minor 'list' optimization

src/command/share.rs

@@ -127,6 +127,7 @@ pub fn list(state: &mut State) {
 	let sessions = util::get_sessions().unwrap_or(Vec::new());
 
 	let search = state.target();
+	let previous = message(MSG_PREVIOUS);
 
 	//	handle empty case
 	if sessions.len() == 0 {
@@ -154,7 +155,7 @@ pub fn list(state: &mut State) {
 			let compare = Some(name.clone());
 			let marker =
 				if compare == state.title { current_symbol.clone() }
-				else if compare == message(MSG_PREVIOUS) { prev_symbol.clone() }
+				else if state.session && compare == previous { prev_symbol.clone() }
 				else { " ".to_string() };
 
 			println!(

src/util.rs

@@ -26,7 +26,8 @@ pub fn message(fstr: &str) -> Option<String> {
 	if let Ok(output) = result {
 		let text = String::from_utf8(output.0.stdout);
 		if let Ok(title) = text {
-			Some(title[0..title.len() - 1].to_owned())
+			if title.len() > 0 { Some(title[0..title.len() - 1].to_owned()) }
+			else { None }
 		} else { None }
 	} else { None }
 }