bpython/bpython/urwid.py at wizard · ata2001/bpython · GitHub

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#!/usr/bin/env python

# The MIT License

# 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.

"""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.

"""

from __future__ import absolute_import, with_statement, division

import sys

import os

import locale

import signal

from types import ModuleType

from optparse import Option

from pygments.token import Token

from bpython import args as bpargs, repl

from bpython.formatter import theme_map

from bpython.importcompletion import find_coroutine

import urwid

py3 = sys.version_info[0] == 3

Parenthesis = Token.Punctuation.Parenthesis

# 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)

class Statusbar(object):

"""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.

"""

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

self.config = config

self.s = s or ''

# XXX wrap in AttrMap for wrapping?

self.widget = urwid.Text(('main', self.s))

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.

"""

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

self._bpy_text = ''

self._bpy_attr = []

self._bpy_selectable = True

self._bpy_may_move_cursor = False

urwid.Edit.__init__(self, *args, **kwargs)

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.

"""

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

# 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 urwid.Edit.get_cursor_coords(self, *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 urwid.Edit.render(self, 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 urwid.Edit.get_pref_col(self, size)

def move_cursor_to_coords(self, *args):

if self._bpy_may_move_cursor:

return urwid.Edit.move_cursor_to_coords(self, *args)

return False

def keypress(self, size, key):

self._bpy_may_move_cursor = True

try:

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

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

return key

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

finally:

self._bpy_may_move_cursor = False

def mouse_event(self, *args):

self._bpy_may_move_cursor = True

try:

return urwid.Edit.mouse_event(self, *args)

finally:

self._bpy_may_move_cursor = False

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):

self.__super.__init__()

self.bottom_w = bottom_w

self.listbox = listbox

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

self.top_w = urwid.LineBox(listbox)

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

# The top window never gets focus.

top_c = self.top_w.render((maxcol, rows))

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 URWIDRepl(repl.Repl):

# XXX this is getting silly, need to split this up somehow

def __init__(self, main_loop, frame, listbox, overlay, tooltip,

interpreter, statusbar, config):

repl.Repl.__init__(self, interpreter, config)

self.main_loop = main_loop

self.frame = frame

self.listbox = listbox

self.overlay = overlay

self.tooltip = tooltip

self.edits = []

self.edit = None

self.statusbar = statusbar

# XXX repl.Repl uses this? What is it?

self.cpos = 0

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

def echo(self, s):

s = s.rstrip('\n')

if s:

text = urwid.Text(('output', s))

if self.edit is None:

self.listbox.body.append(text)

else:

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

# 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)

# TODO: maybe do the redraw after a short delay

# (for performance)

self.main_loop.draw_screen()

def current_line(self):

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

if self.edit is None:

return ''

return self.edit.get_edit_text()

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:]

def _populate_completion(self, main_loop, user_data):

widget_list = self.tooltip.body

widget_list[1] = urwid.Text('')

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

if self.complete():

if self.argspec:

# This is mostly just stolen from the cli module.

func_name, args, is_bound, in_arg = self.argspec

args, varargs, varkw, defaults = args[:4]

if py3:

kwonly, kwonly_defaults = args[4:]

else:

kwonly, kwonly_defaults = [], {}

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 = str(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:

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', kwonly_defaults[arg])])

if varkw:

if args or varargs or kwonly:

markup.append(('punctuation', ', '))

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

markup.append(('punctuation', ')'))

else:

markup = ''

widget_list[0].set_text(markup)

if self.matches:

texts = [urwid.Text(('main', match))

for match in self.matches]

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

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

widget_list[1] = gridflow

self.frame.body = self.overlay

else:

self.frame.body = self.listbox

if self.docstring:

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

docstring = self.docstring

else:

docstring = ''

widget_list[2].set_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 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 repl.Repl.push(self, s, insert_into_history)

except SystemExit:

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):

# Stolen from bpython.cli again

self.push('from bpython._internal import _help as help\n', False)

self.prompt(False)

def keyboard_interrupt(self):

