Add EvalAltResult::clear_position().

RELEASES.md

@@ -16,6 +16,7 @@ Enhancements
 
 * Source information is provided when there is an error within a call to a function defined in another module.
 * Source information is provided to the `NativeCallContext` for native Rust functions.
+* `EvalAltResult::clear_position` to clear the position information of an error - useful when only the message is needed and the position doesn't need to be printed out.
 
 
 Version 0.19.9

src/bin/rhai-repl.rs

@@ -11,9 +11,10 @@ use std::{
 };
 
 /// Pretty-print error.
-fn print_error(input: &str, err: EvalAltResult) {
+fn print_error(input: &str, mut err: EvalAltResult) {
     let lines: Vec<_> = input.trim().split('\n').collect();
     let pos = err.position();
+    err.clear_position();
 
     let line_no = if lines.len() > 1 {
         if pos.is_none() {
@@ -26,8 +27,6 @@ fn print_error(input: &str, err: EvalAltResult) {
     };
 
     // Print error position
-    let pos_text = format!(" ({})", pos);
-
     if pos.is_none() {
         // No position
         println!("{}", err);
@@ -40,7 +39,7 @@ fn print_error(input: &str, err: EvalAltResult) {
             "{0:>1$} {2}",
             "^",
             line_no.len() + pos.position().unwrap(),
-            err.to_string().replace(&pos_text, "")
+            err
         );
     }
 }

src/bin/rhai-run.rs

@@ -5,19 +5,17 @@ use rhai::OptimizationLevel;
 
 use std::{env, fs::File, io::Read, process::exit};
 
-fn eprint_error(input: &str, err: EvalAltResult) {
-    fn eprint_line(lines: &[&str], pos: Position, err: &str) {
+fn eprint_error(input: &str, mut err: EvalAltResult) {
+    fn eprint_line(lines: &[&str], pos: Position, err_msg: &str) {
         let line = pos.line().unwrap();
-
         let line_no = format!("{}: ", line);
-        let pos_text = format!(" ({})", pos);
 
         eprintln!("{}{}", line_no, lines[line - 1]);
         eprintln!(
             "{:>1$} {2}",
             "^",
             line_no.len() + pos.position().unwrap(),
-            err.replace(&pos_text, "")
+            err_msg
         );
         eprintln!("");
     }
@@ -26,6 +24,7 @@ fn eprint_error(input: &str, err: EvalAltResult) {
 
     // Print error
     let pos = err.position();
+    err.clear_position();
 
     if pos.is_none() {
         // No position

src/result.rs

@@ -366,6 +366,11 @@ impl EvalAltResult {
             | Self::Return(_, pos) => *pos,
         }
     }
+    /// Clear the [position][Position] information of this error.
+    pub fn clear_position(&mut self) -> &mut Self {
+        self.set_position(Position::NONE);
+        self
+    }
     /// Override the [position][Position] of this error.
     pub fn set_position(&mut self, new_position: Position) {
         match self {