fix math detection

src/misc/markdown.rs

@@ -62,6 +62,7 @@ pub fn get_options() -> ComrakOptions {
     }
 }
 
+/// Transform markdown string to File structure
 pub fn read(raw_text: &str) -> File {
     let arena = Arena::new();
 
@@ -76,15 +77,16 @@ pub fn read(raw_text: &str) -> File {
     format_html(root, &options, &mut html).unwrap();
 
     let mermaid_name = "mermaid";
+    let html_content = String::from_utf8(html).unwrap();
 
     File {
         metadata: Metadata {
             info: metadata,
             mermaid: check_mermaid(root, mermaid_name.to_owned()),
             syntax_highlight: check_code(root, &[mermaid_name.to_owned()]),
-            math: check_math(root),
+            math: check_math(&html_content),
         },
-        content: String::from_utf8(html).unwrap(),
+        content: html_content,
     }
 }
 
@@ -112,7 +114,7 @@ pub fn get_metadata<'a>(root: &'a AstNode<'a>) -> FileMetadata {
     }
 }
 
-/// Recursively check whether mermaid diagrams are in the AST
+/// Check whether mermaid diagrams are in the AST
 fn check_mermaid<'a>(root: &'a AstNode<'a>, mermaid_str: String) -> bool {
     root.children().any(|node| match &node.data.borrow().value {
         // Check if code of block define a mermaid diagram
@@ -121,7 +123,7 @@ fn check_mermaid<'a>(root: &'a AstNode<'a>, mermaid_str: String) -> bool {
     })
 }
 
-/// Recursively check if code is in the AST
+/// Check if code is in the AST
 fn check_code<'a>(root: &'a AstNode<'a>, blacklist: &[String]) -> bool {
     root.children().any(|node| match &node.data.borrow().value {
         // Detect code in paragraph
@@ -135,7 +137,7 @@ fn check_code<'a>(root: &'a AstNode<'a>, blacklist: &[String]) -> bool {
     })
 }
 
-/// Check recursively if maths is in the AST
-fn check_math<'a>(root: &'a AstNode<'a>) -> bool {
-    root.children().any(|_node| false)
+/// Check if html can contains maths
+fn check_math(html: &str) -> bool {
+    html.contains('$')
 }