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cli.py
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#!/usr/bin/env python
#
# The MIT License
#
# Copyright (c) 2008 Bob Farrell
#
# 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.
#
from __future__ import with_statement
import codecs
import os
import sys
import curses
import code
import traceback
import re
import time
import urllib
import rlcompleter
import inspect
import signal
import struct
import termios
import fcntl
import string
import socket
import pydoc
import types
import unicodedata
from cStringIO import StringIO
from locale import LC_ALL, getpreferredencoding, setlocale
from optparse import OptionParser
from urlparse import urljoin
from xmlrpclib import ServerProxy, Error as XMLRPCError
from ConfigParser import ConfigParser, NoSectionError, NoOptionError
# These are used for syntax hilighting.
from pygments import format
from pygments.lexers import PythonLexer
from pygments.token import Token
from bpython.formatter import BPythonFormatter, Parenthesis
# This for import completion
from bpython import importcompletion
from bpython import __version__
def log(x):
f = open('/tmp/bpython.log', 'a')
f.write('%s\n' % (x,))
orig_stdout = sys.__stdout__
stdscr = None
class Struct(object):
"""Simple class for instantiating objects we can add arbitrary attributes
to and use for various arbitrary things."""
pass
class FakeStdin(object):
"""Provide a fake stdin type for things like raw_input() etc."""
def __init__(self, interface):
"""Take the curses Repl on init and assume it provides a get_key method
which, fortunately, it does."""
self.encoding = getpreferredencoding()
self.interface = interface
def readline(self):
"""I can't think of any reason why anything other than readline would
be useful in the context of an interactive interpreter so this is the
only one I've done anything with. The others are just there in case
someone does something weird to stop it from blowing up."""
buffer = ''
while True:
key = self.interface.get_key()
sys.stdout.write(key)
# Include the \n in the buffer - raw_input() seems to deal with trailing
# linebreaks and will break if it gets an empty string.
buffer += key
if key == '\n':
break
return buffer
def read(self, x):
pass
def readlines(self, x):
pass
OPTS = Struct()
DO_RESIZE = False
# TODO:
#
# Tab completion does not work if not at the end of the line.
#
# Numerous optimisations can be made but it seems to do all the lookup stuff
# fast enough on even my crappy server so I'm not too bothered about that
# at the moment.
#
# The popup window that displays the argspecs and completion suggestions
# needs to be an instance of a ListWin class or something so I can wrap
# the addstr stuff to a higher level.
#
def DEBUG(s):
"""This shouldn't ever be called in any release of bpython, so
beat me up if you find anything calling it."""
open('/home/bob/tmp/plonker', 'a').write("%s\n" % (str(s), ))
def make_colours():
"""Init all the colours in curses and bang them into a dictionary"""
OPTS.light = {
'listwin': 'b',
'args': 'g',
'kwvalue': 'b',
'self': 'r',
'*args': 'g',
'**kwargs': 'g',
'punctuation': 'k',
'paren': 'y',
'function': 'r',
'more': 'g',
'prompt': 'r',
'output': 'k',
'statusbar': 'r',
'error': 'b',
}
OPTS.dark = {
'listwin': 'c',
'args': 'g',
'kwvalue': 'b',
'self': 'r',
'*args': 'g',
'**kwargs': 'g',
'punctuation': 'm',
'paren': 'y',
'function': 'r',
'more': 'y',
'prompt': 'g',
'output': 'w',
'statusbar': 'c',
'error': 'y',
}
if OPTS.color_scheme == 'light':
bg = 7
OPTS.extras = OPTS.light
else:
bg = 0
OPTS.extras = OPTS.dark
for i in range(63):
if i > 7:
j = i / 8
else:
j = bg
curses.init_pair(i+1, i % 8, j)
# blacK, Red, Green, Yellow, Blue, Magenta, Cyan, White, Default:
c = {
'k' : 0,
'r' : 1,
'g' : 2,
'y' : 3,
'b' : 4,
'm' : 5,
'c' : 6,
'w' : 7,
'd' : -1,
}
c.update((k, c[v]) for k, v in OPTS.extras.iteritems())
return c
def next_token_inside_string(s, inside_string):
"""Given a code string s and an initial state inside_string, return
whether the next token will be inside a string or not."""
