# -*- coding: utf-8 -*-
# *****************************************************************************
#       Copyright (C) 2003-2006 Gary Bishop.
#       Copyright (C) 2006-2020 Michael Graz. <mgraz@plan10.com>
#       Copyright (C) 2006-2020 Jorgen Stenarson. <jorgen.stenarson@bostream.nu>
#       Copyright (C) 2020 Bassem Girgis. <brgirgis@gmail.com>
#
#  Distributed under the terms of the BSD License.  The full license is in
#  the file COPYING, distributed as part of this software.
# *****************************************************************************
from __future__ import absolute_import, print_function, unicode_literals

import os

import pyreadline3.lineeditor.history as history
import pyreadline3.lineeditor.lineobj as lineobj
import pyreadline3.logger as logger
from pyreadline3.logger import log

from . import basemode


class ViMode(basemode.BaseMode):
    mode = "vi"

    def __init__(self, rlobj):
        super(ViMode, self).__init__(rlobj)
        self.__vi_insert_mode = None

    def __repr__(self):
        return "<ViMode>"

    def process_keyevent(self, keyinfo):
        def nop(e):
            pass
        keytuple = keyinfo.tuple()

        # Process exit keys. Only exit on empty line
        if keytuple in self.exit_dispatch:
            if lineobj.EndOfLine(self.l_buffer) == 0:
                raise EOFError

        dispatch_func = self.key_dispatch.get(keytuple, self.vi_key)
        log("readline from keyboard:%s->%s" % (keytuple, dispatch_func))
        r = None
        if dispatch_func:
            r = dispatch_func(keyinfo)
            self.l_buffer.push_undo()

        self.previous_func = dispatch_func
        if r:
            self._update_line()
            return True
        return False

    # Methods below here are bindable emacs functions

    def init_editing_mode(self, e):  # (M-C-j)
        '''Initialize vi editingmode'''
        self.show_all_if_ambiguous = 'on'
        self.key_dispatch = {}
        self.__vi_insert_mode = None
        self._vi_command = None
        self._vi_command_edit = None
        self._vi_key_find_char = None
        self._vi_key_find_direction = True
        self._vi_yank_buffer = None
        self._vi_multiplier1 = ''
        self._vi_multiplier2 = ''
        self._vi_undo_stack = []
        self._vi_undo_cursor = -1
        self._vi_current = None
        self._vi_search_text = ''
        self._vi_search_position = 0
        self.vi_save_line()
        self.vi_set_insert_mode(True)
        # make ' ' to ~ self insert
        for c in range(ord(' '), 127):
            self._bind_key('%s' % chr(c), self.vi_key)
        self._bind_key('BackSpace', self.vi_backspace)
        self._bind_key('Escape', self.vi_escape)
        self._bind_key('Return', self.vi_accept_line)

        self._bind_key('Left', self.backward_char)
        self._bind_key('Right', self.forward_char)
        self._bind_key('Home', self.beginning_of_line)
        self._bind_key('End', self.end_of_line)
        self._bind_key('Delete', self.delete_char)

        self._bind_key('Control-d', self.vi_eof)
        self._bind_key('Control-z', self.vi_eof)
        self._bind_key('Control-r', self.vi_redo)
        self._bind_key('Up', self.vi_arrow_up)
        self._bind_key('Control-p', self.vi_up)
        self._bind_key('Down', self.vi_arrow_down)
        self._bind_key('Control-n', self.vi_down)
        self._bind_key('Tab', self.vi_complete)
#        self._bind_key('Control-e', self.emacs)

    def vi_key(self, e):
        if not self._vi_command:
            self._vi_command = ViCommand(self)
        elif self._vi_command.is_end:
            if self._vi_command.is_edit:
                self._vi_command_edit = self._vi_command
            self._vi_command = ViCommand(self)
        self._vi_command.add_char(e.char)

    def vi_error(self):
        self._bell()

    def vi_get_is_insert_mode(self):
        return self.__vi_insert_mode
    vi_is_insert_mode = property(vi_get_is_insert_mode)

    def vi_escape(self, e):
        if self.vi_is_insert_mode:
            if self._vi_command:
                self._vi_command.add_char(e.char)
            else:
                self._vi_command = ViCommand(self)
            self.vi_set_insert_mode(False)
            self.l_buffer.point = lineobj.PrevChar
        elif self._vi_command and self._vi_command.is_replace_one:
            self._vi_command.add_char(e.char)
        else:
            self.vi_error()

    def vi_backspace(self, e):
        if self._vi_command:
            self._vi_command.add_char(e.char)
        else:
            self._vi_do_backspace(self._vi_command)

