"""
Python Script Wrapper for Windows
=================================
setuptools includes wrappers for Python scripts that allows them to be
executed like regular windows programs. There are 2 wrappers, one
for command-line programs, cli.exe, and one for graphical programs,
gui.exe. These programs are almost identical, function pretty much
the same way, and are generated from the same source file. The
wrapper programs are used by copying them to the directory containing
the script they are to wrap and with the same name as the script they
are to wrap.
"""
import pathlib
import platform
import subprocess
import sys
import textwrap
import pytest
from setuptools._importlib import resources
pytestmark = pytest.mark.skipif(sys.platform != 'win32', reason="Windows only")
class WrapperTester:
@classmethod
def prep_script(cls, template):
python_exe = subprocess.list2cmdline([sys.executable])
return template % locals()
@classmethod
def create_script(cls, tmpdir):
"""
Create a simple script, foo-script.py
Note that the script starts with a Unix-style '#!' line saying which
Python executable to run. The wrapper will use this line to find the
correct Python executable.
"""
script = cls.prep_script(cls.script_tmpl)
with (tmpdir / cls.script_name).open('w') as f:
f.write(script)
# also copy cli.exe to the sample directory
with (tmpdir / cls.wrapper_name).open('wb') as f:
w = resources.files('setuptools').joinpath(cls.wrapper_source).read_bytes()
f.write(w)
def win_launcher_exe(prefix):
"""A simple routine to select launcher script based on platform."""
assert prefix in ('cli', 'gui')
if platform.machine() == "ARM64":
return f"{prefix}-arm64.exe"
else:
return f"{prefix}-32.exe"
class TestCLI(WrapperTester):
script_name = 'foo-script.py'
wrapper_name = 'foo.exe'
wrapper_source = win_launcher_exe('cli')
script_tmpl = textwrap.dedent(
"""
#!%(python_exe)s
import sys
input = repr(sys.stdin.read())
print(sys.argv[0][-14:])
print(sys.argv[1:])
print(input)
if __debug__:
print('non-optimized')
"""
).lstrip()
def test_basic(self, tmpdir):
"""
When the copy of cli.exe, foo.exe in this example, runs, it examines
the path name it was run with and computes a Python script path name
by removing the '.exe' suffix and adding the '-script.py' suffix. (For
GUI programs, the suffix '-script.pyw' is added.) This is why we
named out script the way we did. Now we can run out script by running
the wrapper:
This example was a little pathological in that it exercised windows
(MS C runtime) quoting rules:
- Strings containing spaces are surrounded by double quotes.
- Double quotes in strings need to be escaped by preceding them with
back slashes.
- One or more backslashes preceding double quotes need to be escaped
by preceding each of them with back slashes.
"""
self.create_script(tmpdir)
cmd = [
str(tmpdir / 'foo.exe'),
'arg1',
'arg 2',
'arg "2\\"',
'arg 4\\',
'arg5 a\\\\b',
]
proc = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
text=True,
encoding="utf-8",
)
stdout, _stderr = proc.communicate('hello\nworld\n')
actual = stdout.replace('\r\n', '\n')
expected = textwrap.dedent(
r"""
\foo-script.py
['arg1', 'arg 2', 'arg "2\\"', 'arg 4\\', 'arg5 a\\\\b']
'hello\nworld\n'
non-optimized
"""
).lstrip()
assert actual == expected
def test_symlink(self, tmpdir):
"""
Ensure that symlink for the foo.exe is working correctly.
"""
script_dir = tmpdir / "script_dir"
script_dir.mkdir()
self.create_script(script_dir)
symlink = pathlib.Path(tmpdir / "foo.exe")
symlink.symlink_to(script_dir / "foo.exe")
cmd = [
str(tmpdir / 'foo.exe'),
'arg1',
'arg 2',
'arg "2\\"',
'arg 4\\',
'arg5 a\\\\b',
]
proc = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
text=True,
encoding="utf-8",
)
stdout, _stderr = proc.communicate('hello\nworld\n')
actual = stdout.replace('\r\n', '\n')
expected = textwrap.dedent(
r"""
\foo-script.py
['arg1', 'arg 2', 'arg "2\\"', 'arg 4\\', 'arg5 a\\\\b']
'hello\nworld\n'
non-optimized
"""
).lstrip()
assert actual == expected
def test_with_options(self, tmpdir):
"""
Specifying Python Command-line Options
--------------------------------------
You can specify a single argument on the '#!' line. This can be used
to specify Python options like -O, to run in optimized mode or -i
to start the interactive interpreter. You can combine multiple
options as usual. For example, to run in optimized mode and
enter the interpreter after running the script, you could use -Oi:
"""
self.create_script(tmpdir)
tmpl = textwrap.dedent(
"""
#!%(python_exe)s -Oi
import sys
input = repr(sys.stdin.read())
print(sys.argv[0][-14:])
print(sys.argv[1:])
print(input)
if __debug__:
print('non-optimized')
sys.ps1 = '---'
"""
).lstrip()
with (tmpdir / 'foo-script.py').open('w') as f:
f.write(self.prep_script(tmpl))
cmd = [str(tmpdir / 'foo.exe')]
proc = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True,
encoding="utf-8",
)
stdout, _stderr = proc.communicate()
actual = stdout.replace('\r\n', '\n')
expected = textwrap.dedent(
r"""
\foo-script.py
[]
''
---
"""
).lstrip()
assert actual == expected
class TestGUI(WrapperTester):
"""
Testing the GUI Version
-----------------------
"""
script_name = 'bar-script.pyw'
wrapper_source = win_launcher_exe('gui')
wrapper_name = 'bar.exe'
script_tmpl = textwrap.dedent(
"""
#!%(python_exe)s
import sys
f = open(sys.argv[1], 'wb')
bytes_written = f.write(repr(sys.argv[2]).encode('utf-8'))
f.close()
"""
).strip()
def test_basic(self, tmpdir):
"""Test the GUI version with the simple script, bar-script.py"""
self.create_script(tmpdir)
cmd = [
str(tmpdir / 'bar.exe'),
str(tmpdir / 'test_output.txt'),
'Test Argument',
]
proc = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True,
encoding="utf-8",
)
stdout, stderr = proc.communicate()
assert not stdout
assert not stderr
with (tmpdir / 'test_output.txt').open('rb') as f_out:
actual = f_out.read().decode('ascii')
assert actual == repr('Test Argument')
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