# The MIT License

#

# Copyright (c) 2010-2011 Marien Zwart

#

# 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.

# This whole file typing TODO

# type: ignore

"""bpython backend based on Urwid.

Based on Urwid 0.9.9.

This steals many things from bpython's "cli" backend.

This is still *VERY* rough.

"""

import sys

import os

import time

import locale

import signal

import urwid

from typing import Optional

from . import args as bpargs, repl, translations

from .formatter import theme_map

from .translations import _

from .keys import urwid_key_dispatch as key_dispatch

# Urwid colors are:

# 'black', 'dark red', 'dark green', 'brown', 'dark blue',

# 'dark magenta', 'dark cyan', 'light gray', 'dark gray',

# 'light red', 'light green', 'yellow', 'light blue',

# 'light magenta', 'light cyan', 'white'

# and bpython has:

# blacK, Red, Green, Yellow, Blue, Magenta, Cyan, White, Default

COLORMAP = {

"k": "black",

"r": "dark red", # or light red?

"g": "dark green", # or light green?

"y": "yellow",

"b": "dark blue", # or light blue?

"m": "dark magenta", # or light magenta?

"c": "dark cyan", # or light cyan?

"w": "white",

"d": "default",

}

try:

from twisted.internet import protocol

from twisted.protocols import basic

except ImportError:

pass

else:

class EvalProtocol(basic.LineOnlyReceiver):

delimiter = "\n"

def __init__(self, myrepl):

self.repl = myrepl

def lineReceived(self, line):

# HACK!

# TODO: deal with encoding issues here...

self.repl.main_loop.process_input(line)

self.repl.main_loop.process_input(["enter"])

class EvalFactory(protocol.ServerFactory):

def __init__(self, myrepl):

self.repl = myrepl

def buildProtocol(self, addr):

return EvalProtocol(self.repl)

# If Twisted is not available urwid has no TwistedEventLoop attribute.

# Code below will try to import reactor before using TwistedEventLoop.

# I assume TwistedEventLoop will be available if that import succeeds.

if urwid.VERSION < (1, 0, 0) and hasattr(urwid, "TwistedEventLoop"):

class TwistedEventLoop(urwid.TwistedEventLoop):

"""TwistedEventLoop modified to properly stop the reactor.

urwid 0.9.9 and 0.9.9.1 crash the reactor on ExitMainLoop instead

of stopping it. One obvious way this breaks is if anything used

the reactor's thread pool: that thread pool is not shut down if

the reactor is not stopped, which means python hangs on exit

(joining the non-daemon threadpool threads that never exit). And

the default resolver is the ThreadedResolver, so if we looked up

any names we hang on exit. That is bad enough that we hack up

urwid a bit here to exit properly.

"""

def handle_exit(self, f):

def wrapper(*args, **kwargs):

try:

return f(*args, **kwargs)

except urwid.ExitMainLoop:

# This is our change.

self.reactor.stop()

except:

# This is the same as in urwid.

# We are obviously not supposed to ever hit this.

print(sys.exc_info())

self._exc_info = sys.exc_info()

self.reactor.crash()

return wrapper

else:

TwistedEventLoop = getattr(urwid, "TwistedEventLoop", None)

class StatusbarEdit(urwid.Edit):

"""Wrapper around urwid.Edit used for the prompt in Statusbar.

This class only adds a single signal that is emitted if the user presses

Enter."""

signals = urwid.Edit.signals + ["prompt_enter"]

def __init__(self, *args, **kwargs):

self.single = False

super().__init__(*args, **kwargs)

def keypress(self, size, key):

if self.single:

urwid.emit_signal(self, "prompt_enter", self, key)

elif key == "enter":

urwid.emit_signal(self, "prompt_enter", self, self.get_edit_text())

else:

return super().keypress(size, key)

urwid.register_signal(StatusbarEdit, "prompt_enter")

class Statusbar:

"""Statusbar object, ripped off from bpython.cli.

This class provides the status bar at the bottom of the screen.