    def _vi_do_backspace(self, vi_cmd):
        if self.vi_is_insert_mode or (
                self._vi_command and self._vi_command.is_search):
            if self.l_buffer.point > 0:
                self.l_buffer.point -= 1
                if self.l_buffer.overwrite:
                    try:
                        prev = self._vi_undo_stack[self._vi_undo_cursor][1][self.l_buffer.point]
                        self.l_buffer.line_buffer[self.l_buffer.point] = prev
                    except IndexError:
                        del self.l_buffer.line_buffer[self.l_buffer.point]
                else:
                    self.vi_save_line()
                    del self.l_buffer.line_buffer[self.l_buffer.point]

    def vi_accept_line(self, e):
        if self._vi_command and self._vi_command.is_search:
            self._vi_command.do_search()
            return False
        self._vi_command = None
        self.vi_set_insert_mode(True)
        self._vi_undo_stack = []
        self._vi_undo_cursor = -1
        self._vi_current = None
        if self.l_buffer.line_buffer:
            self.add_history(self.l_buffer.copy())
        return self.accept_line(e)

    def vi_eof(self, e):
        raise EOFError

    def vi_set_insert_mode(self, value):
        if self.__vi_insert_mode == value:
            return
        self.__vi_insert_mode = value
        if value:
            self.vi_save_line()
            self.cursor_size = 25
        else:
            self.cursor_size = 100

    def vi_undo_restart(self):
        tpl_undo = (self.l_buffer.point, self.l_buffer.line_buffer[:], )
        self._vi_undo_stack = [tpl_undo]
        self._vi_undo_cursor = 0

    def vi_save_line(self):
        if self._vi_undo_stack and self._vi_undo_cursor >= 0:
            del self._vi_undo_stack[self._vi_undo_cursor + 1:]
        # tpl_undo = (self.l_buffer.point, self.l_buffer[:], )
        tpl_undo = (self.l_buffer.point, self.l_buffer.line_buffer[:], )
        if not self._vi_undo_stack or self._vi_undo_stack[self._vi_undo_cursor][1] != tpl_undo[1]:
            self._vi_undo_stack.append(tpl_undo)
            self._vi_undo_cursor += 1

    def vi_undo_prepare(self):
        if self._vi_undo_cursor == len(self._vi_undo_stack) - 1:
            self.vi_save_line()

    def vi_undo(self, do_pop=True):
        self.vi_undo_prepare()
        if not self._vi_undo_stack or self._vi_undo_cursor <= 0:
            self.vi_error()
            return
        self._vi_undo_cursor -= 1
        self.vi_undo_assign()

    def vi_undo_all(self):
        self.vi_undo_prepare()
        if self._vi_undo_cursor > 0:
            self._vi_undo_cursor = 0
            self.vi_undo_assign()
        else:
            self.vi_error()

    def vi_undo_assign(self):
        tpl_undo = self._vi_undo_stack[self._vi_undo_cursor]
        self.l_buffer.line_buffer = tpl_undo[1][:]
        self.l_buffer.point = tpl_undo[0]

    def vi_redo(self, e):
        if self._vi_undo_cursor >= len(self._vi_undo_stack) - 1:
            self.vi_error()
            return
        self._vi_undo_cursor += 1
        self.vi_undo_assign()

    def vi_search(self, rng):
        for i in rng:
            line_history = self._history.history[i]
            pos = line_history.get_line_text().find(self._vi_search_text)
            if pos >= 0:
                self._vi_search_position = i
                self._history.history_cursor = i
                self.l_buffer.line_buffer = list(line_history.line_buffer)
                self.l_buffer.point = pos
                self.vi_undo_restart()
                return True
        self._bell()
        return False

    def vi_search_first(self):
        text = ''.join(self.l_buffer.line_buffer[1:])
        if text:
            self._vi_search_text = text
            self._vi_search_position = len(self._history.history) - 1
        elif self._vi_search_text:
            self._vi_search_position -= 1
        else:
            self.vi_error()
            self.vi_undo()
            return
        if not self.vi_search(list(range(self._vi_search_position, -1, -1))):
            # Here: search text not found
            self.vi_undo()

    def vi_search_again_backward(self):
        self.vi_search(list(range(self._vi_search_position - 1, -1, -1)))

    def vi_search_again_forward(self):
        self.vi_search(
            list(range(self._vi_search_position + 1, len(self._history.history))))

    def vi_up(self, e):
        if self._history.history_cursor == len(self._history.history):
            self._vi_current = self.l_buffer.line_buffer[:]
        # self._history.previous_history (e)
        self._history.previous_history(self.l_buffer)
        if self.vi_is_insert_mode:
            self.end_of_line(e)
        else:
            self.beginning_of_line(e)
        self.vi_undo_restart()

