feat: ignore frontmatter

Cargo.toml

@@ -14,6 +14,7 @@ categories = ["development-tools"]
 [dependencies]
 clap = { version = "4.5.2", features = ["derive"] }
 ignore = "0.4.22"
+matter = "0.1.0-alpha4"
 pulldown-cmark = { version = "0.9.6", default-features = false }
 pulldown-cmark-to-cmark = "11.2.0"
 schemars = "0.8.16"

src/lib.rs

@@ -2,6 +2,7 @@ use config::MdsfConfig;
 use error::MdsfError;
 use formatters::format_snippet;
 use languages::Language;
+use matter::matter;
 use pulldown_cmark::CowStr;
 use pulldown_cmark_to_cmark::cmark_resume_with_options;
 
@@ -48,7 +49,11 @@ pub fn format_file(config: &MdsfConfig, path: &std::path::Path) -> Result<(), Md
         return Ok(());
     }
 
-    let parser = pulldown_cmark::Parser::new_ext(&input, pulldown_cmark::Options::all());
+    // NOTE: should be removed once `pulldown-cmark-to-cmark` is upgraded to `v0.10.0` of `pulldown-cmark`
+    let (frontmatter, markdown_input) =
+        matter(&input).unwrap_or_else(|| (String::new(), input.to_owned()));
+
+    let parser = pulldown_cmark::Parser::new_ext(&markdown_input, pulldown_cmark::Options::all());
 
     let mut output = String::with_capacity(input.len() + 128);
 
@@ -105,6 +110,12 @@ pub fn format_file(config: &MdsfConfig, path: &std::path::Path) -> Result<(), Md
         s.finalize(&mut output).map_err(MdsfError::from)?;
     }
 
+    output = output.trim().to_owned();
+
+    if !frontmatter.is_empty() {
+        output = format!("---\n{frontmatter}\n---\n\n{output}");
+    }
+
     if config.markdown.enabled {
         if !output.is_empty() {
             output = format_snippet(config, &Language::Markdown, &output);

tests/frontmatter.md

@@ -0,0 +1,19 @@
+---
+tile1: asd asd
+tile2: asd asd
+tile3: asd asd
+
+tile4: asd asd
+
+tile5: asd asd
+---
+
+this is the content
+
+```go
+package main
+
+func add(a int, b int) int {
+	return a + b
+}
+```