Move business logic out of main, use askama and bound the ENTRIES

src/highlight.rs

@@ -0,0 +1,21 @@
+extern crate syntect;
+
+use syntect::parsing::SyntaxSet;
+use syntect::highlighting::ThemeSet;
+use syntect::easy::HighlightLines;
+use syntect::html::{styled_line_to_highlighted_html, IncludeBackground};
+
+/// Takes the content of a paste and the extension passed in by the viewer and will return the content
+/// highlighted in the appropriate format in HTML.
+pub fn highlight(content: &str, ext: &str) -> Option<String> {
+    lazy_static! {
+        static ref SS: SyntaxSet = SyntaxSet::load_defaults_newlines();
+        static ref TS: ThemeSet = ThemeSet::load_defaults();
+    }
+
+    let syntax = SS.find_syntax_by_extension(ext)?;
+    let mut h = HighlightLines::new(syntax, &TS.themes["base16-ocean.dark"]);
+    let regions = h.highlight(content, &SS);
+
+    Some(styled_line_to_highlighted_html(&regions[..], IncludeBackground::No))
+}