Add flag to enable by default, documentation

README.md

@@ -57,6 +57,8 @@ The compatibility of each widget and operating systems are, as of version 0.1.0,
 
 - `-u`, `--current_usage` will make a process' CPU usage be based on the current total CPU usage, rather than assuming 100% CPU usage. Only affects Linux for now.
 
+- `g`, `--group` will group together processes with the same name by default (equivalent to pressing `Tab`).
+
 ### Keybindings
 
 #### General
@@ -93,6 +95,8 @@ The compatibility of each widget and operating systems are, as of version 0.1.0,
 
 - `n` to sort by process name. Sorts in ascending order by default. Press again to reverse sorting order.
 
+- `Tab` to group together processes with the same name. Disables PID sorting. `dd` will now kill all processes covered by that name.
+
 ### Mouse actions
 
 - Scrolling with the mouse will scroll through the currently selected list, similar to using the up/down arrow keys.

src/app.rs

@@ -124,6 +124,14 @@ impl App {
 		}
 	}
 
+	pub fn on_tab(&mut self) {
+		match self.current_application_position {
+			ApplicationPosition::Process => self.toggle_grouping(),
+			ApplicationPosition::Disk => {}
+			_ => {}
+		}
+	}
+
 	pub fn is_grouped(&self) -> bool {
 		self.enable_grouping
 	}

src/canvas.rs

@@ -19,7 +19,7 @@ const HIGHLIGHTED_BORDER_STYLE_COLOUR: Color = Color::LightBlue;
 const GOLDEN_RATIO: f32 = 0.618_034; // Approx, good enough for use (also Clippy gets mad if it's too long)
 
 lazy_static! {
-	static ref HELP_TEXT: [Text<'static>; 14] = [
+	static ref HELP_TEXT: [Text<'static>; 15] = [
 		Text::raw("\nGeneral Keybindings\n"),
 		Text::raw("q, Ctrl-c to quit.\n"),
 		Text::raw("Ctrl-r to reset all data.\n"),
@@ -36,6 +36,7 @@ lazy_static! {
 		Text::raw("m to sort by memory usage.\n"),
 		Text::raw("p to sort by PID.\n"),
 		Text::raw("n to sort by process name.\n"),
+		Text::raw("`Tab` to group together processes with the same name.\n")
 	];
 	static ref COLOUR_LIST: Vec<Color> = gen_n_colours(constants::NUM_COLOURS);
 	static ref CANVAS_BORDER_STYLE: Style = Style::default().fg(BORDER_STYLE_COLOUR);

src/main.rs

@@ -72,6 +72,7 @@ fn main() -> error::Result<()> {
 		(@arg USE_CURR_USAGE: -u --current_usage "Within Linux, sets a process' CPU usage to be based on the total current CPU usage, rather than assuming 100% usage.")
 		//(@arg CONFIG_LOCATION: -co --config +takes_value "Sets the location of the config file.  Expects a config file in the JSON format.")
 		(@arg BASIC_MODE: -b --basic "Sets bottom to basic mode, not showing graphs and only showing basic tables.")
+		(@arg GROUP_PROCESSES: -g --group "Groups processes with the same name together on launch.")
 	)
 	.get_matches();
 
@@ -123,6 +124,11 @@ fn main() -> error::Result<()> {
 		use_current_cpu_total,
 	);
 
+	// Enable grouping immediately if set.
+	if matches.is_present("GROUP_PROCESSES") {
+		app.toggle_grouping();
+	}
+
 	// Set up up tui and crossterm
 	let mut stdout = stdout();
 	enable_raw_mode()?;
@@ -219,7 +225,7 @@ fn main() -> error::Result<()> {
 							KeyCode::Char(uncaught_char) => app.on_char_key(uncaught_char),
 							KeyCode::Esc => app.reset(),
 							KeyCode::Enter => app.on_enter(),
-							KeyCode::Tab => app.toggle_grouping(),
+							KeyCode::Tab => app.on_tab(),
 							_ => {}
 						}
 					} else {
@@ -299,6 +305,15 @@ fn main() -> error::Result<()> {
 				}
 			}
 		}
+
+		// Quick fix for tab updating the table headers
+		if let data_collection::processes::ProcessSorting::PID = &app.process_sorting_type {
+			if app.is_grouped() {
+				app.process_sorting_type = data_collection::processes::ProcessSorting::CPU; // Go back to default, negate PID for group
+				app.process_sorting_reverse = true;
+			}
+		}
+
 		// Draw!
 		if let Err(err) = canvas::draw_data(&mut terminal, &mut app) {
 			cleanup(&mut terminal)?;
@@ -361,16 +376,20 @@ fn handle_process_sorting(app: &mut app::App) {
 	);
 
 	if let Some(grouped_list_of_processes) = &mut app.data.grouped_list_of_processes {
+		if let data_collection::processes::ProcessSorting::PID = &app.process_sorting_type {
 			data_collection::processes::sort_processes(
 				grouped_list_of_processes,
-			if let data_collection::processes::ProcessSorting::PID = &app.process_sorting_type {
-				&data_collection::processes::ProcessSorting::CPU // Go back to default, negate PID for group
+				&data_collection::processes::ProcessSorting::CPU, // Go back to default, negate PID for group
+				true,
+			);
 		} else {
-				&app.process_sorting_type
-			},
+			data_collection::processes::sort_processes(
+				grouped_list_of_processes,
+				&app.process_sorting_type,
 				app.process_sorting_reverse,
 			);
 		}
+	}
 
 	data_collection::processes::sort_processes(
 		&mut app.data.list_of_processes,