Fixing division

Previously was returning error on
- (/ 0 n) with error: attempting division by zero

Makefile

@@ -23,6 +23,10 @@ conf: test
 	@test -s ${CONFIG_FILE} || (\
 		echo ";; Write here your mal config" >> ${MAL_HOME}/config.mal\
 		&& echo "; (def! BANNER \"\") ; Hide banner at startup" >> ${MAL_HOME}/config.mal\
+		&& echo '' >> ${MAL_HOME}/config.mal\
+		&& echo '(def! BANNER (str BANNER' >> ${MAL_HOME}/config.mal\
+	    && echo '";\n; **** To remove this banner and config mal, edit: ****\n"' >> ${MAL_HOME}/config.mal\
+		&& echo '";     /Users/rogora/.config/mal/config.mal\n"))' >> ${MAL_HOME}/config.mal\
 	)
 
 install: build-release test conf
@@ -41,4 +45,4 @@ install: build-release test conf
 	@echo "To start mal run:"
 	@printf "\tmal [path/to/script [args ...]]\n\n"
 	@echo "To config mal edit:"
-	@printf "\t${MAL_HOME}/config.mal"
+	@printf "\t${MAL_HOME}/config.mal\n"

core/core.mal

@@ -51,6 +51,12 @@
 (def! empty? (fn* [l]
     (= (count l) 0)))
 
+(def! ceil (fn* [n]
+    (if (= (num n) 1)
+        n
+        (+ (floor n) 1))))
+
+; Other functions
 (def! assert-msg (fn* [e m]
     (if (not e)
         (raise m))))

libs/string.mal

@@ -23,13 +23,13 @@
 (def! _split-ch (fn* [s c]
     "Split the string at every occurrence of character sc"
     (def! s (boom s))
-    (def! split-r (fn* [l t r]
+    (def! split-r (fn* [l tt r]
         (if (empty? l)
-            (cons t r)
+            (cons tt r)
             (do (def! cc (car l))
                 (if (= cc c)
-                    (split-r (cdr l) "" (cons t r))
-                    (split-r (cdr l) (str t cc) r))))))
+                    (split-r (cdr l) "" (cons tt r))
+                    (split-r (cdr l) (str tt cc) r))))))
     (reverse (split-r s "" '()))))
 
 (def! split (fn* [string delimiter]
@@ -53,10 +53,10 @@
 (def! join (fn* [l s]
     "Join element of list l to a stiring, using s as separator"
     (def! s (or s ""))
-    (def! join-r (fn* [l t]
+    (def! join-r (fn* [l tt]
         (if (empty? l)
-            t
-            (join-r (cdr l) (str t s (car l))))))
+            tt
+            (join-r (cdr l) (str tt s (car l))))))
     (join-r (cdr l) (car l))))
 
 (def! chsub (fn* [s c1 c2]

src/core.rs

@@ -70,7 +70,7 @@ pub fn ns_init() -> Env {
         "<="            => Fun(|a| comparison_op(   |a, b| a <= b, a), "Returns true if the first argument is smaller than or equal to the second one, nil otherwise"),
         ">="            => Fun(|a| comparison_op(   |a, b| a >= b, a), "Returns true if the first argument is greater than or equal to the second one, nil otherwise"),
         "pr-str"        => Fun(|a| Ok(Str(a.iter().map(|i| pr_str(i, true)).collect::<Vec<String>>().join("").into())), "Print readably all arguments"),
-        "str"           => Fun(|a| Ok(Str(a.iter().map(|i| pr_str(i, false)).collect::<Vec<String>>().join("").into())), "Print non readably all arguments"),
+        "str"           => Fun(|a| Ok(Str(a.iter().map(|i| pr_str(i, false)).collect::<Vec<String>>().join("").into())), "Concatenate all arguments as a string"),
         "prn"           => Fun(|a| {a.iter().for_each(|a| print!("{}", pr_str(a, false))); let _ = io::stdout().flush(); Ok(Nil) }, "Print readably all the arguments"),
         "println"       => Fun(|a| {a.iter().for_each(|a| print!("{}", pr_str(a, false))); println!(); Ok(Nil) }, "Print readably all the arguments"),
         "list"          => Fun(|a| Ok(List(a.into())), "Return the arguments as a list"),

src/env.rs

@@ -57,7 +57,7 @@ pub fn env_get(env: &Env, sym: &str) -> MalRet {
 
 pub fn env_binds(outer: Env, binds: &MalType, exprs: &[MalType]) -> Result<Env, MalErr> {
     let env = env_new(Some(outer));
-    let binds = binds.if_vec()?;
+    let binds = binds.if_list()?;
     let binl = binds.len();
     let expl = exprs.len();
     if binl < expl {
@@ -150,13 +150,25 @@ pub fn call_func(func: &MalType, args: &[MalType]) -> CallRet {
 }
 
