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use super::Command;
use crate::runnable::Runnable;
use gumdrop::{Error, Opt, Options, Parser};
use std::marker::PhantomData;
#[derive(Debug, Default)]
pub struct Help<C: Command> {
pub opts: Vec<String>,
command: PhantomData<C>,
}
impl<C> Command for Help<C>
where
C: Command,
{
fn name() -> &'static str {
C::name()
}
fn description() -> &'static str {
C::description()
}
fn version() -> &'static str {
C::version()
}
fn authors() -> &'static str {
C::authors()
}
}
impl<C> Options for Help<C>
where
C: Command,
{
fn parse<S: AsRef<str>>(parser: &mut Parser<'_, S>) -> Result<Self, Error> {
let mut opts = vec![];
while let Some(opt) = parser.next_opt() {
match opt {
Opt::Free(free_opt) => opts.push(free_opt.to_owned()),
_ => return Err(Error::unexpected_argument(opt)),
}
}
Ok(Self {
opts,
command: PhantomData,
})
}
fn parse_command<S: AsRef<str>>(
_name: &str,
parser: &mut Parser<'_, S>,
) -> Result<Self, Error> {
Self::parse(parser)
}
fn usage() -> &'static str {
""
}
fn command_usage(_command: &str) -> Option<&'static str> {
None
}
fn command_list() -> Option<&'static str> {
None
}
}
impl<C> Runnable for Help<C>
where
C: Command,
{
fn run(&self) {
C::print_usage_and_exit(&self.opts);
}
}