    def vi_down(self, e):
        if self._history.history_cursor >= len(self._history.history):
            self.vi_error()
            return
        if self._history.history_cursor < len(self._history.history) - 1:
            # self._history.next_history (e)
            self._history.next_history(self.l_buffer)
            if self.vi_is_insert_mode:
                self.end_of_line(e)
            else:
                self.beginning_of_line(e)
            self.vi_undo_restart()
        elif self._vi_current is not None:
            self._history.history_cursor = len(self._history.history)
            self.l_buffer.line_buffer = self._vi_current
            self.end_of_line(e)
            if not self.vi_is_insert_mode and self.l_buffer.point > 0:
                self.l_buffer.point -= 1
            self._vi_current = None
        else:
            self.vi_error()
            return

    def vi_arrow_up(self, e):
        self.vi_set_insert_mode(True)
        self.vi_up(e)
        self.vi_save_line()

    def vi_arrow_down(self, e):
        self.vi_set_insert_mode(True)
        self.vi_down(e)
        self.vi_save_line()

    def vi_complete(self, e):
        text = self.l_buffer.get_line_text()
        if text and not text.isspace():
            return self.complete(e)
        else:
            return self.vi_key(e)


# vi input states
# sequence of possible states are in the order below
_VI_BEGIN = 'vi_begin'
_VI_MULTI1 = 'vi_multi1'
_VI_ACTION = 'vi_action'
_VI_MULTI2 = 'vi_multi2'
_VI_MOTION = 'vi_motion'
_VI_MOTION_ARGUMENT = 'vi_motion_argument'
_VI_REPLACE_ONE = 'vi_replace_one'
_VI_TEXT = 'vi_text'
_VI_SEARCH = 'vi_search'
_VI_END = 'vi_end'

# vi helper class


class ViCommand:
    def __init__(self, readline):
        self.readline = readline
        self.lst_char = []
        self.state = _VI_BEGIN
        self.action = self.movement
        self.motion = None
        self.motion_argument = None
        self.text = None
        self.pos_motion = None
        self.is_edit = False
        self.is_overwrite = False
        self.is_error = False
        self.is_star = False
        self.delete_left = 0
        self.delete_right = 0
        self.readline._vi_multiplier1 = ''
        self.readline._vi_multiplier2 = ''
        self.set_override_multiplier(0)
        self.skip_multipler = False
        self.tabstop = 4
        self.dct_fcn = {
            ord('$'): self.key_dollar,
            ord('^'): self.key_hat,
            ord(';'): self.key_semicolon,
            ord(','): self.key_comma,
            ord('%'): self.key_percent,
            ord('.'): self.key_dot,
            ord('/'): self.key_slash,
            ord('*'): self.key_star,
            ord('|'): self.key_bar,
            ord('~'): self.key_tilde,
            8: self.key_backspace,
        }

    def add_char(self, char):
        self.lst_char.append(char)
        if self.state == _VI_BEGIN and self.readline.vi_is_insert_mode:
            self.readline.vi_save_line()
            self.state = _VI_TEXT
        if self.state == _VI_SEARCH:
            if char == '\x08':  # backspace
                self.key_backspace(char)
            else:
                self.set_text(char)
            return
        if self.state == _VI_TEXT:
            if char == '\x1b':  # escape
                self.escape(char)
            elif char == '\x09':  # tab
                ts = self.tabstop
                ws = ' ' * (ts - (self.readline.l_buffer.point % ts))
                self.set_text(ws)
            elif char == '\x08':  # backspace
                self.key_backspace(char)
            else:
                self.set_text(char)
            return
        if self.state == _VI_MOTION_ARGUMENT:
            self.set_motion_argument(char)
            return
        if self.state == _VI_REPLACE_ONE:
            self.replace_one(char)
            return
        try:
            fcn_instance = self.dct_fcn[ord(char)]
        except BaseException:
            fcn_instance = getattr(self, 'key_%s' % char, None)
        if fcn_instance:
            fcn_instance(char)
            return
        if char.isdigit():
            self.key_digit(char)
            return
        # Here: could not process key
        self.error()

    def set_text(self, text):
        if self.text is None:
            self.text = text
        else:
            self.text += text
        self.set_buffer(text)

    def set_buffer(self, text):
        for char in text:
            if not self.char_isprint(char):
                continue
#             self.readline.l_buffer.insert_text(char)
#             continue
#             #overwrite in l_buffer obj
            if self.is_overwrite:
                if self.readline.l_buffer.point < len(
                        self.readline.l_buffer.line_buffer):
                    # self.readline.l_buffer[self.l_buffer.point]=char
                    self.readline.l_buffer.line_buffer[self.readline.l_buffer.point] = char
                else:
                    # self.readline.l_buffer.insert_text(char)
                    self.readline.l_buffer.line_buffer.append(char)
            else:
                # self.readline.l_buffer.insert_text(char)
                self.readline.l_buffer.line_buffer.insert(
                    self.readline.l_buffer.point, char)
            self.readline.l_buffer.point += 1

