Don't replace extension when copying a file (#105)

* Don't replace extension when copying a file

* refactor: simplify logic

---------

Co-authored-by: Håkon Harnes <[email protected]>

Author: baroldgene

lua/img-clip/paste.lua

@@ -119,7 +119,12 @@ M.paste_image_from_path = function(src_path)
     return true
   end
 
-  local extension = config.get_opt("extension")
+  local extension = vim.fn.fnamemodify(src_path, ":e")
+  if extension == "" then
+    util.warn("File missing extension. Adding png.")
+    extension = config.get_opt("extension")
+  end
+
   local file_path = fs.get_file_path(extension)
   if not file_path then
     util.error("Could not determine file path.")