for token, value in PythonLexer().get_tokens(s):
if token is Token.String:
value = value.lstrip('bBrRuU')
if value in ['"""', "'''", '"', "'"]:
if not inside_string:
inside_string = value
elif value == inside_string:
inside_string = False
return inside_string
class Interpreter(code.InteractiveInterpreter):
def __init__(self):
"""The syntaxerror callback can be set at any time and will be called
on a caught syntax error. The purpose for this in bpython is so that
the repl can be instantiated after the interpreter (which it
necessarily must be with the current factoring) and then an exception
callback can be added to the Interpeter instance afterwards - more
specifically, this is so that autoindentation does not occur after a
traceback."""
self.syntaxerror_callback = None
# Unfortunately code.InteractiveInterpreter is a classic class, so no super()
code.InteractiveInterpreter.__init__(self)
def showsyntaxerror(self, filename=None):
"""Override the regular handler, the code's copied and pasted from
code.py, as per showtraceback, but with the syntaxerror callback called
and the text in a pretty colour."""
if self.syntaxerror_callback is not None:
self.syntaxerror_callback()
type, value, sys.last_traceback = sys.exc_info()
sys.last_type = type
sys.last_value = value
if filename and type is SyntaxError:
# Work hard to stuff the correct filename in the exception
try:
msg, (dummy_filename, lineno, offset, line) = value
except:
# Not the format we expect; leave it alone
pass
else:
# Stuff in the right filename
value = SyntaxError(msg, (filename, lineno, offset, line))
sys.last_value = value
list = traceback.format_exception_only(type, value)
self.writetb(list)
def showtraceback(self):
"""This needs to override the default traceback thing
so it can put it into a pretty colour and maybe other
stuff, I don't know"""
try:
t, v, tb = sys.exc_info()
sys.last_type = t
sys.last_value = v
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
l = traceback.format_list(tblist)
if l:
l.insert(0, "Traceback (most recent call last):\n")
l[len(l):] = traceback.format_exception_only(t, v)
finally:
tblist = tb = None
self.writetb(l)
def writetb(self, l):
"""This outputs the traceback and should be overridden for anything
fancy."""
map(self.write, ["\x01%s\x03%s" % (OPTS.extras['error'], i) for i in l])
class Repl(object):
"""Implements the necessary guff for a Python-repl-alike interface
The execution of the code entered and all that stuff was taken from the
Python code module, I had to copy it instead of inheriting it, I can't
remember why. The rest of the stuff is basically what makes it fancy.
It reads what you type, passes it to a lexer and highlighter which
returns a formatted string. This then gets passed to echo() which
parses that string and prints to the curses screen in appropriate
colours and/or bold attribute.
The Repl class also keeps two stacks of lines that the user has typed in:
One to be used for the undo feature. I am not happy with the way this
works. The only way I have been able to think of is to keep the code
that's been typed in in memory and re-evaluate it in its entirety for each
"undo" operation. Obviously this means some operations could be extremely
slow. I'm not even by any means certain that this truly represents a
genuine "undo" implementation, but it does seem to be generally pretty
effective.
If anyone has any suggestions for how this could be improved, I'd be happy
to hear them and implement it/accept a patch. I researched a bit into the
idea of keeping the entire Python state in memory, but this really seems
very difficult (I believe it may actually be impossible to work) and has
its own problems too.
The other stack is for keeping a history for pressing the up/down keys
to go back and forth between lines.
"""#TODO: Split the class up a bit so the curses stuff isn't so integrated.
"""
"""
def __init__(self, scr, interp, statusbar=None, idle=None):
"""Initialise the repl with, unfortunately, a curses screen passed to
it. This needs to be split up so the curses crap isn't in here.
