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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