Hi Bram,
> - When Vim was compiled with Python 2.x ":py3" gives an error
> - When Vim was compiled with Python 3.x ":python" gives an error
> - When Vim was compiled with both 2.x and 3.x both commands work
or put differently:
if (command starts with :py)
- following digits are interpreted as part of the command
and an error results if the command is not available
- this entails that a :pyxxx command must end in non-letter and
non-digit (but still allows '.',',','+',...)
And we accept the potential problems mentioned earlier.
If that's fine for you, it's fine for me, too.
I will do the changes and send a patch to vim_dev.
Roland
[email protected] schrieb am 03.09.2009 13:13:27:
>
> Roland Puntaier wrote:
>
> > Hi Bram,
> >
> > > Having two Vim executables is a bad idea. Next you have two
versions of
> > > Perl, small and big features, etc. You end up with many different
Vim
> > > executables. It's better to try and have one executable.
> >
> > OK, let's have both python2.x and python3.x.
> >
> > But let's get a common understanding first.
> > Then, if you feel comfortable to integrate that in the official
sources,
> > I can do the changes needed.
> >
> > > It's a lot easier if the Python script itself specifies what version
of
> > > Python it is for. E.g., by something in the first line. Then one
can
> > > use the ":python" command and get an error if the Python version
doesn't
> > > match. If it would be possible to build Vim with both Python 2.x
and
> > > 3.x then it would always work.
> >
> > Now I understand what you mean:
> > the vim python command gets dispatched to a C function that pre-scans
to
> > see
> > which python version to use
> > and then calls the according ex_python() or ex_python3() C functions.
> >
> > First thought: For single line statements one could use a simple "3"
to
> > decide.
> > But note: '3+X' is a valid python expression which could change X.
> > Lagacy ':python3+X' would then suddenly be forwarded to python3 as
'+X',
> > which is also valid. This could all get undetected.
> >
> > So 3 cannot be used to distinguish.
>
> Hmm, annoying. We should have required white space after the command.
> We could require that now. That still has the problem that this is
> valid: ":python3 +X"
> And would be interpreted in current Vim as ":python 3 +X"
> But do we really care?
>
> I actually can't think of a useful Python command that starts with 3.
> You can have a valid command like ":py3+4", but it has no effect, so it
> should not actually be used. Is there anything else than an expression
> that starts with the number 3?
>
> To be as backwards compatible as possible, we would require white space
> after ":python3", but ":pythonXXX" would still be accepted. XXX would
> need to start with a non-letter, but not a 3. To stay on the safe side
> we should not accept any number.
>
> > And anyway, there is no big difference from script solution to having
two
> > commands.
> > (Please comment)
> >
> >
> > I suggest a new command for python 3.
> >
> > My favourite currently
> > :PYTHON
> > I know that this is contrary to the policy to use small letters for
> > builtin ex commands,
> > but :py3 and :python3 would have problems like the one mentioned
above.
> > (:_python possibly would do, too.)
> > (please comment)
>
> Upper case letters are reserved for user commands. Breaking this
> convention makes things too complicated and confusing.
>
> An alternative would be ":pythonthree". But that looks ugly.
> ":pythree" is not nice either.
>
> Perhaps we should use ":py3", with the requirement that white space
> follows. It's not perfect, but probably the best compromise.
> Is ":py_3" better? Looks strange.
>
> - When Vim was compiled with Python 2.x ":py3" gives an error
> - When Vim was compiled with Python 3.x ":python" gives an error
> - When Vim was compiled with both 2.x and 3.x both commands work
>
>
> --
> hundred-and-one symptoms of being an internet addict:
> 179. You wonder why your household garbage can doesn't have an
> "empty recycle bin" button.
>
> /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net
\\\
> /// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/
\\\
> \\\ download, build and distribute -- http://www.A-A-P.org ///
> \\\ help me help AIDS victims -- http://ICCF-Holland.org ///
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