It has message() and prompt() methods for user interactivity, as

well as settext() and clear() methods for changing its appearance.

The check() method needs to be called repeatedly if the statusbar is

going to be aware of when it should update its display after a message()

has been called (it'll display for a couple of seconds and then disappear).

It should be called as:

foo = Statusbar('Initial text to display')

or, for a blank statusbar:

foo = Statusbar()

The "widget" attribute is an urwid widget.

"""

signals = ["prompt_result"]

def __init__(self, config, s=None, main_loop=None):

self.config = config

self.timer = None

self.main_loop = main_loop

self.s = s or ""

self.text = urwid.Text(("main", self.s))

# use wrap mode 'clip' to just cut off at the end of line

self.text.set_wrap_mode("clip")

self.edit = StatusbarEdit(("main", ""))

urwid.connect_signal(self.edit, "prompt_enter", self._on_prompt_enter)

self.widget = urwid.Columns([self.text, self.edit])

def _check(self, callback, userdata=None):

"""This is the method is called from the timer to reset the status bar."""

self.timer = None

self.settext(self.s)

def message(self, s, n=3):

"""Display a message for a short n seconds on the statusbar and return

it to its original state."""

self.settext(s)

self.timer = self.main_loop.set_alarm_in(n, self._check)

def _reset_timer(self):

"""Reset the timer from message."""

if self.timer is not None:

self.main_loop.remove_alarm(self.timer)

self.timer = None

def prompt(self, s=None, single=False):

"""Prompt the user for some input (with the optional prompt 's'). After

the user hit enter the signal 'prompt_result' will be emitted and the

status bar will be reset. If single is True, the first keypress will be

returned."""

self._reset_timer()

self.edit.single = single

self.edit.set_caption(("main", s or "?"))

self.edit.set_edit_text("")

# hide the text and display the edit widget

if self.edit not in self.widget.widget_list:

self.widget.widget_list.append(self.edit)

if self.text in self.widget.widget_list:

self.widget.widget_list.remove(self.text)

self.widget.set_focus_column(0)

def settext(self, s, permanent=False):

"""Set the text on the status bar to a new value. If permanent is True,

the new value will be permanent. If that status bar is in prompt mode,

the prompt will be aborted."""

self._reset_timer()

# hide the edit and display the text widget

if self.edit in self.widget.widget_list:

self.widget.widget_list.remove(self.edit)

if self.text not in self.widget.widget_list:

self.widget.widget_list.append(self.text)

self.text.set_text(("main", s))

if permanent:

self.s = s

def clear(self):

"""Clear the status bar."""

self.settext("")

def _on_prompt_enter(self, edit, new_text):

"""Reset the statusbar and pass the input from the prompt to the caller

via 'prompt_result'."""

self.settext(self.s)

urwid.emit_signal(self, "prompt_result", new_text)

urwid.register_signal(Statusbar, "prompt_result")

def decoding_input_filter(keys, raw):

"""Input filter for urwid which decodes each key with the locale's

preferred encoding.'"""

encoding = locale.getpreferredencoding()

converted_keys = list()

for key in keys:

if isinstance(key, str):

converted_keys.append(key.decode(encoding))

else:

converted_keys.append(key)

return converted_keys

def format_tokens(tokensource):

for token, text in tokensource:

if text == "\n":

continue

# TODO: something about inversing Parenthesis

while token not in theme_map:

token = token.parent

yield (theme_map[token], text)

class BPythonEdit(urwid.Edit):

"""Customized editor *very* tightly interwoven with URWIDRepl.

Changes include:

- The edit text supports markup, not just the caption.

This works by calling set_edit_markup from the change event

as well as whenever markup changes while text does not.

- The widget can be made readonly, which currently just means

it is no longer selectable and stops drawing the cursor.

This is currently a one-way operation, but that is just because

I only need and test the readwrite->readonly transition.

- move_cursor_to_coords is ignored

(except for internal calls from keypress or mouse_event).

- arrow up/down are ignored.

- an "edit-pos-changed" signal is emitted when edit_pos changes.

