bpython-bpython/bpython/history.py at 0.25-dev · sthagen/bpython-bpython · GitHub

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# 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.

import os

from pathlib import Path

import stat

from itertools import islice, chain

from typing import Iterable, Optional, List, TextIO

from .translations import _

from .filelock import FileLock

class History:

"""Stores readline-style history and current place in it"""

def __init__(

self,

entries: Optional[Iterable[str]] = None,

duplicates: bool = True,

hist_size: int = 100,

) -> None:

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: str) -> None:

self.append_to(self.entries, line)

def append_to(self, entries: List[str], line: str) -> None:

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) -> str:

"""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: bool = True,

search: bool = False,

target: Optional[str] = None,

include_current: bool = False,

) -> str:

"""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) -> str:

"""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) -> List[str]:

return list(chain((self.saved_line,), reversed(self.entries)))

def find_match_backward(

self, search_term: str, include_current: bool = False

) -> int:

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: str, include_current: bool = False

) -> int:

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: bool = True,

search: bool = False,

target: Optional[str] = None,

include_current: bool = False,

) -> str:

"""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: str, include_current: bool = False

) -> int:

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: str, include_current: bool = False

) -> int:

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) -> str:

"""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) -> bool:

return self.index >= len(self.entries) or self.index == -1

@property

def is_at_start(self) -> bool:

return self.index == 0

def enter(self, line: str) -> None:

if self.index == 0:

self.saved_line = line

def reset(self) -> None:

self.index = 0

self.saved_line = ""

def load(self, filename: Path, encoding: str) -> None:

with open(filename, encoding=encoding, errors="ignore") as hfile:

with FileLock(hfile, filename=str(filename)):

self.entries = self.load_from(hfile)

def load_from(self, fd: TextIO) -> List[str]:

entries: List[str] = []

for line in fd:

self.append_to(entries, line)

return entries if len(entries) else [""]

def save(self, filename: Path, encoding: str, lines: int = 0) -> None:

fd = os.open(

filename,

os.O_WRONLY | os.O_CREAT | os.O_TRUNC,

stat.S_IRUSR | stat.S_IWUSR,

)

with open(fd, "w", encoding=encoding, errors="ignore") as hfile:

with FileLock(hfile, filename=str(filename)):

self.save_to(hfile, self.entries, lines)

def save_to(

self, fd: TextIO, entries: Optional[List[str]] = None, lines: int = 0

) -> None:

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: str, filename: Path, encoding: str

) -> None:

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 open(fd, "a+", encoding=encoding, errors="ignore") as hfile:

with FileLock(hfile, filename=str(filename)):

# 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 OSError 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 = [""]

bpython-bpython/bpython/history.py at 0.25-dev · sthagen/bpython-bpython · GitHub

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