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command.rs
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command.rs
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//! Application (sub)command(s), i.e. app entry points
#[doc(hidden)]
pub use abscissa_derive::Command;
use crate::{runnable::Runnable, terminal, Clap};
use std::fmt::Debug;
use termcolor::ColorChoice;
/// Subcommand of an application: derives or otherwise implements the `Options`
/// trait, but also has a `run()` method which can be used to invoke the given
/// (sub)command.
pub trait Command: Debug + Clap + Runnable {
/// Name of this program as a string
fn name() -> &'static str;
/// Description of this program
fn description() -> &'static str;
/// Authors of this program
fn authors() -> &'static str;
/// Parse command-line arguments from a string iterator
fn from_args<A: IntoIterator<Item = String>>(into_args: A) -> Self {
let args: Vec<_> = into_args.into_iter().collect();
Clap::try_parse_from(args.as_slice()).unwrap_or_else(|err| {
terminal::init(ColorChoice::Auto);
err.exit()
})
}
/// Parse command-line arguments from the environment
fn from_env_args() -> Self {
let args = ::std::env::args();
Self::from_args(args)
}
}
#[cfg(test)]
mod tests {
use crate::{Clap, Command, Runnable};
#[derive(Command, Debug, Clap)]
pub struct DummyCommand {}
impl Runnable for DummyCommand {
fn run(&self) {
panic!("unimplemented");
}
}
#[test]
fn derived_command_test() {
assert_eq!(DummyCommand::name(), "abscissa_core");
}
}