v1.2.9: mermaid diagrams, math editor, external viewer, manual notebook sort, heading hotkeys

src-tauri/src/ai.rs

@@ -190,7 +190,6 @@ async fn stream_anthropic(
         }
     }
 
-    // Stream ended — send done
     let _ = app.emit(
         "ai-stream",
         AiStreamEvent {

src-tauri/src/backup.rs

@@ -207,7 +207,7 @@ pub fn restore_backup(vault_path: &str, backup_path: &str) -> Result<(), String>
             .to_string_lossy()
             .to_string();
 
-        // Keep hidden dirs (.helixnotes) — we'll handle attachments separately
+        // Keep hidden dirs (.helixnotes) - we'll handle attachments separately
         if name.starts_with('.') {
             continue;
         }

src-tauri/src/commands.rs

@@ -11,7 +11,7 @@ use tauri::{AppHandle, Manager, State};
 pub fn open_vault(app: AppHandle, state: State<'_, AppState>, path: String) -> Result<(), String> {
     operations::ensure_vault_structure(&path)?;
 
-    // Initialize search index — rebuild in background on Android (FUSE is slow)
+    // Initialize search index - rebuild in background on Android (FUSE is slow)
     let search = std::sync::Arc::new(SearchIndex::new(&path)?);
     #[cfg(target_os = "android")]
     {
@@ -430,7 +430,7 @@ pub fn get_graph_data(state: State<'_, AppState>) -> Result<crate::types::GraphD
     let vault_path = config.active_vault.as_ref().ok_or("No active vault")?;
     let vault = std::path::Path::new(vault_path);
 
-    // Pass 1: collect ALL notes as nodes (no title deduplication — every note must appear)
+    // Pass 1: collect ALL notes as nodes (no title deduplication - every note must appear)
     let mut graph_nodes = Vec::new();
     // title → list of node indices (one title can map to multiple notes in different folders)
     let mut title_to_idxs: HashMap<String, Vec<usize>> = HashMap::new();
@@ -495,7 +495,7 @@ pub fn get_graph_data(state: State<'_, AppState>) -> Result<crate::types::GraphD
         if src == tgt { return; }
         if edge_map.contains_key(&(src, tgt)) { return; } // exact duplicate
         if let Some(&rev_idx) = edge_map.get(&(tgt, src)) {
-            // Reverse direction already exists — mark it as bidirectional
+            // Reverse direction already exists - mark it as bidirectional
             edges[rev_idx].bidirectional = true;
         } else {
             let idx = edges.len();
@@ -527,7 +527,7 @@ pub fn get_graph_data(state: State<'_, AppState>) -> Result<crate::types::GraphD
                     if let Some(&target_idx) = relpath_to_idx.get(&link) {
                         add_edge(&mut edges, &mut edge_map, source_idx, target_idx);
                     } else if let Some(targets) = title_to_idxs.get(&link) {
-                        // 2. Title match — connect to all notes with this title
+                        // 2. Title match - connect to all notes with this title
                         for &target_idx in targets {
                             add_edge(&mut edges, &mut edge_map, source_idx, target_idx);
                         }
@@ -728,6 +728,32 @@ pub fn copy_image_to_clipboard(_path: String) -> Result<(), String> {
     Err("Clipboard image copy not supported on Android".to_string())
 }
 
+/// Copy PNG bytes directly to the system clipboard.
+#[cfg(not(target_os = "android"))]
+#[tauri::command]
+pub fn copy_png_to_clipboard(data: Vec<u8>) -> Result<(), String> {
+    let img = image::load_from_memory(&data)
+        .map_err(|e| format!("Failed to decode image: {}", e))?;
+    let rgba = img.to_rgba8();
+    let (w, h) = rgba.dimensions();
+    let img_data = arboard::ImageData {
+        width: w as usize,
+        height: h as usize,
+        bytes: std::borrow::Cow::Owned(rgba.into_raw()),
+    };
+    let mut clipboard = arboard::Clipboard::new()
+        .map_err(|e| format!("Clipboard init failed: {}", e))?;
+    clipboard.set_image(img_data)
+        .map_err(|e| format!("Failed to set clipboard image: {}", e))?;
+    Ok(())
+}
+
+#[cfg(target_os = "android")]
+#[tauri::command]
+pub fn copy_png_to_clipboard(_data: Vec<u8>) -> Result<(), String> {
+    Err("Clipboard image copy not supported on Android".to_string())
+}
+
 // ── Attachments ──
 
 #[tauri::command]
@@ -1459,6 +1485,13 @@ pub fn copy_file_to(source: String, destination: String) -> Result<(), String> {
     Ok(())
 }
 
