PDF support

[hyperstown]

Hi, just as title says I was wondering if it would be possible to add PDF support? ImageMagick supports converting pdf to image and it does it quite fast.
I made a simple proof of concept based on autocommands to show that it currently works but it would be nice to have this build in.

The code:

local function attach_image_lifecycle(buf, img)
  if vim.b[buf].image_lifecycle_attached then return end

  vim.b[buf].image_lifecycle_attached = true

  vim.api.nvim_create_autocmd({ "BufLeave", "BufWipeout", "BufUnload" }, {
    buffer = buf,
    callback = function()
      if img then img:clear() end
    end,
  })
  vim.api.nvim_create_autocmd("BufWinEnter", {
    buffer = buf,
    callback = function()
      if img then img:render() end
    end,
  })
end

vim.api.nvim_create_autocmd("BufReadPost", {
  pattern = "*.pdf",
  callback = function(args)
    local buf = args.buf
    local win = vim.api.nvim_get_current_win()
    local png = vim.fn.tempname() .. ".jpg"

    vim.fn.system {
      "magick",
      "-density",
      "150",
      args.file .. "[0]",
      png,
    }

    vim.bo[buf].swapfile = false
    vim.bo[buf].buftype = "nofile"
    vim.bo[buf].filetype = "image"
    vim.bo[buf].modifiable = true
    vim.bo[buf].readonly = false

    vim.api.nvim_buf_set_lines(buf, 0, -1, false, {})

    vim.wo[win].number = false
    vim.wo[win].relativenumber = false
    vim.wo[win].signcolumn = "no"
    vim.wo[win].cursorline = false

    image.clear()

    local img = image.from_file(png, {
      window = win,
      inline = true,
    })
    if not img then return end

    img:render()

    vim.b[buf].pdf_img = img

    vim.schedule(function()
      if vim.api.nvim_buf_is_valid(buf) then
        vim.bo[buf].modifiable = false
        vim.bo[buf].readonly = true
      end
    end)

    attach_image_lifecycle(buf, img)
  end,
})