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Edit File: fs.py

"""File-system utils"""
import os
import time

from twisted.python.compat import long

def create_text_file(path, content):
    """Create a file with the given content.

The content is encoded with utf-8 before writing.

@param path: The path to the file.
    @param content: The content to be written in the file.
    """
    create_binary_file(path, content.encode("utf-8"))

def create_binary_file(path, content):
    """Create a file with the given binary content.

@param path: The path to the file.
    @param content: The content to be written in the file.
    """
    with open(path, "wb") as fd:
        fd.write(content)

def append_text_file(path, content):
    """Append a file with the given content.

The file is created, if it doesn't exist already.

The content is utf-8 encoded before it is written.

@param path: The path to the file.
    @param content: The content to be written in the file at the end.
    """
    append_binary_file(path, content.encode("utf-8"))

def append_binary_file(path, content):
    """Append a file with the given binary content.

The file is created, if it doesn't exist already.

@param path: The path to the file.
    @param content: The content to be written in the file at the end.
    """
    with open(path, "ab") as fd:
        fd.write(content)

def read_text_file(path, limit=None):
    """Return the content of the given file as string.

@param path: The path to the file.
    @param limit: An optional read limit. If positive, read up to that number
        of characters from the beginning of the file. If negative, read up to
        that number of bytes from the end of the file.
    @return content: The content of the file string, possibly trimmed to
        C{limit} characters.
    """
    # Use binary mode since opening a file in text mode in Python 3 does not
    # allow non-zero offset seek from the end of the file. If a limit is
    # specified, use the 4*limit as the largest UTF-8 encoding is 4-bytes. We
    # don't worry about slicing a UTF-8 char in half firstly as error handling
    # is "replace" below, and secondly because if the first/last char is
    # corrupted as a result we won't want it anyway (because limit chars must
    # be before/after the first/last char)
    content = read_binary_file(path, None if limit is None else limit * 4)
    content = content.decode("utf-8", "replace")
    if limit is None:
        return content
    elif limit >= 0:
        return content[:limit]
    else:
        return content[limit:]

def read_binary_file(path, limit=None):
    """Return the content of the given file as bytes.

@param path: The path to the file.
    @param limit: An optional read limit. If positive, read up to that number
        of bytes from the beginning of the file. If negative, read up to that
        number of bytes from the end of the file.
    @return content: The content of the file as bytes, possibly trimmed to
        C{limit}.
    """
    with open(path, "rb") as fd:
        if limit is not None and os.path.getsize(path) > abs(limit):
            if limit >= 0:
                return fd.read(limit)
            else:
                fd.seek(limit, os.SEEK_END)
        return fd.read()

# Aliases for backwards compatibility
read_file = read_binary_file
create_file = create_binary_file

def touch_file(path, offset_seconds=None):
    """Touch a file, creating it if it doesn't exist.

@param path: the path to the file to be touched.
    @param offset_seconds: a signed integer number of seconds to offset the
        atime and mtime of the file from the current time.

"""
    open(path, "ab").close()
    if offset_seconds is not None:
        offset_time = long(time.time()) + offset_seconds
        touch_time = (offset_time, offset_time)
    else:
        touch_time = None
    os.utime(path, touch_time)