local M = {}

local pdf_viewer_pid = 0

local compile = function(file)
  vim.fn.jobstart({ "compiledoc", file }, {
    on_exit = function() print("Finished compiling.") end
  })
end

M.open_document_preview = function()
  local filename = vim.api.nvim_buf_get_name(0)
  compile(filename)

  vim.api.nvim_create_augroup("compileDoc", {})

  vim.api.nvim_create_autocmd("BufWritePost", {
    group = "compileDoc",
    pattern = { "*.tex", "*.md" },
    callback = function() compile(filename) end
  })

  local pdf_filename = string.gsub(filename, "%..+$", ".pdf")
  pdf_viewer_pid = vim.fn.jobstart({ "zathura", pdf_filename })
end

M.close_document_preview = function()
  vim.api.nvim_del_augroup_by_name("compileDoc")
  if (pdf_viewer_pid ~= 0) then
    vim.fn.jobstop(pdf_viewer_pid)
  end
end

return M