send_to_stdin(self.current_line)
def add_input_character(self, e: str) -> None:
if e == "<SPACE>":
e = " "
if e.startswith("<") and e.endswith(">"):
return
assert len(e) == 1, "added multiple characters: %r" % e
logger.debug("adding normal char %r to current line", e)
self.current_line = (
self.current_line[: self.cursor_offset]
+ e
+ self.current_line[self.cursor_offset :]
)
self.cursor_offset += 1
def readline(self, size: int = -1) -> str:
if not isinstance(size, int):
raise TypeError(
f"'{type(size).__name__}' object cannot be interpreted as an integer"
)
elif size == 0:
return ""
self.has_focus = True
self.repl.send_to_stdin(self.current_line)
value = self.coderunner.request_from_main_context()
assert isinstance(value, str)
self.readline_results.append(value)
return value if size <= -1 else value[:size]
def readlines(self, size: Optional[int] = -1) -> List[str]:
if size is None:
# the default readlines implementation also accepts None
size = -1
if not isinstance(size, int):
raise TypeError("argument should be integer or None, not 'str'")
if size <= 0:
# read as much as we can
return list(iter(self.readline, ""))
lines = []
while size > 0:
line = self.readline()
lines.append(line)
size -= len(line)
return lines
def __iter__(self):
return iter(self.readlines())
def isatty(self) -> bool:
return True
def flush(self) -> None:
"""Flush the internal buffer. This is a no-op. Flushing stdin
doesn't make any sense anyway."""
def write(self, value):
# XXX IPython expects sys.stdin.write to exist, there will no doubt be
# others, so here's a hack to keep them happy
raise OSError(errno.EBADF, "sys.stdin is read-only")
def close(self) -> None:
# hack to make closing stdin a nop
# This is useful for multiprocessing.Process, which does work
# for the most part, although output from other processes is
# discarded.
pass
@property
def encoding(self) -> str:
return sys.__stdin__.encoding
# TODO write a read() method?
class ReevaluateFakeStdin:
"""Stdin mock used during reevaluation (undo) so raw_inputs don't have to
be reentered"""
def __init__(self, fakestdin: FakeStdin, repl: "BaseRepl"):
self.fakestdin = fakestdin
self.repl = repl
self.readline_results = fakestdin.readline_results[:]
def readline(self):
if self.readline_results:
value = self.readline_results.pop(0)
else:
value = "no saved input available"
self.repl.send_to_stdouterr(value)
return value
class ImportLoader:
"""Wrapper for module loaders to watch their paths with watchdog."""
def __init__(self, watcher, loader):
self.watcher = watcher
self.loader = loader
def __getattr__(self, name):
if name == "create_module" and hasattr(self.loader, name):
return self._create_module
return getattr(self.loader, name)
def _create_module(self, spec):
module_object = self.loader.create_module(spec)
if (
getattr(spec, "origin", None) is not None
and spec.origin != "builtin"
):
self.watcher.track_module(spec.origin)
return module_object
class ImportFinder:
"""Wrapper for finders in sys.meta_path to wrap all loaders with ImportLoader."""
def __init__(self, watcher, finder):
self.watcher = watcher
self.finder = finder
def __getattr__(self, name):
if name == "find_spec" and hasattr(self.finder, name):
return self._find_spec
return getattr(self.finder, name)
def _find_spec(self, fullname, path, target=None):
# Attempt to find the spec
spec = self.finder.find_spec(fullname, path, target)
if spec is not None:
if getattr(spec, "loader", None) is not None:
# Patch the loader to enable reloading
spec.loader = ImportLoader(self.watcher, spec.loader)
return spec
def _process_ps(ps, default_ps: str):
"""Replace ps1/ps2 with the default if the user specified value contains control characters."""
if not isinstance(ps, str):
return ps
return ps if wcswidth(ps) >= 0 else default_ps
class BaseRepl(Repl):
"""Python Repl
Reacts to events like
- terminal dimensions and change events
- keystrokes
Behavior altered by
- number of scroll downs that were necessary to render array after each
display
- initial cursor position
outputs:
- 2D array to be rendered
BaseRepl is mostly view-independent state of Repl - but self.width and
self.height are important for figuring out how to wrap lines for example.
