Implemented AMBER_HEADER and AMBER_FOOTER variables

src/compiler.rs

@@ -199,10 +199,30 @@ impl AmberCompiler {
         }
 
         let now = Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
-        let header = include_str!("header.sh")
+
+        let header_template = 
+            if let Ok(dynamic) = env::var("AMBER_HEADER") {
+                fs::read_to_string(dynamic.to_string()).expect(format!("Couldn't read the dynamic header file from {dynamic}").as_str())
+            } else {
+                include_str!("header.sh").to_string()
+            };
+
+        let footer_template = 
+            if let Ok(dynamic) = env::var("AMBER_FOOTER") {
+                fs::read_to_string(dynamic.to_string()).expect(format!("Couldn't read the dynamic footer file from {dynamic}").as_str())
+            } else {
+                String::new()
+            };
+
+        let header = header_template
+            .replace("{{ version }}", env!("CARGO_PKG_VERSION"))
+            .replace("{{ date }}", now.as_str());
+
+        let footer = footer_template
             .replace("{{ version }}", env!("CARGO_PKG_VERSION"))
             .replace("{{ date }}", now.as_str());
-        Ok(format!("{}{}", header, result))
+
+        Ok(format!("{}\n{}\n{}", header, result, footer))
     }
 
     pub fn document(&self, block: Block, meta: ParserMetadata, output: Option<String>) {

src/header.sh

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 # Written in [Amber](https://amber-lang.com/)
 # version: {{ version }}
-# date: {{ date }}
+# date: {{ date }}