local lspconf = {
  {
    pattern = {"*.rs"},
    options = {
      name = 'rust-analyzer',
      cmd = {'rustup', 'run', 'stable', 'rust-analyzer'},
      root_dir = vim.fs.dirname(vim.fs.find({'Cargo.toml'}, { upward = true })[1]),
    },
    format = true,
  }
}

for _, config in pairs(lspconf) do
  vim.api.nvim_create_autocmd("BufEnter", {
    pattern = config.pattern,
    callback = function()
      local client = vim.lsp.start(config.options)
      vim.lsp.buf_attach_client(0, client)
    end
  })
  if config.format then
    vim.api.nvim_create_autocmd("BufWritePre", {
      pattern = config.pattern,
      callback = function()
        vim.lsp.buf.format({ async = false })
      end
    })
  end
end

vim.api.nvim_create_autocmd('LspAttach', {
  callback = function(args)
    vim.keymap.set('n', '<leader>ld', vim.lsp.buf.definition)
    vim.keymap.set('n', '<leader>lr', vim.lsp.buf.references)
    vim.keymap.set('n', '<leader>li', vim.lsp.buf.implementation)
    vim.keymap.set('n', '<leader>lh', vim.lsp.buf.hover)
    vim.keymap.set('n', '<leader>ls', vim.lsp.buf.signature_help)
    vim.keymap.set('n', '<leader>lrn', vim.lsp.buf.rename)
  end,
})

vim.opt.completeopt = {"menu"}