Usually self.width and self.height should be set by receiving a window
resize event, not manually set to anything - as long as the first event
received is a window resize event, this works fine.
Subclasses are responsible for implementing several methods.
"""
def __init__(
self,
config: Config,
window: CursorAwareWindow,
locals_: Optional[Dict[str, Any]] = None,
banner: Optional[str] = None,
interp: Optional[Interp] = None,
orig_tcattrs: Optional[List[Any]] = None,
):
"""
locals_ is a mapping of locals to pass into the interpreter
config is a bpython config.Struct with config attributes
banner is a string to display briefly in the status bar
interp is an interpreter instance to use
original terminal state, useful for shelling out with normal terminal
"""
logger.debug("starting init")
self.window = window
# If creating a new interpreter on undo would be unsafe because initial
# state was passed in
self.weak_rewind = bool(locals_ or interp)
if interp is None:
interp = Interp(locals=locals_)
interp.write = self.send_to_stdouterr # type: ignore
if banner is None:
if config.help_key:
banner = (
_("Welcome to bpython!")
+ " "
+ _("Press <%s> for help.") % config.help_key
)
else:
banner = None
if config.cli_suggestion_width <= 0 or config.cli_suggestion_width > 1:
config.cli_suggestion_width = 1
self.reevaluating = False
self.fake_refresh_requested = False
self.status_bar = StatusBar(
config,
"",
request_refresh=self.request_refresh,
schedule_refresh=self.schedule_refresh,
)
self.edit_keys = edit_keys.mapping_with_config(config, key_dispatch)
logger.debug("starting parent init")
# interp is a subclass of repl.Interpreter, so it definitely,
# implements the methods of Interpreter!
super().__init__(interp, config)
self.formatter = BPythonFormatter(config.color_scheme)
# overwriting what bpython.Repl put there
# interact is called to interact with the status bar,
# so we're just using the same object
self.interact = self.status_bar
# logical line currently being edited, without ps1 (usually '>>> ')
self._current_line = ""
# current line of output - stdout and stdin go here
self.current_stdouterr_line: Union[str, FmtStr] = ""
# this is every line that's been displayed (input and output)
# as with formatting applied. Logical lines that exceeded the terminal width
# at the time of output are split across multiple entries in this list.
self.display_lines: List[FmtStr] = []
# this is every line that's been executed; it gets smaller on rewind
self.history = []
# This is every logical line that's been displayed, both input and output.
# Like self.history, lines are unwrapped, uncolored, and without prompt.
# Entries are tuples, where
# - the first element the line (string, not fmtsr)
# - the second element is one of 2 global constants: "input" or "output"
# (use LineType.INPUT or LineType.OUTPUT to avoid typing these strings)
self.all_logical_lines: List[Tuple[str, LineType]] = []
# formatted version of lines in the buffer kept around so we can
# unhighlight parens using self.reprint_line as called by bpython.Repl
self.display_buffer: List[FmtStr] = []
# how many times display has been scrolled down
# because there wasn't room to display everything
self.scroll_offset = 0
# cursor position relative to start of current_line, 0 is first char
self._cursor_offset = 0
self.orig_tcattrs: Optional[List[Any]] = orig_tcattrs
self.coderunner = CodeRunner(self.interp, self.request_refresh)
# filenos match the backing device for libs that expect it,
# but writing to them will do weird things to the display
self.stdout = FakeOutput(
self.coderunner,
self.send_to_stdouterr,
real_fileobj=sys.__stdout__,
)
self.stderr = FakeOutput(
self.coderunner,
self.send_to_stdouterr,
real_fileobj=sys.__stderr__,
)
self.stdin = FakeStdin(self.coderunner, self, self.edit_keys)
# next paint should clear screen
self.request_paint_to_clear_screen = False
self.request_paint_to_pad_bottom = 0
# offscreen command yields results different from scrollback buffer
self.inconsistent_history = False
# history error message has already been displayed
self.history_already_messed_up = False
# some commands act differently based on the prev event
# this list doesn't include instances of event.Event,
# only keypress-type events (no refresh screen events etc.)
self.last_events: List[Optional[str]] = [None] * 50
# displays prev events in a column on the right hand side
self.presentation_mode = False
self.paste_mode = False
self.current_match = None
self.list_win_visible = False
# whether auto reloading active
self.watching_files = config.default_autoreload
self.incr_search_mode = SearchMode.NO_SEARCH
self.incr_search_target = ""
self.original_modules = set(sys.modules.keys())
