[Octave-bug-tracker] [bug #50496] Legend and object 'interpreter' property disagree

[John W. Eaton]

Follow-up Comment #7, bug #50496 (project octave):

Rik: Octave compiles OK but there is an error when running
doc/interpreter/geometryimages.m to build figures for the docs:

http://buildbot.octave.org:8010/builders/clang-3.9-debian/builds/326/steps/compile/logs/stdio

Since that error message isn't very helpful, I build Octave and ran the
command by hand with debug_on_error set and I found


buserror:11> /bin/bash run-octave --norc --silent --no-history --path
~/src/doc/interpreter/ --eval "geometryimages ('doc/interpreter/', 'voronoi',
'eps');"
error: 'geometryimages' undefined near line 1 column 1
buserror:12> pwd
/home/jwe/build/octave
buserror:13> /bin/bash run-octave --norc --silent --no-history --path
~/src/octave/doc/interpreter/ --eval "geometryimages ('doc/interpreter/',
'voronoi', 'eps');"
error: structure has no member 'interpreter'
buserror:14> /bin/bash run-octave --norc --silent --no-history --path
~/src/octave/doc/interpreter/
octave:1> debug_on_error (1)
octave:2> geometryimages ('doc/interpreter/', 'voronoi', 'eps')
error: structure has no member 'interpreter'
error: called from
    __gnuplot_draw_axes__>__maybe_munge_text__ at line 2465 column 5
    __gnuplot_draw_axes__ at line 675 column 15
    __gnuplot_draw_figure__ at line 172 column 17
    __gnuplot_drawnow__ at line 43 column 9
    __gnuplot_print__>local_drawnow at line 226 column 5
    __gnuplot_print__>eps_drawnow at line 214 column 5
    __gnuplot_print__ at line 75 column 9
    print at line 518 column 14
    geometryimages at line 55 column 5
stopped in
/home/jwe/src/octave/scripts/plot/util/private/__gnuplot_draw_axes__.m at line
2465
2465:     if (strcmp (obj.interpreter, "tex"))
debug> obj
obj =

  scalar structure containing the fields:

    beingdeleted = off
    busyaction = queue
    buttondownfcn = [](0x0)
    children = [](0x1)
    clipping = on
    createfcn = [](0x0)
    deletefcn = [](0x0)
    handlevisibility = on
    hittest = on
    interruptible = on
    parent = -1.8402
    selected = off
    selectionhighlight = on
    tag = 
    type = line


I'm not sure what the proper fix is for this.  If a property is deprecated,
shouldn't it still work?  Or is it available with get() but not part of the
structure?  I see that the failing code is using a structure element instead
of get (obj, "interpreter").  But either way, I guess Octave needs to avoid
using this property.

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