X-Git-Url: https://harishankar.org/repos/?p=evpf.git;a=blobdiff_plain;f=src%2Fmain.rs;fp=src%2Fmain.rs;h=f46dfab5f3a1c73df48d5e1146323c099c7978dc;hp=d2371937b73204e75fae8da3dc96fba43fbc461e;hb=8a5044a6aba2dea15733f830988887d6d4f5ca2a;hpb=e12e35ce57fb851e14e6589959c622512a9d1091

diff --git a/src/main.rs b/src/main.rs
index d237193..f46dfab 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,15 +1,12 @@
-use std::io;
-use std::io::Write;
 use regex::Regex;
 use colored::*;
 use std::env;
+use rustyline::Editor;
 
 const ILLEGAL_EXP : &'static str = "Illegal Expression";
 const ERR_PARSING_NOT_MATCH : &'static str = "Error parsing expression! \
 				 Must be a number or operator (+,-,* or /)";
 const ERR_POSTFIX_INCOMPLETE : &'static str = "Postfix expression incomplete!";
-const ERR_FLUSHING : &'static str = "Error flushing!";
-const ERR_READING_LINE : &'static str = "Error reading line!";
 const HELP_TEXT : [&str ; 4] = 
 				["Type a postfix expression to evaluate.",
 				 "Example: 4 5 + 12 -",
@@ -165,15 +162,18 @@ fn run_interactive_mode (match_num : &regex::Regex) {
 	// get a line from input and evaluate it 
 	let mut expr = String::new ();
 
+	let mut rl = Editor::<()>::new ();
 	// loop until a blank line is received	
 	loop {
-		expr.clear ();	
-		print!("{}", "evpf>".bold() );
-		io::stdout().flush ().expect (ERR_FLUSHING);
-		// read a line of text
-		io::stdin().read_line (&mut expr).expect (ERR_READING_LINE);
-		// trim the text
-		let expr = expr.trim ();
+		expr.clear ();
+		
+		let line = rl.readline ("evpf> ");
+		if line.is_err () {
+			break;
+		}
+		let hist = line.unwrap ();
+		rl.add_history_entry (&hist);
+		expr.push_str (&hist);
 
 		if expr == "q" || expr == "Q" {
 		// quit if the expression is q or Qs