def popen3(cmd):
proc = subprocess.Popen(cmd,
shell=True,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
stderr=subprocess.PIPE,
bufsize=-1)
stdin = os._wrap_close(io.TextIOWrapper(proc.stdin), proc)
stdout = os._wrap_close(io.TextIOWrapper(proc.stdout), proc)
stderr = os._wrap_close(io.TextIOWrapper(proc.stderr), proc)
return stdin, stdout, stderr, proc
def myopen(cmd, buffering=-1):
proc = subprocess.Popen(cmd,
shell=True,
stdout=subprocess.PIPE,
bufsize=buffering,
executable='/bin/bash')
return os._wrap_close(io.TextIOWrapper(proc.stdout), proc)
def validate_password(password: str) -> bool:
proc = subprocess.Popen(
'sudo -k && echo {} | sudo -S whoami'.format(password),
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL,
bufsize=-1)
stream = os._wrap_close(io.TextIOWrapper(proc.stdout), proc)
res = stream.read()
stream.close()
return bool(res.strip())
def pager_page(strng, start=0, screen_lines=0, pager_cmd=None):
"""Display a string, piping through a pager after a certain length.
strng can be a mime-bundle dict, supplying multiple representations,
keyed by mime-type.
The screen_lines parameter specifies the number of *usable* lines of your
terminal screen (total lines minus lines you need to reserve to show other
information).
If you set screen_lines to a number <=0, page() will try to auto-determine
your screen size and will only use up to (screen_size+screen_lines) for
printing, paging after that. That is, if you want auto-detection but need
to reserve the bottom 3 lines of the screen, use screen_lines = -3, and for
auto-detection without any lines reserved simply use screen_lines = 0.
If a string won't fit in the allowed lines, it is sent through the
specified pager command. If none given, look for PAGER in the environment,
and ultimately default to less.
If no system pager works, the string is sent through a 'dumb pager'
written in python, very simplistic.
"""
# for compatibility with mime-bundle form:
if isinstance(strng, dict):
strng = strng['text/plain']
# Ugly kludge, but calling curses.initscr() flat out crashes in emacs
TERM = os.environ.get('TERM','dumb')
if TERM in ['dumb','emacs'] and os.name != 'nt':
print(strng)
return
# chop off the topmost part of the string we don't want to see
str_lines = strng.splitlines()[start:]
str_toprint = os.linesep.join(str_lines)
num_newlines = len(str_lines)
len_str = len(str_toprint)
# Dumb heuristics to guesstimate number of on-screen lines the string
# takes. Very basic, but good enough for docstrings in reasonable
# terminals. If someone later feels like refining it, it's not hard.
numlines = max(num_newlines,int(len_str/80)+1)
screen_lines_def = get_terminal_size()[1]
# auto-determine screen size
if screen_lines <= 0:
try:
screen_lines += _detect_screen_size(screen_lines_def)
except (TypeError, UnsupportedOperation):
print(str_toprint)
return
#print 'numlines',numlines,'screenlines',screen_lines # dbg
if numlines <= screen_lines :
#print '*** normal print' # dbg
print(str_toprint)
else:
# Try to open pager and default to internal one if that fails.
# All failure modes are tagged as 'retval=1', to match the return
# value of a failed system command. If any intermediate attempt
# sets retval to 1, at the end we resort to our own page_dumb() pager.
pager_cmd = get_pager_cmd(pager_cmd)
pager_cmd += ' ' + get_pager_start(pager_cmd,start)
if os.name == 'nt':
if pager_cmd.startswith('type'):
# The default WinXP 'type' command is failing on complex strings.
retval = 1
else:
fd, tmpname = tempfile.mkstemp('.txt')
tmppath = Path(tmpname)
try:
os.close(fd)
with tmppath.open("wt") as tmpfile:
tmpfile.write(strng)
cmd = "%s < %s" % (pager_cmd, tmppath)
# tmpfile needs to be closed for windows
if os.system(cmd):
retval = 1
else:
retval = None
finally:
Path.unlink(tmppath)
else:
try:
retval = None
# Emulate os.popen, but redirect stderr
proc = subprocess.Popen(pager_cmd,
shell=True,
stdin=subprocess.PIPE,
stderr=subprocess.DEVNULL
)
pager = os._wrap_close(io.TextIOWrapper(proc.stdin), proc)
try:
pager_encoding = pager.encoding or sys.stdout.encoding
pager.write(strng)
finally:
retval = pager.close()
except IOError as msg: # broken pipe when user quits
if msg.args == (32, 'Broken pipe'):
retval = None
else:
retval = 1
except OSError:
# Other strange problems, sometimes seen in Win2k/cygwin
retval = 1
if retval is not None:
page_dumb(strng,screen_lines=screen_lines)
def popen(cmd):
proc = subprocess.Popen(cmd, shell=True, stdin=None,
stdout=subprocess.PIPE)
return os._wrap_close(io.TextIOWrapper(proc.stdout, encoding='utf-8'), proc)
