chore: Extract par of the syntax highlighting code

Author: vbfox

crates/engarde/src/syntax.rs

@@ -66,32 +66,38 @@ impl Syntax {
         self.default_theme = Some(theme.into());
     }
 
+
+    fn format_inline_theme(&self, code: &str, theme: &str, syntax: &SyntaxReference) -> String {
+        let theme = &self.theme_set.themes[theme];
+
+        // Essentially the same as `syntect::html::highlighted_html_for_string`,
+        // but adding <code> tags between the <pre> tags
+        // See: https://docs.rs/syntect/5.0.0/src/syntect/html.rs.html#269
+        let mut highlighter = HighlightLines::new(syntax, theme);
+        let (mut output, bg) = start_highlighted_html_snippet(theme);
+        output.push_str("<code>");
+
+        for line in LinesWithEndings::from(code) {
+            let regions = highlighter.highlight_line(line, &self.syntax_set).unwrap();
+            append_highlighted_html_for_styled_line(
+                &regions[..],
+                IncludeBackground::IfDifferent(bg),
+                &mut output,
+            )
+            .unwrap();
+        }
+
+        output.push_str("</code></pre>\n");
+        output
+    }
+
     pub fn format(&self, code: &str, lang: Option<&str>, theme: Option<&str>) -> String {
         if let Some(theme) = theme.or_else(|| self.default_theme()) {
-            let theme = &self.theme_set.themes[theme];
-
             let syntax = lang
                 .and_then(|l| self.syntax_set.find_syntax_by_token(l))
                 .unwrap_or_else(|| self.syntax_set.find_syntax_plain_text());
 
-            // Essentially the same as `syntect::html::highlighted_html_for_string`,
-            // but adding <code> tags between the <pre> tags
-            // See: https://docs.rs/syntect/5.0.0/src/syntect/html.rs.html#269
-            let mut highlighter = HighlightLines::new(syntax, theme);
-            let (mut output, bg) = start_highlighted_html_snippet(theme);
-            output.push_str("<code>");
-
-            for line in LinesWithEndings::from(code) {
-                let regions = highlighter.highlight_line(line, &self.syntax_set).unwrap();
-                append_highlighted_html_for_styled_line(
-                    &regions[..],
-                    IncludeBackground::IfDifferent(bg),
-                    &mut output,
-                )
-                .unwrap();
-            }
-            output.push_str("</code></pre>\n");
-            output
+            self.format_inline_theme(code, theme, syntax)
         } else {
             crate::Raw::new().format(code, lang, theme)
         }