use std::sync::Arc;use std::time::Duration;use std::{ops::Range, path::PathBuf}; use anyhow::Result;use editor::scroll::{Autoscroll, AutoscrollStrategy};use editor::{Editor, EditorEvent};use gpui::{    list, App, ClickEvent, Context, Entity, EventEmitter, FocusHandle, Focusable,    InteractiveElement, IntoElement, ListState, ParentElement, Render, Styled, Subscription, Task,    WeakEntity, Window,};use language::LanguageRegistry;use ui::prelude::*;use workspace::item::{Item, ItemHandle};use workspace::{Pane, Workspace}; use crate::markdown_elements::ParsedMarkdownElement;use crate::OpenPreviewToTheSide;use crate::{    markdown_elements::ParsedMarkdown,    markdown_parser::parse_markdown,    markdown_renderer::{render_markdown_block, RenderContext},    OpenPreview,}; const REPARSE_DEBOUNCE: Duration = Duration::from_millis(200); pub struct MarkdownPreviewView {    workspace: WeakEntity<Workspace>,    active_editor: Option<EditorState>,    focus_handle: FocusHandle,    contents: Option<ParsedMarkdown>,    selected_block: usize,    list_state: ListState,    tab_description: Option<String>,    fallback_tab_description: SharedString,    language_registry: Arc<LanguageRegistry>,    parsing_markdown_task: Option<Task<Result<()>>>,} #[derive(Clone, Copy, Debug, PartialEq)]pub enum MarkdownPreviewMode {    /// The preview will always show the contents of the provided editor.    Default,    /// The preview will "follow" the currently active editor.    Follow,} struct EditorState {    editor: Entity<Editor>,    _subscription: Subscription,} impl MarkdownPreviewView {    pub fn register(workspace: &mut Workspace, _window: &mut Window, _cx: &mut Context<Workspace>) {        workspace.register_action(move |workspace, _: &OpenPreview, window, cx| {            if let Some(editor) = Self::resolve_active_item_as_markdown_editor(workspace, cx) {                let view = Self::create_markdown_view(workspace, editor, window, cx);                workspace.active_pane().update(cx, |pane, cx| {                    if let Some(existing_view_idx) = Self::find_existing_preview_item_idx(pane) {                        pane.activate_item(existing_view_idx, true, true, window, cx);                    } else {                        pane.add_item(Box::new(view.clone()), true, true, None, window, cx)                    }                });                cx.notify();            }        });         workspace.register_action(move |workspace, _: &OpenPreviewToTheSide, window, cx| {            if let Some(editor) = Self::resolve_active_item_as_markdown_editor(workspace, cx) {                let view = Self::create_markdown_view(workspace, editor.clone(), window, cx);                let pane = workspace                    .find_pane_in_direction(workspace::SplitDirection::Right, cx)                    .unwrap_or_else(|| {                        workspace.split_pane(                            workspace.active_pane().clone(),                            workspace::SplitDirection::Right,                            window,                            cx,                        )                    });                pane.update(cx, |pane, cx| {                    if let Some(existing_view_idx) = Self::find_existing_preview_item_idx(pane) {                        pane.activate_item(existing_view_idx, true, true, window, cx);                    } else {                        pane.add_item(Box::new(view.clone()), false, false, None, window, cx)                    }                });                editor.focus_handle(cx).focus(window);                cx.notify();            }        });    }     fn find_existing_preview_item_idx(pane: &Pane) -> Option<usize> {        pane.items_of_type::<MarkdownPreviewView>()            .nth(0)            .and_then(|view| pane.index_for_item(&view))    }     pub fn resolve_active_item_as_markdown_editor(        workspace: &Workspace,        cx: &mut Context<Workspace>,    ) -> Option<Entity<Editor>> {        if let Some(editor) = workspace            .active_item(cx)            .and_then(|item| item.act_as::<Editor>(cx))        {            if Self::is_markdown_file(&editor, cx) {                return Some(editor);            }        }        None    }     fn create_markdown_view(        workspace: &mut Workspace,        editor: Entity<Editor>,        window: &mut Window,        cx: &mut Context<Workspace>,    ) -> Entity<MarkdownPreviewView> {        let language_registry = workspace.project().read(cx).languages().clone();        let workspace_handle = workspace.weak_handle();        MarkdownPreviewView::new(            MarkdownPreviewMode::Follow,            editor,            workspace_handle,            language_registry,            None,            window,            cx,        )    }     pub fn new(        mode: MarkdownPreviewMode,        active_editor: Entity<Editor>,        workspace: WeakEntity<Workspace>,        language_registry: Arc<LanguageRegistry>,        fallback_description: Option<SharedString>,        window: &mut Window,        cx: &mut Context<Workspace>,    ) -> Entity<Self> {        cx.new(|cx| {            let view = cx.entity().downgrade();             let list_state = ListState::new(                0,                gpui::ListAlignment::Top,                px(1000.),                move |ix, window, cx| {                    if let Some(view) = view.upgrade() {                        view.update(cx, |this: &mut Self, cx| {                            let Some(contents) = &this.contents else {                                return div().into_any();                            };                             let mut render_cx =                                RenderContext::new(Some(this.workspace.clone()), window, cx)                                    .with_checkbox_clicked_callback({                                        let view = view.clone();                                        move |checked, source_range, window, cx| {                                            view.update(cx, |view, cx| {                                                if let Some(editor) = view                                                    .active_editor                                                    .as_ref()                                                    .map(|s| s.editor.clone())                                                {                                                    editor.update(cx, |editor, cx| {                                                        let task_marker =                                                            if checked { "[x]" } else { "[ ]" };                                                         editor.edit(                                                            vec![(source_range, task_marker)],                                                            cx,                                                        );                                                    });                                                    view.parse_markdown_from_active_editor(                                                        false, window, cx,                                                    );                                                    cx.notify();                                                }                                            })                                        }                                    });                            let block = contents.children.get(ix).unwrap();                            let rendered_block = render_markdown_block(block, &mut render_cx);                             let should_apply_padding = Self::should_apply_padding_between(                                block,                                contents.children.get(ix + 1),                            );                             div()                                .id(ix)                                .when(should_apply_padding, |this| this.pb_3())                                .group("markdown-block")                                .on_click(cx.listener(                                    move |this, event: &ClickEvent, window, cx| {                                        if event.down.click_count == 2 {                                            if let Some(source_range) = this                                                .contents                                                .as_ref()                                                .and_then(|c| c.children.get(ix))                                                .and_then(|block| block.source_range())                                            {                                                this.move_cursor_to_block(                                                    window,                                                    cx,                                                    source_range.start..source_range.start,                                                );                                            }                                        }                                    },                                ))                                .map(move |container| {                                    let indicator = div()                                        .h_full()                                        .w(px(4.0))                                        .when(ix == this.selected_block, |this| {                                            this.bg(cx.theme().colors().border)                                        })                                        .group_hover("markdown-block", |s| {                                            if ix == this.selected_block {                                                s                                            } else {                                                s.bg(cx.theme().colors().border_variant)                                            }                                        })                                        .rounded_sm();                                     container.child(                                        div()                                            .relative()                                            .child(div().pl_4().child(rendered_block))                                            .child(indicator.absolute().left_0().top_0()),                                    )                                })                                .into_any()                        })                    } else {                        div().into_any()                    }                },            );             let mut this = Self {                selected_block: 0,                active_editor: None,                focus_handle: cx.focus_handle(),                workspace: workspace.clone(),                contents: None,                list_state,                tab_description: None,                language_registry,                fallback_tab_description: fallback_description                    .unwrap_or_else(|| "Markdown Preview".into()),                parsing_markdown_task: None,            };             this.set_editor(active_editor, window, cx);             if mode == MarkdownPreviewMode::Follow {                if let Some(workspace) = &workspace.upgrade() {                    cx.observe_in(workspace, window, |this, workspace, window, cx| {                        let item = workspace.read(cx).active_item(cx);                        this.workspace_updated(item, window, cx);                    })                    .detach();                } else {                    log::error!("Failed to listen to workspace updates");                }            }             this        })    }     fn workspace_updated(        &mut self,        active_item: Option<Box<dyn ItemHandle>>,        window: &mut Window,        cx: &mut Context<Self>,    ) {        if let Some(item) = active_item {            if item.item_id() != cx.entity_id() {                if let Some(editor) = item.act_as::<Editor>(cx) {                    if Self::is_markdown_file(&editor, cx) {                        self.set_editor(editor, window, cx);                    }                }            }        }    }     pub fn is_markdown_file<V>(editor: &Entity<Editor>, cx: &mut Context<V>) -> bool {        let buffer = editor.read(cx).buffer().read(cx);        if let Some(buffer) = buffer.as_singleton() {            if let Some(language) = buffer.read(cx).language() {                return language.name() == "Markdown".into();            }        }        false    }     fn set_editor(&mut self, editor: Entity<Editor>, window: &mut Window, cx: &mut Context<Self>) {        if let Some(active) = &self.active_editor {            if