unexpected quote escaping in spawn

[a101010]

When I pass a command with quotes to PtyProcess.spawn, it escapes the quotes, which causes my command to fail. The quotes are required and must not be escaped.

Here is code illustrating the problem:

from winpty import PtyProcess

cmd = 'cmd /c echo foo "bar" "baz"'
proc = PtyProcess.spawn(cmd)
data = proc.read(1024)
print(data)

Expected output:
foo "bar" "baz"

Actual output:
foo \"bar\" \"baz\"

[a101010]

Here is an example using subprocess that works as intended:

import subprocess

result = subprocess.run('cmd.exe /c echo foo "bar" "baz"', capture_output=True)
print(result.stdout.decode())

But I need to use pywinpty, unless I can figure out how to get subprocess to correctly signal to the called program that it should not be buffering output. (In my code, I'm getting output from a long-running process and need lines to appear with the same timing as if I had executed the command from cmd directly.)

Note that this example fails in the same way as PtyProcess.spawn if I do this instead:

import subprocess

result = subprocess.run(['cmd.exe',  '/c', 'echo foo "bar" "baz"'], capture_output=True)
print(result.stdout.decode())

[andfoy]

@a101010 Thanks for reporting! I'll take a closer look at this