% $Id: lualatexquotejobname.tex 22998 2011-06-15 22:08:46Z mpg $
% Manuel Pegourie-Gonnard, originally written 2010. WTFPL v2.
%
% Quote \jobname if it contains spaces, similarly to what other engines do.
%
% Recent versions of luatex kindly provide a process_jobname callback for
% this. Detect if it is available and use a fallback in pure TeX otherwise.
% If using the callback, register it at \everyjob time since callbacks are not
% dumped in formats currently.
%
% The TeX version fails (jobname is set to texput) with invocations like
%   luatex '\input foo'
% but work correctly with the following:
%   luatex foo\ bar
%   luatex -jobname foo\ bar '\input "foo bar"'
% It is is not possible to support all this case without the callback. It is
% debatable if supporting another set cases would be better, but this is the
% historical (TL 2010) behaviour, so just keep it.
%
% \jobname quoting is normalized in the same way as in web2c's
% normalize_quotes() function (see lib/texmfmp.c, non-XeTeX case), that is:
% - remove quotes
% - complain if quotes are not "balanced" (ie not in even number)
% - enclose the result in quotes iff it contains spaces
%
% This file is inputed after latex.ltx.
%
\makeatletter
\everyjob\expandafter{\the\everyjob
  \ifcase\directlua{
    tex.sprint(callback.list().process_jobname == nil and 0 or 1)}\relax
    % no callback, do what we can in TeX
    \begingroup
    % strip quotes from job name and count them
    \def\stripquotes#1"#2\@nil{%
      \edef\clean{\clean#1}%
      \ifx\empty#2\empty \else
        \advance\count@\@ne
        \stripquotes#2\@nil
      \fi}%
    \count@\z@
    \def\clean{}%
    \expandafter\stripquotes\jobname"\@nil
    % complain if their was not an even ("balanced") number of quotes
    \ifodd\count@
      \errmessage{Unbalanced quotes in jobname: \jobname}%
    \fi
    % now check if their are spaces and quote if necessary
    \def\testsp#1 #2\@nil{%
      \ifx\empty#2\empty
        \edef\fixjobname{\def\noexpand\jobname{\clean}}%
      \else
        \edef\fixjobname{\def\noexpand\jobname{"\clean"}}%
      \fi}%
    \edef\dotest{\noexpand\testsp\clean\space\noexpand\@nil}\dotest
    % do it after closing the group
    \expandafter\endgroup\fixjobname
  \or % callback available, use it
    % function in a separate file for convenience (uses %, ~, etc)
    \directlua{dofile(assert(kpse.find_file("lualatexquotejobname.lua")))}
  \fi}
\makeatother
\endinput