# Do we need to do more here? Break out of multiline input perhaps?

self.echo('KeyboardInterrupt')

def prompt(self, more):

# XXX is this the right place?

self.rl_history.reset()

# XXX what is s_hist?

if not more:

self.edit = BPythonEdit(caption=('prompt', '>>> '))

self.stdout_hist += '>>> '

else:

self.edit = BPythonEdit(caption=('prompt_more', '... '))

self.stdout_hist += '... '

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

# 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)

# Hide the tooltip

self.frame.body = self.listbox

def on_input_change(self, edit, text):

tokens = self.tokenize(text, False)

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

# If we call this synchronously the get_edit_text() in repl.cw

# still returns the old text...

self.main_loop.set_alarm_in(0, self._populate_completion)

def handle_input(self, event):

if event == 'enter':

inp = self.edit.get_edit_text()

self.history.append(inp)

self.edit.make_readonly()

# XXX what is this s_hist thing?

self.stdout_hist += inp + '\n'

self.edit = None

# This may take a while, so force a redraw first:

self.main_loop.draw_screen()

more = self.push(inp)

self.prompt(more)

elif event == 'ctrl d':

# ctrl+d on an empty line exits

if self.edit is not None and not self.edit.get_edit_text():

raise urwid.ExitMainLoop()

elif urwid.command_map[event] == 'cursor up':

# "back" from bpython.cli

self.cpos = 0

self.rl_history.enter(self.edit.get_edit_text())

self.edit.set_edit_text('')

self.edit.insert_text(self.rl_history.back())

elif urwid.command_map[event] == 'cursor down':

# "fwd" from bpython.cli

self.cpos = 0

self.rl_history.enter(self.edit.get_edit_text())

self.edit.set_edit_text('')

self.edit.insert_text(self.rl_history.forward())

#else:

# self.echo(repr(event))

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

# Err, somewhat redundant. There is a call to this buried in urwid.util.

# That seems unfortunate though, so assume that's going away...

locale.setlocale(locale.LC_ALL, '')

# TODO: maybe support displays other than raw_display?

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

'Urwid options', None, [

Option('--reactor', '-r',

help='Run a reactor (see --help-reactors)'),

Option('--help-reactors', action='store_true',

help='List available reactors for -r'),

Option('--server', '-s', type='int',

help='Port to run an eval server on (forces Twisted)'),

]))

if options.help_reactors:

from twisted.application import reactors

# Stolen from twisted.application.app (twistd).

for r in reactors.getReactorTypes():

print ' %-4s\t%s' % (r.shortName, r.description)

return

palette = [

(name, COLORMAP[color.lower()], 'default',

'bold' if color.isupper() else 'default')

for name, color in config.color_scheme.iteritems()]

palette.extend([

('bold ' + name, color + ',bold', background, monochrome)

for name, color, background, monochrome in palette])

if options.server and not options.reactor:

options.reactor = 'select'

if options.reactor:

from twisted.application import reactors

try:

# XXX why does this not just return the reactor it installed?

reactor = reactors.installReactor(options.reactor)

if reactor is None:

from twisted.internet import reactor

except reactors.NoSuchReactor:

sys.stderr.write('Reactor %s does not exist\n' % (

options.reactor,))

return

event_loop = urwid.TwistedEventLoop(reactor)

else:

# None, not urwid.SelectEventLoop(), to work with

# screens that do not support external event loops.

event_loop = None

# TODO: there is also a glib event loop. Do we want that one?

listbox = urwid.ListBox(urwid.SimpleListWalker([]))

# String is straight from bpython.cli

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))

tooltip = urwid.ListBox(urwid.SimpleListWalker([

urwid.Text(''), urwid.Text(''), urwid.Text('')]))

overlay = Tooltip(listbox, tooltip)

frame = urwid.Frame(overlay, footer=statusbar.widget)

# __main__ construction from bpython.cli

if locals_ is None:

main_mod = sys.modules['__main__'] = ModuleType('__main__')

locals_ = main_mod.__dict__

interpreter = repl.Interpreter(locals_, locale.getpreferredencoding())

