Add syntax highlighting using syntect

Cargo.lock

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Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "snekdown"
-version = "0.1.2"
+version = "0.2.0"
 authors = ["trivernis <trivernis@protonmail.com>"]
 edition = "2018"
 license-file = "LICENSE"
@@ -24,3 +24,5 @@ structopt = "0.3.14"
 termion = "1.5.5"
 minify = "1.1.1"
 htmlescape = "0.3.1"
+syntect = "4.2.0"
+rayon = "1.3.0"

src/format/assets/style.css

@@ -22,14 +22,12 @@ img {
 code pre {
     font-family: "Fira Code", monospace;
     padding: 0.8em 0.2em;
-    background-color: #DDD;
+    background-color: #EEE !important;
     border-radius: 0.25em;
 }
 
 code {
     font-family: "Fira Code", monospace;
-    padding: 0 0.1em;
-    background-color: #DDD;
     border-radius: 0.1em;
 }
 

src/format/html.rs

@@ -1,6 +1,10 @@
 use crate::elements::*;
-use htmlescape::encode_minimal;
+use htmlescape::{encode_attribute, encode_minimal};
 use minify::html::minify;
+use rayon::prelude::*;
+use syntect::highlighting::ThemeSet;
+use syntect::html::highlighted_html_for_string;
+use syntect::parsing::SyntaxSet;
 
 macro_rules! combine_with_lb {
     ($a:expr, $b:expr) => {
@@ -59,8 +63,9 @@ impl ToHtml for Document {
     fn to_html(&self) -> String {
         let inner = self
             .elements
-            .iter()
+            .par_iter()
-            .fold("".to_string(), |a, b| format!("{}{}", a, b.to_html()));
+            .map(|e| e.to_html())
+            .reduce(|| "".to_string(), |a, b| format!("{}{}", a, b));
         if self.is_root {
             let style = minify(std::include_str!("assets/style.css"));
             format!(
@@ -91,8 +96,9 @@ impl ToHtml for Section {
     fn to_html(&self) -> String {
         let inner = self
             .elements
-            .iter()
+            .par_iter()
-            .fold("".to_string(), |a, b| format!("{}{}", a, b.to_html()));
+            .map(|e| e.to_html())
+            .reduce(|| "".to_string(), |a, b| format!("{}{}", a, b));
         format!("<section>{}{}</section>", self.header.to_html(), inner)
     }
 }
@@ -179,12 +185,31 @@ impl ToHtml for Cell {
 
 impl ToHtml for CodeBlock {
     fn to_html(&self) -> String {
+        if self.language.len() > 0 {
+            let ps = SyntaxSet::load_defaults_nonewlines();
+            let ts = ThemeSet::load_defaults();
+            if let Some(syntax) = ps.find_syntax_by_token(self.language.as_str()) {
+                format!(
+                    "<div><code lang='{}'>{}</code></div>",
+                    encode_attribute(self.language.clone().as_str()),
+                    highlighted_html_for_string(
+                        self.code.as_str(),
+                        &ps,
+                        syntax,
+                        &ts.themes["InspiredGitHub"]
+                    )
+                )
+            } else {
                 format!(
                     "<div><code lang='{}'><pre>{}</pre></code></div>",
-            self.language.clone(),
+                    encode_attribute(self.language.clone().as_str()),
                     self.code.clone()
                 )
             }
+        } else {
+            format!("<div><code><pre>{}</pre></code></div>", self.code.clone())
+        }
+    }
 }
 
 impl ToHtml for Quote {
@@ -229,8 +254,8 @@ impl ToHtml for Image {
                      </a>\
                      <label class='imageDescription'>{1}</label>\
                      </div>",
-                    encode_minimal(self.url.url.clone().as_str()),
+                    encode_attribute(self.url.url.clone().as_str()),
-                    encode_minimal(description.as_str())
+                    encode_attribute(description.as_str())
                 )
                 .as_str(),
             )

src/main.rs

@@ -48,5 +48,5 @@ fn main() {
         _ => println!("Unknown format {}", opt.format),
     }
     println!("Rendering took:   {:?}", start_render.elapsed());
-    println!("Total:            {:?}{}", start.elapsed(), style::Reset)
+    println!("Total:            {:?}{}", start.elapsed(), style::Reset);
 }