1 files changed, 20 insertions, 1 deletions

diff --git a/src/lisp/prelude.rs b/src/lisp/prelude.rs
index 6153e4f..d2a6ae6 100644
--- a/src/lisp/prelude.rs
+++ b/src/lisp/prelude.rs
@@ -1,7 +1,8 @@
 use crate::{
+    brush::Brush,
     lisp::{
         error::{EvalError, LispError},
-        expr::{Arity, LispExpr},
+        expr::{is_ident, Arity, LispExpr},
         number::LispNumber,
         Environment,
     },
@@ -193,5 +194,23 @@ pub fn new_env() -> Environment {
         return Ok(LispExpr::Unit);
     });
 
+    primitive!(env, Arity::Atmost(1), "brush", |args, app| {
+        info!("brush {}", &args[0]);
+        if let [LispExpr::Quote(kind, _)] = args {
+            if is_ident(kind) {
+                match (&**kind).as_ref() {
+                    "fill" => app.brush = Brush::Fill,
+                    "circle" => app.brush = Brush::new(),
+                    "line" => app.brush = Brush::line(0, false),
+                    "line-extend" => app.brush = Brush::line(0, true),
+                    _ => return Err(EvalError::CustomInternal("unknown brush type").into()),
+                }
+            }
+        } else {
+            return Err(EvalError::TypeMismatch.into());
+        }
+        return Ok(LispExpr::Unit);
+    });
+
     env
 }