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

loop = urwid.MainLoop(frame, palette, event_loop=event_loop)

myrepl = URWIDRepl(loop, frame, listbox, overlay, tooltip,

interpreter, statusbar, config)

if options.server:

factory = EvalFactory(myrepl)

reactor.listenTCP(options.server, factory, interface='127.0.0.1')

if options.reactor:

# Twisted sets a sigInt handler that stops the reactor unless

# it sees a different custom signal handler.

def sigint(*args):

reactor.callFromThread(myrepl.keyboard_interrupt)

signal.signal(signal.SIGINT, sigint)

# XXX HACK: circular dependency between the event loop and repl.

# Fix by not using unhandled_input?

loop._unhandled_input = myrepl.handle_input

# Save stdin, stdout and stderr for later restoration

orig_stdin = sys.stdin

orig_stdout = sys.stdout

orig_stderr = sys.stderr

# urwid's screen start() and stop() calls currently hit sys.stdin

# directly (via RealTerminal.tty_signal_keys), so start the screen

# before swapping sys.std*, and swap them back before restoring

# the screen. This also avoids crashes if our redirected sys.std*

# are called before we get around to starting the mainloop

# (urwid raises an exception if we try to draw to the screen

# before starting it).

def run_with_screen_before_mainloop():

try:

# Currently we just set this to None because I do not

# expect code hitting stdin to work. For example: exit()

# (not sys.exit, site.py's exit) tries to close sys.stdin,

# which breaks urwid's shutdown. bpython.cli sets this to

# a fake object that reads input through curses and

# returns it. When using twisted I do not think we can do

# that because sys.stdin.read and friends block, and we

# cannot re-enter the reactor. If using urwid's own

# mainloop we *might* be able to do something similar and

# re-enter its mainloop.

sys.stdin = None #FakeStdin(myrepl)

sys.stdout = myrepl

sys.stderr = myrepl

loop.set_alarm_in(0, start)

while True:

try:

loop.run()

except KeyboardInterrupt:

# HACK: if we run under a twisted mainloop this should

# never happen: we have a SIGINT handler set.

# If we use the urwid select-based loop we just restart

# that loop if interrupted, instead of trying to cook

# up an equivalent to reactor.callFromThread (which

# is what our Twisted sigint handler does)

loop.set_alarm_in(

0, lambda *args: myrepl.keyboard_interrupt())

continue

break

if config.hist_length:

histfilename = os.path.expanduser(config.hist_file)

myrepl.rl_history.save(histfilename,

locale.getpreferredencoding())

finally:

sys.stdin = orig_stdin

sys.stderr = orig_stderr

sys.stdout = orig_stdout

# This needs more thought. What needs to happen inside the mainloop?

def start(main_loop, user_data):

if exec_args:

bpargs.exec_code(interpreter, exec_args)

if not options.interactive:

raise urwid.ExitMainLoop()

if not exec_args:

sys.path.insert(0, '')

# this is CLIRepl.startup inlined.

filename = os.environ.get('PYTHONSTARTUP')

if filename and os.path.isfile(filename):

with open(filename, 'r') as f:

if py3:

interpreter.runsource(f.read(), filename, 'exec')

else:

interpreter.runsource(f.read(), filename, 'exec',

encode=False)

if banner is not None:

repl.write(banner)

repl.write('\n')

myrepl.start()

# This bypasses main_loop.set_alarm_in because we must *not*

# hit the draw_screen call (it's unnecessary and slow).

def run_find_coroutine():

if find_coroutine():

main_loop.event_loop.alarm(0, run_find_coroutine)

run_find_coroutine()

loop.screen.run_wrapper(run_with_screen_before_mainloop)

if config.flush_output and not options.quiet:

sys.stdout.write(myrepl.getstdout())

sys.stdout.flush()

if __name__ == '__main__':

main()

bpython/bpython/urwid.py at wizard · ata2001/bpython · GitHub

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