fix case for 0 arg function calls

Signed-off-by: Ava Hahn <ava@aidanis.online>

src/bin/main.rs

@@ -18,7 +18,6 @@
 use dirs::home_dir;
 use relish::ast::{ast_to_string, eval, func_call, lex, new_ast, Ctr, FTable, VTable};
 use relish::aux::configure;
-use relish::stdlib::get_stdlib;
 use rustyline::error::ReadlineError;
 use rustyline::Editor;
 use std::cell::RefCell;
@@ -48,7 +47,7 @@ fn main() {
 
     let vt = Rc::new(RefCell::new(VTable::new()));
     let conf_file;
-    let mut ft;
+    let ft;
     match env::var("RELISH_CFG_FILE") {
         Ok(s) => {
             conf_file = s
@@ -67,11 +66,6 @@ fn main() {
         },
     }
 
-    match get_stdlib(vt.clone()) {
-        Ok(f) => ft = f,
-        Err(s) => println!("{}", s),
-    }
-
     loop {
         let readline: Result<String, ReadlineError>;
         // Rust is pain

src/config.rs

@@ -23,10 +23,12 @@ use crate::stl::get_stdlib;
 use crate::vars::{define, VTable};
 use std::cell::RefCell;
 use std::fs;
+use std::io::{self, Write};
 use std::rc::Rc;
 
 fn prompt_default_callback(_: Ast, _: Rc<RefCell<VTable>>, _: Rc<RefCell<FTable>>) -> Ctr {
     print!("λ ");
+    io::stdout().flush().unwrap();
     return Ctr::None;
 }
 

src/func.rs

@@ -101,7 +101,16 @@ pub fn func_call(
     match &called_func.args {
         Args::Lazy(num) => {
             let called_arg_count = list_len(n_args.clone()) as i128;
-            if *num > -1 && (*num != called_arg_count) {
+            if *num == 0 {
+                if let Ctr::None = n_args.clone().borrow().car {
+                    //pass
+                } else {
+                    return Err(format!(
+                        "expected 0 args in call to {}. Got one or more.",
+                        called_func.name,
+                    ));
+                }
+            } else if *num > -1 && (*num != called_arg_count) {
                 return Err(format!(
                     "expected {} args in call to {}. Got {}.",
                     num, called_func.name, called_arg_count