interp is a Python code.InteractiveInterpreter instance
The optional 'idle' parameter is a function that the repl call while
it's blocking (waiting for keypresses). This, again, should be in a
different class"""
self.cut_buffer = ''
self.buffer = []
self.scr = scr
self.interp = interp
self.match = False
self.rl_hist = []
self.stdout_hist = ''
self.s_hist = []
self.history = []
self.h_i = 0
self.in_hist = False
self.evaluating = False
self.do_exit = False
self.cpos = 0
# Use the interpreter's namespace only for the readline stuff:
self.completer = rlcompleter.Completer(self.interp.locals)
self.completer.attr_matches = self.attr_matches
# Gna, Py 2.6's rlcompleter searches for __call__ inside the
# instance instead of the type, so we monkeypatch to prevent
# side-effects (__getattr__/__getattribute__)
self.completer._callable_postfix = self._callable_postfix
self.statusbar = statusbar
self.list_win = newwin(1, 1, 1, 1)
self.idle = idle
self.f_string = ''
self.matches = []
self.argspec = None
self.s = ''
self.inside_string = False
self.highlighted_paren = None
self.list_win_visible = False
self._C = {}
sys.stdin = FakeStdin(self)
sys.path.insert(0, '.')
if not OPTS.arg_spec:
return
pythonhist = os.path.expanduser('~/.pythonhist')
if os.path.exists(pythonhist):
with codecs.open(pythonhist, 'r', getpreferredencoding(),
'ignore') as hfile:
self.rl_hist = hfile.readlines()
def clean_object(self, obj):
"""Try to make an object not exhibit side-effects on attribute
lookup. Return the type's magic attributes so they can be reapplied
with restore_object"""
type_ = type(obj)
__getattribute__ = None
__getattr__ = None
# Dark magic:
# If __getattribute__ doesn't exist on the class and __getattr__ does
# then __getattr__ will be called when doing
# getattr(type_, '__getattribute__', None)
# so we need to first remove the __getattr__, then the
# __getattribute__, then look up the attributes and then restore the
# original methods. :-(
# The upshot being that introspecting on an object to display its
# attributes will avoid unwanted side-effects.
if type_ != types.InstanceType:
__getattr__ = getattr(type_, '__getattr__', None)
if __getattr__ is not None:
try:
setattr(type_, '__getattr__', (lambda _: None))
except TypeError:
__getattr__ = None
__getattribute__ = getattr(type_, '__getattribute__', None)
if __getattribute__ is not None:
try:
setattr(type_, '__getattribute__', object.__getattribute__)
except TypeError:
# XXX: This happens for e.g. built-in types
__getattribute__ = None
# /Dark magic
return __getattribute__, __getattr__
def restore_object(self, obj, attribs):
"""Restore an object's magic methods as returned from clean_object"""
type_ = type(obj)
__getattribute__, __getattr__ = attribs
# Dark magic:
if __getattribute__ is not None:
setattr(type_, '__getattribute__', __getattribute__)
if __getattr__ is not None:
setattr(type_, '__getattr__', __getattr__)
# /Dark magic
def attr_matches(self, text):
"""Taken from rlcompleter.py and bent to my will."""
m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
if not m:
return []
expr, attr = m.group(1, 3)
obj = eval(expr, self.interp.locals)
attribs = self.clean_object(obj)
try:
matches = self.attr_lookup(obj, expr, attr)
finally:
self.restore_object(obj, attribs)
return matches
def attr_lookup(self, obj, expr, attr):
"""Second half of original attr_matches method factored out so it can
be wrapped in a safe try/finally block in case anything bad happens to
restore the original __getattribute__ method."""
words = dir(obj)
if hasattr(obj, '__class__'):
words.append('__class__')
words = words + rlcompleter.get_class_members(obj.__class__)
matches = []
n = len(attr)
for word in words:
if word[:n] == attr and word != "__builtins__":
matches.append("%s.%s" % (expr, word))
return matches
def _callable_postfix(self, value, word):
"""rlcompleter's _callable_postfix done right."""
attribs = self.clean_object(value)
try:
if hasattr(value, '__call__'):
word += '('
finally:
self.restore_object(value, attribs)
return word
def cw(self):
"""Return the current word, i.e. the (incomplete) word directly to the
left of the cursor"""
if self.cpos:
# I don't know if autocomplete should be disabled if the cursor
# isn't at the end of the line, but that's what this does for now.
return
l = len(self.s)
if (not self.s or
(not self.s[l-1].isalnum() and
self.s[l-1] not in ('.', '_'))):
return
i = 1
while i < l+1:
if not self.s[-i].isalnum() and self.s[-i] not in ('.', '_'):
break
i += 1
return self.s[-i +1:]
def get_args(self):
"""Check if an unclosed parenthesis exists, then attempt to get the
argspec() for it. On success, update self.argspec and return True,
otherwise set self.argspec to None and return False"""
def getpydocspec(f, func):
try:
argspec = pydoc.getdoc(f)
except NameError:
return None
rx = re.compile(r'([a-zA-Z_][a-zA-Z0-9_]*?)\((.*?)\)')
s = rx.search(argspec)
if s is None:
return None
if s.groups()[0] != func:
return None
args = [i.strip() for i in s.groups()[1].split(',')]
return [func, (args, None, None, None)]
def getargspec(func):
try:
if func in self.interp.locals:
f = self.interp.locals[func]
except TypeError:
return None
else:
try:
f = eval(func, self.interp.locals)
except Exception:
# Same deal with the exceptions :(
return None
try:
if inspect.isclass(f):
argspec = inspect.getargspec(f.__init__)
else:
argspec = inspect.getargspec(f)
self.argspec = [func, argspec]
return True
except (NameError, TypeError, KeyError):
t = getpydocspec(f, func)
if t is None:
return None
self.argspec = t
return True
except AttributeError:
# This happens if no __init__ is found
return None
if not OPTS.arg_spec:
return False
stack = ['']
try:
for (token, value) in PythonLexer().get_tokens(self.s):
if token is Token.Punctuation:
if value == '(':
stack.append('')
elif value == ')':
stack.pop()
elif (token is Token.Name or token in Token.Name.subtypes or
token is Token.Operatir and value == '.'):
stack[-1] += value
else:
stack[-1] = ''
func = stack.pop() or stack.pop()
except IndexError:
return False
return getargspec(func)
def complete(self, tab=False):
"""Wrap the _complete method to determine the visibility of list_win
since there can be several reasons why it won't be displayed; this
makes it more manageable."""
if self.list_win_visible and not OPTS.auto_display_list:
self.scr.touchwin()
self.list_win_visible = False
return
if OPTS.auto_display_list or tab:
self.list_win_visible = self._complete(tab)
return
def _complete(self, unused_tab=False):
"""Construct a full list of possible completions and construct and
display them in a window. Also check if there's an available argspec
(via the inspect module) and bang that on top of the completions too.
The return value is whether the list_win is visible or not."""
if not self.get_args():
self.argspec = None
cw = self.cw()
if not (cw or self.argspec):
self.scr.redrawwin()
self.scr.refresh()
return False
if not cw:
self.matches = []
# Check for import completion
e = False
matches = importcompletion.complete(self.s, cw)
if matches is None:
self.scr.redrawwin()
return False
if not matches:
# Nope, no import, continue with normal completion
try:
self.completer.complete(cw, 0)
except Exception:
# This sucks, but it's either that or list all the exceptions that could
# possibly be raised here, so if anyone wants to do that, feel free to send me
# a patch. XXX: Make sure you raise here if you're debugging the completion
# stuff !
e = True
else:
matches = self.completer.matches
if e or not matches:
self.matches = []
if not self.argspec:
self.scr.redrawwin()
return False
if not e and matches:
# remove duplicates and restore order
self.matches = sorted(set(matches))
if len(self.matches) == 1 and not OPTS.auto_display_list:
self.list_win_visible = True
self.tab()
return False
self.show_list(self.matches, self.argspec)
return True
def show_list(self, items, topline=None):
shared = Struct()
shared.cols = 0
shared.rows = 0
shared.wl = 0
y, x = self.scr.getyx()
h, w = self.scr.getmaxyx()
down = (y < h / 2)
if down:
max_h = h - y
else:
max_h = y+1
max_w = int(w * 0.8)
self.list_win.erase()
if items and '.' in items[0]:
items = [x.rsplit('.')[-1] for x in items]
if topline:
height_offset = self.mkargspec(topline, down) + 1
else:
height_offset = 0
def lsize():
wl = max(len(i) for i in v_items) + 1
if not wl:
wl = 1
cols = ((max_w - 2) / wl) or 1
rows = len(v_items) / cols
if cols * rows < len(v_items):
rows += 1
if rows + 2 >= max_h:
rows = max_h - 2
return False
shared.rows = rows
shared.cols = cols
shared.wl = wl
return True
if items:
# visible items (we'll append until we can't fit any more in)
v_items = [items[0][:max_w-3]]
lsize()
else:
v_items = []
for i in items[1:]:
v_items.append(i[:max_w-3])
if not lsize():
del v_items[-1]
v_items[-1] = '...'