"""

signals = ["edit-pos-changed"]

def __init__(self, config, *args, **kwargs):

self._bpy_text = ""

self._bpy_attr = []

self._bpy_selectable = True

self._bpy_may_move_cursor = False

self.config = config

self.tab_length = config.tab_length

super().__init__(*args, **kwargs)

def set_edit_pos(self, pos):

super().set_edit_pos(pos)

self._emit("edit-pos-changed", self.edit_pos)

def get_edit_pos(self):

return self._edit_pos

edit_pos = property(get_edit_pos, set_edit_pos)

def make_readonly(self):

self._bpy_selectable = False

# This is necessary to prevent the listbox we are in getting

# fresh cursor coords of None from get_cursor_coords

# immediately after we go readonly and then getting a cached

# canvas that still has the cursor set. It spots that

# inconsistency and raises.

self._invalidate()

def set_edit_markup(self, markup):

"""Call this when markup changes but the underlying text does not.

You should arrange for this to be called from the 'change' signal.

"""

if markup:

self._bpy_text, self._bpy_attr = urwid.decompose_tagmarkup(markup)

else:

# decompose_tagmarkup in some urwids fails on the empty list

self._bpy_text, self._bpy_attr = "", []

# This is redundant when we're called off the 'change' signal.

# I'm assuming this is cheap, making that ok.

self._invalidate()

def get_text(self):

return self._caption + self._bpy_text, self._attrib + self._bpy_attr

def selectable(self):

return self._bpy_selectable

def get_cursor_coords(self, *args, **kwargs):

# urwid gets confused if a nonselectable widget has a cursor position.

if not self._bpy_selectable:

return None

return super().get_cursor_coords(*args, **kwargs)

def render(self, size, focus=False):

# XXX I do not want to have to do this, but listbox gets confused

# if I do not (getting None out of get_cursor_coords because

# we just became unselectable, then having this render a cursor)

if not self._bpy_selectable:

focus = False

return super().render(size, focus=focus)

def get_pref_col(self, size):

# Need to make this deal with us being nonselectable

if not self._bpy_selectable:

return "left"

return super().get_pref_col(size)

def move_cursor_to_coords(self, *args):

if self._bpy_may_move_cursor:

return super().move_cursor_to_coords(*args)

return False

def keypress(self, size, key):

if urwid.command_map[key] in ("cursor up", "cursor down"):

# Do not handle up/down arrow, leave them for the repl.

return key

self._bpy_may_move_cursor = True

try:

if urwid.command_map[key] == "cursor max left":

self.edit_pos = 0

elif urwid.command_map[key] == "cursor max right":

self.edit_pos = len(self.get_edit_text())

elif urwid.command_map[key] == "clear word":

# ^w

if self.edit_pos == 0:

return

line = self.get_edit_text()

# delete any space left of the cursor

p = len(line[: self.edit_pos].strip())

line = line[:p] + line[self.edit_pos :]

# delete a full word

np = line.rfind(" ", 0, p)

if np == -1:

line = line[p:]

np = 0

else:

line = line[:np] + line[p:]

self.set_edit_text(line)

self.edit_pos = np

elif urwid.command_map[key] == "clear line":

line = self.get_edit_text()

self.set_edit_text(line[self.edit_pos :])

self.edit_pos = 0

elif key == "backspace":

line = self.get_edit_text()

cpos = len(line) - self.edit_pos

if not (cpos or len(line) % self.tab_length or line.strip()):

self.set_edit_text(line[: -self.tab_length])

else:

return super().keypress(size, key)

else:

# TODO: Add in specific keypress fetching code here

return super().keypress(size, key)

return None

finally:

self._bpy_may_move_cursor = False

def mouse_event(self, *args):

self._bpy_may_move_cursor = True

try:

return super().mouse_event(*args)

finally:

self._bpy_may_move_cursor = False

class BPythonListBox(urwid.ListBox):

"""Like `urwid.ListBox`, except that it does not eat up and

down keys.

