Dispatch

Dispatch is a sub-command dispatcher.

You've probably seen CLI programs that have many subcommands. For example with cargo itself has sub commands like build, check, clean, etc.

Dispatch is a library that lets you easily add subcommands like this in your programs.

Usage

// Define a function for your subcommand which returns the type Result<i32, Box<dyn Error>>
fn subcommand() -> CommandResult {
    Ok(0)
}

// Create the dispatcher
let mut dispatcher = Dispatcher::new();

// Register your subcommands
dispatcher.register(Command { name: "subcommand", help: "My first subcommand", function: subcommand});

// Print help message to console
dispatcher.print_help();

// Execute sub command by name
dispatcher.run("subcommand")

More information

All subcommands return the type CommandResult which maps to Result<i32, Box<dyn Error>>. This allows your subcommands to readily use rust's built-in ? error checking syntax. The i32 is intended to be the return status or exit code of your subcommand. To me, this is what main would return as the program's exit status, though you could use it however you like.

You are still responsible for checking the input arguments and executing the subcommands as needed.