changed arg parse to use pico-args

Cargo.toml

@@ -14,6 +14,7 @@ path = "src/main.rs"
 
 [dependencies]
 evalexpr = "11.0.0"
+pico-args = "0.5.0"
 termion = "1.5.6"
 
 [profile.release]

src/main.rs

@@ -15,6 +15,7 @@ use evalexpr::{
 	HashMapContext,
 	Value
 };
+use pico_args::Arguments;
 use termion::{
 	color,
 	style
@@ -27,6 +28,8 @@ mod util;
 pub const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 fn main() {
+	let args = Arguments::from_env();
+
 	//	build eval context
 	let mut context = context_map! {
 		//	globals
@@ -56,9 +59,10 @@ fn main() {
 	}.unwrap();
 
 	//	collect args and evaluate if present
-	let expressions: Vec<String> = env::args().skip(1).collect();
+	let expressions = args.finish();
 	if expressions.len() > 0 {
 		for expression in expressions {
+			let expression: String = expression.to_string_lossy().into();
 			match expression.as_str() {
 				"help"	=>	help_text(),
 				_		=>	do_eval(expression, &mut context)