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"""Utility for changing directories and execution of commands in a subshell."""
import os
import shlex
import subprocess
# Store the previous working directory for the 'cd -' command.
class Holder:
"""Holds the _prev_dir_ class attribute for chdir() function."""
_prev_dir_ = None
@classmethod
def prev_dir(cls):
return cls._prev_dir_
@classmethod
def swap(cls, dir):
cls._prev_dir_ = dir
def chdir(debugger, args, result, dict):
"""Change the working directory, or cd to ${HOME}.
You can also issue 'cd -' to change to the previous working directory."""
new_dir = args.strip()
if not new_dir:
new_dir = os.path.expanduser('~')
elif new_dir == '-':
if not Holder.prev_dir():
# Bad directory, not changing.
print "bad directory, not changing"
return
else:
new_dir = Holder.prev_dir()
Holder.swap(os.getcwd())
os.chdir(new_dir)
print "Current working directory: %s" % os.getcwd()
def system(debugger, command_line, result, dict):
"""Execute the command (a string) in a subshell."""
args = shlex.split(command_line)
process = subprocess.Popen(
args,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
output, error = process.communicate()
retcode = process.poll()
if output and error:
print "stdout=>\n", output
print "stderr=>\n", error
elif output:
print output
elif error:
print error
print "retcode:", retcode
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