Added hotkey to reset all data on screen.

README.md

@@ -45,7 +45,9 @@ Currently, I'm unable to really dev or test on MacOS, so I'm not sure how well t
 
 #### General
 
-- `q`, `Ctrl-C` to quit.
+- `q`, `Ctrl-c` to quit.
+
+- `Ctrl-r` to reset the screen and reset all collected data.
 
 - `f` to freeze the screen from updating with new data. Press `f` again to unfreeze. Note that monitoring will still continue in the background.
 
@@ -75,33 +77,6 @@ Currently, I'm unable to really dev or test on MacOS, so I'm not sure how well t
 
 - Scrolling currently only scrolls through the list if you are on the Processes panel. This will change in the future.
 
-## Regarding Process Use Percentage (on Linux)
-
-I cannot guarantee whether they are 100% accurate. I'm using a technique I found online which seems to be a better indicator of process use percentage at the current time, rather than pulling from, say, `ps` (which is average CPU usage over the _entire lifespan_ of the process). I found the options from the library I used to get other data (heim) to be a bit too inaccurate in my testing.
-
-For reference, the formula I am using to calculate CPU process usage is along the lines of:
-
-```rust
-let idle = idle + iowait;
-let non_idle = user + nice + system + irq + softirq + steal + guest;
-
-let total = idle + non_idle;
-let prev_total = prev_idle + prev_non_idle; // Both of these values are calculated using the same formula from the previous polling
-
-let total_delta : f64 = total - prev_total;
-let idle_delta : f64 = idle - prev_idle;
-
-let final_delta : f64 = total_delta - idle_delta;
-
-//...
-
-// Get utime and stime from reading /proc/<PID>/stat
-let after_proc_val = utime + stime;
-(after_proc_val - before_proc_val) / cpu_usage * 100_f64; //This gives your use percentage.  before_proc_val comes from the previous polling
-```
-
-Any suggestions on more accurate data is welcome! Note all other fields should be accurate.
-
 ## Thanks
 
 - As mentioned, this project is very much inspired by both [gotop](https://github.com/cjbassi/gotop) and [gtop](https://github.com/aksakalli/gtop) .

src/canvas.rs

@@ -60,7 +60,8 @@ pub fn draw_data<B : backend::Backend>(terminal : &mut Terminal<B>, app_state :
 		if app_state.show_help {
 			let text = [
 				Text::raw("\nGeneral Keybinds\n"),
-				Text::raw("q, Ctrl-C to quit.\n"),
+				Text::raw("q, Ctrl-c to quit.\n"),
+				Text::raw("Ctrl-r to reset all data.\n"),
 				Text::raw("f to toggle freezing and unfreezing the display.\n"),
 				Text::raw("Up/k, Down/j, Left/h, Right/l to navigate between panels.\n"),
 				Text::raw("Shift+Up and Shift+Down scrolls through the list.\n"),

src/main.rs

@@ -33,6 +33,10 @@ enum Event<I, J> {
 	Update(Box<data_collection::Data>),
 }
 
+enum ResetEvent {
+	Reset,
+}
+
 fn main() -> error::Result<()> {
 	utils::logging::init_logger()?;
 
@@ -156,12 +160,22 @@ fn main() -> error::Result<()> {
 	data_state.init();
 	data_state.set_stale_max_seconds(STALE_MAX_MILLISECONDS / 1000);
 	data_state.set_temperature_type(app.temperature_type.clone());
+	let (rtx, rrx) = mpsc::channel();
 	{
 		let tx = tx.clone();
 		let mut first_run = true;
 		thread::spawn(move || {
 			let tx = tx.clone();
 			loop {
+				if let Ok(message) = rrx.try_recv() {
+					match message {
+						ResetEvent::Reset => {
+							debug!("Received reset message");
+							first_run = true;
+							data_state.data = app::data_collection::Data::default();
+						}
+					}
+				}
 				futures::executor::block_on(data_state.update_data());
 				tx.send(Event::Update(Box::from(data_state.data.clone()))).unwrap();
 				if first_run {
@@ -188,6 +202,12 @@ fn main() -> error::Result<()> {
 						KeyEvent::Char('l') | KeyEvent::Right => app.on_right(),
 						KeyEvent::Char('k') | KeyEvent::Up => app.on_up(),
 						KeyEvent::Char('j') | KeyEvent::Down => app.on_down(),
+						KeyEvent::Ctrl('r') => {
+							while rtx.send(ResetEvent::Reset).is_err() {
+								debug!("Sent reset message.");
+							}
+							debug!("Resetting begins...");
+						}
 						KeyEvent::ShiftUp => app.decrement_position_count(),
 						KeyEvent::ShiftDown => app.increment_position_count(),
 						KeyEvent::Char(c) => app.on_key(c),
@@ -228,6 +248,7 @@ fn main() -> error::Result<()> {
 					// debug!("Update event fired!");
 					if !app.is_frozen {
 						app.data = *data;
+
 						data_collection::processes::sort_processes(
 							&mut app.data.list_of_processes,
 							&app.process_sorting_type,