imporved error handling

src/cli.rs

@@ -64,8 +64,6 @@ pub(crate) fn run_cli() {
     };
 
     handle_cli_error(cli_result);
-
-
 }
 
 fn handle_cli_error(cli_result: Result<(), CliError>) {

src/compiler/native_fn/implementations.rs

@@ -60,9 +60,10 @@ pub(crate) fn create_cmd_native_function() -> NativeFunction {
             name: String::from("cmd"),
         },
         executor: |arguments: HashMap<String, ByteBuffer>| {
-            let arg0 = get_argument_at(&arguments, 0)?;
+            let command = get_argument_at(&arguments, 0)?
+                .as_string()
+                .map_err(|e| NativeFunctionError::Unknown(e.to_string()))?;
 
-            let command = arg0.as_string();
             let output = std::process::Command::new(command)
                 .output()
                 .map_err(|e|
@@ -86,7 +87,8 @@ pub(crate) fn create_read_file_native_function() -> NativeFunction {
         executor: |arguments: HashMap<String, ByteBuffer>| {
             let arg0 = get_argument_at(&arguments, 0)?;
 
-            let file_path = arg0.as_string();
+            let file_path = arg0.as_string()
+                .map_err(|e| NativeFunctionError::Unknown(e.to_string()))?;
 
             let mut file = File::open(file_path)
                 .map_err(|e|

src/compiler/util/byte_buffer.rs

@@ -1,5 +1,6 @@
 use crate::compiler::util::encoding::to_shrunk_bytes;
 use std::fmt::{Debug, Formatter};
+use std::string::FromUtf8Error;
 
 #[derive(Clone)]
 pub(crate) struct ByteBuffer {
@@ -67,8 +68,8 @@ impl ByteBuffer {
             (padded.inner[3] as usize)
     }
 
-    pub(crate) fn as_string(&self) -> String {
-        String::from_utf8(self.inner.clone()).unwrap()
+    pub(crate) fn as_string(&self) -> Result<String, FromUtf8Error> {
+        return String::from_utf8(self.inner.clone())
     }
 }