nvim/lua/config/black.lua

vim.api.nvim_create_autocmd( { "BufWritePre" }, {
  pattern = { "*.py", "*.pyi" },
  callback = function(ev)
    local old_cursor = vim.api.nvim_win_get_cursor(0)
    vim.api.nvim_command([[ :silent! %!/usr/bin/env black -q --stdin-filename % - ]])
    local new_cursor = vim.api.nvim_win_get_cursor(0)

    if old_cursor[1] ~= new_cursor[1] or old_cursor[2] ~= new_cursor[2] then
      vim.cmd.normal(vim.api.nvim_replace_termcodes('<C-o>', true, true, true))
    end
  end
})