✨ feat(nvim): add shfmt formatter

.config/nvim/lua/plugins/extras/formatting/shfmt.lua

@@ -0,0 +1,29 @@
+return {
+  {
+    "stevearc/conform.nvim",
+    opts = function(_, opts)
+      local function add_formatters(tbl)
+        for ft, formatters in pairs(tbl) do
+          if opts.formatters_by_ft[ft] == nil then
+            opts.formatters_by_ft[ft] = formatters
+          else
+            vim.list_extend(opts.formatters_by_ft[ft], formatters)
+          end
+        end
+      end
+
+      add_formatters({
+        ["sh"] = { "shfmt" },
+        ["bash"] = { "shfmt" },
+        ["zsh"] = { "shfmt" },
+      })
+    end,
+  },
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, { "shfmt" })
+    end,
+  },
+}