mod-cli 0.6.4

A fully customizable, feature-rich CLI framework for Rust. Define commands, prefixes, styled output, and more—built for flexibility and speed.
Documentation 
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use modcli::command::Command;
use modcli::error::ModCliError;
use modcli::loader::CommandRegistry;

#[test]
fn registry_try_execute_unknown_returns_error() {
    let reg = CommandRegistry::new();
    let err = reg.try_execute("does-not-exist", &[]).unwrap_err();
    match err {
        ModCliError::UnknownCommand(name) => assert_eq!(name, "does-not-exist"),
        other => panic!("expected UnknownCommand, got {other:?}"),
    }
}

#[derive(Default)]
struct InvalidCmd;

impl Command for InvalidCmd {
    fn name(&self) -> &str {
        "bad"
    }
    fn help(&self) -> Option<&str> {
        Some("Always invalid")
    }
    fn validate(&self, _args: &[String]) -> Result<(), ModCliError> {
        Err(ModCliError::InvalidUsage("invalid on purpose".into()))
    }
    fn execute(&self, _args: &[String]) {
        panic!("should not execute on invalid")
    }
}

#[test]
fn registry_try_execute_invalid_usage_returns_error() {
    let mut reg = CommandRegistry::new();
    reg.register(Box::new(InvalidCmd));
    let err = reg.try_execute("bad", &[]).unwrap_err();
    match err {
        ModCliError::InvalidUsage(msg) => assert!(msg.contains("invalid")),
        other => panic!("expected InvalidUsage, got {other:?}"),
    }
}