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## Copyright (C) 2013-2015 Mike Miller
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} __gripe_missing_component__ (@var{caller}, @var{component})
## Undocumented internal function.
## @end deftypefn
function __gripe_missing_component__ (caller, component)
if (nargin != 2)
print_usage ();
endif
msg = "";
fcn = missing_component_hook ();
ftype = exist (fcn);
if (ftype == 2 || ftype == 3 || ftype == 5 || ftype == 103)
msg = feval (fcn, component);
endif
if (isempty (msg))
switch (component)
case "info-file"
msg = "unable to find the Octave info manual, Octave installation is incomplete";
case "mkoctfile"
msg = "unable to find the mkoctfile command, Octave installation is incomplete";
case "octave"
msg = "unable to find the octave executable, Octave installation is incomplete";
case "octave-config"
msg = "unable to find the octave-config command, Octave installation is incomplete";
otherwise
msg = ['unable to find required Octave component "' component '"'];
endswitch
endif
error ("%s: %s\n", caller, msg);
endfunction
## Some trivial testing
%!error <abc: unable to find the Octave info manual> __gripe_missing_component__ ("abc", "info-file")
%!error <abc: unable to find the octave executable> __gripe_missing_component__ ("abc", "octave")
%!error <abc: unable to find the octave-config command> __gripe_missing_component__ ("abc", "octave-config")
%!error <abc: unable to find required Octave component "xyz"> __gripe_missing_component__ ("abc", "xyz")
%!error __gripe_missing_component__ ()
%!error __gripe_missing_component__ ("fcn")
%!error __gripe_missing_component__ ("fcn", 1 , 2)
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