//! Provides hooks for customizing the behavior of the command palette. #![deny(missing_docs)] use std::{any::TypeId, rc::Rc}; use collections::{HashSet, TypeIdHashSet};use derive_more::{Deref, DerefMut};use gpui::{Action, App, BorrowAppContext, Global, Task, WeakEntity};use workspace::Workspace; /// Initializes the command palette hooks.pub fn init(cx: &mut App) {    cx.set_global(GlobalCommandPaletteFilter::default());} /// A filter for the command palette.#[derive(Default)]pub struct CommandPaletteFilter {    hidden_namespaces: HashSet<&'static str>,    hidden_action_types: TypeIdHashSet,    /// Actions that have explicitly been shown. These should be shown even if    /// they are in a hidden namespace.    shown_action_types: TypeIdHashSet,} #[derive(Deref, DerefMut, Default)]struct GlobalCommandPaletteFilter(CommandPaletteFilter); impl Global for GlobalCommandPaletteFilter {} impl CommandPaletteFilter {    /// Returns the global [`CommandPaletteFilter`], if one is set.    pub fn try_global(cx: &App) -> Option<&CommandPaletteFilter> {        cx.try_global::<GlobalCommandPaletteFilter>()            .map(|filter| &filter.0)    }     /// Returns a mutable reference to the global [`CommandPaletteFilter`].    pub fn global_mut(cx: &mut App) -> &mut Self {        cx.global_mut::<GlobalCommandPaletteFilter>()    }     /// Updates the global [`CommandPaletteFilter`] using the given closure.    pub fn update_global<F>(cx: &mut App, update: F)    where        F: FnOnce(&mut Self, &mut App),    {        if cx.has_global::<GlobalCommandPaletteFilter>() {            cx.update_global(|this: &mut GlobalCommandPaletteFilter, cx| update(&mut this.0, cx))        }    }     /// Returns whether the given [`Action`] is hidden by the filter.    pub fn is_hidden(&self, action: &dyn Action) -> bool {        let name = action.name();        let namespace = name.split("::").next().unwrap_or("malformed action name");         // If this action has specifically been shown then it should be visible.        if self.shown_action_types.contains(&action.type_id()) {            return false;        }         self.hidden_namespaces.contains(namespace)            || self.hidden_action_types.contains(&action.type_id())    }     /// Hides all actions in the given namespace.    pub fn hide_namespace(&mut self, namespace: &'static str) {        self.hidden_namespaces.insert(namespace);    }     /// Shows all actions in the given namespace.    pub fn show_namespace(&mut self, namespace: &'static str) {        self.hidden_namespaces.remove(namespace);    }     /// Hides all actions with the given types.    pub fn hide_action_types<'a>(&mut self, action_types: impl IntoIterator<Item = &'a TypeId>) {        for action_type in action_types {            self.hidden_action_types.insert(*action_type);            self.shown_action_types.remove(action_type);        }    }     /// Shows all actions with the given types.    pub fn show_action_types<'a>(&mut self, action_types: impl IntoIterator<Item = &'a TypeId>) {        for action_type in action_types {            self.shown_action_types.insert(*action_type);            self.hidden_action_types.remove(action_type);        }    }} /// The result of intercepting a command palette command.#[derive(Debug)]pub struct CommandInterceptItem {    /// The action produced as a result of the interception.    pub action: Box<dyn Action>,    /// The display string to show in the command palette for this result.    pub string: String,    /// The character positions in the string that match the query.    /// Used for highlighting matched characters in the command palette UI.    pub positions: Vec<usize>,} /// The result of intercepting a command palette command.#[derive(Default, Debug)]pub struct CommandInterceptResult {    /// The items    pub results: Vec<CommandInterceptItem>,    /// Whether or not to continue to show the normal matches    pub exclusive: bool,} /// An interceptor for the command palette.#[derive(Clone)]pub struct GlobalCommandPaletteInterceptor(    Rc<dyn Fn(&str, WeakEntity<Workspace>, &mut App) -> Task<CommandInterceptResult>>,); impl Global for GlobalCommandPaletteInterceptor {} impl GlobalCommandPaletteInterceptor {    /// Sets the global interceptor.    ///    /// This will override the previous interceptor, if it exists.    pub fn set(        cx: &mut App,        interceptor: impl Fn(&str, WeakEntity<Workspace>, &mut App) -> Task<CommandInterceptResult>        + 'static,    ) {        cx.set_global(Self(Rc::new(interceptor)));    }     /// Clears the global interceptor.    pub fn clear(cx: &mut App) {        if cx.has_global::<Self>() {            cx.remove_global::<Self>();        }    }     /// Intercepts the given query from the command palette.    pub fn intercept(        query: &str,        workspace: WeakEntity<Workspace>,        cx: &mut App,    ) -> Option<Task<CommandInterceptResult>> {        let interceptor = cx.try_global::<Self>()?;        let handler = interceptor.0.clone();        Some(handler(query, workspace, cx))    }}