lab7-patterns

Lab #7. Design patterns

Oleksii Filonenko, PP-42

Facade pattern

// src/main.rs:10
// CLI subcommand is delegated to a submodule

match app.command {
    Command::Init(options) => init::init(&options)?,
    Command::New(options) => new::new(&options)?,
    Command::Build => build::build()?,
};

Single responsibility principle

// src/init.rs
// Each module is responsible for a single use case, takes own parameter object, etc.

pub fn init(Options { site_dir }: &init::Options) -> Result<(), Error> {

    // ...

}

(almost) applicable to Rust code

Each module (function + options struct) could be make into a Command, but according to YAGNI, I did not :)