nix-config/nvim/plugin/conform.lua

local conform = require "conform"

conform.setup {
  formatters_by_ft = {
    bash = { "shellcheck" },
    go = { "gofmt" },
    javascript = { "prettierd", "prettier", stop_after_first = true },
    just = { "just" },
    lua = { "stylua" },
    nix = { "nixfmt" },
    php = { "php_cs_fixer", "phpcbf", stop_after_first = true },
    terraform = { "terraform_fmt" },
    yaml = { "yamlfmt" },
  },

  format_on_save = function(bufnr)
    -- Disable with a global or buffer-local variable.
    if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then
      return
    end

    return {
      lsp_fallback = false,
      quiet = true,
    }
  end,
}

vim.api.nvim_create_user_command("FormatDisable", function(args)
  if args.bang then
    -- FormatDisable! will disable formatting just for this buffer
    vim.b.disable_autoformat = true
  else
    vim.g.disable_autoformat = true
  end
end, {
  desc = "Disable autoformat-on-save",
  bang = true,
})

vim.api.nvim_create_user_command("FormatEnable", function()
  vim.b.disable_autoformat = false
  vim.g.disable_autoformat = false
end, {
  desc = "Re-enable autoformat-on-save",
})