use crate::{
command::{CommandArg, CommandItem},
InvokeError, Runtime,
};
use state::Container;
pub struct State<'r, T: Send + Sync + 'static>(&'r T);
impl<'r, T: Send + Sync + 'static> State<'r, T> {
#[inline(always)]
pub fn inner(&self) -> &'r T {
self.0
}
}
impl<T: Send + Sync + 'static> std::ops::Deref for State<'_, T> {
type Target = T;
#[inline(always)]
fn deref(&self) -> &T {
self.0
}
}
impl<T: Send + Sync + 'static> Clone for State<'_, T> {
fn clone(&self) -> Self {
State(self.0)
}
}
impl<'r, T: Send + Sync + std::fmt::Debug> std::fmt::Debug for State<'r, T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("State").field(&self.0).finish()
}
}
impl<'r, 'de: 'r, T: Send + Sync + 'static, R: Runtime> CommandArg<'de, R> for State<'r, T> {
fn from_command(command: CommandItem<'de, R>) -> Result<Self, InvokeError> {
Ok(command.message.state_ref().try_get().unwrap_or_else(|| {
panic!(
"state not managed for field `{}` on command `{}`. You must call `.manage()` before using this command",
command.key, command.name
)
}))
}
}
#[derive(Debug)]
pub struct StateManager(pub(crate) Container![Send + Sync]);
impl StateManager {
pub(crate) fn new() -> Self {
Self(<Container![Send + Sync]>::new())
}
pub(crate) fn set<T: Send + Sync + 'static>(&self, state: T) -> bool {
self.0.set(state)
}
pub fn get<T: Send + Sync + 'static>(&self) -> State<'_, T> {
State(
self
.0
.try_get()
.expect("state: get() called before set() for given type"),
)
}
pub fn try_get<T: Send + Sync + 'static>(&self) -> Option<State<'_, T>> {
self.0.try_get().map(State)
}
}