[Python-Dev] New update to PEP397 - Python launcher for Windows
v+python at g.nevcal.com
Fri Jul 22 01:19:17 CEST 2011
On 7/20/2011 11:35 PM, Mark Hammond wrote:
> Customized Commands:
> The launcher will support the ability to define "Customized Commands" in a
> Windows .ini file (ie, a file which can be parsed by the Windows function
> GetPrivateProfileString). A section called '[commands]' can be created
> with key names defining the virtual command and the value specifying the
> actual command-line to be used for this virtual command.
> For example, if an INI file has the contents:
> vpython=c:\bin\vpython.exe -foo
> Then a shebang line of '#! vpython' in a script named 'doit.py' will
> result in the launcher using the command-line 'c:\bin\vpython.exe -foo
I experimented, and empirically determined, that a customized command
can be of the form
and that this works to launch Unix perl scripts on Windows
(successfully, if the perl script is actually portable).
This does not contradict the above description, but may be surprising to
some. I think it is a good thing.
Of course, the extra handling of versions, and locating of corresponding
installed versions of things applies only to Python, but some may find
uses for launching non-Python programs. This also would work for python
programs using non-CPython implementations that may not set the registry
in the same way. However, because virtual commands take precedence over
Customized Commands, there is no way to override even a specific virtual
command to point at a Python other than a CPython. (perhaps some
serious registry hacking could make a non-CPython masquerade in the
registry as a version of CPython.)
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