Feat: collapsible help

src/views/help_view.rs

@@ -11,7 +11,7 @@ use crate::model::docs::{get_topic, DocEntry, DOCS};
 use crate::state::HelpFocus;
 use crate::theme;
 use crate::views::highlight;
-use crate::widgets::{render_search_bar, CategoryItem, CategoryList};
+use crate::widgets::{render_search_bar, CategoryItem, CategoryList, Selection};
 
 use DocEntry::{Section, Topic};
 
@@ -105,21 +105,38 @@ fn render_topics(frame: &mut Frame, app: &App, area: Rect) {
     let theme = theme::get();
     let focused = app.ui.help_focus == HelpFocus::Topics;
 
+    let mut section_idx = 0usize;
     let items: Vec<CategoryItem> = DOCS
         .iter()
         .map(|entry| match entry {
-            Section(name) => CategoryItem {
-                label: name,
-                is_section: true,
-            },
+            Section(name) => {
+                let collapsed = app
+                    .ui
+                    .help_collapsed
+                    .get(section_idx)
+                    .copied()
+                    .unwrap_or(false);
+                section_idx += 1;
+                CategoryItem {
+                    label: name,
+                    is_section: true,
+                    collapsed,
+                }
+            }
             Topic(name, _) => CategoryItem {
                 label: name,
                 is_section: false,
+                collapsed: false,
             },
         })
         .collect();
 
-    CategoryList::new(&items, app.ui.help_topic)
+    let selection = match app.ui.help_on_section {
+        Some(s) => Selection::Section(s),
+        None => Selection::Item(app.ui.help_topic),
+    };
+
+    CategoryList::new(&items, selection)
         .focused(focused)
         .title("Topics")
         .selected_color(theme.dict.category_selected)
@@ -172,7 +189,8 @@ fn render_content(frame: &mut Frame, app: &App, area: Rect) {
     {
         let mut cache = app.ui.help_parsed.borrow_mut();
         if cache[app.ui.help_topic].is_none() {
-            cache[app.ui.help_topic] = Some(cagire_markdown::parse(md, &AppTheme, &ForthHighlighter));
+            cache[app.ui.help_topic] =
+                Some(cagire_markdown::parse(md, &AppTheme, &ForthHighlighter));
         }
     }
     let cache = app.ui.help_parsed.borrow();
@@ -182,7 +200,12 @@ fn render_content(frame: &mut Frame, app: &App, area: Rect) {
     let content_area = if has_search_bar {
         let [content, search] =
             Layout::vertical([Constraint::Fill(1), Constraint::Length(1)]).areas(md_area);
-        render_search_bar(frame, search, &app.ui.help_search_query, app.ui.help_search_active);
+        render_search_bar(
+            frame,
+            search,
+            &app.ui.help_search_query,
+            app.ui.help_search_active,
+        );
         content
     } else {
         md_area
@@ -295,4 +318,3 @@ fn highlight_line<'a>(line: RLine<'a>, query: &str) -> RLine<'a> {
 fn find_bytes(haystack: &[u8], needle: &[u8]) -> Option<usize> {
     haystack.windows(needle.len()).position(|w| w == needle)
 }
-