[NTG-context] page range reference (how to compare references)

MF massifr at fastwebnet.it
Fri Sep 23 15:02:03 CEST 2016


I found a solution, but it's tricky (and there's no check on reference
existence in structures.references.collected).


\directlua{
  function userdata.printrange(singular, plural, label)
    local coll_ref = structures.references.collected[""]
    local pagestart = coll_ref[label .. ":start"].references.realpage
    local pagestop = coll_ref[label .. ":stop"].references.realpage
    if pagestart == pagestop then
      context(singular)
    else
      context(plural)
    end
    context("~")
    context.ref({"page"}, {label .. ":start"})
    if pagestart ~= pagestop then
      context("-")
      context.ref({"page"}, {label .. ":stop"})
    end
  end

  function userdata.printpagerange(label)
    userdata.printrange("page", "pages", label)
  end
}

\def\printpagerange#1{\ctxlua{userdata.printpagerange("#1")}}

\starttext

Tufte quote at \printpagerange{tufte}.

% start of quote reference
\pagereference[tufte:start]
\input{tufte}

%\page  % comment/uncomment this to toggle from page range to single
page

\input{tufte}
% end of quote reference
\pagereference[tufte:stop]

\stoptext


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