Source code for i3pystatus.core.command
import logging
import shlex
import subprocess
from collections import namedtuple
CommandResult = namedtuple("Result", ['rc', 'out', 'err'])
[docs]def run_through_shell(command, enable_shell=False):
"""
Retrieve output of a command.
Returns a named tuple with three elements:
* ``rc`` (integer) Return code of command.
* ``out`` (string) Everything that was printed to stdout.
* ``err`` (string) Everything that was printed to stderr.
Don't use this function with programs that outputs lots of data since the
output is saved in one variable.
:param command: A string or a list of strings containing the name and
arguments of the program.
:param enable_shell: If set ot `True` users default shell will be invoked
and given ``command`` to execute. The ``command`` should obviously be a
string since shell does all the parsing.
"""
if not enable_shell and isinstance(command, str):
command = shlex.split(command)
returncode = None
stderr = None
try:
proc = subprocess.Popen(command, stderr=subprocess.PIPE,
stdout=subprocess.PIPE, shell=enable_shell)
out, stderr = proc.communicate()
out = out.decode("UTF-8")
stderr = stderr.decode("UTF-8")
returncode = proc.returncode
except OSError as e:
out = e.strerror
stderr = e.strerror
logging.getLogger("i3pystatus.core.command").exception("")
except subprocess.CalledProcessError as e:
out = e.output
logging.getLogger("i3pystatus.core.command").exception("")
return CommandResult(returncode, out, stderr)
[docs]def execute(command, detach=False):
"""
Runs a command in background. No output is retrieved. Useful for running GUI
applications that would block click events.
:param command: A string or a list of strings containing the name and
arguments of the program.
:param detach: If set to `True` the program will be executed using the
`i3-msg` command. As a result the program is executed independent of
i3pystatus as a child of i3 process. Because of how i3-msg parses its
arguments the type of `command` is limited to string in this mode.
"""
if detach:
if not isinstance(command, str):
msg = "Detached mode expects a string as command, not {}".format(
command)
logging.getLogger("i3pystatus.core.command").error(msg)
raise AttributeError(msg)
command = ["i3-msg", "exec", command]
else:
if isinstance(command, str):
command = shlex.split(command)
try:
subprocess.Popen(command, stdin=subprocess.DEVNULL,
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
except OSError:
logging.getLogger("i3pystatus.core.command").exception("")
except subprocess.CalledProcessError:
logging.getLogger("i3pystatus.core.command").exception("")