\pageref{} does not work for hypertargets; this is a work-around

\pageref{} does not work for hypertargets; this is a work-around

[rauschma-Re5JQEeQqe8AvxtiuMwx3w]

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Problem: The \pageref{} at the end does not work. IDs for headings work 
just fine. (I’m using \pageref{} internally, via a filter, for the print 
version of my book.)

[Bla bla bla.]{#foo}
···
For more information, consult \pageref{foo}.


Solution:

\multilabel{foo} Bla bla bla.
···
For more information, consult \pageref{foo}.


Lua filter that implements \multilabel{}. Feedback welcome.

-- Problem: \pageref{} does not work with \hypertarget{}
-- Work-around: \phantomsection\label{foo}\hypertarget{foo}{}
-- 
https://tex.stackexchange.com/questions/376805/the-page-number-of-a-hypertarget
function RawInline(el)
if (el.format == "tex") then
local inner = string.match(el.text, "\\multilabel{([^{}]*)}")
if (inner ~= nil) then
if FORMAT == "latex" then
return pandoc.RawInline("tex", "\\phantomsection\\label{" .. inner .. 
"}\\hypertarget{" .. inner .. "}{}")
else
return pandoc.Span(
{pandoc.Str("")}, -- list of inlines
pandoc.Attr(inner)
)
end
end
end
return nil -- no change
end

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Re: \pageref{} does not work for hypertargets; this is a work-around

[rauschma-Re5JQEeQqe8AvxtiuMwx3w]

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I thought a LaTeX command was convenient, but it turns out that a span is 
better (can be used in more situations). New filter:

-- Problem: \pageref{} does not work with \hypertarget{}
-- Work-around: \phantomsection\label{foo}\hypertarget{foo}{}
-- 
https://tex.stackexchange.com/questions/376805/the-page-number-of-a-hypertarget

function Span(span)
if span.attr.classes:includes("texlabel") then
-- This check is useful even if FORMAT ~= "latex"
if span.attr.identifier == "" then
error("Missing ID (starts with a #hash)")
end
if FORMAT ~= "latex" then
return nil
end
return {
pandoc.RawInline("tex", "\\phantomsection\\label{" .. span.attr.identifier 
.. "}"), -- for \pageref{}
span -- for hyperlinks
}
end
return nil -- no change
end


Used as follows:

[Hoisting]{#hoisting .texlabel} is an important term in this context.

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