Sprite sheets mostly working; remains a glitch with some larger ones

TODO.md

@@ -5,6 +5,8 @@ A list of things that need to be done; consider opening a pull request with one
 - Storage/production is implemented for few if any of the file formats, eg, archiving files into an AFS
 - Extraction for some of the containers is slow; in some cases it may just be better to load them into memory, perhaps deciding based on `File.stat`
   - This also could be a matter of read size, but this too will require some cleverness
+- There are recurring patterns around image tiles that can be abstracted
+  - At the very least, basic helpers like padding with `<<0>>` on sides can be turned into general utility functions
 
 ## Lim.ex
 - Does not handle multiple palettes

lib/lim.ex

@@ -217,8 +217,13 @@ defmodule Lim do
       |> Png.with_color_type(info.palette_data.palettes |> Enum.to_list()) # need to actually handle multiple palettes someday~
       |> Png.execute(pixel_data)
         do
-          {:ok, png_data} -> File.write(output_file_name, png_data <> <<>>)
-          {:error, err} -> IO.puts(err)
+          {:ok, png_data} -> 
+            case File.write(output_file_name, png_data <> <<>>) do
+              :ok -> {:ok, png_data}
+              err -> err
+            end
+          {:error, err} -> 
+            {:error, err}
         end
 
   end