    def replace_one(self, char):
        if char == '\x1b':  # escape
            self.end()
            return
        self.is_edit = True
        self.readline.vi_save_line()
        times = self.get_multiplier()
        cursor = self.readline.l_buffer.point
        self.readline.l_buffer.line_buffer[cursor: cursor +
                                           times] = char * times
        if times > 1:
            self.readline.l_buffer.point += (times - 1)
        self.end()

    def char_isprint(self, char):
        return ord(char) >= ord(' ') and ord(char) <= ord('~')

    def key_dollar(self, char):
        self.motion = self.motion_end_in_line
        self.delete_right = 1
        self.state = _VI_MOTION
        self.apply()

    def key_hat(self, char):
        self.motion = self.motion_beginning_of_line
        self.state = _VI_MOTION
        self.apply()

    def key_0(self, char):
        if self.state in [_VI_BEGIN, _VI_ACTION]:
            self.key_hat(char)
        else:
            self.key_digit(char)

    def key_digit(self, char):
        if self.state in [_VI_BEGIN, _VI_MULTI1]:
            self.readline._vi_multiplier1 += char
            self.readline._vi_multiplier2 = ''
            self.state = _VI_MULTI1
        elif self.state in [_VI_ACTION, _VI_MULTI2]:
            self.readline._vi_multiplier2 += char
            self.state = _VI_MULTI2

    def key_w(self, char):
        if self.action == self.change:
            self.key_e(char)
            return
        self.motion = self.motion_word_short
        self.state = _VI_MOTION
        self.apply()

    def key_W(self, char):
        if self.action == self.change:
            self.key_E(char)
            return
        self.motion = self.motion_word_long
        self.state = _VI_MOTION
        self.apply()

    def key_e(self, char):
        self.motion = self.motion_end_short
        self.state = _VI_MOTION
        self.delete_right = 1
        self.apply()

    def key_E(self, char):
        self.motion = self.motion_end_long
        self.state = _VI_MOTION
        self.delete_right = 1
        self.apply()

    def key_b(self, char):
        self.motion = self.motion_back_short
        self.state = _VI_MOTION
        self.apply()

    def key_B(self, char):
        self.motion = self.motion_back_long
        self.state = _VI_MOTION
        self.apply()

    def key_f(self, char):
        self.readline._vi_key_find_direction = True
        self.motion = self.motion_find_char_forward
        self.delete_right = 1
        self.state = _VI_MOTION_ARGUMENT

    def key_F(self, char):
        self.readline._vi_key_find_direction = False
        self.motion = self.motion_find_char_backward
        self.delete_left = 1
        self.state = _VI_MOTION_ARGUMENT

    def key_t(self, char):
        self.motion = self.motion_to_char_forward
        self.delete_right = 1
        self.state = _VI_MOTION_ARGUMENT

    def key_T(self, char):
        self.motion = self.motion_to_char_backward
        self.state = _VI_MOTION_ARGUMENT

    def key_j(self, char):
        self.readline.vi_down(ViEvent(char))
        self.state = _VI_END

    def key_k(self, char):
        self.readline.vi_up(ViEvent(char))
        self.state = _VI_END

    def key_semicolon(self, char):
        if self.readline._vi_key_find_char is None:
            self.error()
            return
        if self.readline._vi_key_find_direction:
            self.motion = self.motion_find_char_forward
        else:
            self.motion = self.motion_find_char_backward
        self.set_motion_argument(self.readline._vi_key_find_char)

    def key_comma(self, char):
        if self.readline._vi_key_find_char is None:
            self.error()
            return
        if self.readline._vi_key_find_direction:
            self.motion = self.motion_find_char_backward
        else:
            self.motion = self.motion_find_char_forward
        self.set_motion_argument(self.readline._vi_key_find_char)

    def key_percent(self, char):
        '''find matching <([{}])>'''
        self.motion = self.motion_matching
        self.delete_right = 1
        self.state = _VI_MOTION
        self.apply()

    def key_dot(self, char):
        vi_cmd_edit = self.readline._vi_command_edit
        if not vi_cmd_edit:
            return
        if vi_cmd_edit.is_star:
            self.key_star(char)
            return
        if self.has_multiplier():
            count = self.get_multiplier()
        else:
            count = 0
        # Create the ViCommand object after getting multipler from self
        # Side effect of the ViCommand creation is resetting of global
        # multipliers
        vi_cmd = ViCommand(self.readline)
        if count >= 1:
            vi_cmd.set_override_multiplier(count)
            vi_cmd_edit.set_override_multiplier(count)
        elif vi_cmd_edit.override_multiplier:
            vi_cmd.set_override_multiplier(vi_cmd_edit.override_multiplier)
        for char in vi_cmd_edit.lst_char:
            vi_cmd.add_char(char)
        if vi_cmd_edit.is_overwrite and self.readline.l_buffer.point > 0:
            self.readline.l_buffer.point -= 1
        self.readline.vi_set_insert_mode(False)
        self.end()

