From 15d78464ba9a717a71e1dc47a4101c8b13ec6581 Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Mon, 26 Sep 2022 14:14:58 +0200
Subject: syntax highlighting with syntect

---
 code/src/syntax_highlight/mod.rs | 44 +++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 21 deletions(-)

(limited to 'code/src/syntax_highlight/mod.rs')

diff --git a/code/src/syntax_highlight/mod.rs b/code/src/syntax_highlight/mod.rs
index 62a2536..86b689a 100644
--- a/code/src/syntax_highlight/mod.rs
+++ b/code/src/syntax_highlight/mod.rs
@@ -1,27 +1,29 @@
-pub mod grammar;
-pub mod theme;
 
-use crate::{markdown::render::escape, syntax_highlight::theme::theme};
-use grammar::grammar_for;
-use synoptic::{Highlighter, Token};
+use crate::markdown::render::escape;
+use lazy_static::lazy_static;
+use syntect::easy::HighlightLines;
+use syntect::highlighting::{Style, ThemeSet};
+use syntect::parsing::SyntaxSet;
+use syntect::util::{as_24_bit_terminal_escaped, LinesWithEndings};
 
-pub fn syntax_highlight(lang: &str, source: &str) -> String {
-    let mut h = Highlighter::new();
-    for (kind, regex) in grammar_for(lang) {
-        h.join(regex, kind).unwrap();
-    }
-    let highlighting = h.run(source);
-    let mut out = String::new();
+lazy_static! {
+    static ref PS: SyntaxSet = SyntaxSet::load_defaults_newlines();
+    static ref TS: ThemeSet = ThemeSet::load_defaults();
+}
+
+pub fn syntax_highlight(lang: &str, source: &str) -> Option<String> {
+    let syntax = PS.find_syntax_by_extension(lang)?;
+    let mut h = HighlightLines::new(syntax, &TS.themes["Solarized (dark)"]);
 
-    for (_c, row) in highlighting.iter().enumerate() {
-        for tok in row {
-            match tok {
-                Token::Start(kind) => out += &format!("<span style=\"color:{}\">", theme(kind)),
-                Token::Text(text) => out += &escape(text),
-                Token::End(_kind) => out += "</span>",
-            }
+    let mut o = String::new();
+    for line in LinesWithEndings::from(source) {
+        let ranges: Vec<(Style, &str)> = h.highlight_line(line, &PS).unwrap();
+        for (style, span) in ranges {
+            o += &format!(
+                "<span style=\"color: #{:02x}{:02x}{:02x}\">{}</span>",
+                style.foreground.r, style.foreground.g, style.foreground.b, span
+            );
         }
-        out += "\n"
     }
-    out
+    return Some(o);
 }
-- 
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