# as long as the first event received is a window resize event,
# this works fine...
try:
self.width, self.height = os.get_terminal_size()
except OSError:
# this case will trigger during unit tests when stdout is redirected
self.width = -1
self.height = -1
self.status_bar.message(banner)
self.watcher = ModuleChangedEventHandler([], self.request_reload)
if self.watcher and config.default_autoreload:
self.watcher.activate()
# The methods below should be overridden, but the default implementations
# below can be used as well.
def get_cursor_vertical_diff(self):
"""Return how the cursor moved due to a window size change"""
return 0
def get_top_usable_line(self):
"""Return the top line of display that can be rewritten"""
return 0
def get_term_hw(self):
"""Returns the current width and height of the display area."""
return (50, 10)
def _schedule_refresh(self, when: float):
"""Arrange for the bpython display to be refreshed soon.
This method will be called when the Repl wants the display to be
refreshed at a known point in the future, and as such it should
interrupt a pending request to the user for input.
Because the worst-case effect of not refreshing
is only having an out of date UI until the user enters input, a
default NOP implementation is provided."""
# The methods below must be overridden in subclasses.
def _request_refresh(self):
"""Arrange for the bpython display to be refreshed soon.
This method will be called when the Repl wants to refresh the display,
but wants control returned to it afterwards. (it is assumed that simply
returning from process_event will cause an event refresh)
The very next event received by process_event should be a
RefreshRequestEvent."""
raise NotImplementedError
def _request_reload(self, files_modified: Sequence[str]) -> None:
"""Like request_refresh, but for reload requests events."""
raise NotImplementedError
def request_undo(self, n=1):
"""Like request_refresh, but for undo request events."""
raise NotImplementedError
def on_suspend(self):
"""Will be called on sigtstp.
Do whatever cleanup would allow the user to use other programs."""
raise NotImplementedError
def after_suspend(self):
"""Will be called when process foregrounded after suspend.
See to it that process_event is called with None to trigger a refresh
if not in the middle of a process_event call when suspend happened."""
raise NotImplementedError
# end methods that should be overridden in subclass
def request_refresh(self):
"""Request that the bpython display to be refreshed soon."""
if self.reevaluating or self.paste_mode:
self.fake_refresh_requested = True
else:
self._request_refresh()
def request_reload(self, files_modified: Sequence[str] = ()) -> None:
"""Request that a ReloadEvent be passed next into process_event"""
if self.watching_files:
self._request_reload(files_modified)
def schedule_refresh(self, when: float = 0) -> None:
"""Schedule a ScheduledRefreshRequestEvent for when.
Such a event should interrupt if blocked waiting for keyboard input"""
if self.reevaluating or self.paste_mode:
self.fake_refresh_requested = True
else:
self._schedule_refresh(when=when)
def __enter__(self):
self.orig_stdout = sys.stdout
self.orig_stderr = sys.stderr
self.orig_stdin = sys.stdin
sys.stdout = self.stdout
sys.stderr = self.stderr
sys.stdin = self.stdin
self.orig_sigwinch_handler = signal.getsignal(signal.SIGWINCH)
self.orig_sigtstp_handler = signal.getsignal(signal.SIGTSTP)
if is_main_thread():
# This turns off resize detection and ctrl-z suspension.
signal.signal(signal.SIGWINCH, self.sigwinch_handler)
signal.signal(signal.SIGTSTP, self.sigtstp_handler)
self.orig_meta_path = sys.meta_path
if self.watcher:
meta_path = []
for finder in sys.meta_path:
meta_path.append(ImportFinder(self.watcher, finder))
sys.meta_path = meta_path
sitefix.monkeypatch_quit()
return self
def __exit__(
self,
exc_type: Optional[Type[BaseException]],
exc_val: Optional[BaseException],
exc_tb: Optional[TracebackType],
) -> Literal[False]:
sys.stdin = self.orig_stdin
sys.stdout = self.orig_stdout
sys.stderr = self.orig_stderr
if is_main_thread():
