Programming Elixir ≥ 1.6

Transformation: Parse the Command Line

Let’s start with the command line. We really don’t want to couple the handling of command-line options into the main body of our program, so let’s write a separate module to interface between what the user types and what our program does. By convention this module is called Project.CLI (so our code would be in Issues.CLI). Also by convention, the main entry point to this module will be a function called run that takes an array of command-line arguments.

Where should we put this module?

Elixir has a convention. Inside the lib/ directory, create a subdirectory with the same name as the project (so we’d create the directory lib/issues/). This directory will contain the main source for our application, one ...