diff --git a/lua/nvim-surround/buffer.lua b/lua/nvim-surround/buffer.lua
index ebdedc0..48ea205 100644
--- a/lua/nvim-surround/buffer.lua
+++ b/lua/nvim-surround/buffer.lua
@@ -150,17 +150,6 @@ M.get_line = function(line_num)
     return M.get_lines(line_num, line_num)[1]
 end
 
--- Formats a set of lines from the buffer, inclusive and 1-indexed.
----@param start integer The starting line.
----@param stop integer The final line.
-M.format_lines = function(start, stop)
-    local b = vim.bo
-    -- Only format if a formatter is set up already
-    if start <= stop and (b.equalprg ~= "" or b.indentexpr ~= "" or b.cindent or b.smartindent or b.lisp) then
-        vim.cmd(string.format("silent normal! %dG=%dG", start, stop))
-    end
-end
-
 -- Returns whether a position comes before another in a buffer, true if the positions are the same.
 ---@param pos1 integer[] The first position.
 ---@param pos2 integer[] The second position.
diff --git a/lua/nvim-surround/config.lua b/lua/nvim-surround/config.lua
index 98ddf14..24a11a9 100644
--- a/lua/nvim-surround/config.lua
+++ b/lua/nvim-surround/config.lua
@@ -258,6 +258,13 @@ M.default_opts = {
         duration = 0,
     },
     move_cursor = "begin",
+    indent_lines = function(start, stop)
+        local b = vim.bo
+        -- Only re-indent the selection if a formatter is set up already
+        if start <= stop and (b.equalprg ~= "" or b.indentexpr ~= "" or b.cindent or b.smartindent or b.lisp) then
+            vim.cmd(string.format("silent normal! %dG=%dG", start, stop))
+        end
+    end,
 }
 
 --[====================================================================================================================[
diff --git a/lua/nvim-surround/init.lua b/lua/nvim-surround/init.lua
index 8514951..336255d 100644
--- a/lua/nvim-surround/init.lua
+++ b/lua/nvim-surround/init.lua
@@ -18,6 +18,7 @@
 ---@field aliases table<string, boolean|string|string[]>
 ---@field highlight { duration: boolean|integer }
 ---@field move_cursor boolean|string
+---@field indent_lines boolean|function
 
 local buffer = require("nvim-surround.buffer")
 local cache = require("nvim-surround.cache")
@@ -40,8 +41,8 @@ end
 
 -- Add delimiters around the cursor, in insert mode.
 M.insert_surround = function(line_mode)
-    local char = utils.get_char()
     local curpos = buffer.get_curpos()
+    local char = utils.get_char()
     local delimiters = utils.get_delimiters(char)
     if not delimiters then
         return
@@ -55,14 +56,19 @@ M.insert_surround = function(line_mode)
 
     buffer.insert_text(curpos, delimiters[2])
     buffer.insert_text(curpos, delimiters[1])
-    buffer.format_lines(curpos[1], curpos[1] + #delimiters[1] + #delimiters[2] - 2)
     buffer.set_curpos({ curpos[1] + #delimiters[1] - 1, curpos[2] + #delimiters[1][#delimiters[1]] })
     -- Indent the cursor to the correct level, if added line-wise
-    if line_mode then
-        local lnum = buffer.get_curpos()[1]
-
-        vim.cmd(lnum .. "left " .. vim.fn.indent(lnum + 1) + vim.fn.shiftwidth())
-        buffer.set_curpos({ lnum, #buffer.get_line(lnum) + 1 })
+    local indent_lines = config.get_opts().indent_lines
+    if indent_lines then
+        curpos = buffer.get_curpos()
+        indent_lines(curpos[1], curpos[1] + #delimiters[1] + #delimiters[2] - 2)
+        buffer.set_curpos(curpos)
+        if line_mode then
+            local lnum = buffer.get_curpos()[1]
+            vim.pretty_print(lnum)
+            vim.cmd(lnum .. "left " .. vim.fn.indent(lnum + 1) + vim.fn.shiftwidth())
+            buffer.set_curpos({ lnum, #buffer.get_line(lnum) + 1 })
+        end
     end
 end
 
@@ -149,7 +155,9 @@ M.visual_surround = function(line_mode)
         buffer.insert_text(first_pos, delimiters[1])
     end
 
-    buffer.format_lines(first_pos[1], last_pos[1] + #delimiters[1] + #delimiters[2] - 2)
+    if config.get_opts().indent_lines then
+        config.get_opts().indent_lines(first_pos[1], last_pos[1] + #delimiters[1] + #delimiters[2] - 2)
+    end
     buffer.reset_curpos(curpos)
 end
 
@@ -173,10 +181,12 @@ M.delete_surround = function(args)
         -- Delete the right selection first to ensure selection positions are correct
         buffer.delete_selection(selections.right)
         buffer.delete_selection(selections.left)
-        buffer.format_lines(
-            selections.left.first_pos[1],
-            selections.left.first_pos[1] + selections.right.first_pos[1] - selections.left.last_pos[1]
-        )
+        if config.get_opts().indent_lines then
+            config.get_opts().indent_lines(
+                selections.left.first_pos[1],
+                selections.left.first_pos[1] + selections.right.first_pos[1] - selections.left.last_pos[1]
+            )
+        end
         buffer.set_curpos(selections.left.first_pos)
     end