@jcr - Brilliant, works like a charm. I had to make some trivial changes; the version I’m using right now with the LaTeX article or scrartcl classes is shown below.

One thing that would be nice to have, though, would be the ability to switch automatically between a 'commands' list for book-like LaTeX classes (starting with 'chapter'), and article-like classes (starting with 'section'). I'll be trying to figure that out, but useful hints would be welcome.

-- Print a formatted warning to stderr

function warnf (...)

  io.stderr:write(string.format(...))

end

function Header (el)

  -- Replace heading with raw LaTeX if pageheading is used to specify a

  -- shorter form of the title to use in page headers.

  if el.attributes.pageheading then

    -- local commands = {'chapter', 'section', 'subsection'}

    local commands = {'section', 'subsection'}

    if el.level > #commands then

      warnf('pageheading attribute not supported for level %d headings', el.level)

      return el

    end

    -- Produce LaTeX like pandoc does, but with two additional arguments

    -- to specify a short for of the page heading to memoir.

    local title = pandoc.utils.stringify(el)

    -- local latexStr = string.format('\\%s[%s][%s]{%s}', commands[el.level], title, el.attributes.pageheading, title)

    local latexStr = string.format('\\%s[%s]{%s}', commands[el.level], el.attributes.pageheading, title)

    local label = string.format('\\label{%s}', el.identifier)

    -- wrap in hypertarget

    latexStr = string.format('\\hypertarget{%s}{%%\n%s%s}', el.identifier, latexStr, label)

    return pandoc.RawBlock('latex', latexStr)

  end

end