Easy and cool auto formatter/prettier implementation for neovim's init.lua

nvim_format.lua

Format = function()
  vim.api.nvim_command(":w") -- save first
  
  local formatCmds = { -- these are just commands that formatting files next to them 'in-place' for each filetype
    lua = 'lua-format --indent-width=2 --spaces-inside-table-braces -i',
    go = 'gofmt -w',
    javascript = 'prettier -w --loglevel error',
    typescript = 'prettier -w --loglevel error',
    javascriptreact = 'prettier -w --loglevel error',
    typescriptreact = 'prettier -w --loglevel error',
    json = 'prettier -w --loglevel error',
    css = 'prettier -w --loglevel error',
    scss = 'prettier -w --loglevel error',
    cmake = 'cmake-format -i',
    c = 'clang-format -style=file -i',
    cpp = 'clang-format -style=file -i',
    markdown = 'prettier -w --prose-wrap always --loglevel error',
    python = 'black -q'
  }

  local cmd = formatCmds[vim.bo.filetype] or 'sed -i -e "s/\\s\\+$//"' -- set command or sed trailing whitespace if not specified
  local f = io.popen(cmd .. ' "' .. vim.api.nvim_buf_get_name("%") .. '" 2>&1')
  print(f:read('*all')) -- error to status to know what the fuck happened
  f:close()
  vim.api.nvim_command("let tmp = winsaveview()")
  vim.api.nvim_command("e!") -- these three are reloading buffer saving your window's view
  vim.api.nvim_command("call winrestview(tmp)")
  vim.api.nvim_command("IndentBlanklineRefresh") -- this is for a plugin 'blankline', remove it if don't have it
  -- and other refreshing stuff if needed
end

-- now map the key, gonna exec vimscript for simplicity
vim.exec('map <silent> <leader>F :lua Format()<CR>')