feat:

- use rustyline
- add eq code

Cargo.toml

@@ -9,6 +9,7 @@ build = "build.rs"
 [dependencies]
 lalrpop-util = {version = "0.19.9", features = ["lexer"]}
 regex = "1.7.3"
+rustyline = "11.0.0"
 
 # Add a build-time dependency on the lalrpop library:
 [build-dependencies]

examples/syn.meow

@@ -46,9 +46,15 @@ decode(s) {
     rep
 }
 
-m(){
-    var s = "abcd";
+test_code() {
+    var s = "\ab\^^^cd\$$$^$^$^";
     var enc = encode(s);
     var dec = decode(enc);
     dec
 }
+
+eq(x,y) {
+    encode(x) = "F";
+    encode(y) = "T";
+    encode(x)
+}

src/main.rs

@@ -18,11 +18,14 @@ fn main() {
         .expect("unexpected token!");
     let context = &mut Box::new(prog::Context::new());
     prog::eval_prog(res, context);
+    let mut rl = rustyline::DefaultEditor::new().unwrap();
     loop {
         let mut line = String::new();
-        eprint!("> ");
-        std::io::stdin().read_line(&mut line).unwrap();
-        line = line.trim().to_string();
+        let readline = rl.readline("> ");
+        match readline {
+            Ok(l) => line = l.trim().to_string(),
+            Err(_) => println!("invalid input"),
+        }
         let expr = parse::ExpressionParser::new()
             .parse(line.as_str())
             .expect("invalid expression!");