# This turns off resize detection and ctrl-z suspension.
signal.signal(signal.SIGWINCH, self.orig_sigwinch_handler)
signal.signal(signal.SIGTSTP, self.orig_sigtstp_handler)
sys.meta_path = self.orig_meta_path
return False
def sigwinch_handler(self, signum: int, frame: Optional[FrameType]) -> None:
old_rows, old_columns = self.height, self.width
self.height, self.width = self.get_term_hw()
cursor_dy = self.get_cursor_vertical_diff()
self.scroll_offset -= cursor_dy
logger.info(
"sigwinch! Changed from %r to %r",
(old_rows, old_columns),
(self.height, self.width),
)
logger.info(
"decreasing scroll offset by %d to %d",
cursor_dy,
self.scroll_offset,
)
def sigtstp_handler(self, signum: int, frame: Optional[FrameType]) -> None:
self.scroll_offset = len(self.lines_for_display)
self.__exit__(None, None, None)
self.on_suspend()
os.kill(os.getpid(), signal.SIGTSTP)
self.after_suspend()
self.__enter__()
def clean_up_current_line_for_exit(self):
"""Called when trying to exit to prep for final paint"""
logger.debug("unhighlighting paren for exit")
self.cursor_offset = -1
self.unhighlight_paren()
# Event handling
def process_event(self, e: Union[events.Event, str]) -> Optional[bool]:
"""Returns True if shutting down, otherwise returns None.
Mostly mutates state of Repl object"""
logger.debug("processing event %r", e)
if isinstance(e, events.Event):
return self.process_control_event(e)
else:
self.last_events.append(e)
self.last_events.pop(0)
self.process_key_event(e)
return None
def process_control_event(self, e: events.Event) -> Optional[bool]:
if isinstance(e, bpythonevents.ScheduledRefreshRequestEvent):
# This is a scheduled refresh - it's really just a refresh (so nop)
pass
elif isinstance(e, bpythonevents.RefreshRequestEvent):
logger.info("received ASAP refresh request event")
if self.status_bar.has_focus:
self.status_bar.process_event(e)
else:
assert self.coderunner.code_is_waiting
self.run_code_and_maybe_finish()
elif self.status_bar.has_focus:
self.status_bar.process_event(e)
# handles paste events for both stdin and repl
elif isinstance(e, events.PasteEvent):
ctrl_char = compress_paste_event(e)
if ctrl_char is not None:
return self.process_event(ctrl_char)
with self.in_paste_mode():
# Might not really be a paste, UI might just be lagging
if len(e.events) <= MAX_EVENTS_POSSIBLY_NOT_PASTE and any(
not is_simple_event(ee) for ee in e.events
):
for ee in e.events:
if self.stdin.has_focus:
self.stdin.process_event(ee)
else:
self.process_event(ee)
else:
simple_events = just_simple_events(e.events)
source = preprocess(
"".join(simple_events), self.interp.compile
)
for ee in source:
if self.stdin.has_focus:
self.stdin.process_event(ee)
else:
self.process_simple_keypress(ee)
elif isinstance(e, bpythonevents.RunStartupFileEvent):
try:
self.startup()
except OSError as err:
self.status_bar.message(
_("Executing PYTHONSTARTUP failed: %s") % (err,)
)
elif isinstance(e, bpythonevents.UndoEvent):
self.undo(n=e.n)
elif self.stdin.has_focus:
self.stdin.process_event(e)
elif isinstance(e, events.SigIntEvent):
logger.debug("received sigint event")
self.keyboard_interrupt()
elif isinstance(e, bpythonevents.ReloadEvent):
if self.watching_files:
self.clear_modules_and_reevaluate()
self.status_bar.message(
_("Reloaded at %s because %s modified.")
