mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-14 11:08:15 +01:00
91 lines
2.6 KiB
Python
91 lines
2.6 KiB
Python
"""
|
|
Helper functions for interacting with the shell, and consuming shell-style
|
|
parameters provided in config files.
|
|
"""
|
|
import os
|
|
import shlex
|
|
import subprocess
|
|
try:
|
|
from shlex import quote
|
|
except ImportError:
|
|
from pipes import quote
|
|
|
|
__all__ = ['WindowsParser', 'PosixParser', 'NativeParser']
|
|
|
|
|
|
class CommandLineParser:
|
|
"""
|
|
An object that knows how to split and join command-line arguments.
|
|
|
|
It must be true that ``argv == split(join(argv))`` for all ``argv``.
|
|
The reverse neednt be true - `join(split(cmd))` may result in the addition
|
|
or removal of unnecessary escaping.
|
|
"""
|
|
@staticmethod
|
|
def join(argv):
|
|
""" Join a list of arguments into a command line string """
|
|
raise NotImplementedError
|
|
|
|
@staticmethod
|
|
def split(cmd):
|
|
""" Split a command line string into a list of arguments """
|
|
raise NotImplementedError
|
|
|
|
|
|
class WindowsParser:
|
|
"""
|
|
The parsing behavior used by `subprocess.call("string")` on Windows, which
|
|
matches the Microsoft C/C++ runtime.
|
|
|
|
Note that this is _not_ the behavior of cmd.
|
|
"""
|
|
@staticmethod
|
|
def join(argv):
|
|
# note that list2cmdline is specific to the windows syntax
|
|
return subprocess.list2cmdline(argv)
|
|
|
|
@staticmethod
|
|
def split(cmd):
|
|
import ctypes # guarded import for systems without ctypes
|
|
try:
|
|
ctypes.windll
|
|
except AttributeError:
|
|
raise NotImplementedError
|
|
|
|
# Windows has special parsing rules for the executable (no quotes),
|
|
# that we do not care about - insert a dummy element
|
|
if not cmd:
|
|
return []
|
|
cmd = 'dummy ' + cmd
|
|
|
|
CommandLineToArgvW = ctypes.windll.shell32.CommandLineToArgvW
|
|
CommandLineToArgvW.restype = ctypes.POINTER(ctypes.c_wchar_p)
|
|
CommandLineToArgvW.argtypes = (ctypes.c_wchar_p, ctypes.POINTER(ctypes.c_int))
|
|
|
|
nargs = ctypes.c_int()
|
|
lpargs = CommandLineToArgvW(cmd, ctypes.byref(nargs))
|
|
args = [lpargs[i] for i in range(nargs.value)]
|
|
assert not ctypes.windll.kernel32.LocalFree(lpargs)
|
|
|
|
# strip the element we inserted
|
|
assert args[0] == "dummy"
|
|
return args[1:]
|
|
|
|
|
|
class PosixParser:
|
|
"""
|
|
The parsing behavior used by `subprocess.call("string", shell=True)` on Posix.
|
|
"""
|
|
@staticmethod
|
|
def join(argv):
|
|
return ' '.join(quote(arg) for arg in argv)
|
|
|
|
@staticmethod
|
|
def split(cmd):
|
|
return shlex.split(cmd, posix=True)
|
|
|
|
|
|
if os.name == 'nt':
|
|
NativeParser = WindowsParser
|
|
elif os.name == 'posix':
|
|
NativeParser = PosixParser
|