Recognize indentation level

The plugin now recognizes indentation level and will write the comments
at the same indentation level as the function.
for example:

function()
    -- this is junk
    -- this is junk

    -- The annotation will be created here
    function()
    end
    -- this is junk
    -- this is junk
end

lua/neogen.lua

@@ -1,5 +1,4 @@
 local ts_utils = require("nvim-treesitter.ts_utils")
-local ts_query  = require("nvim-treesitter.query")
 
 local M = {}
 
@@ -21,6 +20,12 @@ M.generate = function ()
     end
     local line = ts_utils.get_node_range(function_node)
 
+    -- find the starting position in the line function
+    local line_content = vim.api.nvim_buf_get_lines(0, line, line+1, false)[1]
+    local offset = line_content:match("^%s+") or ""
+
+    local return_comment = offset .. "---@return "
+    local param_comment = offset .. "---@param "
 
     -- Parse and iterate over each found query
     local returned = vim.treesitter.parse_query("lua", query)
@@ -31,18 +36,18 @@ M.generate = function ()
             local params = ts_utils.get_node_text(node)[1]:sub(2,-2)
             for p in string.gmatch(params, '[^,]+') do
                 p = p:gsub("%s+", "") -- remove trailing spaces
-                table.insert(comment, "---@param " .. p .. " ")
+                table.insert(comment, param_comment .. p .. " ")
             end
         end
 
         -- Try to add return statement
         if returned.captures[id] == "return" then
-            table.insert(comment, "---@return ")
+            table.insert(comment, return_comment)
         end
     end
 
     -- At the end, add description annotation
-    table.insert(comment, 1, "---")
+    table.insert(comment, 1, offset .. "---")
 
     if #comment == 0 then return end
 
@@ -50,7 +55,6 @@ M.generate = function ()
     vim.fn.append(line, comment)
     vim.fn.cursor(line+1, #comment[1])
     vim.api.nvim_command('startinsert!')
-
 end
 
 function M.generate_command()