    def key_slash(self, char):
        self.readline.vi_save_line()
        self.readline.l_buffer.line_buffer = ['/']
        self.readline.l_buffer.point = 1
        self.state = _VI_SEARCH

    def key_star(self, char):
        self.is_star = True
        self.is_edit = True
        self.readline.vi_save_line()
        completions = self.readline._get_completions()
        if completions:
            text = ' '.join(completions) + ' '
            self.readline.l_buffer.line_buffer[self.readline.begidx: self.readline.endidx + 1] = list(
                text)
            prefix_len = self.readline.endidx - self.readline.begidx
            self.readline.l_buffer.point += len(text) - prefix_len
            self.readline.vi_set_insert_mode(True)
        else:
            self.error()
        self.state = _VI_TEXT

    def key_bar(self, char):
        self.motion = self.motion_column
        self.state = _VI_MOTION
        self.apply()

    def key_tilde(self, char):
        self.is_edit = True
        self.readline.vi_save_line()
        for i in range(self.get_multiplier()):
            try:
                c = self.readline.l_buffer.line_buffer[self.readline.l_buffer.point]
                if c.isupper():
                    self.readline.l_buffer.line_buffer[self.readline.l_buffer.point] = c.lower(
                    )
                elif c.islower():
                    self.readline.l_buffer.line_buffer[self.readline.l_buffer.point] = c.upper(
                    )
                self.readline.l_buffer.point += 1
            except IndexError:
                break
        self.end()

    def key_h(self, char):
        self.motion = self.motion_left
        self.state = _VI_MOTION
        self.apply()

    def key_backspace(self, char):
        if self.state in [_VI_TEXT, _VI_SEARCH]:
            if self.text and len(self.text):
                self.text = self.text[:-1]
                try:
                    # Remove backspaces for potential dot command
                    self.lst_char.pop()
                    self.lst_char.pop()
                except IndexError:
                    pass
        else:
            self.key_h(char)
        self.readline._vi_do_backspace(self)
        if self.state == _VI_SEARCH and not (
                self.readline.l_buffer.line_buffer):
            self.state = _VI_BEGIN

    def key_l(self, char):
        self.motion = self.motion_right
        self.state = _VI_MOTION
        self.apply()

    def key_i(self, char):
        self.is_edit = True
        self.state = _VI_TEXT
        self.readline.vi_set_insert_mode(True)

    def key_I(self, char):
        self.is_edit = True
        self.state = _VI_TEXT
        self.readline.vi_set_insert_mode(True)
        self.readline.l_buffer.point = 0

    def key_a(self, char):
        self.is_edit = True
        self.state = _VI_TEXT
        self.readline.vi_set_insert_mode(True)
        if len(self.readline.l_buffer.line_buffer):
            self.readline.l_buffer.point += 1

    def key_A(self, char):
        self.is_edit = True
        self.state = _VI_TEXT
        self.readline.vi_set_insert_mode(True)
        self.readline.l_buffer.point = len(self.readline.l_buffer.line_buffer)

    def key_d(self, char):
        self.is_edit = True
        self.state = _VI_ACTION
        self.action = self.delete

    def key_D(self, char):
        self.is_edit = True
        self.state = _VI_ACTION
        self.action = self.delete_end_of_line
        self.apply()

    def key_x(self, char):
        self.is_edit = True
        self.state = _VI_ACTION
        self.action = self.delete_char
        self.apply()

    def key_X(self, char):
        self.is_edit = True
        self.state = _VI_ACTION
        self.action = self.delete_prev_char
        self.apply()

    def key_s(self, char):
        self.is_edit = True
        i1 = self.readline.l_buffer.point
        i2 = self.readline.l_buffer.point + self.get_multiplier()
        self.skip_multipler = True
        self.readline.vi_set_insert_mode(True)
        del self.readline.l_buffer.line_buffer[i1: i2]
        self.state = _VI_TEXT

    def key_S(self, char):
        self.is_edit = True
        self.readline.vi_set_insert_mode(True)
        self.readline.l_buffer.line_buffer = []
        self.readline.l_buffer.point = 0
        self.state = _VI_TEXT

    def key_c(self, char):
        self.is_edit = True
        self.state = _VI_ACTION
        self.action = self.change

