#!/usr/bin/python
# Copyright (C) 2012-2013 Roman Zimbelmann <hut@lepus.uberspace.de>
# This software is distributed under the terms of the GNU GPL version 3.
"""rifle, the file executor/opener of ranger
This can be used as a standalone program or can be embedded in python code.
When used together with ranger, it doesn't have to be installed to $PATH.
Example usage:
rifle = Rifle("rilfe.conf")
rifle.reload_config()
rifle.execute(["file1", "file2"])
"""
import os.path
import re
from subprocess import Popen, PIPE
import sys
__version__ = 'rifle 1.6.1'
# Options and constants that a user might want to change:
DEFAULT_PAGER = 'less'
DEFAULT_EDITOR = 'nano'
ASK_COMMAND = 'ask'
ENCODING = 'utf-8'
# Imports from ranger library, plus reimplementations in case ranger is not
# installed so rifle can be run as a standalone program.
try:
from ranger.ext.get_executables import get_executables
except ImportError:
_cached_executables = None
def get_executables():
"""Return all executable files in $PATH + Cache them."""
global _cached_executables
if _cached_executables is not None:
return _cached_executables
if 'PATH' in os.environ:
paths = os.environ['PATH'].split(':')
else:
paths = ['/usr/bin', '/bin']
from stat import S_IXOTH, S_IFREG
paths_seen = set()
_cached_executables = set()
for path in paths:
if path in paths_seen:
continue
paths_seen.add(path)
try:
content = os.listdir(path)
except OSError:
continue
for item in content:
abspath = path + '/' + item
try:
filestat = os.stat(abspath)
except OSError:
continue
if filestat.st_mode & (S_IXOTH | S_IFREG):
_cached_executables.add(item)
return _cached_executables
try:
from ranger.ext.popen_forked import Popen_forked
except ImportError:
def Popen_forked(*args, **kwargs):
"""Forks process and runs Popen with the given args and kwargs."""
try:
pid = os.fork()
except OSError:
return False
if pid == 0:
os.setsid()
kwargs['stdin'] = open(os.devnull, 'r')
kwargs['stdout'] = kwargs['stderr'] = open(os.devnull, 'w')
Popen(*args, **kwargs)
os._exit(0)
return True
def _is_terminal():
# Check if stdin (file descriptor 0), stdout (fd 1) and
# stderr (fd 2) are connected to a terminal
try:
os.ttyname(0)
os.ttyname(1)
os.ttyname(2)
except:
return False
return True
def squash_flags(flags):
"""Remove lowercase flags if the respective uppercase flag exists
>>> squash_flags('abc')
'abc'
>>> squash_flags('abcC')
'ab'
>>> squash_flags('CabcAd')
'bd'
"""
exclude = ''.join(f.upper() + f.lower() for f in flags if f == f.upper())
return ''.join(f for f in flags if f not in exclude)
class Rifle(object):
delimiter1 = '='
delimiter2 = ','
# TODO: Test all of the hooks properly
def hook_before_executing(self, command, mimetype, flags):
pass
def hook_after_executing(self, command, mimetype, flags):
pass
def hook_command_preprocessing(self, command):
return command
def hook_command_postprocessing(self, command):
return command
def hook_environment(self, env):
return env
def hook_logger(self, string):
sys.stderr.write(string + "\n")
def __init__(self, config_file):
self.config_file = config_file
self._app_flags = ''
self._app_label = None
self._initialized_mimetypes = False
# get paths for mimetype files
self._mimetype_known_files = [
os.path.expanduser("~/.mime.types")]
if __file__.endswith("ranger/ext/rifle.py"):
# Add ranger's default mimetypes when run from ranger directory
self._mimetype_known_files.append(
__file__.replace("ext/rifle.py", "data/mime.types"))
def reload_config(self, config_file=None):
"""Replace the current configuration with the one in config_file"""
if config_file is None:
config_file = self.config_file
f = open(config_file, 'r')
self.rules = []
lineno = 1
for line in f:
if line.startswith('#') or line == '\n':
continue
line = line.strip()
try:
if self.delimiter1 not in line:
raise Exception("Line without delimiter")
tests, command = line.split(self.delimiter1, 1)
tests = tests.split(self.delimiter2)
tests = tuple(tuple(f.strip().split(None, 1)) for f in tests)
command = command.strip()
self.rules.append((command, tests))
except Exception as e:
self.hook_logger("Syntax error in %s line %d (%s)" % \
(config_file, lineno, str(e)))
lineno += 1
f.close()
def _eval_condition(self, condition, files, label):
