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from __future__ import absolute_import

import code

import io

import logging

import sys

from optparse import Option

import curtsies

import curtsies.window

import curtsies.input

import curtsies.events

from bpython.curtsiesfrontend.repl import Repl

from bpython.curtsiesfrontend.coderunner import SystemExitFromCodeGreenlet

from bpython import args as bpargs

from bpython import translations

from bpython.translations import _

from bpython.importcompletion import find_iterator

from bpython.curtsiesfrontend import events as bpythonevents

from bpython import inspection

from bpython.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

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

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 = code.InteractiveInterpreter(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, '')

print(bpargs.version_banner())

try:

exit_value = mainloop(config, locals_, banner, interp, paste,

interactive=(not exec_args))

except (SystemExitFromCodeGreenlet, SystemExit) as e:

exit_value = e.args

return extract_exit_value(exit_value)

def mainloop(config, locals_, banner, interp=None, paste=None,

interactive=True):

with curtsies.input.Input(keynames='curtsies', sigint_event=True) as \

input_generator:

with curtsies.window.CursorAwareWindow(

sys.stdout,

sys.stdin,

keep_last_line=True,

hide_cursor=False,

extra_bytes_callback=input_generator.unget_bytes) as window:

request_refresh = input_generator.event_trigger(

bpythonevents.RefreshRequestEvent)

schedule_refresh = input_generator.scheduled_event_trigger(

bpythonevents.ScheduledRefreshRequestEvent)

request_reload = input_generator.threadsafe_event_trigger(

bpythonevents.ReloadEvent)

interrupting_refresh = input_generator.threadsafe_event_trigger(

lambda: None)

request_undo = input_generator.event_trigger(

bpythonevents.UndoEvent)

def on_suspend():

window.__exit__(None, None, None)

input_generator.__exit__(None, None, None)

def after_suspend():

input_generator.__enter__()

window.__enter__()

interrupting_refresh()

# global for easy introspection `from bpython.curtsies import repl`

global repl

with Repl(config=config,

locals_=locals_,

request_refresh=request_refresh,

schedule_refresh=schedule_refresh,

request_reload=request_reload,

request_undo=request_undo,

get_term_hw=window.get_term_hw,

get_cursor_vertical_diff=window.get_cursor_vertical_diff,

banner=banner,

interp=interp,

interactive=interactive,

orig_tcattrs=input_generator.original_stty,

on_suspend=on_suspend,

after_suspend=after_suspend) as repl:

repl.height, repl.width = window.t.height, window.t.width

def process_event(e):

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

try:

if e is not None:

repl.process_event(e)

except (SystemExitFromCodeGreenlet, SystemExit) as err:

array, cursor_pos = repl.paint(

about_to_exit=True,

user_quit=isinstance(err,

SystemExitFromCodeGreenlet))

scrolled = window.render_to_terminal(array, cursor_pos)

repl.scroll_offset += scrolled

raise

else:

array, cursor_pos = repl.paint()

scrolled = window.render_to_terminal(array, cursor_pos)

repl.scroll_offset += scrolled

if interactive:

# Add custom help command

# TODO: add methods to run the code

repl.coderunner.interp.locals['_repl'] = repl

repl.coderunner.interp.runsource(

'from bpython.curtsiesfrontend._internal '

'import _Helper')

repl.coderunner.interp.runsource('help = _Helper(_repl)\n')

del repl.coderunner.interp.locals['_repl']

del repl.coderunner.interp.locals['_Helper']

# run startup file

process_event(bpythonevents.RunStartupFileEvent())

# handle paste

if paste:

process_event(paste)

# do a display before waiting for first event

process_event(None)

for unused in find_iterator:

e = input_generator.send(0)

if e is not None:

process_event(e)

for e in input_generator:

process_event(e)

if __name__ == '__main__':

sys.exit(main())