    def key_C(self, char):
        self.is_edit = True
        self.readline.vi_set_insert_mode(True)
        del self.readline.l_buffer.line_buffer[self.readline.l_buffer.point:]
        self.state = _VI_TEXT

    def key_r(self, char):
        self.state = _VI_REPLACE_ONE

    def key_R(self, char):
        self.is_edit = True
        self.is_overwrite = True
        self.readline.l_buffer.overwrite = True
        self.readline.vi_set_insert_mode(True)
        self.state = _VI_TEXT

    def key_y(self, char):
        self._state = _VI_ACTION
        self.action = self.yank

    def key_Y(self, char):
        self.readline._vi_yank_buffer = self.readline.l_buffer.get_line_text()
        self.end()

    def key_p(self, char):
        if not self.readline._vi_yank_buffer:
            return
        self.is_edit = True
        self.readline.vi_save_line()
        self.readline.l_buffer.point += 1
        self.readline.l_buffer.insert_text(
            self.readline._vi_yank_buffer *
            self.get_multiplier())
        self.readline.l_buffer.point -= 1
        self.state = _VI_END

    def key_P(self, char):
        if not self.readline._vi_yank_buffer:
            return
        self.is_edit = True
        self.readline.vi_save_line()
        self.readline.l_buffer.insert_text(
            self.readline._vi_yank_buffer *
            self.get_multiplier())
        self.readline.l_buffer.point -= 1
        self.state = _VI_END

    def key_u(self, char):
        self.readline.vi_undo()
        self.state = _VI_END

    def key_U(self, char):
        self.readline.vi_undo_all()
        self.state = _VI_END

    def key_v(self, char):
        editor = ViExternalEditor(self.readline.l_buffer.line_buffer)
        self.readline.l_buffer.line_buffer = list(editor.result)
        self.readline.l_buffer.point = 0
        self.is_edit = True
        self.state = _VI_END

    def error(self):
        self.readline._bell()
        self.is_error = True

    def state_is_end(self):
        return self.state == _VI_END
    is_end = property(state_is_end)

    def state_is_search(self):
        return self.state == _VI_SEARCH
    is_search = property(state_is_search)

    def state_is_replace_one(self):
        return self.state == _VI_REPLACE_ONE
    is_replace_one = property(state_is_replace_one)

    def do_search(self):
        self.readline.vi_search_first()
        self.state = _VI_END

    def key_n(self, char):
        self.readline.vi_search_again_backward()
        self.state = _VI_END

    def key_N(self, char):
        self.readline.vi_search_again_forward()
        self.state = _VI_END

    def motion_beginning_of_line(self, line, index=0, count=1, **kw):
        return 0

    def motion_end_in_line(self, line, index=0, count=1, **kw):
        return max(0, len(self.readline.l_buffer.line_buffer) - 1)

    def motion_word_short(self, line, index=0, count=1, **kw):
        return vi_pos_word_short(line, index, count)

    def motion_word_long(self, line, index=0, count=1, **kw):
        return vi_pos_word_long(line, index, count)

    def motion_end_short(self, line, index=0, count=1, **kw):
        return vi_pos_end_short(line, index, count)

    def motion_end_long(self, line, index=0, count=1, **kw):
        return vi_pos_end_long(line, index, count)

    def motion_back_short(self, line, index=0, count=1, **kw):
        return vi_pos_back_short(line, index, count)

    def motion_back_long(self, line, index=0, count=1, **kw):
        return vi_pos_back_long(line, index, count)

    def motion_find_char_forward(self, line, index=0, count=1, char=None):
        self.readline._vi_key_find_char = char
        return vi_pos_find_char_forward(line, char, index, count)

    def motion_find_char_backward(self, line, index=0, count=1, char=None):
        self.readline._vi_key_find_char = char
        return vi_pos_find_char_backward(line, char, index, count)

    def motion_to_char_forward(self, line, index=0, count=1, char=None):
        return vi_pos_to_char_forward(line, char, index, count)

    def motion_to_char_backward(self, line, index=0, count=1, char=None):
        return vi_pos_to_char_backward(line, char, index, count)

    def motion_left(self, line, index=0, count=1, char=None):
        return max(0, index - count)

    def motion_right(self, line, index=0, count=1, char=None):
        return min(len(line), index + count)

    def motion_matching(self, line, index=0, count=1, char=None):
        return vi_pos_matching(line, index)

    def motion_column(self, line, index=0, count=1, char=None):
        return max(0, count - 1)

    def has_multiplier(self):
        return self.override_multiplier or self.readline._vi_multiplier1 or self.readline._vi_multiplier2

