X-Git-Url: https://harishankar.org/repos/?p=evpf.git;a=blobdiff_plain;f=src%2Fmain.rs;h=51ea94eb5e681337e5b6ecb386c8f81771fcb528;hp=8e54265b3c76a73fe7ff037aed19063e77ff94ef;hb=975d99c3ed4aa48ca49857841ff80f4e732c3b1b;hpb=a86a7c0712840275401e5ccd79322f3575b918fb

diff --git a/src/main.rs b/src/main.rs
index 8e54265..51ea94e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -195,7 +195,10 @@ fn run_interactive_mode (match_num : &regex::Regex) {
 	let mut expr = String::new ();
 
 	let mut rl = Editor::<()>::new ();
+	
+	// load the history file
 	let hist_file = get_history_file ();
+	// if unable to load the history file, display the appropriate error
 	if hist_file.is_err () {
 		eprintln! ("{}", &hist_file.unwrap_err());
 	} else {
@@ -251,14 +254,16 @@ fn run_interactive_mode (match_num : &regex::Regex) {
 		if rl.save_history (&hist_file.unwrap()).is_err () {
 			eprintln! ("{}", SAVE_HISTORY_ERROR);
 		}
-	} 
+	} else {
+		eprintln! ("{}", &hist_file.unwrap_err());
+	}
 }
 
 fn main() {
 	// collect the command line arguments - if any 
 	let args : Vec<String> = env::args().collect ();
 	// regular expression to match a number 
-	let match_num = Regex::new (r"^\d+?\.*?\d*?$").unwrap ();
+	let match_num = Regex::new (r"^\-?\d+?\.*?\d*?$").unwrap ();
 	
 	if args.len () > 1 {
 	// if arguments are provided run in command line mode - i.e. print the