break
rows = shared.rows
if rows + height_offset < max_h:
rows += height_offset
display_rows = rows
else:
display_rows = rows + height_offset
cols = shared.cols
wl = shared.wl
if topline and not v_items:
w = max_w
elif wl + 3 > max_w:
w = max_w
else:
t = (cols + 1) * wl + 3
if t > max_w:
t = max_w
w = t
if height_offset and display_rows+5 >= max_h:
del v_items[-(cols * (height_offset)):]
self.list_win.resize(rows+2, w)
if down:
self.list_win.mvwin(y+1, 0)
else:
self.list_win.mvwin(y-rows-2, 0)
if v_items:
self.list_win.addstr('\n ')
for ix, i in enumerate(v_items):
padding = (wl - len(i)) * ' '
self.list_win.addstr(
i + padding,
curses.color_pair(self._C["listwin"]+1))
if ((cols == 1 or (ix and not (ix+1) % cols))
and ix + 1 < len(v_items)):
self.list_win.addstr('\n ')
# XXX: After all the trouble I had with sizing the list box (I'm not very good
# at that type of thing) I decided to do this bit of tidying up here just to
# make sure there's no unnececessary blank lines, it makes things look nicer.
y = self.list_win.getyx()[0]
self.list_win.resize(y + 2, w)
self.statusbar.win.touchwin()
self.statusbar.win.noutrefresh()
self.list_win.border()
self.scr.touchwin()
self.scr.cursyncup()
self.scr.noutrefresh()
# This looks a little odd, but I can't figure a better way to stick the cursor
# back where it belongs (refreshing the window hides the list_win)
self.scr.move(*self.scr.getyx())
self.list_win.refresh()
def mkargspec(self, topline, down):
"""This figures out what to do with the argspec and puts it nicely into
the list window. It returns the number of lines used to display the
argspec. It's also kind of messy due to it having to call so many
addstr() to get the colouring right, but it seems to be pretty
sturdy."""
r = 3
fn = topline[0]
args = topline[1][0]
kwargs = topline[1][3]
_args = topline[1][1]
_kwargs = topline[1][2]
max_w = int(self.scr.getmaxyx()[1] * 0.6)
self.list_win.erase()
self.list_win.resize(3, max_w)
h, w = self.list_win.getmaxyx()
self.list_win.addstr('\n ')
self.list_win.addstr(fn,
curses.color_pair(self._C["function"]+1) | curses.A_BOLD)
self.list_win.addstr(': (', curses.color_pair(self._C["paren"]+1))
maxh = self.scr.getmaxyx()[0]
for k, i in enumerate(args):
y, x = self.list_win.getyx()
ln = len(str(i))
kw = None
if kwargs and k+1 > len(args) - len(kwargs):
kw = str(kwargs[k - (len(args) - len(kwargs))])
ln += len(kw) + 1
if ln + x >= w:
ty = self.list_win.getbegyx()[0]
if not down and ty > 0:
h +=1
self.list_win.mvwin(ty-1, 1)
self.list_win.resize(h, w)
elif down and h + r < maxh-ty:
h += 1
self.list_win.resize(h, w)
else:
break
r += 1
self.list_win.addstr('\n\t')
if str(i) == 'self' and k == 0:
color = self._C["self"]
else:
color = self._C["args"]
self.list_win.addstr(str(i),
curses.color_pair(color + 1) | curses.A_BOLD)
if kw:
self.list_win.addstr('=',
curses.color_pair(self._C["punctuation"]+1))
self.list_win.addstr(kw, curses.color_pair(self._C["kwvalue"]+1))
if k != len(args) -1:
self.list_win.addstr(', ',
curses.color_pair(self._C["punctuation"]+1))
if _args:
if args:
self.list_win.addstr(', ',
curses.color_pair(self._C["args"]+1))
self.list_win.addstr('*%s' % (_args, ),
curses.color_pair(self._C["*args"]+1))
if _kwargs:
if args or _args:
self.list_win.addstr(', ',
curses.color_pair(self._C["punctuation"]+1))
self.list_win.addstr('**%s' % (_kwargs, ),
curses.color_pair(self._C["**kwargs"]+1))
self.list_win.addstr(')', curses.color_pair(self._C["paren"]+1))
return r
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 formatforfile(self, s):
"""Format the stdout buffer to something suitable for writing to disk,
i.e. without >>> and ... at input lines and with "# OUT: " prepended to
output lines."""
