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#!/usr/bin/env python
#
# XXX Python script template
#
# XXX Describe what the script does here.
#
import getopt
import os
import shlex
import sys
class Usage(Exception):
def __init__(self, msg):
self.msg = msg
class CommandRunner:
"""
Representation of a command to be executed.
"""
def __init__(self, dictionary={}):
self.subst_dictionary(dictionary)
def subst_dictionary(self, dictionary):
self._subst_dictionary = dictionary
def subst(self, string, dictionary=None):
"""
Substitutes (via the format operator) the values in the specified
dictionary into the specified command.
The command can be an (action, string) tuple. In all cases, we
perform substitution on strings and don't worry if something isn't
a string. (It's probably a Python function to be executed.)
"""
if dictionary is None:
dictionary = self._subst_dictionary
if dictionary:
try:
string = string % dictionary
except TypeError:
pass
return string
def do_display(self, string):
if isinstance(string, tuple):
func = string[0]
args = string[1:]
s = '%s(%s)' % (func.__name__, ', '.join(map(repr, args)))
else:
s = self.subst(string)
if not s.endswith('\n'):
s += '\n'
sys.stdout.write(s)
sys.stdout.flush()
def do_not_display(self, string):
pass
def do_execute(self, command):
if isinstance(command, str):
command = self.subst(command)
cmdargs = shlex.split(command)
if cmdargs[0] == 'cd':
command = (os.chdir,) + tuple(cmdargs[1:])
elif cmdargs[0] == 'mkdir':
command = (os.mkdir,) + tuple(cmdargs[1:])
if isinstance(command, tuple):
func = command[0]
args = command[1:]
return func(*args)
else:
return os.system(command)
def do_not_execute(self, command):
pass
display = do_display
execute = do_execute
def run(self, command, display=None):
"""
Runs this command, displaying it first.
The actual display() and execute() methods we call may be
overridden if we're printing but not executing, or vice versa.
"""
if display is None:
display = command
self.display(display)
return self.execute(command)
def main(argv=None):
if argv is None:
argv = sys.argv
short_options = 'hnq'
long_options = ['help', 'no-exec', 'quiet']
helpstr = """\
Usage: script-template.py [-hnq]
-h, --help Print this help and exit
-n, --no-exec No execute, just print command lines
-q, --quiet Quiet, don't print command lines
"""
try:
try:
opts, args = getopt.getopt(argv[1:], short_options, long_options)
except getopt.error as msg:
raise Usage(msg)
for o, a in opts:
if o in ('-h', '--help'):
print(helpstr)
sys.exit(0)
elif o in ('-n', '--no-exec'):
Command.execute = Command.do_not_execute
elif o in ('-q', '--quiet'):
Command.display = Command.do_not_display
except Usage as err:
sys.stderr.write(err.msg)
sys.stderr.write('use -h to get help')
return 2
commands = [
]
for command in [ Command(c) for c in commands ]:
status = command.run(command)
if status:
sys.exit(status)
if __name__ == "__main__":
sys.exit(main())
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
|
