add eval_file

examples/eval_file.rs

@@ -0,0 +1,60 @@
+use std::{process::exit, env, fs};
+
+use brainrust::*;
+
+fn dump_mem(memory: &[u8]) -> String {
+
+
+    let mut out: String = "Memory dump:\n{ ".into();
+
+    let mut i = 0;
+
+    for byte in memory.iter() {
+        if *byte == 0 && i > 50 { break }
+        out += format!("{}, ", byte).as_str();
+        i += 1;
+    }
+    // remove the last ", "
+    out.pop();
+    out.pop();
+
+    out += " }";
+
+    out
+}
+
+fn main() {
+
+    // read file
+    
+    let file = env::args().collect::<Vec<String>>();
+    let file = file.get(1);
+    if file.is_none() {
+        eprintln!("Please specify file as 1st argument");
+        exit(-1);
+    }
+    let file = file.unwrap();
+
+    let file = fs::read_to_string(file).unwrap();
+    
+    // done reading file; actual shit here
+
+    let mut memory: [u8; 30000] = core::array::from_fn(|_| 0);
+    let mut pointer = 0 as usize;
+
+    let eval_res = eval_mem(&file.as_str(), &mut memory, &mut pointer);
+
+    // print error if there is any
+
+    if eval_res.is_err() {
+        let err = eval_res.unwrap_err();
+        eprintln!("Program failed: {}", err.error);
+        println!("{}", dump_mem(&memory));
+        println!("Pointer is {}", pointer);
+        exit(-1);
+    }
+
+    // dump memory (for dev purposes)
+
+    // println!("{}", dump_mem(&memory));
+}