+#[tauri::command]
+pub fn write_bytes_to(destination: String, data: Vec<u8>) -> Result<(), String> {
+    std::fs::write(&destination, &data).map_err(|e| format!("Failed to write file: {}", e))?;
+    Ok(())
+}
+
+
 // ── Backup ──
 
 #[tauri::command]
@@ -1717,10 +1750,10 @@ pub fn ai_ask(
 
     let mut system_prompt = "You are a helpful writing assistant inside a note-taking app called HelixNotes. \
         You help users improve, rewrite, summarize, and transform their text. \
-        Return ONLY the resulting text — no explanations, no markdown code fences, no preamble. \
+        Return ONLY the resulting text - no explanations, no markdown code fences, no preamble. \
         Preserve the original language of the text unless specifically asked to translate. \
         Preserve any markdown formatting (bold, italic, links, images, tables, etc.) unless the user asks to change it. \
-        If the text contains placeholders like __MEDIA_0__, __MEDIA_1__, etc., keep them exactly as they are in their original positions — they represent images and embedded files.".to_string();
+        If the text contains placeholders like __MEDIA_0__, __MEDIA_1__, etc., keep them exactly as they are in their original positions - they represent images and embedded files.".to_string();
 
     if let Some(ref style) = writing_style {
         system_prompt.push_str(&format!(

src-tauri/src/history.rs

@@ -157,7 +157,7 @@ fn prune_versions(dir: &Path, max: u32) -> Result<(), String> {
         .filter(|p| p.extension().map_or(false, |ext| ext == "md"))
         .collect();
 
-    // Sort by name (timestamps sort lexicographically) — newest last
+    // Sort by name (timestamps sort lexicographically) - newest last
     files.sort();
 
     if files.len() as u32 > max {

src-tauri/src/lib.rs

@@ -139,6 +139,8 @@ pub fn run() {
             commands::open_file,
             commands::open_url,
             commands::copy_file_to,
+            commands::write_bytes_to,
+            commands::copy_png_to_clipboard,
             commands::create_backup,
             commands::list_backups,
             commands::restore_backup,

src-tauri/src/types.rs

@@ -199,6 +199,10 @@ pub struct VaultState {
     pub sidebar_collapsed: bool,
     #[serde(default)]
     pub collapsed_notebooks: Vec<String>,
+    #[serde(default)]
+    pub notebook_sort_mode: String,
+    #[serde(default)]
+    pub notebook_order: std::collections::HashMap<String, i32>,
 }
 
 impl Default for VaultState {
@@ -209,6 +213,8 @@ impl Default for VaultState {
             notelist_width: 280.0,
             sidebar_collapsed: false,
             collapsed_notebooks: Vec::new(),
+            notebook_sort_mode: String::new(),
+            notebook_order: std::collections::HashMap::new(),
         }
     }
 }

src-tauri/src/vault/frontmatter.rs

@@ -61,7 +61,7 @@ pub fn parse_note(raw: &str, filename: &str) -> (NoteMeta, String) {
         .and_then(|s| parse_date_flexible(&s))
         .unwrap_or_else(Utc::now);
 
-    // Don't generate UUID on read — empty string signals "no ID yet"
+    // Don't generate UUID on read - empty string signals "no ID yet"
     let id = fm.id.unwrap_or_default();
 
     let meta = NoteMeta {
@@ -309,7 +309,7 @@ fn strip_html_and_markdown(input: &str) -> String {
             continue;
         }
 
-        // Markdown links: [text](url) — keep the text, skip the URL
+        // Markdown links: [text](url) - keep the text, skip the URL
         if ch == '[' {
             let mut link_text = String::new();
             let mut depth = 1;

src-tauri/src/vault/operations.rs

@@ -281,7 +281,7 @@ fn read_note_entry(path: &Path, vault_root: &Path) -> Result<NoteEntry, String>
 /// uses filesystem timestamps for dates. No preview text.
 #[cfg(target_os = "android")]
 fn read_note_entry_metadata_only(path: &Path, vault_root: &Path) -> Result<NoteEntry, String> {
-    // Read first 2KB — enough for frontmatter with tags, title, pinned
+    // Read first 2KB - enough for frontmatter with tags, title, pinned
     let mut file = fs::File::open(path).map_err(|e| e.to_string())?;
     let mut buf = vec![0u8; 2048];
     let bytes_read = file.read(&mut buf).map_err(|e| e.to_string())?;
@@ -917,7 +917,6 @@ pub fn get_trash_contents(vault_path: &str) -> Result<TrashContents, String> {
                 notes.push(note);
             }
         } else if path.is_dir() {
-            // Deleted notebook — count .md files inside
             let note_count = WalkDir::new(&path)
                 .min_depth(1)
                 .into_iter()