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Daniel Dräs
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filesystem.py
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295
filesystem.py
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"""
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General file system methods.
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.. moduleauthor:: Jaisen Mathai <jaisen@jmathai.com>
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"""
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from __future__ import print_function
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from builtins import object
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import os
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import re
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import shutil
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import time
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from elodie import geolocation
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from elodie import constants
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from elodie.localstorage import Db
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from elodie.media.media import Media
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from elodie.media.text import Text
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from elodie.media.audio import Audio
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from elodie.media.photo import Photo
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from elodie.media.video import Video
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class FileSystem(object):
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"""A class for interacting with the file system."""
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def create_directory(self, directory_path):
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"""Create a directory if it does not already exist.
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:param str directory_name: A fully qualified path of the
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to create.
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:returns: bool
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"""
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try:
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if os.path.exists(directory_path):
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return True
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else:
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os.makedirs(directory_path)
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return True
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except OSError:
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# OSError is thrown for cases like no permission
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pass
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return False
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def delete_directory_if_empty(self, directory_path):
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"""Delete a directory only if it's empty.
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Instead of checking first using `len([name for name in
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os.listdir(directory_path)]) == 0`, we catch the OSError exception.
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:param str directory_name: A fully qualified path of the directory
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to delete.
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"""
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try:
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os.rmdir(directory_path)
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return True
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except OSError:
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pass
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return False
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def get_all_files(self, path, extensions=None):
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"""Recursively get all files which match a path and extension.
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:param str path string: Path to start recursive file listing
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:param tuple(str) extensions: File extensions to include (whitelist)
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"""
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files = []
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for dirname, dirnames, filenames in os.walk(path):
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# print path to all filenames.
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for filename in filenames:
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if(
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extensions is None or
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filename.lower().endswith(extensions)
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):
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files.append(os.path.join(dirname, filename))
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return files
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def get_current_directory(self):
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"""Get the current working directory.
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:returns: str
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"""
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return os.getcwd()
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def get_file_name(self, media):
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"""Generate file name for a photo or video using its metadata.
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We use an ISO8601-like format for the file name prefix. Instead of
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colons as the separator for hours, minutes and seconds we use a hyphen.
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https://en.wikipedia.org/wiki/ISO_8601#General_principles
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:param media: A Photo or Video instance
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:type media: :class:`~elodie.media.photo.Photo` or
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:class:`~elodie.media.video.Video`
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:returns: str or None for non-photo or non-videos
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"""
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if(not media.is_valid()):
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return None
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metadata = media.get_metadata()
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if(metadata is None):
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return None
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# If the file has EXIF title we use that in the file name
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# (i.e. my-favorite-photo-img_1234.jpg)
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# We want to remove the date prefix we add to the name.
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# This helps when re-running the program on file which were already
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# processed.
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base_name = re.sub(
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'^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}-',
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'',
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metadata['base_name']
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)
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if(len(base_name) == 0):
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base_name = metadata['base_name']
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if(
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'title' in metadata and
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metadata['title'] is not None and
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len(metadata['title']) > 0
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):
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title_sanitized = re.sub('\W+', '-', metadata['title'].strip())
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base_name = base_name.replace('-%s' % title_sanitized, '')
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base_name = '%s-%s' % (base_name, title_sanitized)
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file_name = '%s-%s.%s' % (
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time.strftime(
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'%Y-%m-%d_%H-%M-%S',
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metadata['date_taken']
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),
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base_name,
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metadata['extension'])
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return file_name.lower()
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def get_folder_name_by_date(self, time_obj):
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"""Get date based folder name.
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:param time time_obj: Time object to be used to determine folder name.
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:returns: str
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"""
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return time.strftime('%Y-%m-%b', time_obj)
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def get_folder_path(self, metadata):
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"""Get folder path by various parameters.
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:param time time_obj: Time object to be used to determine folder name.
