From fa8d46e3d75a4403219e315982391a99d840bc0e Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Fri, 29 Dec 2017 05:10:03 -0800
Subject: [PATCH] Print operation

---
 src/rukka_lang/mod.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/rukka_lang/mod.rs b/src/rukka_lang/mod.rs
index 7c647bc..ad4b7a1 100644
--- a/src/rukka_lang/mod.rs
+++ b/src/rukka_lang/mod.rs
@@ -23,6 +23,7 @@ impl EvaluatorState {
     default_map.insert(format!("<"), Primitive(Less));
     default_map.insert(format!("<="), Primitive(LessThanOrEqual));
     default_map.insert(format!(">="), Primitive(GreaterThanOrEqual));
+    default_map.insert(format!("display"), Primitive(Display));
 
     EvaluatorState {
       binding_stack: vec![default_map],
@@ -282,7 +283,7 @@ enum Sexp {
 
 #[derive(Debug, PartialEq, Clone)]
 enum PrimitiveFn {
-  Plus, Minus, Mult, Div, Mod, Greater, Less, GreaterThanOrEqual, LessThanOrEqual
+  Plus, Minus, Mult, Div, Mod, Greater, Less, GreaterThanOrEqual, LessThanOrEqual, Display
 }
 
 impl PrimitiveFn {
@@ -291,6 +292,12 @@ impl PrimitiveFn {
     use self::PrimitiveFn::*;
     let op = self.clone();
     Ok(match op {
+      Display => {
+        for arg in evaled_operands {
+          print!("{}\n", arg.print());
+        }
+        Nil
+      },
       Plus | Mult => {
         let mut result = match op { Plus => 0, Mult => 1, _ => unreachable!() };
         for arg in evaled_operands {