switch to features and handle default lang

Cargo.lock

@@ -82,6 +82,21 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
+dependencies = [
+ "bit-vec",
+]
+
+[[package]]
+name = "bit-vec"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -179,6 +194,16 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "fancy-regex"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b95f7c0680e4142284cf8b22c14a476e87d61b004a3a0861872b32ef7ead40a2"
+dependencies = [
+ "bit-set",
+ "regex",
+]
+
 [[package]]
 name = "flate2"
 version = "1.1.0"
@@ -495,6 +520,7 @@ checksum = "874dcfa363995604333cf947ae9f751ca3af4522c60886774c4963943b4746b1"
 dependencies = [
  "bincode",
  "bitflags",
+ "fancy-regex",
  "flate2",
  "fnv",
  "once_cell",

Cargo.toml

@@ -3,6 +3,11 @@ name = "mdsvexrs"
 version = "0.1.0"
 edition = "2021"
 
+[features]
+fancy = ["syntect/default-fancy"]
+onig = ["syntect/default-onig"]
+default = ["onig"]
+
 [dependencies]
 markdown = { version = "1.0.0-alpha.21", features = ["serde"]}
 itertools = "0.13"
@@ -11,4 +16,4 @@ serde_yaml = "0.9.34"
 serde = { version = "1.0.215", features = ["derive"] }
 regex = "1.11.1"
 clap = { version = "4.5.21", features = ["derive"] }
-syntect = "5.0"
+syntect = { version = "5.0", default-features = false }

src/lib.rs

@@ -591,11 +591,18 @@ impl Context {
         let theme = &self.theme_set.themes["InspiredGitHub"];
         let start = Instant::now();
 
-        let syntax = self.syntax_set.find_syntax_by_token(&code.lang);
+        let mut lang = &code.lang;
+        if lang.is_empty() {
+            if let Some(default) = &self.default_lang {
+                lang = default;
+            } else {
+                return format!("<pre><code>{}</code></pre>", html_encode(&code.code));
+            }
+        }
+        let syntax = self.syntax_set.find_syntax_by_token(lang);
         let syntax = match syntax {
             Some(t) => t,
             None => {
-                println!("No syntax found for {}", code.lang);
                 return format!("<pre><code>{}</code></pre>", html_encode(&code.code));
             }
         };