use editor::Editor;use gpui::{div, IntoElement, ParentElement, Render, Subscription, View, ViewContext, WeakView};use std::sync::Arc;use ui::{Button, ButtonCommon, Clickable, FluentBuilder, LabelSize, Tooltip};use workspace::{item::ItemHandle, StatusItemView, Workspace}; use crate::LanguageSelector; pub struct ActiveBufferLanguage {    active_language: Option<Option<Arc<str>>>,    workspace: WeakView<Workspace>,    _observe_active_editor: Option<Subscription>,} impl ActiveBufferLanguage {    pub fn new(workspace: &Workspace) -> Self {        Self {            active_language: None,            workspace: workspace.weak_handle(),            _observe_active_editor: None,        }    }     fn update_language(&mut self, editor: View<Editor>, cx: &mut ViewContext<Self>) {        self.active_language = Some(None);         let editor = editor.read(cx);        if let Some((_, buffer, _)) = editor.active_excerpt(cx) {            if let Some(language) = buffer.read(cx).language() {                self.active_language = Some(Some(language.name()));            }        }         cx.notify();    }} impl Render for ActiveBufferLanguage {    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {        div().when_some(self.active_language.as_ref(), |el, active_language| {            let active_language_text = if let Some(active_language_text) = active_language {                active_language_text.to_string()            } else {                "Unknown".to_string()            };             el.child(                Button::new("change-language", active_language_text)                    .label_size(LabelSize::Small)                    .on_click(cx.listener(|this, _, cx| {                        if let Some(workspace) = this.workspace.upgrade() {                            workspace.update(cx, |workspace, cx| {                                LanguageSelector::toggle(workspace, cx)                            });                        }                    }))                    .tooltip(|cx| Tooltip::text("Select Language", cx)),            )        })    }} impl StatusItemView for ActiveBufferLanguage {    fn set_active_pane_item(        &mut self,        active_pane_item: Option<&dyn ItemHandle>,        cx: &mut ViewContext<Self>,    ) {        if let Some(editor) = active_pane_item.and_then(|item| item.act_as::<Editor>(cx)) {            self._observe_active_editor = Some(cx.observe(&editor, Self::update_language));            self.update_language(editor, cx);        } else {            self.active_language = None;            self._observe_active_editor = None;        }         cx.notify();    }}