"""

def keypress(self, size, key):

if key not in ("up", "down"):

return urwid.ListBox.keypress(self, size, key)

return key

class Tooltip(urwid.BoxWidget):

"""Container inspired by Overlay to position our tooltip.

bottom_w should be a BoxWidget.

The top window currently has to be a listbox to support shrinkwrapping.

This passes keyboard events to the bottom instead of the top window.

It also positions the top window relative to the cursor position

from the bottom window and hides it if there is no cursor.

"""

def __init__(self, bottom_w, listbox):

super().__init__()

self.bottom_w = bottom_w

self.listbox = listbox

# TODO: this linebox should use the 'main' color.

self.top_w = urwid.LineBox(listbox)

self.tooltip_focus = False

def selectable(self):

return self.bottom_w.selectable()

def keypress(self, size, key):

return self.bottom_w.keypress(size, key)

def mouse_event(self, size, event, button, col, row, focus):

# TODO: pass to top widget if visible and inside it.

if not hasattr(self.bottom_w, "mouse_event"):

return False

return self.bottom_w.mouse_event(size, event, button, col, row, focus)

def get_cursor_coords(self, size):

return self.bottom_w.get_cursor_coords(size)

def render(self, size, focus=False):

maxcol, maxrow = size

bottom_c = self.bottom_w.render(size, focus)

cursor = bottom_c.cursor

if not cursor:

# Hide the tooltip if there is no cursor.

return bottom_c

cursor_x, cursor_y = cursor

if cursor_y * 2 < maxrow:

# Cursor is in the top half. Tooltip goes below it:

y = cursor_y + 1

rows = maxrow - y

else:

# Cursor is in the bottom half. Tooltip fills the area above:

y = 0

rows = cursor_y

# HACK: shrink-wrap the tooltip. This is ugly in multiple ways:

# - It only works on a listbox.

# - It assumes the wrapping LineBox eats one char on each edge.

# - It is a loop.

# (ideally it would check how much free space there is,

# instead of repeatedly trying smaller sizes)

while "bottom" in self.listbox.ends_visible((maxcol - 2, rows - 3)):

rows -= 1

# If we're displaying above the cursor move the top edge down:

if not y:

y = cursor_y - rows

# Render *both* windows focused. This is probably not normal in urwid,

# but it works nicely.

top_c = self.top_w.render((maxcol, rows), focus and self.tooltip_focus)

combi_c = urwid.CanvasOverlay(top_c, bottom_c, 0, y)

# Use the cursor coordinates from the bottom canvas.

canvas = urwid.CompositeCanvas(combi_c)

canvas.cursor = cursor

return canvas

class URWIDInteraction(repl.Interaction):

def __init__(self, config, statusbar, frame):

super().__init__(config)

self.statusbar = statusbar

self.frame = frame

urwid.connect_signal(statusbar, "prompt_result", self._prompt_result)

self.callback = None

def confirm(self, q, callback):

"""Ask for yes or no and call callback to return the result"""

def callback_wrapper(result):

callback(result.lower() in (_("y"), _("yes")))

self.prompt(q, callback_wrapper, single=True)

def notify(self, s, n=10, wait_for_keypress=False):

return self.statusbar.message(s, n)

def prompt(self, s, callback=None, single=False):

"""Prompt the user for input. The result will be returned via calling

callback. Note that there can only be one prompt active. But the

callback can already start a new prompt."""

if self.callback is not None:

raise Exception("Prompt already in progress")

self.callback = callback

self.statusbar.prompt(s, single=single)

self.frame.set_focus("footer")

def _prompt_result(self, text):

self.frame.set_focus("body")

if self.callback is not None:

# The callback might want to start another prompt, so reset it

# before calling the callback.

callback = self.callback

self.callback = None

callback(text)

def file_prompt(self, s: str) -> Optional[str]:

raise NotImplementedError

class URWIDRepl(repl.Repl):

