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# encoding: utf-8

from __future__ import absolute_import

import collections

import io

import logging

import sys

from optparse import Option

import curtsies

import curtsies.window

import curtsies.input

import curtsies.events

from .curtsiesfrontend.repl import BaseRepl

from .curtsiesfrontend.coderunner import SystemExitFromCodeRunner

from .curtsiesfrontend.interpreter import Interp

from . import args as bpargs

from . import translations

from .translations import _

from .importcompletion import find_iterator

from .curtsiesfrontend import events as bpythonevents

from . import inspection

from .repl import extract_exit_value

logger = logging.getLogger(__name__)

repl = None # global for `from bpython.curtsies import repl`

# WARNING Will be a problem if more than one repl is ever instantiated this way

class FullCurtsiesRepl(BaseRepl):

def __init__(self, config, locals_, banner, interp=None,

paste=None):

self.input_generator = curtsies.input.Input(

keynames='curtsies',

sigint_event=True,

paste_threshold=None)

self.window = curtsies.window.CursorAwareWindow(

sys.stdout,

sys.stdin,

keep_last_line=True,

hide_cursor=False,

extra_bytes_callback=self.input_generator.unget_bytes)

self._request_refresh = self.input_generator.event_trigger(

bpythonevents.RefreshRequestEvent)

self._schedule_refresh = self.input_generator.scheduled_event_trigger(

bpythonevents.ScheduledRefreshRequestEvent)

self._request_reload = self.input_generator.threadsafe_event_trigger(

bpythonevents.ReloadEvent)

self.interrupting_refresh = (self.input_generator

.threadsafe_event_trigger(lambda: None))

self.request_undo = self.input_generator.event_trigger(

bpythonevents.UndoEvent)

with self.input_generator:

pass # temp hack to get .original_stty

BaseRepl.__init__(self,

locals_=locals_,

config=config,

banner=banner,

interp=interp,

orig_tcattrs=self.input_generator.original_stty)

def get_term_hw(self):

return self.window.get_term_hw()

def get_cursor_vertical_diff(self):

return self.window.get_cursor_vertical_diff()

def get_top_usable_line(self):

return self.window.top_usable_row

def on_suspend(self):

self.window.__exit__(None, None, None)

self.input_generator.__exit__(None, None, None)

def after_suspend(self):

self.input_generator.__enter__()

self.window.__enter__()

self.interrupting_refresh()

def process_event_and_paint(self, e):

"""If None is passed in, just paint the screen"""

try:

if e is not None:

self.process_event(e)

except (SystemExitFromCodeRunner, SystemExit) as err:

array, cursor_pos = self.paint(

about_to_exit=True,

user_quit=isinstance(err,

SystemExitFromCodeRunner))

scrolled = self.window.render_to_terminal(array, cursor_pos)

self.scroll_offset += scrolled

raise

else:

array, cursor_pos = self.paint()

scrolled = self.window.render_to_terminal(array, cursor_pos)

self.scroll_offset += scrolled

def mainloop(self, interactive=True, paste=None):

if interactive:

# Add custom help command

# TODO: add methods to run the code

self.initialize_interp()

# run startup file

self.process_event(bpythonevents.RunStartupFileEvent())

# handle paste

if paste:

self.process_event(paste)

# do a display before waiting for first event

self.process_event_and_paint(None)

inputs = combined_events(self.input_generator)

for unused in find_iterator:

e = inputs.send(0)

if e is not None:

self.process_event_and_paint(e)

for e in inputs:

self.process_event_and_paint(e)

def main(args=None, locals_=None, banner=None, welcome_message=None):

"""

banner is displayed directly after the version information.

welcome_message is passed on to Repl and displayed in the statusbar.

"""

translations.init()

config, options, exec_args = bpargs.parse(args, (

'curtsies options', None, [

Option('--log', '-L', action='count',

help=_("log debug messages to bpython.log")),

Option('--paste', '-p', action='store_true',

help=_("start by pasting lines of a file into session")),

]))

if options.log is None:

options.log = 0

logging_levels = [logging.ERROR, logging.INFO, logging.DEBUG]

level = logging_levels[min(len(logging_levels) - 1, options.log)]

logging.getLogger('curtsies').setLevel(level)

logging.getLogger('bpython').setLevel(level)

if options.log:

handler = logging.FileHandler(filename='bpython.log')

logging.getLogger('curtsies').addHandler(handler)

logging.getLogger('curtsies').propagate = False

logging.getLogger('bpython').addHandler(handler)

logging.getLogger('bpython').propagate = False

interp = None

paste = None

if exec_args:

if not options:

raise ValueError("don't pass in exec_args without options")

exit_value = ()

if options.paste:

paste = curtsies.events.PasteEvent()

encoding = inspection.get_encoding_file(exec_args[0])

with io.open(exec_args[0], encoding=encoding) as f:

sourcecode = f.read()

paste.events.extend(sourcecode)

else:

try:

interp = Interp(locals=locals_)

bpargs.exec_code(interp, exec_args)

except SystemExit as e:

exit_value = e.args

if not options.interactive:

return extract_exit_value(exit_value)

else:

# expected for interactive sessions (vanilla python does it)

sys.path.insert(0, '')

if not options.quiet:

print(bpargs.version_banner())

if banner is not None:

print(banner)

global repl

repl = FullCurtsiesRepl(config, locals_, welcome_message, interp, paste)

try:

with repl.input_generator:

with repl.window as win:

with repl:

repl.height, repl.width = win.t.height, win.t.width

exit_value = repl.mainloop()

except (SystemExitFromCodeRunner, SystemExit) as e:

exit_value = e.args

return extract_exit_value(exit_value)

def _combined_events(event_provider, paste_threshold):

"""Combines consecutive keypress events into paste events."""

timeout = yield 'nonsense_event' # so send can be used immediately

queue = collections.deque()

while True:

e = event_provider.send(timeout)

if isinstance(e, curtsies.events.Event):

timeout = yield e

continue

elif e is None:

timeout = yield None

continue

else:

queue.append(e)

e = event_provider.send(0)

while not (e is None or isinstance(e, curtsies.events.Event)):

queue.append(e)

e = event_provider.send(0)

if len(queue) >= paste_threshold:

paste = curtsies.events.PasteEvent()

paste.events.extend(queue)

queue.clear()

timeout = yield paste

else:

while len(queue):

timeout = yield queue.popleft()

def combined_events(event_provider, paste_threshold=3):

g = _combined_events(event_provider, paste_threshold)

next(g)

return g

if __name__ == '__main__':

sys.exit(main())