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file.py

# Copyright (C) 2009, 2010  Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import re
from ranger.fsobject import FileSystemObject
from subprocess import Popen, PIPE
from ranger.core.loader import CommandLoader

N_FIRST_BYTES = 256
control_characters = set(chr(n) for n in
            set(range(0, 9)) | set(range(14, 32)))

# Don't even try to preview files which mach this regular expression:
PREVIEW_BLACKLIST = re.compile(r"""
            # look at the extension:
            \.(
                  # one character extensions:
                        [oa]
                  # media formats:
                        | avi | mpe?g | mp\d | og[gmv] | wm[av] | mkv | flv
                        | vob | wav | mpc | flac | divx? | xcf | pdf
                  # binary files:
                        | torrent | class | so | img | py[co] | dmg
            )
            # ignore filetype-independent suffixes:
                  (\.part|\.bak|~)?
            # ignore fully numerical file extensions:
                  (\.\d+)*?
            $
""", re.VERBOSE | re.IGNORECASE)

# Preview these files (almost) always:
PREVIEW_WHITELIST = re.compile(r"""
            \.(
                  txt | py | c
            )
            # ignore filetype-independent suffixes:
                  (\.part|\.bak|~)?
            $
""", re.VERBOSE | re.IGNORECASE)

00054 class File(FileSystemObject):
      is_file = True
      preview_data = None
      preview_known = False
      preview_loading = False

      @property
      def firstbytes(self):
            try:
                  return self._firstbytes
            except:
                  try:
                        f = open(self.path, 'r')
                        self._firstbytes = f.read(N_FIRST_BYTES)
                        f.close()
                        return self._firstbytes
                  except:
                        pass

      def is_binary(self):
            if self.firstbytes and control_characters & set(self.firstbytes):
                  return True
            return False

      def has_preview(self):
            if not self.fm.settings.preview_files:
                  return False
            if self.is_socket or self.is_fifo or self.is_device:
                  return False
            if not self.accessible:
                  return False
            if self.fm.settings.preview_script and \
                        self.fm.settings.use_preview_script:
                  return True
            if self.image or self.container:
                  return False
            if PREVIEW_WHITELIST.search(self.basename):
                  return True
            if PREVIEW_BLACKLIST.search(self.basename):
                  return False
            if self.path == '/dev/core' or self.path == '/proc/kcore':
                  return False
            if self.is_binary():
                  return False
            return True

      def get_preview_source(self, width, height):
            return self.fm.get_preview(self.realpath, width, height)

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