From dadbf350405967c0bf967eed6686b02c2cf6a048 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Mon, 29 Mar 2021 12:12:46 +0530
Subject: more list primitives, add type_match macro

---
 src/lisp/expr.rs    | 11 +++++++----
 src/lisp/prelude.rs | 47 ++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 49 insertions(+), 9 deletions(-)

diff --git a/src/lisp/expr.rs b/src/lisp/expr.rs
index 059113b..934bb4a 100644
--- a/src/lisp/expr.rs
+++ b/src/lisp/expr.rs
@@ -150,11 +150,13 @@ impl fmt::Display for LispExpr {
             LispExpr::Unit => write!(f, "()")?,
             LispExpr::Number(n) => write!(f, "{}", n)?,
             LispExpr::List(l) => {
-                for expr in l.iter() {
-                    write!(f, " {} ", expr)?
-                }
+                write!(
+                    f,
+                    "({})",
+                    &l.iter().map(|expr| format!("{}", expr)).collect::<Vec<_>>()[..].join(" ")
+                )?;
             }
-            LispExpr::StringLit(s) => write!(f, "{}", s)?,
+            LispExpr::StringLit(s) => write!(f, "{:?}", s)?,
             LispExpr::Char(c) => write!(f, "{}", c)?,
             LispExpr::BoolLit(b) => {
                 if *b {
@@ -243,6 +245,7 @@ impl TryFrom<LispExpr> for String {
     fn try_from(value: LispExpr) -> Result<Self, Self::Error> {
         match value {
             LispExpr::StringLit(i) => Ok(i),
+            LispExpr::Ident(i) => Ok(i),
             _ => Err(LispError::Eval(EvalError::TypeMismatch)),
         }
     }
diff --git a/src/lisp/prelude.rs b/src/lisp/prelude.rs
index 3b8f151..d8a930b 100644
--- a/src/lisp/prelude.rs
+++ b/src/lisp/prelude.rs
@@ -2,6 +2,7 @@ use crate::{
     brush::Brush,
     lisp::{
         error::{EvalError, LispError},
+        eval::eval,
         expr::{is_ident, Arity, LispExpr},
         number::LispNumber,
         Environment,
@@ -24,6 +25,19 @@ macro_rules! primitive {
     };
 }
 
+#[macro_export]
+macro_rules! type_match {
+    ($args:expr, $($range:expr => $kind:pat),+) => {
+        {
+            let mut temp_vec = vec![];
+            $(
+                temp_vec.push(matches!(&$args[$range], $kind));
+            )+
+            temp_vec.iter().all(|&t| t)
+        }
+    }
+}
+
 pub fn new_env() -> Environment {
     let mut env = Environment::new();
 
@@ -172,15 +186,18 @@ pub fn new_env() -> Environment {
     });
 
     primitive!(env, Arity::Exact(1), "string-len", |args, _| {
-        match &args[0] {
-            LispExpr::StringLit(s) => Ok(LispExpr::Number(LispNumber::Integer(s.len() as i64))),
-            _ => Err(EvalError::TypeMismatch.into()),
+        if type_match!(args, 0 => LispExpr::StringLit(_)) {
+            Ok(LispExpr::Number(LispNumber::Integer(
+                args[0].as_ref().len() as i64,
+            )))
+        } else {
+            Err(EvalError::TypeMismatch.into())
         }
     });
 
     primitive!(env, Arity::Atmost(1), "save", |args, app| {
         let image = app.export().encode().unwrap();
-        if args.len() == 1 && matches!(&args[0], LispExpr::StringLit(_)) {
+        if type_match!(args, 0 => LispExpr::StringLit(_)) {
             let mut buffer = File::create(&args[0].as_ref()).unwrap();
             buffer.write_all(&image[..]).unwrap();
         } else if let Some(p) = app.file_name {
@@ -195,7 +212,6 @@ pub fn new_env() -> Environment {
     });
 
     primitive!(env, Arity::Atmost(1), "brush", |args, app| {
-        info!("brush {}", &args[0]);
         let old_size = if matches!(app.brush, Brush::Line { .. } | Brush::Circle { .. }) {
             app.brush.size().unwrap()
         } else {
@@ -217,5 +233,26 @@ pub fn new_env() -> Environment {
         return Ok(LispExpr::Unit);
     });
 
+    primitive!(env, Arity::Exact(2), "map", |args, app| {
+        let mut apply_map =
+            |func: &LispExpr, ls: &Vec<LispExpr>| -> Result<Vec<LispExpr>, LispError> {
+                ls.into_iter()
+                    .map(|arg| eval(&LispExpr::List(vec![func.clone(), arg.clone()]), app))
+                    .collect()
+            };
+        if matches!(&args[0], LispExpr::Function(_) | LispExpr::PrimitiveFunc(_)) {
+            match &args[1] {
+                LispExpr::List(ls) => return Ok(LispExpr::List(apply_map(&args[0], ls)?)),
+                _ => return Err(EvalError::TypeMismatch.into()),
+            }
+        } else {
+            return Err(EvalError::TypeMismatch.into());
+        }
+    });
+
+    primitive!(env, Arity::Atleast(1), "list", |args, _| {
+        return Ok(LispExpr::List(args.to_vec()));
+    });
+
     env
 }
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