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# Copyright (C) 2009-2013 Roman Zimbelmann <hut@lavabit.com>
# This software is distributed under the terms of the GNU GPL version 3.
import re
from ranger.fsobject import FileSystemObject
from ranger.core.shared import SettingsAware
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)
class File(FileSystemObject, SettingsAware):
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 and self.fm.settings.preview_images:
return True
if 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, width, height)
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