_time_between_redraws = 0.05 # seconds

def __init__(self, event_loop, palette, interpreter, config):

super().__init__(interpreter, config)

self._redraw_handle = None

self._redraw_pending = False

self._redraw_time = 0

self.listbox = BPythonListBox(urwid.SimpleListWalker([]))

self.tooltip = urwid.ListBox(urwid.SimpleListWalker([]))

self.tooltip.grid = None

self.overlay = Tooltip(self.listbox, self.tooltip)

self.stdout_hist = "" # native str (unicode in Py3)

self.frame = urwid.Frame(self.overlay)

if urwid.get_encoding_mode() == "narrow":

input_filter = decoding_input_filter

else:

input_filter = None

# This constructs a raw_display.Screen, which nabs sys.stdin/out.

self.main_loop = urwid.MainLoop(

self.frame,

palette,

event_loop=event_loop,

unhandled_input=self.handle_input,

input_filter=input_filter,

handle_mouse=False,

)

# String is straight from bpython.cli

self.statusbar = Statusbar(

config,

_(

" <%s> Rewind <%s> Save <%s> Pastebin "

" <%s> Pager <%s> Show Source "

)

% (

config.undo_key,

config.save_key,

config.pastebin_key,

config.last_output_key,

config.show_source_key,

),

self.main_loop,

)

self.frame.set_footer(self.statusbar.widget)

self.interact = URWIDInteraction(

self.config, self.statusbar, self.frame

)

self.edits = []

self.edit = None

self.current_output = None

self._completion_update_suppressed = False

# Bulletproof: this is a value extract_exit_value accepts.

self.exit_value = ()

load_urwid_command_map(config)

# Subclasses of Repl need to implement echo, current_line, cw

def echo(self, orig_s):

s = orig_s.rstrip("\n")

if s:

if self.current_output is None:

self.current_output = urwid.Text(("output", s))

if self.edit is None:

self.listbox.body.append(self.current_output)

# Focus the widget we just added to force the

# listbox to scroll. This causes output to scroll

# if the user runs a blocking call that prints

# more than a screenful, instead of staying

# scrolled to the previous input line and then

# jumping to the bottom when done.

self.listbox.set_focus(len(self.listbox.body) - 1)

else:

self.listbox.body.insert(-1, self.current_output)

# The edit widget should be focused and *stay* focused.

# XXX TODO: make sure the cursor stays in the same spot.

self.listbox.set_focus(len(self.listbox.body) - 1)

else:

# XXX this assumes this all has "output" markup applied.

self.current_output.set_text(

("output", self.current_output.text + s)

)

if orig_s.endswith("\n"):

self.current_output = None

# If we hit this repeatedly in a loop the redraw is rather

# slow (testcase: pprint(__builtins__). So if we have recently

# drawn the screen already schedule a call in the future.

#

# Unfortunately we may hit this function repeatedly through a

# blocking call triggered by the user, in which case our

# timeout will not run timely as we do not return to urwid's

# eventloop. So we manually check if our timeout has long

# since expired, and redraw synchronously if it has.

if self._redraw_handle is None:

self.main_loop.draw_screen()

def maybe_redraw(loop, self):

if self._redraw_pending:

loop.draw_screen()

self._redraw_pending = False

self._redraw_handle = None

self._redraw_handle = self.main_loop.set_alarm_in(

self._time_between_redraws, maybe_redraw, self

)

self._redraw_time = time.time()

else:

self._redraw_pending = True

now = time.time()

if now - self._redraw_time > 2 * self._time_between_redraws:

# The timeout is well past expired, assume we're

# blocked and redraw synchronously.

self.main_loop.draw_screen()

self._redraw_time = now

def _get_current_line(self):

if self.edit is None:

return ""

return self.edit.get_edit_text()

def _set_current_line(self, line):

self.edit.set_edit_text(line)

current_line = property(

_get_current_line,

_set_current_line,

None,

"Return the current line (the one the cursor is in).",

)

def cw(self):

"""Return the current word (incomplete word left of cursor)."""

if self.edit is None:

return

pos = self.edit.edit_pos

text = self.edit.get_edit_text()

if pos != len(text):