active.editor == editor {                return;            }        }         let subscription = cx.subscribe_in(            &editor,            window,            |this, editor, event: &EditorEvent, window, cx| {                match event {                    EditorEvent::Edited { .. }                    | EditorEvent::DirtyChanged                    | EditorEvent::ExcerptsEdited { .. } => {                        this.parse_markdown_from_active_editor(true, window, cx);                    }                    EditorEvent::SelectionsChanged { .. } => {                        let selection_range = editor                            .update(cx, |editor, cx| editor.selections.last::<usize>(cx).range());                        this.selected_block = this.get_block_index_under_cursor(selection_range);                        this.list_state.scroll_to_reveal_item(this.selected_block);                        cx.notify();                    }                    _ => {}                };            },        );         self.tab_description = editor            .read(cx)            .tab_description(0, cx)            .map(|tab_description| format!("Preview {}", tab_description));         self.active_editor = Some(EditorState {            editor,            _subscription: subscription,        });         self.parse_markdown_from_active_editor(false, window, cx);    }     fn parse_markdown_from_active_editor(        &mut self,        wait_for_debounce: bool,        window: &mut Window,        cx: &mut Context<Self>,    ) {        if let Some(state) = &self.active_editor {            self.parsing_markdown_task = Some(self.parse_markdown_in_background(                wait_for_debounce,                state.editor.clone(),                window,                cx,            ));        }    }     fn parse_markdown_in_background(        &mut self,        wait_for_debounce: bool,        editor: Entity<Editor>,        window: &mut Window,        cx: &mut Context<Self>,    ) -> Task<Result<()>> {        let language_registry = self.language_registry.clone();         cx.spawn_in(window, move |view, mut cx| async move {            if wait_for_debounce {                // Wait for the user to stop typing                cx.background_executor().timer(REPARSE_DEBOUNCE).await;            }             let (contents, file_location) = view.update(&mut cx, |_, cx| {                let editor = editor.read(cx);                let contents = editor.buffer().read(cx).snapshot(cx).text();                let file_location = MarkdownPreviewView::get_folder_for_active_editor(editor, cx);                (contents, file_location)            })?;             let parsing_task = cx.background_spawn(async move {                parse_markdown(&contents, file_location, Some(language_registry)).await            });            let contents = parsing_task.await;            view.update(&mut cx, move |view, cx| {                let markdown_blocks_count = contents.children.len();                view.contents = Some(contents);                let scroll_top = view.list_state.logical_scroll_top();                view.list_state.reset(markdown_blocks_count);                view.list_state.scroll_to(scroll_top);                cx.notify();            })        })    }     fn move_cursor_to_block(        &self,        window: &mut Window,        cx: &mut Context<Self>,        selection: Range<usize>,    ) {        if let Some(state) = &self.active_editor {            state.editor.update(cx, |editor, cx| {                editor.change_selections(                    Some(Autoscroll::Strategy(AutoscrollStrategy::Center)),                    window,                    cx,                    |selections| selections.select_ranges(vec![selection]),                );                window.focus(&editor.focus_handle(cx));            });        }    }     /// The absolute path of the file that is currently being previewed.    fn get_folder_for_active_editor(editor: &Editor, cx: &App) -> Option<PathBuf> {        if let Some(file) = editor.file_at(0, cx) {            if let Some(file) = file.as_local() {                file.abs_path(cx).parent().map(|p| p.to_path_buf())            } else {                None            }        } else {            None        }    }     fn get_block_index_under_cursor(&self, selection_range: Range<usize>) -> usize {        let mut block_index = None;        let cursor = selection_range.start;         let mut last_end = 0;        if let Some(content) = &self.contents {            for (i, block) in content.children.iter().enumerate() {                let Some(Range { start, end }) = block.source_range() else {                    continue;                };                 // Check if the cursor is between the last block and the current block                if last_end <= cursor && cursor < start {                    block_index = Some(i.saturating_sub(1));                    break;                }                 if start <= cursor && end >= cursor {                    block_index = Some(i);                    break;                }                last_end = end;            }             if block_index.is_none() && last_end < cursor {                block_index = Some(content.children.len().saturating_sub(1));            }        }         block_index.unwrap_or_default()    }     fn should_apply_padding_between(        current_block: &ParsedMarkdownElement,        next_block: Option<&ParsedMarkdownElement>,    ) -> bool {        !(current_block.is_list_item() && next_block.map(|b| b.is_list_item()).unwrap_or(false))    }} impl Focusable for MarkdownPreviewView {    fn focus_handle(&self, _: &App) -> gpui::FocusHandle {        self.focus_handle.clone()    }} #[derive(Clone, Debug, PartialEq, Eq)]pub enum PreviewEvent {} impl EventEmitter<PreviewEvent> for MarkdownPreviewView {} impl Item for MarkdownPreviewView {    type Event = PreviewEvent;     fn tab_icon(&self, _window: &Window, _cx: &App) -> Option<Icon> {        Some(Icon::new(IconName::FileDoc))    }     fn tab_content_text(&self, _window: &Window, _cx: &App) -> Option<SharedString> {        Some(if let Some(description) = &self.tab_description {            description.clone().into()        } else {            self.fallback_tab_description.clone()        })    } 

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