/usr/lib/python3/dist-packages/bpython/history.py is in bpython3 0.15-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 | # encoding: utf-8
# The MIT License
#
# Copyright (c) 2009 the bpython authors.
# Copyirhgt (c) 2012,2015 Sebastian Ramacher
#
# 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 unicode_literals
import io
import os
import stat
from itertools import islice
from six.moves import range
from bpython.translations import _
from bpython.filelock import FileLock
class History(object):
"""Stores readline-style history and current place in it"""
def __init__(self, entries=None, duplicates=True, hist_size=100):
if entries is None:
self.entries = ['']
else:
self.entries = list(entries)
# how many lines back in history is currently selected where 0 is the
# saved typed line, 1 the prev entered line
self.index = 0
# what was on the prompt before using history
self.saved_line = ''
self.duplicates = duplicates
self.hist_size = hist_size
def append(self, line):
self.append_to(self.entries, line)
def append_to(self, entries, line):
line = line.rstrip('\n')
if line:
if not self.duplicates:
# remove duplicates
try:
while True:
entries.remove(line)
except ValueError:
pass
entries.append(line)
def first(self):
"""Move back to the beginning of the history."""
if not self.is_at_end:
self.index = len(self.entries)
return self.entries[-self.index]
def back(self, start=True, search=False, target=None,
include_current=False):
"""Move one step back in the history."""
if target is None:
target = self.saved_line
if not self.is_at_end:
if search:
self.index += self.find_partial_match_backward(target,
include_current)
elif start:
self.index += self.find_match_backward(target, include_current)
else:
self.index += 1
return self.entry
@property
def entry(self):
"""The current entry, which may be the saved line"""
return self.entries[-self.index] if self.index else self.saved_line
@property
def entries_by_index(self):
return list(reversed(self.entries + [self.saved_line]))
def find_match_backward(self, search_term, include_current=False):
add = 0 if include_current else 1
start = self.index + add
for idx, val in enumerate(islice(self.entries_by_index, start, None)):
if val.startswith(search_term):
return idx + add
return 0
def find_partial_match_backward(self, search_term, include_current=False):
add = 0 if include_current else 1
start = self.index + add
for idx, val in enumerate(islice(self.entries_by_index, start, None)):
if search_term in val:
return idx + add
return 0
def forward(self, start=True, search=False, target=None,
include_current=False):
"""Move one step forward in the history."""
if target is None:
target = self.saved_line
if self.index > 1:
if search:
self.index -= self.find_partial_match_forward(target,
include_current)
elif start:
self.index -= self.find_match_forward(target, include_current)
else:
self.index -= 1
return self.entry
else:
self.index = 0
return self.saved_line
def find_match_forward(self, search_term, include_current=False):
add = 0 if include_current else 1
end = max(0, self.index - (1 - add))
for idx in range(end):
val = self.entries_by_index[end - 1 - idx]
if val.startswith(search_term):
return idx + (0 if include_current else 1)
return self.index
def find_partial_match_forward(self, search_term, include_current=False):
add = 0 if include_current else 1
end = max(0, self.index - (1 - add))
for idx in range(end):
val = self.entries_by_index[end - 1 - idx]
if search_term in val:
return idx + add
return self.index
def last(self):
"""Move forward to the end of the history."""
if not self.is_at_start:
self.index = 0
return self.entries[0]
@property
def is_at_end(self):
return self.index >= len(self.entries) or self.index == -1
@property
def is_at_start(self):
return self.index == 0
def enter(self, line):
if self.index == 0:
self.saved_line = line
@classmethod
def from_filename(cls, filename):
history = cls()
history.load(filename)
return history
def reset(self):
self.index = 0
self.saved_line = ''
def load(self, filename, encoding):
with io.open(filename, 'r', encoding=encoding,
errors='ignore') as hfile:
with FileLock(hfile):
self.entries = self.load_from(hfile)
def load_from(self, fd):
entries = []
for line in fd:
self.append_to(entries, line)
return entries
def save(self, filename, encoding, lines=0):
fd = os.open(filename, os.O_WRONLY | os.O_CREAT | os.TRUNC,
stat.S_IRUSR | stat.S_IWUSR)
with io.open(fd, 'w', encoding=encoding,
errors='ignore') as hfile:
with FileLock(hfile):
self.save_to(hfile, self.entries, lines)
def save_to(self, fd, entries=None, lines=0):
if entries is None:
entries = self.entries
for line in entries[-lines:]:
fd.write(line)
fd.write('\n')
def append_reload_and_write(self, s, filename, encoding):
if not self.hist_size:
return self.append(s)
try:
fd = os.open(filename, os.O_APPEND | os.O_RDWR | os.O_CREAT,
stat.S_IRUSR | stat.S_IWUSR)
with io.open(fd, 'a+', encoding=encoding,
errors='ignore') as hfile:
with FileLock(hfile):
# read entries
hfile.seek(0, os.SEEK_SET)
entries = self.load_from(hfile)
self.append_to(entries, s)
# write new entries
hfile.seek(0, os.SEEK_SET)
hfile.truncate()
self.save_to(hfile, entries, self.hist_size)
self.entries = entries
except EnvironmentError as err:
raise RuntimeError(
_('Error occurred while writing to file %s (%s)')
% (filename, err.strerror))
else:
if len(self.entries) == 0:
# Make sure that entries contains at least one element. If the
# file and s are empty, this can occur.
self.entries = ['']
|