Aw: Re: filenames on MS Windows: follow-up

Another somewhat simplified variant of the code is now in the master branch.
It's been tested with MSVC, MinGW-w64, and OpenWatcom for console gnuplot
and wgnuplot.
We still translate the complete command line to UTF-8. I now think this is a 
desirable step, which enables using Unicode also for -e commands. As a next 
step, we should probably change the default encoding to UTF-8.  This 
backwards-incompatible change should have been made with 5.4 already.

   Bastian

> Gesendet: Freitag, 04. Dezember 2020 um 14:04 Uhr
> Von: "Allin Cottrell" <[email protected]>
> An: "Bastian Märkisch" <[email protected]>
> Cc: "gnuplot-beta" <[email protected]>
> Betreff: Re: Aw: filenames on MS Windows: follow-up
>
> On Thu, 3 Dec 2020, Bastian Märkisch wrote:
> 
> > Dear Allin,
> >
> > sorry for being slow to work on this. There is a fundamental issue with
> > the approach, which I am working on how to resolve best. Translating all
> > the command line arguments to UTF-8 is a great step forward and the
> > loading of files works fine as you point out. But this change also
> > affects and potentially breaks the -e option (try e.g.
> > -d -e "print 'öäü'").
> 
> OK, I take your point: any non-ASCII stuff in a "-e" clause on the 
> command line is going to get mangled.
> 
> > The best step in my opinion might be to just change gnuplot's default
> > encoding to utf8. This will break backward compatibility, though. A
> > remedy could be new command line options -a/-u which choose the system's
> > default encoding ("ANSI") or the utf8 encoding.
> 
> I have one other thought, and I'll try experimenting. Besides 
> setting argv to the UTF-8 recoded argument array in winmain.c, we 
> could define (say) aargv to the "ANSI" version:
> 
> #define aargv __argv
> 
> then when iterating over the args in the test for interactivity 
> (around line 630 in winmain.c) add a clause such as:
> 
> if ((argv[i][0] == '-') && (argv[i][1] == 'e')) {
>      if (i < argc - 1) {
>          argv[i+1] = aargv[i+1];
>      }
> }
> 
> This would (I think) replace the UTF-8 follow-up to -e with the 
> original locale version, for passing to gnumain().
> 
> > Please find attached a simplified version of your patch, which also
> > works for console mode gnuplot and other compilers than MinGW.
> 
> Thanks.
> 
> Allin Cottrell


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