mod active_buffer_language; pub use active_buffer_language::ActiveBufferLanguage;use anyhow::Context as _;use editor::Editor;use file_finder::file_finder_settings::FileFinderSettings;use file_icons::FileIcons;use fuzzy::{StringMatch, StringMatchCandidate, match_strings};use gpui::{    App, Context, DismissEvent, Entity, EventEmitter, FocusHandle, Focusable, ParentElement,    Render, Styled, WeakEntity, Window, actions,};use language::{Buffer, LanguageMatcher, LanguageName, LanguageRegistry};use picker::{Picker, PickerDelegate};use project::Project;use settings::Settings;use std::{ops::Not as _, path::Path, sync::Arc};use ui::{HighlightedLabel, ListItem, ListItemSpacing, prelude::*};use util::ResultExt;use workspace::{ModalView, Workspace}; actions!(language_selector, [Toggle]); pub fn init(cx: &mut App) {    cx.observe_new(LanguageSelector::register).detach();} pub struct LanguageSelector {    picker: Entity<Picker<LanguageSelectorDelegate>>,} impl LanguageSelector {    fn register(        workspace: &mut Workspace,        _window: Option<&mut Window>,        _: &mut Context<Workspace>,    ) {        workspace.register_action(move |workspace, _: &Toggle, window, cx| {            Self::toggle(workspace, window, cx);        });    }     fn toggle(        workspace: &mut Workspace,        window: &mut Window,        cx: &mut Context<Workspace>,    ) -> Option<()> {        let registry = workspace.app_state().languages.clone();        let (_, buffer, _) = workspace            .active_item(cx)?            .act_as::<Editor>(cx)?            .read(cx)            .active_excerpt(cx)?;        let project = workspace.project().clone();         workspace.toggle_modal(window, cx, move |window, cx| {            LanguageSelector::new(buffer, project, registry, window, cx)        });        Some(())    }     fn new(        buffer: Entity<Buffer>,        project: Entity<Project>,        language_registry: Arc<LanguageRegistry>,        window: &mut Window,        cx: &mut Context<Self>,    ) -> Self {        let delegate = LanguageSelectorDelegate::new(            cx.entity().downgrade(),            buffer,            project,            language_registry,        );         let picker = cx.new(|cx| Picker::uniform_list(delegate, window, cx));        Self { picker }    }} impl Render for LanguageSelector {    fn render(&mut self, _window: &mut Window, _cx: &mut Context<Self>) -> impl IntoElement {        v_flex().w(rems(34.)).child(self.picker.clone())    }} impl Focusable for LanguageSelector {    fn focus_handle(&self, cx: &App) -> FocusHandle {        self.picker.focus_handle(cx)    }} impl EventEmitter<DismissEvent> for LanguageSelector {}impl ModalView for LanguageSelector {} pub struct LanguageSelectorDelegate {    language_selector: WeakEntity<LanguageSelector>,    buffer: Entity<Buffer>,    project: Entity<Project>,    language_registry: Arc<LanguageRegistry>,    candidates: Vec<StringMatchCandidate>,    matches: Vec<StringMatch>,    selected_index: usize,} impl LanguageSelectorDelegate {    fn new(        language_selector: WeakEntity<LanguageSelector>,        buffer: Entity<Buffer>,        project: Entity<Project>,        language_registry: Arc<LanguageRegistry>,    ) -> Self {        let candidates = language_registry            .language_names()            .into_iter()            .filter_map(|name| {                language_registry                    .available_language_for_name(&name)?                    .hidden()                    .not()                    .then_some(name)            })            .enumerate()            .map(|(candidate_id, name)| StringMatchCandidate::new(candidate_id, &name))            .collect::<Vec<_>>();         Self {            language_selector,            buffer,            project,            language_registry,            candidates,            matches: vec![],            selected_index: 0,        }    }     fn language_data_for_match(&self, mat: &StringMatch, cx: &App) -> (String, Option<Icon>) {        let mut label = mat.string.clone();        let buffer_language = self.buffer.read(cx).language();        let need_icon = FileFinderSettings::get_global(cx).file_icons;         if let Some(buffer_language) = buffer_language            .filter(|buffer_language| buffer_language.name().as_ref() == mat.string.as_str())        {            label.push_str(" (current)");            let icon = need_icon                .then(|| self.language_icon(&buffer_language.config().matcher, cx))                .flatten();            (label, icon)        } else {            let icon = need_icon                .then(|| {                    let language_name = LanguageName::new(mat.string.as_str());                    self.language_registry                        .available_language_for_name(language_name.as_ref())                        .and_then(|available_language| {                            self.language_icon(available_language.matcher(), cx)                        })                })                .flatten();            (label, icon)        }    }     fn language_icon(&self, matcher: &LanguageMatcher, cx: &App) -> Option<Icon> {        matcher            .path_suffixes            .iter()            .find_map(|extension| FileIcons::get_icon(Path::new(extension), cx))            .map(Icon::from_path)            .map(|icon| icon.color(Color::Muted))    }} impl PickerDelegate for LanguageSelectorDelegate {    type ListItem = ListItem;     fn placeholder_text(&self, _window: &mut Window, _cx: &mut App) -> Arc<str> {        "Select a language…".into()    }     fn match_count(&self) -> usize {        self.matches.len()    }     fn confirm(&mut self, _: bool, window: &mut Window, cx: &mut Context<Picker<Self>>) {        if let Some(mat) = self.matches.get(self.selected_index) {            let language_name = &self.candidates[mat.candidate_id].string;            let language = self.language_registry.language_for_name(language_name);            let project = self.project.downgrade();            let buffer = self.buffer.downgrade();            cx.spawn_in(window, async move |_, cx| {                let language = language.await?;                let project = project.upgrade().context("project was dropped")?;                let buffer = buffer.upgrade().context("buffer was dropped")?;                project.update(cx, |project, cx| {                    project.set_language_for_buffer(&buffer, language, cx);                })            })            .detach_and_log_err(cx);        }        self.dismissed(window, cx);    }     fn dismissed(&mut self, _: &mut Window, cx: &mut Context<Picker<Self>>) {        self.language_selector            .update(cx, |_, cx| cx.emit(DismissEvent))            .log_err();    }     fn selected_index(&self) -> usize {        self.selected_index    }     fn set_selected_index(        &mut self,        ix: usize,        _window: &mut Window,        _: &mut Context<Picker<Self>>,    ) {        self.selected_index = ix;    }     fn update_matches(        &mut self,        query: String,        window: &mut Window,        cx: &mut Context<Picker<Self>>,    ) -> gpui::Task<()> {        let background = cx.background_executor().clone();        let candidates = self.candidates.clone();        cx.spawn_in(window, async move |this, cx| {            let matches = if query.is_empty() {                candidates                    .into_iter()                    .enumerate()                    .map(|(index, candidate)| StringMatch {                        candidate_id: index,                        string: candidate.string,                        positions: Vec::new(),                        score: 0.0,                    })                    .collect()            } else {                match_strings(                    &candidates,                    &query,                    false,                    100,                    &Default::default(),                    background,                )                .await            };             this.update(cx, |this, cx| {                let delegate = &mut this.delegate;                delegate.matches = matches;                delegate.selected_index = delegate                    .selected_index                    .min(delegate.matches.len().saturating_sub(1));                cx.notify();            })            .log_err();        })    }     fn render_match(        &self,        ix: usize,        selected: bool,        _: &mut Window,        cx: &mut Context<Picker<Self>>,    ) -> Option<Self::ListItem> {        let mat = &self.matches[ix];        let (label, language_icon) = self.language_data_for_match(mat, cx);        Some(            ListItem::new(ix)                .inset(true)                .spacing(ListItemSpacing::Sparse)                .toggle_state(selected)                .start_slot::<Icon>(language_icon)                .child(HighlightedLabel::new(label, mat.positions.clone())),        )    }}