[Octave-bug-tracker] [bug #56072] @documentencoding UTF-8 tag should override __mfile_encoding__

[Colin Macdonald]

URL:
  <https://savannah.gnu.org/bugs/?56072>

                 Summary: @documentencoding UTF-8 tag should override
__mfile_encoding__
                 Project: GNU Octave
            Submitted by: cbm
            Submitted on: Thu 04 Apr 2019 07:10:23 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

There was a thread about __mfile_encoding__.  I didn't follow the whole thing
but I think the gist was that it was something that would come from the host
system.

There is at least one case where we know for sure: if the texinfo in the file
specifies address@hidden UTF-8`.

Thus we should override `__mfile_encoding__` on a file-by-file basis if there
is an explicit address@hidden tag.

In Symbolic, the texinfo is full of UTF-8 unicode chars.  This is starting to
work on Windows, as is the unicode-rendered math.  Funnily enough, one thing
that doesn't work is the "1×2 matrix" in:


>> [sin(a/2) pi]
ans = (sym 1×2 matrix)

  ⎡   ⎛a⎞   ⎤
  ⎢sin⎜─⎟  π⎥
  ⎣   ⎝2⎠   ⎦


(On Windows, one gets something like "$\tilde{A}--$".
This is because this string is directly written in the @sym/display.m file:

 function [s1 s2] = sym_describe(x, unicode_dec)
   if (unicode_dec)
-    timesstr = '×';

And is thus interpreted by whatever lies __mfile_encoding__ chooses today/on
this OS/with this moon phase.  But this is crazy because we just pulled utf-8
texinfo from the top of the very same file...

I plan to workaround this by not having any non-ascii chars in my code:
https://github.com/cbm755/octsympy/issues/941
Although this still leaves `!%` BISTs.




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