Implemented cmd runtime expansion for the prompt

src/shellenv/meta.rs

@@ -1,8 +1,9 @@
 use std::time::{Duration, Instant};
+use crate::prelude::*;
 
 #[derive(Clone,Debug)]
 pub struct MetaTab {
-	timer_start: Option<Instant>,
+	timer_start: Instant,
 	last_runtime: Option<Duration>,
 	last_status: i32
 }
@@ -10,19 +11,16 @@ pub struct MetaTab {
 impl MetaTab {
 	pub fn new() -> Self {
 		Self {
-			timer_start: None,
+			timer_start: Instant::now(),
 			last_runtime: None,
 			last_status: 0
 		}
 	}
 	pub fn start_timer(&mut self) {
-		self.timer_start = Some(Instant::now())
+		self.timer_start = Instant::now();
 	}
 	pub fn stop_timer(&mut self) {
-		let timer_start = self.timer_start.take();
-		if let Some(instant) = timer_start {
-			self.last_runtime = Some(instant.elapsed())
-		}
+		self.last_runtime = Some(self.timer_start.elapsed());
 	}
 	pub fn get_runtime(&self) -> Option<Duration> {
 		self.last_runtime