# Disable autocomplete if not at end of line, like cli does.

return

# Stolen from cli. TODO: clean up and split out.

if not text or (not text[-1].isalnum() and text[-1] not in (".", "_")):

return

# Seek backwards in text for the first non-identifier char:

for i, c in enumerate(reversed(text)):

if not c.isalnum() and c not in (".", "_"):

break

else:

# No non-identifiers, return everything.

return text

# Return everything to the right of the non-identifier.

return text[-i:]

@property

def cpos(self):

if self.edit is not None:

return len(self.current_line) - self.edit.edit_pos

return 0

def _get_cursor_offset(self):

return self.edit.edit_pos

def _set_cursor_offset(self, offset):

self.edit.edit_pos = offset

cursor_offset = property(

_get_cursor_offset,

_set_cursor_offset,

None,

"The cursor offset from the beginning of the line",

)

def _populate_completion(self):

widget_list = self.tooltip.body

while widget_list:

widget_list.pop()

# This is just me flailing around wildly. TODO: actually write.

if self.complete():

if self.funcprops:

# This is mostly just stolen from the cli module.

func_name = self.funcprops.func

args = self.funcprops.argspec.args

is_bound = self.funcprops.is_bound_method

in_arg = self.arg_pos

varargs = self.funcprops.argspec.varargs

varkw = self.funcprops.argspec.varkwargs

defaults = self.funcprops.argspec.defaults

kwonly = self.funcprops.argspec.kwonly

kwonly_defaults = self.funcprops.argspec.kwonly_defaults or {}

markup = [("bold name", func_name), ("name", ": (")]

# the isinstance checks if we're in a positional arg

# (instead of a keyword arg), I think

if is_bound and isinstance(in_arg, int):

in_arg += 1

# bpython.cli checks if this goes off the edge and

# does clever wrapping. I do not (yet).

for k, i in enumerate(args):

if defaults and k + 1 > len(args) - len(defaults):

kw = repr(defaults[k - (len(args) - len(defaults))])

else:

kw = None

if not k and str(i) == "self":

color = "name"

else:

color = "token"

if k == in_arg or i == in_arg:

color = "bold " + color

markup.append((color, str(i)))

if kw is not None:

markup.extend([("punctuation", "="), ("token", kw)])

if k != len(args) - 1:

markup.append(("punctuation", ", "))

if varargs:

if args:

markup.append(("punctuation", ", "))

markup.append(("token", "*" + varargs))

if kwonly:

if not varargs:

if args:

markup.append(("punctuation", ", "))

markup.append(("punctuation", "*"))

for arg in kwonly:

if arg == in_arg:

color = "bold token"

else:

color = "token"

markup.extend([("punctuation", ", "), (color, arg)])

if arg in kwonly_defaults:

markup.extend(

[

("punctuation", "="),

("token", repr(kwonly_defaults[arg])),

]

)

if varkw:

if args or varargs or kwonly:

markup.append(("punctuation", ", "))

markup.append(("token", "**" + varkw))

markup.append(("punctuation", ")"))

widget_list.append(urwid.Text(markup))

if self.matches_iter.matches:

attr_map = {}

focus_map = {"main": "operator"}

texts = [

urwid.AttrMap(

urwid.Text(("main", match)), attr_map, focus_map

)

for match in self.matches_iter.matches

]

width = max(text.original_widget.pack()[0] for text in texts)

gridflow = urwid.GridFlow(texts, width, 1, 0, "left")

widget_list.append(gridflow)

self.tooltip.grid = gridflow

self.overlay.tooltip_focus = False

else:

self.tooltip.grid = None

self.frame.body = self.overlay

else:

self.frame.body = self.listbox

self.tooltip.grid = None

if self.docstring:

# TODO: use self.format_docstring? needs a width/height...

docstring = self.docstring

widget_list.append(urwid.Text(("comment", docstring)))

def reprint_line(self, lineno, tokens):

edit = self.edits[-len(self.buffer) + lineno - 1]

edit.set_edit_markup(list(format_tokens(tokens)))

def getstdout(self):