% (time.strftime("%X"), " & ".join(e.files_modified))
)
else:
raise ValueError("Don't know how to handle event type: %r" % e)
return None
def process_key_event(self, e: str) -> None:
# To find the curtsies name for a keypress, try
# python -m curtsies.events
if self.status_bar.has_focus:
return self.status_bar.process_event(e)
if self.stdin.has_focus:
return self.stdin.process_event(e)
if (
e
in (
key_dispatch[self.config.right_key]
+ key_dispatch[self.config.end_of_line_key]
+ ("<RIGHT>",)
)
and self.config.curtsies_right_arrow_completion
and self.cursor_offset == len(self.current_line)
# if at end of current line and user presses RIGHT (to autocomplete)
):
# then autocomplete
self.current_line += self.current_suggestion
self.cursor_offset = len(self.current_line)
elif e in ("<UP>",) + key_dispatch[self.config.up_one_line_key]:
self.up_one_line()
elif e in ("<DOWN>",) + key_dispatch[self.config.down_one_line_key]:
self.down_one_line()
elif e == "<Ctrl-d>":
self.on_control_d()
elif e == "<Ctrl-o>":
self.operate_and_get_next()
elif e == "<Esc+.>":
self.get_last_word()
elif e in key_dispatch[self.config.reverse_incremental_search_key]:
self.incremental_search(reverse=True)
elif e in key_dispatch[self.config.incremental_search_key]:
self.incremental_search()
elif (
e in (("<BACKSPACE>",) + key_dispatch[self.config.backspace_key])
and self.incr_search_mode != SearchMode.NO_SEARCH
):
self.add_to_incremental_search(self, backspace=True)
elif e in self.edit_keys.cut_buffer_edits:
self.readline_kill(e)
elif e in self.edit_keys.simple_edits:
self.cursor_offset, self.current_line = self.edit_keys.call(
e,
cursor_offset=self.cursor_offset,
line=self.current_line,
cut_buffer=self.cut_buffer,
)
elif e in key_dispatch[self.config.cut_to_buffer_key]:
self.cut_to_buffer()
elif e in key_dispatch[self.config.reimport_key]:
self.clear_modules_and_reevaluate()
elif e in key_dispatch[self.config.toggle_file_watch_key]:
self.toggle_file_watch()
elif e in key_dispatch[self.config.clear_screen_key]:
self.request_paint_to_clear_screen = True
elif e in key_dispatch[self.config.show_source_key]:
self.show_source()
elif e in key_dispatch[self.config.help_key]:
self.pager(self.help_text())
elif e in key_dispatch[self.config.exit_key]:
raise SystemExit()
elif e in ("\n", "\r", "<PADENTER>", "<Ctrl-j>", "<Ctrl-m>"):
self.on_enter()
elif e == "<TAB>": # tab
self.on_tab()
elif e == "<Shift-TAB>":
self.on_tab(back=True)
elif e in key_dispatch[self.config.undo_key]: # ctrl-r for undo
self.prompt_undo()
elif e in key_dispatch[self.config.redo_key]: # ctrl-g for redo
self.redo()
elif e in key_dispatch[self.config.save_key]: # ctrl-s for save
greenlet.greenlet(self.write2file).switch()
elif e in key_dispatch[self.config.pastebin_key]: # F8 for pastebin
greenlet.greenlet(self.pastebin).switch()
elif e in key_dispatch[self.config.copy_clipboard_key]:
greenlet.greenlet(self.copy2clipboard).switch()
elif e in key_dispatch[self.config.external_editor_key]:
self.send_session_to_external_editor()
elif e in key_dispatch[self.config.edit_config_key]:
greenlet.greenlet(self.edit_config).switch()
# TODO add PAD keys hack as in bpython.cli
elif e in key_dispatch[self.config.edit_current_block_key]:
self.send_current_block_to_external_editor()
elif e == "<ESC>":
self.incr_search_mode = SearchMode.NO_SEARCH
elif e == "<SPACE>":
self.add_normal_character(" ")
elif e in CHARACTER_PAIR_MAP.keys():
if e in ["'", '"']:
if self.is_closing_quote(e):
self.insert_char_pair_end(e)
else:
self.insert_char_pair_start(e)
else:
self.insert_char_pair_start(e)
elif e in CHARACTER_PAIR_MAP.values():
self.insert_char_pair_end(e)
else:
self.add_normal_character(e)
def is_closing_quote(self, e: str) -> bool:
char_count = self._current_line.count(e)
return (
char_count % 2 == 0
and cursor_on_closing_char_pair(
self._cursor_offset, self._current_line, e
)[0]
)
def insert_char_pair_start(self, e):
"""Accepts character which is a part of CHARACTER_PAIR_MAP
like brackets and quotes, and appends it to the line with
an appropriate character pair ending. Closing character can only be inserted
when the next character is either a closing character or a space
e.x. if you type "(" (lparen) , this will insert "()"
into the line
"""
self.add_normal_character(e)
if self.config.brackets_completion:
start_of_line = len(self._current_line) == 1
end_of_line = len(self._current_line) == self._cursor_offset
can_lookup_next = len(self._current_line) > self._cursor_offset
next_char = (
None
if not can_lookup_next
else self._current_line[self._cursor_offset]
)
if (
start_of_line
or end_of_line
or (next_char is not None and next_char in "})] ")
):
self.add_normal_character(
CHARACTER_PAIR_MAP[e], narrow_search=False
)
self._cursor_offset -= 1
def insert_char_pair_end(self, e):
"""Accepts character which is a part of CHARACTER_PAIR_MAP
like brackets and quotes, and checks whether it should be
inserted to the line or overwritten
e.x. if you type ")" (rparen) , and your cursor is directly
above another ")" (rparen) in the cmd, this will just skip
it and move the cursor.
