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""" 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 import pkg_resources from setuptools.command.easy_install import nt_quote_arg pytestmark = pytest.mark.skipif(sys.platform != 'win32', reason="Windows only") class WrapperTester: @classmethod def prep_script(cls, template): python_exe = nt_quote_arg(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 = pkg_resources.resource_string('setuptools', cls.wrapper_source) 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 "{}-arm64.exe".format(prefix) else: return "{}-32.exe".format(prefix) 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')