Add anchors to markdown headings (fixes #77)

Cargo.lock

@@ -1425,6 +1425,16 @@ version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fb8d784f27acf97159b40fc4db5ecd8aa23b9ad5ef69cdd136d3bc80665f0c0"
 
+[[package]]
+name = "github-slugger"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "721820f4eab1c427d482e144b63288754d9872fb7f0d72d73ab101008ef43147"
+dependencies = [
+ "once_cell",
+ "regex",
+]
+
 [[package]]
 name = "gloo-net"
 version = "0.6.0"
@@ -1736,6 +1746,7 @@ dependencies = [
  "log",
  "markdown-it",
  "markdown-it-block-spoiler",
+ "markdown-it-heading-anchors",
  "once_cell",
  "pretty_assertions",
  "rand",
@@ -2304,6 +2315,16 @@ dependencies = [
  "markdown-it",
 ]
 
+[[package]]
+name = "markdown-it-heading-anchors"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c8c71a46fc41bf2fdac133c188c1477562b7bcd1be3981e84fc81cfc2e515fe"
+dependencies = [
+ "github-slugger",
+ "markdown-it",
+]
+
 [[package]]
 name = "matchit"
 version = "0.7.3"

Cargo.toml

@@ -82,6 +82,7 @@ tower-layer = "0.3.3"
 katex = { version = "0.4", default-features = false }
 include_dir = "0.7.4"
 markdown-it-block-spoiler = "1.0.0"
+markdown-it-heading-anchors = "0.3.0"
 
 [dev-dependencies]
 pretty_assertions = "1.4.1"

src/frontend/markdown.rs

@@ -29,6 +29,7 @@ pub fn render_markdown(text: &str) -> String {
 fn markdown_parser() -> MarkdownIt {
     let mut parser = MarkdownIt::new();
     markdown_it::plugins::cmark::add(&mut parser);
+    markdown_it_heading_anchors::add(&mut parser);
     markdown_it::plugins::extra::strikethrough::add(&mut parser);
     markdown_it::plugins::extra::tables::add(&mut parser);
     markdown_it::plugins::extra::typographer::add(&mut parser);