If there is no same character underneath the cursor, the
character will be printed/appended to the line
"""
if self.config.brackets_completion:
if self.cursor_offset < len(self._current_line):
if self._current_line[self.cursor_offset] == e:
self.cursor_offset += 1
return
self.add_normal_character(e)
def get_last_word(self):
previous_word = _last_word(self.rl_history.entry)
word = _last_word(self.rl_history.back())
line = self.current_line
self._set_current_line(
line[: len(line) - len(previous_word)] + word,
reset_rl_history=False,
)
self._set_cursor_offset(
self.cursor_offset - len(previous_word) + len(word),
reset_rl_history=False,
)
def incremental_search(self, reverse=False, include_current=False):
if self.incr_search_mode == SearchMode.NO_SEARCH:
self.rl_history.enter(self.current_line)
self.incr_search_target = ""
else:
if self.incr_search_target:
line = (
self.rl_history.back(
False,
search=True,
target=self.incr_search_target,
include_current=include_current,
)
if reverse
else self.rl_history.forward(
False,
search=True,
target=self.incr_search_target,
include_current=include_current,
)
)
self._set_current_line(
line, reset_rl_history=False, clear_special_mode=False
)
self._set_cursor_offset(
len(self.current_line),
reset_rl_history=False,
clear_special_mode=False,
)
if reverse:
self.incr_search_mode = SearchMode.REVERSE_INCREMENTAL_SEARCH
else:
self.incr_search_mode = SearchMode.INCREMENTAL_SEARCH
def readline_kill(self, e):
func = self.edit_keys[e]
self.cursor_offset, self.current_line, cut = func(
self.cursor_offset, self.current_line
)
if self.last_events[-2] == e: # consecutive kill commands accumulative
if func.kills == "ahead":
self.cut_buffer += cut
elif func.kills == "behind":
self.cut_buffer = cut + self.cut_buffer
else:
raise ValueError("cut value other than 'ahead' or 'behind'")
else:
self.cut_buffer = cut
def on_enter(self, new_code=True, reset_rl_history=True):
# so the cursor isn't touching a paren TODO: necessary?
if new_code:
self.redo_stack = []
self._set_cursor_offset(-1, update_completion=False)
if reset_rl_history:
self.rl_history.reset()
self.history.append(self.current_line)
self.all_logical_lines.append((self.current_line, LineType.INPUT))
self.push(self.current_line, insert_into_history=new_code)
def on_tab(self, back=False):
"""Do something on tab key
taken from bpython.cli
Does one of the following:
1) add space to move up to the next %4==0 column
2) complete the current word with characters common to all completions
3) select the first or last match
4) select the next or previous match if already have a match
"""
def only_whitespace_left_of_cursor():
"""returns true if all characters before cursor are whitespace"""
return not self.current_line[: self.cursor_offset].strip()
logger.debug("self.matches_iter.matches: %r", self.matches_iter.matches)
if only_whitespace_left_of_cursor():
front_ws = len(self.current_line[: self.cursor_offset]) - len(
self.current_line[: self.cursor_offset].lstrip()
)
to_add = 4 - (front_ws % self.config.tab_length)
for unused in range(to_add):
self.add_normal_character(" ")
return
# if cursor on closing character from pair,
# moves cursor behind it on tab
# ? should we leave it here as default?
if self.config.brackets_completion:
on_closing_char, _ = cursor_on_closing_char_pair(
self._cursor_offset, self._current_line