Summary
What we have essentially done in this chapter is build a program that accepts some command-line inputs, interacts with a file, and edits it depending on the command and data from that file. The data is simple: a title and a status. We could have done this all in the main function with multiple match statements and if, else if, and else blocks. However, this is not scalable. Instead, we built structs that inherited other structs, which then implemented traits. We then packaged the construction of these structs into a factory, enabling other files to use all that functionality in a single line of code.
We then built a processing interface so the command input, state, and struct could be processed, enabling us to stack on extra functionality and change the flow of the process with a few lines of code. Our main function must only focus on collecting the command-line arguments and coordinating when to call the module interfaces. We have now explored and utilized how Rust manages...
