.env dirctive to display environment

src/evaluate.rs

@@ -23,7 +23,7 @@ impl Environment {
         }
     }
 
-    fn display(&self) {
+    pub fn display(&self) {
         match *self {
             Environment(ref hash_map) =>
                 for (var, binding) in hash_map {
@@ -37,7 +37,7 @@ impl Environment {
 
 pub fn evaluate(ast: AST, env: Environment) -> (String, Environment) {
 
-    let (mut reduced_ast, final_env) = reduce((ast, env));
+    let (reduced_ast, final_env) = reduce((ast, env));
 
     let output = match reduced_ast {
         DoNothing => "".to_string(),
@@ -51,7 +51,7 @@ pub fn evaluate(ast: AST, env: Environment) -> (String, Environment) {
 }
 
 fn reduce(evr: EvalResult) -> EvalResult {
-    let (mut ast, mut env) = evr;
+    let (ast, mut env) = evr;
 
     match ast {
         Name(name) => {

src/main.rs

@@ -34,7 +34,7 @@ fn repl() {
                     break;
                 }
 
-                if handle_interpreter_directive(&buf) {
+                if handle_interpreter_directive(&buf, &env) {
                     continue;
                 }
 
@@ -59,7 +59,7 @@ fn repl() {
     }
 }
 
-fn handle_interpreter_directive(input: &str) -> bool {
+fn handle_interpreter_directive(input: &str, env: &Environment) -> bool {
 
     match input.chars().nth(0) {
         Some('.') => (),
@@ -72,6 +72,9 @@ fn handle_interpreter_directive(input: &str) -> bool {
             println!("Siturei simasu");
             process::exit(0);
         },
+        Some(s) if *s == ".env" => {
+            env.display();
+        },
         Some(s) => {
             println!("Unknown directive: {}", s);
         },