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:returns: str
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"""
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path = []
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if(metadata['date_taken'] is not None):
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path.append(time.strftime('%Y-%m-%b', metadata['date_taken']))
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if(metadata['album'] is not None):
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path.append(metadata['album'])
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elif(
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metadata['latitude'] is not None and
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metadata['longitude'] is not None
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):
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place_name = geolocation.place_name(
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metadata['latitude'],
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metadata['longitude']
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)
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if(place_name is not None):
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path.append(place_name)
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# if we don't have a 2nd level directory we use 'Unknown Location'
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if(len(path) < 2):
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path.append('Unknown Location')
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# return '/'.join(path[::-1])
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return os.path.join(*path)
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def process_file(self, _file, destination, media, **kwargs):
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move = False
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if('move' in kwargs):
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move = kwargs['move']
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allow_duplicate = False
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if('allowDuplicate' in kwargs):
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allow_duplicate = kwargs['allowDuplicate']
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if(not media.is_valid()):
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print('%s is not a valid media file. Skipping...' % _file)
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return
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metadata = media.get_metadata()
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directory_name = self.get_folder_path(metadata)
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dest_directory = os.path.join(destination, directory_name)
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file_name = self.get_file_name(media)
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dest_path = os.path.join(dest_directory, file_name)
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db = Db()
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checksum = db.checksum(_file)
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if(checksum is None):
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if(constants.debug is True):
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print('Could not get checksum for %s. Skipping...' % _file)
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return
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# If duplicates are not allowed and this hash exists in the db then we
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# return
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if(allow_duplicate is False and db.check_hash(checksum) is True):
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if(constants.debug is True):
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print('%s already exists at %s. Skipping...' % (
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_file,
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db.get_hash(checksum)
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))
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return
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self.create_directory(dest_directory)
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if(move is True):
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stat = os.stat(_file)
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shutil.move(_file, dest_path)
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os.utime(dest_path, (stat.st_atime, stat.st_mtime))
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else:
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shutil.copy(_file, dest_path)
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self.set_date_from_filename(dest_path)
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db.add_hash(checksum, dest_path)
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db.update_hash_db()
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return dest_path
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def set_date_from_filename(self, file):
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""" Set the modification time on the file base on the file name.
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"""
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date_taken = None
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file_name = os.path.basename(file)
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# Initialize date taken to what's returned from the metadata function.
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# If the folder and file name follow a time format of
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# YYYY-MM/DD-IMG_0001.JPG then we override the date_taken
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(year, month, day) = [None] * 3
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year_month_day_match = re.search('(\d{4})-(\d{2})-(\d{2})', file_name)
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if(year_month_day_match is not None):
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(year, month, day) = year_month_day_match.groups()
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# check if the file system path indicated a date and if so we
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# override the metadata value
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if(year is not None and month is not None and day is not None):
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date_taken = time.strptime(
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'{}-{}-{}'.format(year, month, day),
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'%Y-%m-%d'
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)
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os.utime(file, (time.time(), time.mktime(date_taken)))
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def set_date_from_path_video(self, video):
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"""Set the modification time on the file based on the file path.
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Noop if the path doesn't match the format YYYY-MM/DD-IMG_0001.JPG.
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:param elodie.media.video.Video video: An instance of Video.
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"""
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date_taken = None
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video_file_path = video.get_file_path()
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# Initialize date taken to what's returned from the metadata function.
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# If the folder and file name follow a time format of
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# YYYY-MM/DD-IMG_0001.JPG then we override the date_taken
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(year, month, day) = [None] * 3
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directory = os.path.dirname(video_file_path)
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# If the directory matches we get back a match with
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# groups() = (year, month)
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year_month_match = re.search('(\d{4})-(\d{2})', directory)
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if(year_month_match is not None):
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(year, month) = year_month_match.groups()
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day_match = re.search(
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'^(\d{2})',
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os.path.basename(video.get_file_path())
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)
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if(day_match is not None):
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day = day_match.group(1)
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# check if the file system path indicated a date and if so we
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# override the metadata value
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if(year is not None and month is not None):
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if(day is not None):
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date_taken = time.strptime(
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'{}-{}-{}'.format(year, month, day),
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'%Y-%m-%d'
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)
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else:
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date_taken = time.strptime(
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'{}-{}'.format(year, month),
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'%Y-%m'
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)
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os.utime(video_file_path, (time.time(), time.mktime(date_taken)))
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