Apply some optimizations

src/main.rs

@@ -20,7 +20,7 @@ struct Frontmatter {
 }
 
 // The struct representing the page, as constructed from the frontmatter
-#[derive(Clone, Serialize)]
+#[derive(Serialize)]
 struct Page {
     title: String,
     permalink: String,
@@ -111,10 +111,21 @@ fn main() {
         }
     };
 
+    let liquid_parser = liquid::ParserBuilder::with_stdlib()
+        .build().expect("calathea: failed to build liquid parser");
+
+    let liquid_template = match liquid_parser.parse(template.as_str()) {
+        Ok(t) => t,
+        Err(e) => {
+            println!("calathea: failed to parse template '{}': {}", template_path.display(), e);
+            process::exit(1);
+        }
+    };
+
     let mut page_map: HashMap<String, Page> = HashMap::new();
     let mut content_map: HashMap<String, String> = HashMap::new();
 
-    let mut incoming_map: HashMap<String, Vec<Page>> = HashMap::new();
+    let mut incoming_map: HashMap<String, Vec<&Page>> = HashMap::new();
 
     // Pull the source files into memory
     let src_paths = match fs::read_dir(src_dir) {
@@ -207,7 +218,7 @@ fn main() {
 
             let incoming_pages = incoming_map.get_mut(&name).unwrap();
 
-            incoming_pages.push(page.clone());
+            incoming_pages.push(page);
         }
 
         content_map.insert(page.title.clone(), link_re.replace_all(original_content.as_str(), |caps: &Captures| {
@@ -231,19 +242,8 @@ fn main() {
     md_options.extension.footnotes = true;
     md_options.extension.front_matter_delimiter = Some("---".to_owned());
 
-    let liquid_parser = liquid::ParserBuilder::with_stdlib()
-        .build().expect("calathea: failed to build liquid parser");
-
-    let liquid_template = match liquid_parser.parse(template.as_str()) {
-        Ok(t) => t,
-        Err(e) => {
-            println!("calathea: failed to parse template '{}': {}", template_path.display(), e);
-            process::exit(1);
-        }
-    };
-
     for page in page_map.values() {
-        let incoming_pages: &Vec<Page> = incoming_map.get(&page.title).unwrap();
+        let incoming_pages = incoming_map.get(&page.title).unwrap();
         let content = content_map.get(&page.title).unwrap();
 
         let globals = liquid::object!({