Add some more callbacks for root properties (bug #42347). * graphics.in.h (root prop. errormessage): set read-only and declare custom get method * graphics.in.h (root prop. diary, diaryfile, echo, recursionlimit): declare custom get/set methods * graphics.cc (root::properties::get_errormessage, set_diary, get_diary, set_diaryfile, get_diaryfile, set_echo, get_echo, set_recursionlimit, get_recursionlimit): new methods. * pager.cc (F__diaryfile__, F__diarystate__): new functions to retrieve diary info. * pager.cc: set default value "diary" for diary_file static variable. * input.cc (F__echostate__): new function to retrieve echo info.

#! /bin/sh

set -e
AWK=${AWK:-awk}

conffile=$1

cat << EOF
// DO NOT EDIT!  Generated automatically from $conffile by Make."

#include "oct-map.h"
#include "ov.h"

octave_scalar_map
octave_config_features (void)
{
  octave_scalar_map m;

EOF

$AWK \
  '/#define HAVE_/ {
     sub (/HAVE_/, "", $2);
     printf ("  m.assign (\"%s\", octave_value (true));\n", $2);
   }
   /\/\* #undef HAVE_/ {
     sub (/HAVE_/, "", $3);
     printf ("  m.assign (\"%s\", octave_value (false));\n", $3);
   } {
   }' $conffile

cat << EOF

  return m;
}
EOF