only load syntaxes and themes once

src/models/pretty.rs

@@ -1,7 +1,9 @@
 use std::fs;
+use std::io::Cursor;
 use std::path::Path;
+use std::sync::LazyLock;
 
-use syntect::highlighting::ThemeSet;
+use syntect::highlighting::{Theme, ThemeSet};
 use syntect::html::highlighted_html_for_string;
 use syntect::parsing::SyntaxSet;
 
@@ -10,17 +12,22 @@ static SYNTAXES: &[u8] =
 static THEMES: &[u8] =
     include_bytes!("../../resources/themes/ayu_dark.tmTheme");
 
+static SS: LazyLock<SyntaxSet> = LazyLock::new(|| {
+    syntect::dumps::from_uncompressed_data(SYNTAXES)
+        .expect("invalid syntax dump")
+});
+
+static THEME: LazyLock<Theme> = LazyLock::new(|| {
+    ThemeSet::load_from_reader(&mut Cursor::new(THEMES))
+        .expect("invalid theme")
+});
+
 pub fn get_pretty_body(path: &Path, ext: &str) -> std::io::Result<String> {
-    let ss: SyntaxSet = syntect::dumps::from_binary(SYNTAXES);
-
-    let mut theme_cursor = std::io::Cursor::new(THEMES);
-    let theme = ThemeSet::load_from_reader(&mut theme_cursor).unwrap();
-
     let content = fs::read_to_string(path)?;
-    let syntax = ss
+    let syntax = SS
         .find_syntax_by_token(ext)
-        .unwrap_or_else(|| ss.find_syntax_plain_text());
+        .unwrap_or_else(|| SS.find_syntax_plain_text());
 
-    highlighted_html_for_string(&content, &ss, syntax, &theme)
+    highlighted_html_for_string(&content, &SS, syntax, &THEME)
         .map_err(std::io::Error::other)
 }