def process():
for line in s.split('\n'):
if line.startswith('>>>') or line.startswith('...'):
yield line[4:]
elif line.rstrip():
yield "# OUT: %s" % (line,)
return "\n".join(process())
def write2file(self):
"""Prompt for a filename and write the current contents of the stdout
buffer to disk."""
fn = self.statusbar.prompt('Save to file: ')
if fn.startswith('~'):
fn = os.path.expanduser(fn)
s = self.formatforfile(self.getstdout())
try:
f = open(fn, 'w')
f.write(s)
f.close()
except IOError:
self.statusbar.message("Disk write error for file '%s'." % (fn, ))
else:
self.statusbar.message('Saved to %s' % (fn, ))
def pastebin(self):
"""Upload to a pastebin and display the URL in the status bar."""
pasteservice_url = 'http://paste.pocoo.org/'
pasteservice = ServerProxy(urljoin(pasteservice_url, '/xmlrpc/'))
s = self.getstdout()
self.statusbar.message('Posting data to pastebin...')
try:
paste_id = pasteservice.pastes.newPaste('pycon', s)
except XMLRPCError, e:
self.statusbar.message( 'Upload failed: %s' % (str(e), ) )
return
paste_url = urljoin(pasteservice_url, '/show/%s/' % (paste_id, ))
self.statusbar.message('Pastebin URL: %s' % (paste_url, ), 10)
def make_list(self, items):
"""Compile a list of items. At the moment this simply returns
the list; it's here in case I decide to add any more functionality.
I originally had this method return a list of items where each item
was prepended with a number/letter so the user could choose an option
but it doesn't seem appropriate for readline-like behaviour."""
return items
def push(self, s):
"""Push a line of code onto the buffer so it can process it all
at once when a code block ends"""
s = s.rstrip('\n')
self.buffer.append(s)
try:
encoding = getpreferredencoding()
source = '# coding: %s\n' % (encoding, )
source += '\n'.join(self.buffer).encode(encoding)
more = self.interp.runsource(source)
except SystemExit:
# Avoid a traceback on e.g. quit()
self.do_exit = True
return False
if not more:
self.buffer = []
return more
def undo(self, n=1):
"""Go back in the undo history n steps and call reeavluate()
Note that in the program this is called "Rewind" because I
want it to be clear that this is by no means a true undo
implementation, it is merely a convenience bonus."""
if not self.history:
return None
if len(self.history) < n:
n = len(self.history)
self.history = self.history[:-n]
self.reevaluate()
def enter_hist(self):
"""Set flags for entering into the history by pressing up/down"""
if not self.in_hist:
self.in_hist = True
self.ts = self.s
def back(self):
"""Replace the active line with previous line in history and
increment the index to keep track"""
if not self.rl_hist:
return None
self.cpos = 0
self.enter_hist()
if self.h_i < len(self.rl_hist):
self.h_i += 1
self.s = self.rl_hist[-self.h_i].rstrip('\n')
self.print_line(self.s, clr=True)
def fwd(self):
"""Same as back() but, well, forward"""
self.enter_hist()
self.cpos = 0
if self.h_i > 1:
self.h_i -= 1
self.s = self.rl_hist[-self.h_i].rstrip('\n')
else:
self.h_i = 0
self.s = self.ts
self.ts = ''
self.in_hist = False
self.print_line(self.s, clr=True)
def redraw(self):
"""Redraw the screen."""
self.scr.erase()
for k, s in enumerate(self.s_hist):
if not s:
continue
self.iy, self.ix = self.scr.getyx()
for i in s.split('\x04'):
self.echo(i, redraw=False)
if k < len(self.s_hist) -1:
self.scr.addstr('\n')
self.iy, self.ix = self.scr.getyx()
self.print_line(self.s)
self.scr.refresh()
self.statusbar.refresh()
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()
self.s_hist = []
self.prompt(False)
self.iy, self.ix = self.scr.getyx()
for line in self.history:
self.stdout_hist += line.encode(getpreferredencoding()) + '\n'
self.print_line(line)
self.s_hist[-1] += self.f_string
# 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()