# Handle the negation of conditions starting with an exclamation mark,
# then pass on the arguments to _eval_condition2().
if not condition:
return True
if condition[0].startswith('!'):
new_condition = tuple([condition[0][1:]]) + tuple(condition[1:])
return not self._eval_condition2(new_condition, files, label)
return self._eval_condition2(condition, files, label)
def _eval_condition2(self, rule, files, label):
# This function evaluates the condition, after _eval_condition() handled
# negation of conditions starting with a "!".
if not files:
return False
function = rule[0]
argument = rule[1] if len(rule) > 1 else ''
if function == 'ext':
extension = os.path.basename(files[0]).rsplit('.', 1)[-1].lower()
return bool(re.search('^(' + argument + ')$', extension))
elif function == 'name':
return bool(re.search(argument, os.path.basename(files[0])))
elif function == 'match':
return bool(re.search(argument, files[0]))
elif function == 'file':
return os.path.isfile(files[0])
elif function == 'directory':
return os.path.isdir(files[0])
elif function == 'path':
return bool(re.search(argument, os.path.abspath(files[0])))
elif function == 'mime':
return bool(re.search(argument, self._get_mimetype(files[0])))
elif function == 'has':
return argument in get_executables()
elif function == 'terminal':
return _is_terminal()
elif function == 'number':
if argument.isdigit():
self._skip = int(argument)
return True
elif function == 'label':
self._app_label = argument
if label:
return argument == label
return True
elif function == 'flag':
self._app_flags = argument
return True
elif function == 'X':
return 'DISPLAY' in os.environ
elif function == 'else':
return True
def _get_mimetype(self, fname):
# Spawn "file" to determine the mime-type of the given file.
if self._mimetype:
return self._mimetype
import mimetypes
for path in self._mimetype_known_files:
if path not in mimetypes.knownfiles:
mimetypes.knownfiles.append(path)
self._mimetype, encoding = mimetypes.guess_type(fname)
if not self._mimetype:
process = Popen(["file", "--mime-type", "-Lb", fname],
stdout=PIPE, stderr=PIPE)
mimetype, _ = process.communicate()
self._mimetype = mimetype.decode(ENCODING).strip()
return self._mimetype
def _build_command(self, files, action, flags):
# Get the flags
if isinstance(flags, str):
self._app_flags += flags
self._app_flags = squash_flags(self._app_flags)
filenames = "' '".join(f.replace("'", "'\\\''") for f in files
if "\x00" not in f)
return "set -- '%s'; %s" % (filenames, action)
def list_commands(self, files, mimetype=None):
"""List all commands that are applicable for the given files
Returns one 4-tuple for all currently applicable commands
The 4-tuple contains (count, command, label, flags).
count is the index, counted from 0 upwards,
command is the command that will be executed.
label and flags are the label and flags specified in the rule.
"""
self._mimetype = mimetype
count = -1
for cmd, tests in self.rules:
self._skip = None
self._app_flags = ''
self._app_label = None
for test in tests:
if not self._eval_condition(test, files, None):
break
else:
if self._skip is None:
count += 1
else:
count = self._skip
yield (count, cmd, self._app_label, self._app_flags)
def execute(self, files, number=0, label=None, flags="", mimetype=None):
"""Executes the given list of files.
By default, this executes the first command where all conditions apply,
but by specifying number=N you can run the 1+Nth command.
If a label is specified, only rules with this label will be considered.
If you specify the mimetype, rifle will not try to determine it itself.
By specifying a flag, you extend the flag that is defined in the rule.
Uppercase flags negate the respective lowercase flags.
For example: if the flag in the rule is "pw" and you specify "Pf", then
the "p" flag is negated and the "f" flag is added, resulting in "wf".