    def get_multiplier(self):
        if self.override_multiplier:
            return int(self.override_multiplier)
        if self.readline._vi_multiplier1 == '':
            m1 = 1
        else:
            m1 = int(self.readline._vi_multiplier1)
        if self.readline._vi_multiplier2 == '':
            m2 = 1
        else:
            m2 = int(self.readline._vi_multiplier2)
        return m1 * m2

    def set_override_multiplier(self, count):
        self.override_multiplier = count

    def apply(self):
        if self.motion:
            self.pos_motion = self.motion(
                self.readline.l_buffer.line_buffer,
                self.readline.l_buffer.point,
                self.get_multiplier(),
                char=self.motion_argument)
            if self.pos_motion < 0:
                self.error()
                return
        self.action()
        if self.state != _VI_TEXT:
            self.end()

    def movement(self):
        if self.pos_motion <= len(self.readline.l_buffer.line_buffer):
            self.readline.l_buffer.point = self.pos_motion
        else:
            self.readline.l_buffer.point = len(
                self.readline.l_buffer.line_buffer) - 1

    def yank(self):
        if self.pos_motion > self.readline.l_buffer.point:
            s = self.readline.l_buffer.line_buffer[self.readline.l_buffer.point: self.pos_motion + self.delete_right]
        else:
            index = max(0, self.pos_motion - self.delete_left)
            s = self.readline.l_buffer.line_buffer[index:
                                                   self.readline.l_buffer.point + self.delete_right]
        self.readline._vi_yank_buffer = s

    def delete(self):
        self.readline.vi_save_line()
        self.yank()
#         point=lineobj.Point(self.readline.l_buffer)
#         pm=self.pos_motion
#         del self.readline.l_buffer[point:pm]
#         return
        if self.pos_motion > self.readline.l_buffer.point:
            del self.readline.l_buffer.line_buffer[self.readline.l_buffer.point: self.pos_motion + self.delete_right]
            if self.readline.l_buffer.point > len(
                    self.readline.l_buffer.line_buffer):
                self.readline.l_buffer.point = len(
                    self.readline.l_buffer.line_buffer)
        else:
            index = max(0, self.pos_motion - self.delete_left)
            del self.readline.l_buffer.line_buffer[index:
                                                   self.readline.l_buffer.point + self.delete_right]
            self.readline.l_buffer.point = index

    def delete_end_of_line(self):
        self.readline.vi_save_line()
        # del self.readline.l_buffer [self.readline.l_buffer.point : ]
        line_text = self.readline.l_buffer.get_line_text()
        line_text = line_text[: self.readline.l_buffer.point]
        self.readline.l_buffer.set_line(line_text)
        if self.readline.l_buffer.point > 0:
            self.readline.l_buffer.point -= 1

    def delete_char(self):
        #         point=lineobj.Point(self.readline.l_buffer)
        #         del self.readline.l_buffer[point:point+self.get_multiplier ()]
        #         return
        self.pos_motion = self.readline.l_buffer.point + self.get_multiplier()
        self.delete()
        end = max(0, len(self.readline.l_buffer) - 1)
        if self.readline.l_buffer.point > end:
            self.readline.l_buffer.point = end

    def delete_prev_char(self):
        self.pos_motion = self.readline.l_buffer.point - self.get_multiplier()
        self.delete()

    def change(self):
        self.readline.vi_set_insert_mode(True)
        self.delete()
        self.skip_multipler = True
        self.state = _VI_TEXT

    def escape(self, char):
        if self.state == _VI_TEXT:
            if not self.skip_multipler:
                times = self.get_multiplier()
                if times > 1 and self.text:
                    extra = self.text * (times - 1)
                    self.set_buffer(extra)
        self.state = _VI_END

    def set_motion_argument(self, char):
        self.motion_argument = char
        self.apply()

    def end(self):
        self.state = _VI_END
        if self.readline.l_buffer.point >= len(
                self.readline.l_buffer.line_buffer):
            self.readline.l_buffer.point = max(
                0, len(self.readline.l_buffer.line_buffer) - 1)


class ViExternalEditor:
    def __init__(self, line):
        if isinstance(line, type([])):
            line = ''.join(line)
        file_tmp = self.get_tempfile()
        fp_tmp = self.file_open(file_tmp, 'w')
        fp_tmp.write(line)
        fp_tmp.close()
        self.run_editor(file_tmp)
        fp_tmp = self.file_open(file_tmp, 'r')
        self.result = fp_tmp.read()
        fp_tmp.close()
        self.file_remove(file_tmp)

    def get_tempfile(self):
        import tempfile
        return tempfile.mktemp(prefix='readline-', suffix='.py')

    def file_open(self, filename, mode):
        return file(filename, mode)

    def file_remove(self, filename):
        os.remove(filename)

    def get_editor(self):
        try:
            return os.environ['EDITOR']
        except KeyError:
            return 'notepad'  # ouch

