From 9d7091ad9db489b4dd646ae7b3b753222593154e Mon Sep 17 00:00:00 2001
From: Stephen Chung <Stephen.Chung@intexact.com>
Date: Thu, 2 Apr 2020 22:37:35 +0800
Subject: [PATCH] Use formatting commands for padding.

---
 examples/repl.rs        |  9 +++------
 examples/rhai_runner.rs | 13 +++++--------
 2 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/examples/repl.rs b/examples/repl.rs
index 4ba75597..def1b310 100644
--- a/examples/repl.rs
+++ b/examples/repl.rs
@@ -9,10 +9,6 @@ use std::{
 };
 
 fn print_error(input: &str, err: EvalAltResult) {
-    fn padding(pad: &str, len: usize) -> String {
-        iter::repeat(pad).take(len).collect::<String>()
-    }
-
     let lines: Vec<_> = input.trim().split('\n').collect();
 
     let line_no = if lines.len() > 1 {
@@ -54,8 +50,9 @@ fn print_error(input: &str, err: EvalAltResult) {
             };
 
             println!(
-                "{}^ {}",
-                padding(" ", line_no.len() + p.position().unwrap() - 1),
+                "{0:>1$} {2}",
+                "^",
+                line_no.len() + p.position().unwrap(),
                 err_text.replace(&pos_text, "")
             );
         }
diff --git a/examples/rhai_runner.rs b/examples/rhai_runner.rs
index 20f6226e..180f51d6 100644
--- a/examples/rhai_runner.rs
+++ b/examples/rhai_runner.rs
@@ -5,10 +5,6 @@ use rhai::OptimizationLevel;
 
 use std::{env, fs::File, io::Read, iter, process::exit};
 
-fn padding(pad: &str, len: usize) -> String {
-    iter::repeat(pad).take(len).collect::<String>()
-}
-
 fn eprint_error(input: &str, err: EvalAltResult) {
     fn eprint_line(lines: &[&str], line: usize, pos: usize, err: &str) {
         let line_no = format!("{}: ", line);
@@ -16,8 +12,9 @@ fn eprint_error(input: &str, err: EvalAltResult) {
 
         eprintln!("{}{}", line_no, lines[line - 1]);
         eprintln!(
-            "{}^ {}",
-            padding(" ", line_no.len() + pos - 1),
+            "{:>1$} {2}",
+            "^",
+            line_no.len() + pos,
             err.replace(&pos_text, "")
         );
         eprintln!("");
@@ -76,9 +73,9 @@ fn main() {
         }
 
         if let Err(err) = engine.consume(false, &contents) {
-            eprintln!("{}", padding("=", filename.len()));
+            eprintln!("{:=<1$}", "", filename.len());
             eprintln!("{}", filename);
-            eprintln!("{}", padding("=", filename.len()));
+            eprintln!("{:=<1$}", "", filename.len());
             eprintln!("");
 
             eprint_error(&contents, err);