In
p.96 – Ch 3 > Storing Graphs in the Graph Store > Using Macros
the code comment in graph.ex

quote do
   # other (listings, new_graph) functions here
   def read_graph...
   def write_graph...
end

implies the author will define a few more functions later, or WE will add them on our own.

On the following page (97), we’re told we can check out the whole NativeGraph library functions:

iex> NativeGraph.[TAB]
...

which includes ALL the functions it will eventually output when ALL are defined in the using macros in both GraphCommons.Graph and GraphCommons.Query

The author just needs to update this code snippet to correspond with the next paragraph in the book.

Through the end of Ch 3, I see only two more functions used:
list_graphs
list_graphs_dir

which I started defining in the next subsection, where first used:
p.100 – Ch 3 > Storing Graphs in the Graph Store > Listing

NOTE: I just noticed the author didn’t include these two functions in the source code either.

Here’s what I additionally wrote in my GraphCommons.Graph using macro

quote do

      def list_graphs(file_test \\ :exists?) do
         GraphCommons.Graph.list_graphs(unquote(graph_type), file_test)
      end

      def list_graphs_dir(graph_dir) do
         GraphCommons.Graph.list_graphs_dir(graph_dir, unquote(graph_type))
      end

   def read_graph...
   def write_graph...

end