v1.1.6 - Multi-window, single-instance file handling, line height setting

src-tauri/src/vault/frontmatter.rs

@@ -77,6 +77,29 @@ pub fn parse_note(raw: &str, filename: &str) -> (NoteMeta, String) {
     (meta, content)
 }
 
+/// Ensure the body starts with `# Title` heading for external app compatibility.
+/// If the body already starts with `# Title`, leave it as-is.
+fn ensure_title_heading(body: &str, title: &str) -> String {
+    let trimmed = body.trim_start();
+
+    // Check if body already starts with `# Title`
+    if let Some(rest) = trimmed.strip_prefix("# ") {
+        let first_line_end = rest.find('\n').unwrap_or(rest.len());
+        let heading_text = rest[..first_line_end].trim();
+        if heading_text.eq_ignore_ascii_case(title.trim()) {
+            return body.to_string();
+        }
+    }
+
+    // Don't add heading to empty notes (new/blank notes)
+    if trimmed.is_empty() {
+        return body.to_string();
+    }
+
+    // Prepend `# Title` heading
+    format!("# {}\n\n{}", title, body)
+}
+
 pub fn serialize_frontmatter(meta: &NoteMeta) -> String {
     let tags_str = if meta.tags.is_empty() {
         "[]".to_string()
@@ -104,7 +127,8 @@ pub fn serialize_frontmatter(meta: &NoteMeta) -> String {
 
 pub fn update_note_raw(meta: &NoteMeta, body: &str) -> String {
     let fm = serialize_frontmatter(meta);
-    format!("{}{}", fm, body)
+    let body_with_heading = ensure_title_heading(body, &meta.title);
+    format!("{}{}", fm, body_with_heading)
 }
 
 /// Merge NoteMeta fields into existing frontmatter, preserving unknown YAML keys.
@@ -163,7 +187,8 @@ pub fn merge_frontmatter(original_raw: &str, meta: &NoteMeta, body: &str) -> Str
         Err(_) => return update_note_raw(meta, body),
     };
 
-    format!("---\n{}---\n{}", yaml_str, body)
+    let body_with_heading = ensure_title_heading(body, &meta.title);
+    format!("---\n{}---\n{}", yaml_str, body_with_heading)
 }
 
 fn filename_to_title(filename: &str) -> String {