use std::sync::Arc; use collections::{BTreeSet, HashMap};use derive_more::{Deref, DerefMut};use gpui::Global;use gpui::{AppContext, ReadGlobal};use parking_lot::RwLock; use crate::SlashCommand; #[derive(Default, Deref, DerefMut)]struct GlobalSlashCommandRegistry(Arc<SlashCommandRegistry>); impl Global for GlobalSlashCommandRegistry {} #[derive(Default)]struct SlashCommandRegistryState {    commands: HashMap<Arc<str>, Arc<dyn SlashCommand>>,    featured_commands: BTreeSet<Arc<str>>,} #[derive(Default)]pub struct SlashCommandRegistry {    state: RwLock<SlashCommandRegistryState>,} impl SlashCommandRegistry {    /// Returns the global [`SlashCommandRegistry`].    pub fn global(cx: &AppContext) -> Arc<Self> {        GlobalSlashCommandRegistry::global(cx).0.clone()    }     /// Returns the global [`SlashCommandRegistry`].    ///    /// Inserts a default [`SlashCommandRegistry`] if one does not yet exist.    pub fn default_global(cx: &mut AppContext) -> Arc<Self> {        cx.default_global::<GlobalSlashCommandRegistry>().0.clone()    }     pub fn new() -> Arc<Self> {        Arc::new(Self {            state: RwLock::new(SlashCommandRegistryState {                commands: HashMap::default(),                featured_commands: BTreeSet::default(),            }),        })    }     /// Registers the provided [`SlashCommand`].    pub fn register_command(&self, command: impl SlashCommand, is_featured: bool) {        let mut state = self.state.write();        let command_name: Arc<str> = command.name().into();        if is_featured {            state.featured_commands.insert(command_name.clone());        }        state.commands.insert(command_name, Arc::new(command));    }     /// Unregisters the provided [`SlashCommand`].    pub fn unregister_command(&self, command: impl SlashCommand) {        self.unregister_command_by_name(command.name().as_str())    }     /// Unregisters the command with the given name.    pub fn unregister_command_by_name(&self, command_name: &str) {        let mut state = self.state.write();        state.featured_commands.remove(command_name);        state.commands.remove(command_name);    }     /// Returns the names of registered [`SlashCommand`]s.    pub fn command_names(&self) -> Vec<Arc<str>> {        self.state.read().commands.keys().cloned().collect()    }     /// Returns the names of registered, featured [`SlashCommand`]s.    pub fn featured_command_names(&self) -> Vec<Arc<str>> {        self.state            .read()            .featured_commands            .iter()            .cloned()            .collect()    }     /// Returns the [`SlashCommand`] with the given name.    pub fn command(&self, name: &str) -> Option<Arc<dyn SlashCommand>> {        self.state.read().commands.get(name).cloned()    }}