    def run_editor(self, filename):
        cmd = '%s %s' % (self.get_editor(), filename, )
        self.run_command(cmd)

    def run_command(self, command):
        os.system(command)


class ViEvent:
    def __init__(self, char):
        self.char = char

# vi standalone functions


def vi_is_word(char):
    log('xx vi_is_word: type(%s), %s' % (type(char), char, ))
    return char.isalpha() or char.isdigit() or char == '_'


def vi_is_space(char):
    return char.isspace()


def vi_is_word_or_space(char):
    return vi_is_word(char) or vi_is_space(char)


def vi_pos_word_short(line, index=0, count=1):
    try:
        for i in range(count):
            in_word = vi_is_word(line[index])
            if not in_word:
                while not vi_is_word(line[index]):
                    index += 1
            else:
                while vi_is_word(line[index]):
                    index += 1
            while vi_is_space(line[index]):
                index += 1
        return index
    except IndexError:
        return len(line)


def vi_pos_word_long(line, index=0, count=1):
    try:
        for i in range(count):
            in_space = vi_is_space(line[index])
            if not in_space:
                while not vi_is_space(line[index]):
                    index += 1
            while vi_is_space(line[index]):
                index += 1
        return index
    except IndexError:
        return len(line)


def vi_pos_end_short(line, index=0, count=1):
    try:
        for i in range(count):
            index += 1
            while vi_is_space(line[index]):
                index += 1
            in_word = vi_is_word(line[index])
            if not in_word:
                while not vi_is_word_or_space(line[index]):
                    index += 1
            else:
                while vi_is_word(line[index]):
                    index += 1
        return index - 1
    except IndexError:
        return max(0, len(line) - 1)


def vi_pos_end_long(line, index=0, count=1):
    try:
        for i in range(count):
            index += 1
            while vi_is_space(line[index]):
                index += 1
            while not vi_is_space(line[index]):
                index += 1
        return index - 1
    except IndexError:
        return max(0, len(line) - 1)


class vi_list (list):
    '''This is a list that cannot have a negative index'''

    def __getitem__(self, key):
        try:
            if int(key) < 0:
                raise IndexError
        except ValueError:
            pass
        return list.__getitem__(self, key)


def vi_pos_back_short(line, index=0, count=1):
    line = vi_list(line)
    try:
        for i in range(count):
            index -= 1
            while vi_is_space(line[index]):
                index -= 1
            in_word = vi_is_word(line[index])
            if in_word:
                while vi_is_word(line[index]):
                    index -= 1
            else:
                while not vi_is_word_or_space(line[index]):
                    index -= 1
        return index + 1
    except IndexError:
        return 0


def vi_pos_back_long(line, index=0, count=1):
    line = vi_list(line)
    try:
        for i in range(count):
            index -= 1
            while vi_is_space(line[index]):
                index -= 1
            while not vi_is_space(line[index]):
                index -= 1
        return index + 1
    except IndexError:
        return 0


def vi_pos_find_char_forward(line, char, index=0, count=1):
    try:
        for i in range(count):
            index += 1
            while line[index] != char:
                index += 1
        return index
    except IndexError:
        return -1


def vi_pos_find_char_backward(line, char, index=0, count=1):
    try:
        for i in range(count):
            index -= 1
            while True:
                if index < 0:
                    return -1
                if line[index] == char:
                    break
                index -= 1
        return index
    except IndexError:
        return -1


def vi_pos_to_char_forward(line, char, index=0, count=1):
    index = vi_pos_find_char_forward(line, char, index, count)
    if index > 0:
        return index - 1
    return index


def vi_pos_to_char_backward(line, char, index=0, count=1):
    index = vi_pos_find_char_backward(line, char, index, count)
    if index >= 0:
        return index + 1
    return index


_vi_dct_matching = {
    '<': ('>', +1), '>': ('<', -1),
    '(': (')', +1), ')': ('(', -1),
    '[': (']', +1), ']': ('[', -1),
    '{': ('}', +1), '}': ('{', -1),
}


def vi_pos_matching(line, index=0):
    '''find matching <([{}])>'''
    anchor = None
    target = None
    delta = 1
    count = 0
    try:
        while True:
            if anchor is None:
                # first find anchor
                try:
                    target, delta = _vi_dct_matching[line[index]]
                    anchor = line[index]
                    count = 1
                except KeyError:
                    index += 1
                    continue
            else:
                # Here the anchor has been found
                # Need to get corresponding target
                if index < 0:
                    return -1
                if line[index] == anchor:
                    count += 1
                elif line[index] == target:
                    count -= 1
                    if count == 0:
                        return index
            index += delta
    except IndexError:
        return -1