"""
command = None
found_at_least_one = None
# Determine command
for count, cmd, lbl, flgs in self.list_commands(files, mimetype):
if label and label == lbl or not label and count == number:
cmd = self.hook_command_preprocessing(cmd)
if cmd == ASK_COMMAND:
return ASK_COMMAND
command = self._build_command(files, cmd, flags + flgs)
flags = self._app_flags
break
else:
found_at_least_one = True
else:
if label and label in get_executables():
cmd = '%s "$@"' % label
command = self._build_command(files, cmd, flags)
# Execute command
if command is None:
if found_at_least_one:
if label:
self.hook_logger("Label '%s' is undefined" % label)
else:
self.hook_logger("Method number %d is undefined." % number)
else:
self.hook_logger("No action found.")
else:
if 'PAGER' not in os.environ:
os.environ['PAGER'] = DEFAULT_PAGER
if 'EDITOR' not in os.environ:
os.environ['EDITOR'] = DEFAULT_EDITOR
command = self.hook_command_postprocessing(command)
self.hook_before_executing(command, self._mimetype, self._app_flags)
try:
if 'r' in flags:
prefix = ['sudo', '-E', 'su', '-mc']
else:
prefix = ['/bin/sh', '-c']
cmd = prefix + [command]
if 't' in flags:
if 'TERMCMD' not in os.environ:
term = os.environ['TERM']
if term.startswith('rxvt-unicode'):
term = 'urxvt'
if term not in get_executables():
self.hook_logger("Can not determine terminal command. "
"Please set $TERMCMD manually.")
# A fallback terminal that is likely installed:
term = 'xterm'
os.environ['TERMCMD'] = term
cmd = [os.environ['TERMCMD'], '-e'] + cmd
if 'f' in flags or 't' in flags:
Popen_forked(cmd, env=self.hook_environment(os.environ))
else:
p = Popen(cmd, env=self.hook_environment(os.environ))
p.wait()
finally:
self.hook_after_executing(command, self._mimetype, self._app_flags)
def main():
"""The main function which is run when you start this program direectly."""
import sys
# Find configuration file path
if 'XDG_CONFIG_HOME' in os.environ and os.environ['XDG_CONFIG_HOME']:
conf_path = os.environ['XDG_CONFIG_HOME'] + '/ranger/rifle.conf'
else:
conf_path = os.path.expanduser('~/.config/ranger/rifle.conf')
default_conf_path = conf_path
if not os.path.isfile(conf_path):
conf_path = os.path.normpath(os.path.join(os.path.dirname(__file__),
'../config/rifle.conf'))
if not os.path.isfile(conf_path):
try:
# if ranger is installed, get the configuration from ranger
import ranger
except ImportError:
pass
else:
conf_path = os.path.join(ranger.__path__[0], "config", "rifle.conf")
# Evaluate arguments
from optparse import OptionParser
parser = OptionParser(usage="%prog [-fhlpw] [files]", version=__version__)
parser.add_option('-f', type="string", default="", metavar="FLAGS",
help="use additional flags: f=fork, r=root, t=terminal. "
"Uppercase flag negates respective lowercase flags.")
parser.add_option('-l', action="store_true",
help="list possible ways to open the files (id:label:flags:command)")
parser.add_option('-p', type='string', default='0', metavar="KEYWORD",
help="pick a method to open the files. KEYWORD is either the "
"number listed by 'rifle -l' or a string that matches a label in "
"the configuration file")
parser.add_option('-w', type='string', default=None, metavar="PROGRAM",
help="open the files with PROGRAM")
options, positional = parser.parse_args()
if not positional:
parser.print_help()
raise SystemExit(1)
if not os.path.isfile(conf_path):
sys.stderr.write("Could not find a configuration file.\n"
"Please create one at %s.\n" % default_conf_path)
raise SystemExit(1)
if options.p.isdigit():
number = int(options.p)
label = None
else:
number = 0
label = options.p
if options.w is not None and not options.l:
p = Popen([options.w] + list(positional))
p.wait()
else:
# Start up rifle
rifle = Rifle(conf_path)
rifle.reload_config()
#print(rifle.list_commands(sys.argv[1:]))
if options.l:
for count, cmd, label, flags in rifle.list_commands(positional):
print("%d:%s:%s:%s" % (count, label or '', flags, cmd))
else:
result = rifle.execute(positional, number=number, label=label,
flags=options.f)
if result == ASK_COMMAND:
# TODO: implement interactive asking for file type?
print("Unknown file type: %s" % rifle._get_mimetype(positional[0]))
if __name__ == '__main__':
if 'RANGER_DOCTEST' in os.environ:
import doctest
doctest.testmod()
else:
main()