 pub fn any_zero(list: &[MalType]) -> Result<&[MalType], MalErr> {
-    if list
+    match list.len() {
+        1 => {
+            if list[0].if_number()?.get_num() == 0 {
+                Err(MalErr::unrecoverable("Attempting division by 0"))
+            } else {
+                Ok(list)
+            }
+        }
+        _ => {
+            if list[1..list.len()]
                 .iter()
                 .any(|x| matches!(x, M::Num(v) if v.exact_zero()))
             {
-        return Err(MalErr::unrecoverable("Attempting division by 0"));
-    }
+                Err(MalErr::unrecoverable("Attempting division by 0"))
+            } else {
                 Ok(list)
+            }
+        }
+    }
 }
 
 pub fn arithmetic_op(set: isize, f: fn(Frac, Frac) -> Frac, args: &[MalType]) -> MalRet {

src/eval.rs

@@ -75,7 +75,7 @@ fn let_star_form(list: &[MalType], env: Env) -> Result<(MalType, Env), MalErr> {
     let inner_env = env_new(Some(env.clone()));
     // change the inner environment
     let (car, cdr) = car_cdr(list)?;
-    let list = car.if_vec()?;
+    let list = car.if_list()?;
     if list.len() % 2 != 0 {
         return Err(MalErr::unrecoverable(
             "let* form, number of arguments must be even",
@@ -114,7 +114,7 @@ fn if_form(list: &[MalType], env: Env) -> MalRet {
 
 fn fn_star_form(list: &[MalType], env: Env) -> MalRet {
     let (binds, exprs) = car_cdr(list)?;
-    binds.if_vec()?;
+    binds.if_list()?;
     Ok(M::MalFun {
         // eval: eval_ast,
         params: Rc::new(binds.clone()),

src/parse_tools.rs

@@ -71,7 +71,18 @@ use rustyline::error::ReadlineError;
 use rustyline::DefaultEditor;
 
 pub fn pre_load(argv: &Vec<String>, env: &Env) {
-    eval_str(format!("(def! *ARGV* '({}))", argv[1..].iter().map(|x| x.to_string() + " ").collect::<String>()).as_str(), &env).unwrap();
+    eval_str(
+        format!(
+            "(def! *ARGV* '({}))",
+            argv[1..]
+                .iter()
+                .map(|x| "\"".to_string() + x + "\" ")
+                .collect::<String>()
+        )
+        .as_str(),
+        &env,
+    )
+    .unwrap();
 }
 
 pub fn interactive(env: Env) {

src/types.rs

@@ -105,6 +105,10 @@ impl Frac {
         return a;
     }
 
+    // Ideally builtin functions ( + - * / ) can operate with the values in any
+    // form without problems, occasional simplification is done for numeric
+    // stability, ensure to simplify after insert and before using any funcition
+    // (floor, ceil, etc.)
     pub fn simplify(&self) -> Frac {
         // Euclid's algorithm to reduce fraction
         // TODO: (decide if implementing this automathically once fraction
@@ -130,13 +134,19 @@ impl Frac {
     // return Ok(Num(Frac::num(tk.parse::<isize>().unwrap())));
 
     pub fn from_str(tk: &str) -> Self {
-        match tk.find("/") {
+        let frac = match tk.find("/") {
             Some(v) => Self {
                 num: tk[0..v].parse::<isize>().unwrap(),
                 den: tk[v + 1..tk.len()].parse::<usize>().unwrap(),
             },
             None => Frac::num(tk.parse::<isize>().unwrap()),
-        }
+        };
+        // Ensure that value is simplified before being inserted
+        // otherwise
+        // (/ 4 4)  results in 1/1
+        // 4/4      results in 4/4
+        // this breaks some functions (like ceil) and doesn't make much sense
+        frac.simplify()
     }
 }
 
@@ -182,9 +192,9 @@ impl MalType {
 
     pub fn if_list(&self) -> Result<&[MalType], MalErr> {
         match self {
-            Self::List(list) => Ok(list),
+            Self::List(list) | Self::Vector(list) => Ok(list),
             _ => Err(MalErr::unrecoverable(
-                format!("{:?} is not a list", prt(self)).as_str(),
+                format!("{:?} is not an iterable", prt(self)).as_str(),
             )),
         }
     }

test.mal

@@ -0,0 +1 @@
+(println *ARGV*)