anchor.diff:        str_patterns = map (onPath readFile) (lib.toList file_str_patterns);
       in concatStringsSep "\n" str_patterns;
   
  -  gitignoreFilterPure = filter: patterns: root: name: type:
  -    gitignoreFilter (gitignoreCompileIgnore patterns root) root name type
  -    && filter name type;
  +  gitignoreFilterPure = filter: patterns: root: let
  +    compiledFilter = gitignoreCompileIgnore patterns root;
  +    filterFn = gitignoreFilter compiledFilter;
  +  in name: type: filterFn root name type && filter name type;
   
     # This is a very hacky way of programming this!
     # A better way would be to reuse existing filtering by making multiple gitignore functions per each root.
  
positive.code:       (filter (l: !isList l && !isComment l)
        (split "\n" gitignore));
  
    gitignoreFilter = ign: root: filterPattern (gitignoreToPatterns ign) root;
  
    # string|[string|file] (→ [string|file] → [string]) -> string
    gitignoreCompileIgnore = file_str_patterns: root:
  
negative.code: in rec {
    # [["good/relative/source/file" true] ["bad.tmpfile" false]] -> root -> path
    filterPattern = patterns: root:
      let
        filters = map (pair: relPath: if match (head pair) relPath == null then true else last pair) patterns;
      in
        name: _type:
          let
            relPath = lib.removePrefix ((toString root) + "/") name;
          in foldl' (acc: f: if acc == true then f relPath else acc) true filters;
  
    # string -> [[regex bool]]
    gitignoreToPatterns = gitignore:
  