"""This method returns the 'spoofed' stdout buffer, for writing to a

file or sending to a pastebin or whatever."""

return self.stdout_hist + "\n"

def ask_confirmation(self, q):

"""Ask for yes or no and return boolean"""

try:

reply = self.statusbar.prompt(q)

except ValueError:

return False

return reply.lower() in ("y", "yes")

def reevaluate(self):

"""Clear the buffer, redraw the screen and re-evaluate the history"""

self.evaluating = True

self.stdout_hist = ""

self.f_string = ""

self.buffer = []

self.scr.erase()

# Set cursor position to -1 to prevent paren matching

self.cpos = -1

self.prompt(False)

self.iy, self.ix = self.scr.getyx()

for line in self.history:

self.stdout_hist += line + "\n"

self.print_line(line)

# I decided it was easier to just do this manually

# than to make the print_line and history stuff more flexible.

self.scr.addstr("\n")

more = self.push(line)

self.prompt(more)

self.iy, self.ix = self.scr.getyx()

self.cpos = 0

indent = repl.next_indentation(self.s, self.config.tab_length)

self.s = ""

self.scr.refresh()

if self.buffer:

for unused in range(indent):

self.tab()

self.evaluating = False

# map(self.push, self.history)

# ^-- That's how simple this method was at first :(

def write(self, s):

"""For overriding stdout defaults"""

if "\x04" in s:

for block in s.split("\x04"):

self.write(block)

return

if s.rstrip() and "\x03" in s:

t = s.split("\x03")[1]

else:

t = s

if not self.stdout_hist:

self.stdout_hist = t

else:

self.stdout_hist += t

self.echo(s)

def push(self, s, insert_into_history=True):

# Restore the original SIGINT handler. This is needed to be able

# to break out of infinite loops. If the interpreter itself

# sees this it prints 'KeyboardInterrupt' and returns (good).

orig_handler = signal.getsignal(signal.SIGINT)

signal.signal(signal.SIGINT, signal.default_int_handler)

# Pretty blindly adapted from bpython.cli

try:

return super().push(s, insert_into_history)

except SystemExit as e:

self.exit_value = e.args

raise urwid.ExitMainLoop()

except KeyboardInterrupt:

# KeyboardInterrupt happened between the except block around

# user code execution and this code. This should be rare,

# but make sure to not kill bpython here, so leaning on

# ctrl+c to kill buggy code running inside bpython is safe.

self.keyboard_interrupt()

finally:

signal.signal(signal.SIGINT, orig_handler)

def start(self):

self.prompt(False)

def keyboard_interrupt(self):

# If the user is currently editing, interrupt him. This

# mirrors what the regular python REPL does.

if self.edit is not None:

# XXX this is a lot of code, and I am not sure it is

# actually enough code. Needs some testing.

self.edit.make_readonly()

self.edit = None

self.buffer = []

self.echo("KeyboardInterrupt")

self.prompt(False)

else:

# I do not quite remember if this is reachable, but let's

# be safe.

self.echo("KeyboardInterrupt")

def prompt(self, more):

# Clear current output here, or output resulting from the

# current prompt run will end up appended to the edit widget

# sitting above this prompt:

self.current_output = None

# XXX is this the right place?

self.rl_history.reset()

# We need the caption to use unicode as urwid normalizes later

# input to be the same type, using ascii as encoding. If the

# caption is bytes this breaks typing non-ascii into bpython.

if not more:

caption = ("prompt", self.ps1)

self.stdout_hist += self.ps1

else:

caption = ("prompt_more", self.ps2)

self.stdout_hist += self.ps2

self.edit = BPythonEdit(self.config, caption=caption)

urwid.connect_signal(self.edit, "change", self.on_input_change)

urwid.connect_signal(

self.edit, "edit-pos-changed", self.on_edit_pos_changed

)

# Do this after connecting the change signal handler:

self.edit.insert_text(4 * self.next_indentation() * " ")

self.edits.append(self.edit)

self.listbox.body.append(self.edit)

self.listbox.set_focus(len(self.listbox.body) - 1)