terminator/terminatorlib/util.py

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#!/usr/bin/python
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# Terminator.util - misc utility functions
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# Copyright (C) 2006-2008 cmsj@tenshu.net
#
# 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, version 2 only.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Terminator.util - misc utility functions"""
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import sys
import gtk
import os
import pwd
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# set this to true to enable debugging output
DEBUG = True
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def dbg(log = ""):
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"""Print a message if debugging is enabled"""
if DEBUG:
print >> sys.stderr, log
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def err(log = ""):
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"""Print an error message"""
print >> sys.stderr, log
def gerr(message = None):
"""Display a graphical error. This should only be used for serious
errors as it will halt execution"""
dialog = gtk.MessageDialog(None, gtk.DIALOG_MODAL,
gtk.MESSAGE_ERROR, gtk.BUTTONS_OK, message)
dialog.run()
def has_ancestor(widget, wtype):
"""Walk up the family tree of widget to see if any ancestors are of type"""
while widget:
widget = widget.get_parent()
if isinstance(widget, wtype):
return(True)
return(False)
def path_lookup(command):
'''Find a command in our path'''
if os.path.isabs(command):
if os.path.isfile(command):
return(command)
else:
return(None)
elif command[:2] == './' and os.path.isfile(command):
dbg('path_lookup: Relative filename %s found in cwd' % command)
return(command)
try:
paths = os.environ['PATH'].split(':')
if len(paths[0]) == 0:
raise(ValueError)
except (ValueError, NameError):
dbg('path_lookup: PATH not set in environment, using fallbacks')
paths = ['/usr/local/bin', '/usr/bin', '/bin']
dbg('path_lookup: Using %d paths: %s', (len(paths), paths))
for path in paths:
target = os.path.join(path, command)
if os.path.isfile(target):
dbg('path_lookup: found %s' % target)
return(target)
dbg('path_lookup: Unable to locate %s' % command)
def shell_lookup():
"""Find an appropriate shell for the user"""
shells = [os.getenv('SHELL'), pwd.getpwuid(os.getuid())[6], 'bash',
'zsh', 'tcsh', 'ksh', 'csh', 'sh']
for shell in shells:
if shell is None:
continue
elif os.path.isfile(shell):
return(shell)
else:
rshell = path_lookup(shell)
if rshell is not None:
dbg('shell_lookup: Found %s at %s' % (shell, rshell))
return(rshell)
dbg('shell_lookup: Unable to locate a shell')