added rustyline

Cargo.toml

@@ -15,6 +15,7 @@ path = "src/main.rs"
 [dependencies]
 evalexpr = "11.0.0"
 pico-args = "0.5.0"
+rustyline = "14.0.0"
 termion = "1.5.6"
 
 [profile.release]

src/main.rs

@@ -5,6 +5,7 @@ use std::{
 		stdout,
 
 		IsTerminal,
+		Read,
 		Write
 	},
 	process::exit
@@ -18,6 +19,7 @@ use evalexpr::{
 	Value
 };
 use pico_args::Arguments;
+use rustyline::DefaultEditor;
 use termion::{
 	color,
 	style
@@ -43,7 +45,8 @@ fn main() {
 	}
 
 	let mut context = context::build(&mut args);
-	let quiet = args.contains(flag::QUIET) || !stdout().is_terminal();
+	let is_terminal = stdin().is_terminal() && stdout().is_terminal();
+	let quiet = args.contains(flag::QUIET) || !is_terminal;
 
 	//	collect args and evaluate if present
 	let expressions = args.finish();
@@ -53,27 +56,30 @@ fn main() {
 			eval(&expression, &mut context, quiet);
 		}
 	} else {
+		if !is_terminal {
+			let mut buffer = String::with_capacity(0);
+			if let Ok(_) = stdin().read_to_string(&mut buffer) {
+				for expression in buffer.lines() {
+					eval(&expression.to_string(), &mut context, quiet);
+				}
+			}
+		} else if let Ok(mut rl) = DefaultEditor::new() {
 			//	enter interactive mode if no args are given
 			version_text();
 			println!("{}Interactive Mode{}", style::Faint, style::Reset);
 			loop {
-			print!("> ");
-			stdout().flush().unwrap();
-			let mut i_line = String::new();
-			let line_result = stdin().read_line(&mut i_line);
-			if line_result.is_err() {
-				break;
-			}
-			let line = i_line.trim().to_string();
+				if let Ok(line) = rl.readline("> ") {
 					match line.as_str() {
 						""		|
 						"exit"	=>	break,
 						_		=>	eval(&line, &mut context, quiet)
 					}
+				}
 				reset();
 			}
 		}
 	}
+}
 
 fn eval(expression: &str, context: &mut HashMapContext, quiet: bool) {
 	let result = eval_with_context_mut(expression, context);