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rtcwd.py
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rtcwd.py
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#!/usr/bin/env python
# -*- Python -*-
# -*- coding: utf-8 -*-
'''rtcshell
Copyright (C) 2009-2010
Geoffrey Biggs
RT-Synthesis Research Group
Intelligent Systems Research Institute,
National Institute of Advanced Industrial Science and Technology (AIST),
Japan
All rights reserved.
Licensed under the Eclipse Public License -v 1.0 (EPL)
http://www.opensource.org/licenses/eclipse-1.0.txt
File: rtcwd.py
Create a command to change the current working directory environment variable.
'''
__version__ = '$Revision: $'
# $Source$
#!/usr/bin/env python
import os
from rtctree.exceptions import RtcTreeError
from rtctree.tree import create_rtctree
from rtctree.path import parse_path
import sys
from rtcshell.path import ENV_VAR, cmd_path_to_full_path
if sys.platform == 'win32':
SET_CMD = 'set'
EQUALS = '='
QUOTE = ''
elif 'SHELL' in os.environ and 'csh' in os.environ['SHELL']:
SET_CMD = 'setenv'
EQUALS = ' '
QUOTE = '"'
else:
SET_CMD = 'export'
EQUALS = '='
QUOTE = '"'
def make_cmd_line(path):
return '{0} {1}{2}{3}{4}{3}'.format(SET_CMD, ENV_VAR, EQUALS, QUOTE, path)
def cd(cmd_path, full_path):
path, port = parse_path(full_path)
if port:
# Can't change dir to a port
print >>sys.stderr, 'rtcd: {0}: Not a \
directory'.format(cmd_path)
return 1
if not path[-1]:
# Remove trailing slash part
path = path[:-1]
tree = create_rtctree(paths=path)
if not tree:
return 1
if not tree.has_path(path):
print >>sys.stderr, 'rtcd: {0}: No such directory or \
object'.format(cmd_path)
return 1
if not tree.is_directory(path):
print >>sys.stderr, 'rtcd: {0}: Not a directory'.format(cmd_path)
return 1
print make_cmd_line(full_path)
return 0
def main(argv):
if len(argv) < 2:
# Change to the root dir
print '{0} {1}{3}{2}/{2}'.format(SET_CMD, ENV_VAR, QUOTE, EQUALS)
return 0
else:
# Take the first argument only
cmd_path = argv[1]
if cmd_path == '.' or cmd_path == './':
# Special case for '.': do nothing
if ENV_VAR in os.environ:
print make_cmd_line(os.environ[ENV_VAR])
return 0
else:
print make_cmd_line('/')
return 0
elif cmd_path == '..' or cmd_path == '../':
# Special case for '..': go up one directory
if ENV_VAR in os.environ and os.environ[ENV_VAR] and \
os.environ[ENV_VAR] != '/':
parent = os.environ[ENV_VAR][:os.environ[ENV_VAR].rstrip('/').rfind('/')]
if not parent:
parent = '/'
print make_cmd_line(parent)
return 0
else:
print make_cmd_line('/')
return 0
full_path = cmd_path_to_full_path(cmd_path)
return cd(cmd_path, full_path)
if __name__ == '__main__':
sys.exit(main(sys.argv))
# vim: tw=79