Respect toc attribute in metadata

src/misc/markdown.rs

@@ -1,8 +1,10 @@
 use crate::misc::date::Date;
 use base64::engine::general_purpose;
 use base64::Engine;
-use comrak::nodes::{AstNode, NodeValue};
-use comrak::{format_html, parse_document, Arena, ComrakOptions, ListStyleType, Options};
+use comrak::nodes::{AstNode, NodeCode, NodeMath, NodeValue};
+use comrak::{
+    format_html, parse_document, Anchorizer, Arena, ComrakOptions, ListStyleType, Options,
+};
 use lol_html::html_content::ContentType;
 use lol_html::{element, rewrite_str, HtmlRewriter, RewriteStrSettings, Settings};
 use ramhorns::Content;
@@ -119,6 +121,7 @@ impl Metadata {
 pub struct File {
     pub metadata: Metadata,
     pub content: String,
+    pub toc_data: String,
 }
 
 /// Options used for parser and compiler MD --> HTML
@@ -290,6 +293,8 @@ pub fn read_md(
     html_content = custom_img_size(&html_content);
     (html_content, mail_obfsucated) = mail_obfuscation(&html_content);
 
+    let toc = toc_to_html(&generate_toc(root));
+
     let mut final_metadata = Metadata {
         info: metadata,
         mermaid: check_mermaid(root, mermaid_name),
@@ -302,6 +307,7 @@ pub fn read_md(
     File {
         metadata: final_metadata,
         content: html_content,
+        toc_data: toc,
     }
 }
 
@@ -488,3 +494,87 @@ fn mail_obfuscation(html: &str) -> (String, bool) {
         (new_html, is_modified)
     }
 }
+
+#[derive(Debug)]
+struct TOCEntry {
+    id: String,
+    title: String,
+    depth: u8,
+}
+
+fn generate_toc<'a>(root: &'a AstNode<'a>) -> Vec<TOCEntry> {
+    /// See <https://github.com/kivikakk/comrak/blob/b67d406d3b101b93539c37a1ca75bff81ff8c149/src/html.rs#L446>
+    fn collect_text<'a>(node: &'a AstNode<'a>, output: &mut String) {
+        match node.data.borrow().value {
+            NodeValue::Text(ref literal)
+            | NodeValue::Code(NodeCode { ref literal, .. })
+            | NodeValue::Math(NodeMath { ref literal, .. }) => {
+                *output = literal.to_string();
+            }
+            _ => {
+                for n in node.children() {
+                    if !output.is_empty() {
+                        break;
+                    }
+
+                    collect_text(n, output);
+                }
+            }
+        }
+    }
+
+    let mut toc = vec![];
+
+    let mut anchorizer = Anchorizer::new();
+
+    // Collect headings first to avoid mutable borrow conflicts
+    let headings: Vec<_> = root
+        .children()
+        .filter_map(|node| {
+            if let NodeValue::Heading(ref nch) = &node.data.borrow().value {
+                Some((*nch, node))
+            } else {
+                None
+            }
+        })
+        .collect();
+
+    // Now process each heading
+    for (nch, node) in headings {
+        let mut title = String::with_capacity(20);
+        collect_text(node, &mut title);
+
+        toc.push(TOCEntry {
+            id: anchorizer.anchorize(title.clone()),
+            title,
+            depth: nch.level,
+        });
+    }
+
+    toc
+}
+
+fn toc_to_html(toc: &[TOCEntry]) -> String {
+    if toc.is_empty() {
+        return String::new();
+    }
+
+    let mut html = Vec::with_capacity(20 + 20 * toc.len());
+
+    html.extend_from_slice(b"<ul>");
+
+    for entry in toc {
+        // TODO: Use depth
+        html.extend_from_slice(
+            format!(
+                "<li><a href=\"{}\">{} (dbg/depth/{})</a></li>",
+                entry.id, entry.title, entry.depth
+            )
+            .as_bytes(),
+        );
+    }
+
+    html.extend_from_slice(b"</ul>");
+
+    String::from_utf8(html).unwrap()
+}

src/misc/utils.rs

@@ -81,5 +81,6 @@ fn read_pdf(data: Vec<u8>) -> File {
                 style="width: 100%; height: 79vh";
             >"#
         ),
+        toc_data: String::new(),
     }
 }

src/routes/blog.rs

@@ -186,7 +186,6 @@ fn get_posts(location: &str) -> Vec<Post> {
 struct BlogPostTemplate {
     navbar: NavBar,
     post: Option<File>,
-    toc: String,
 }
 
 #[get("/blog/p/{id}")]
@@ -199,7 +198,7 @@ pub async fn page(path: web::Path<(String,)>, config: web::Data<Config>) -> impl
 
 fn build_post(file: &str, config: Config) -> String {
     let mut post = None;
-    let (infos, toc) = get_post(
+    let infos = get_post(
         &mut post,
         file,
         &config.fc.name.unwrap_or_default(),
@@ -214,18 +213,12 @@ fn build_post(file: &str, config: Config) -> String {
                 ..NavBar::default()
             },
             post,
-            toc,
         },
         infos,
     )
 }
 
-fn get_post(
-    post: &mut Option<File>,
-    filename: &str,
-    name: &str,
-    data_dir: &str,
-) -> (InfosPage, String) {
+fn get_post(post: &mut Option<File>, filename: &str, name: &str, data_dir: &str) -> InfosPage {
     let blog_dir = format!("{data_dir}/{BLOG_DIR}/{POST_DIR}");
     let ext = ".md";
 
@@ -234,13 +227,8 @@ fn get_post(
         &TypeFileMetadata::Blog,
     );
 
-    let default = (
-        filename,
-        &format!("Blog d'{name}"),
-        Vec::new(),
-        String::new(),
-    );
-    let (title, desc, tags, toc) = match post {
+    let default = (filename, &format!("Blog d'{name}"), Vec::new());
+    let (title, desc, tags) = match post {
         Some(data) => (
             match &data.metadata.info.blog.as_ref().unwrap().title {
                 Some(text) => text,
@@ -254,16 +242,10 @@ fn get_post(
                 Some(tags) => tags.clone(),
                 None => default.2,
             },
-            match &data.metadata.info.blog.as_ref().unwrap().toc {
-                // TODO: Generate TOC
-                Some(true) => String::new(),
-                _ => default.3,
-            },
         ),
         None => default,
     };
 
-    (
     InfosPage {
         title: Some(format!("Post: {title}")),
         desc: Some(desc.clone()),
@@ -273,9 +255,7 @@ fn get_post(
                 .chain(tags.iter().map(|t| t.name.as_str()))
                 .collect::<Vec<_>>(),
         )),
-        },
-        toc,
-    )
+    }
 }
 
 #[routes]

templates/blog/post.html

@@ -28,7 +28,9 @@
     <main>
       {{^post}}
       <p>This post doesn't exist... sorry</p>
-      {{/post}} {{#post}} {{&toc}}
+      {{/post}} {{#post}} {{#metadata}} {{#info}} {{#blog}} {{#toc}}
+      <aside>{{&toc_data}}</aside>
+      {{/toc}} {{/blog}} {{/info}} {{/metadata}}
       <article>{{&content}}</article>
       {{/post}}
     </main>