function note(el)
    el.classes = pandoc.List()
    el.classes:insert("c-note")
    return el
end

function gallery(el)
    el.classes = pandoc.List()
    el.classes:insert("c-gallery")

    local cur = pandoc.Div(pandoc.List(), { class = "c-gallery__current" })
    local imageList = pandoc.Div(pandoc.List(), { class = "c-gallery__items" })

    pandoc.walk_block(el, {
        Image = function(iel)
            iel.classes = pandoc.List()
            iel.classes:insert("c-gallery__img")

            local lel = pandoc.Link(iel, iel.src)
            lel.classes = pandoc.List()
            lel.classes:insert("c-gallery__item")

            imageList.content:insert(lel)
        end,
    })

    el.content = { cur, imageList }

    return el
end

function Div(el)
    if el.classes:includes("note") then
        el = note(el)
    elseif el.classes:includes("gallery") then
        el = gallery(el)
    end

    return el
end