Merge branch 'master' into populate-config

.github/pull_request_template.md

@@ -14,6 +14,7 @@ _Remove the irrelevant one:_
 
 - [x] Bug fix (non-breaking change which fixes an issue)
 - [x] New feature (non-breaking change which adds functionality)
+- [x] Other (something else)
 
 ## Test methodology
 
@@ -24,10 +25,11 @@ _Please state how this was tested:_
 _Please ensure all are ticked (and actually done):_
 
 - [ ] Change has been tested to work
-- [ ] Code has been linted using rustfmt
+- [ ] Areas your change affects has been linted using rustfmt
 - [ ] Code has been self-reviewed
 - [ ] Code has been tested and no new breakage is introduced
 - [ ] Documentation has been added/updated if needed
+- [ ] No merge conflicts arise from the change
 
 ## Other information
 

.gitignore

@@ -15,5 +15,6 @@ Cargo.lock
 rust-unmangle
 *.svg
 *.data
+.idea/
 
 sample_configs/testing.toml

Cargo.toml

@@ -30,7 +30,6 @@ heim = "0.0.10"
 log = "0.4.8"
 regex = "1.3.4"
 sysinfo = "0.11"
-winapi = "0.3.8"
 crossterm = "0.16"
 tui = {version = "0.8", features = ["crossterm"], default-features = false }
 lazy_static = "1.4.0"
@@ -40,6 +39,9 @@ serde = {version = "1.0", features = ["derive"] }
 unicode-segmentation = "1.6.0"
 unicode-width = "0.1.7"
 
+[target.'cfg(windows)'.dependencies]
+winapi = "0.3.8"
+
 [dev-dependencies]
 assert_cmd = "0.12"
 predicates = "1"

README.md

@@ -206,7 +206,7 @@ Note that `q` is disabled while in the search widget.
 
 ## Contribution
 
-Contribution is welcome! Just submit a PR.
+Contribution is welcome! Just submit a PR. Note that I develop and test on stable Rust.
 
 If you spot any issue with nobody assigned to it, or it seems like no work has started on it, feel free to try and do it!
 

rustfmt.toml

@@ -3,12 +3,7 @@ max_width = 100
 newline_style = "Unix"
 reorder_imports = true
 fn_args_layout = "Compressed"
-empty_item_single_line = false
 hard_tabs = true
-merge_imports = true
 merge_derives = true
 reorder_modules = true
-reorder_impl_items = true
 tab_spaces = 4
-format_strings = true
-space_after_colon = true

src/app.rs

@@ -1,15 +1,16 @@
-pub mod data_harvester;
-use data_harvester::{processes, temperature};
 use std::time::Instant;
 
-pub mod data_farmer;
+use unicode_segmentation::GraphemeCursor;
+use unicode_width::{UnicodeWidthChar, UnicodeWidthStr};
+
 use data_farmer::*;
+use data_harvester::{processes, temperature};
 
 use crate::{canvas, constants, utils::error::Result};
-mod process_killer;
 
-use unicode_segmentation::{GraphemeCursor};
-use unicode_width::UnicodeWidthStr;
+pub mod data_farmer;
+pub mod data_harvester;
+mod process_killer;
 
 const MAX_SEARCH_LENGTH: usize = 200;
 
@@ -33,7 +34,7 @@ pub enum ScrollDirection {
 }
 
 #[derive(Debug)]
-pub enum SearchDirection {
+pub enum CursorDirection {
 	LEFT,
 	RIGHT,
 }
@@ -73,6 +74,10 @@ pub struct AppSearchState {
 	pub is_blank_search: bool,
 	pub is_invalid_search: bool,
 	pub grapheme_cursor: GraphemeCursor,
+	pub cursor_direction: CursorDirection,
+	pub cursor_bar: usize,
+	/// This represents the position in terms of CHARACTERS, not graphemes
+	pub char_cursor_position: usize,
 }
 
 impl Default for AppSearchState {
@@ -84,11 +89,21 @@ impl Default for AppSearchState {
 			is_invalid_search: false,
 			is_blank_search: true,
 			grapheme_cursor: GraphemeCursor::new(0, 0, true),
+			cursor_direction: CursorDirection::RIGHT,
+			cursor_bar: 0,
+			char_cursor_position: 0,
 		}
 	}
 }
 
 impl AppSearchState {
+	/// Returns a reset but still enabled app search state
+	pub fn reset() -> Self {
+		let mut app_search_state = AppSearchState::default();
+		app_search_state.is_enabled = true;
+		app_search_state
+	}
+
 	pub fn is_invalid_or_blank_search(&self) -> bool {
 		self.is_blank_search || self.is_invalid_search
 	}
@@ -549,6 +564,10 @@ impl App {
 			.cur_cursor()
 	}
 
+	pub fn get_char_cursor_position(&self) -> usize {
+		self.process_search_state.search_state.char_cursor_position
+	}
+
 	/// One of two functions allowed to run while in a dialog...
 	pub fn on_enter(&mut self) {
 		if self.delete_dialog_state.is_showing_dd {
@@ -620,19 +639,14 @@ impl App {
 	#[allow(unused_variables)]
 	pub fn skip_word_backspace(&mut self) {
 		if let WidgetPosition::ProcessSearch = self.current_widget_selected {
-			if self.process_search_state.search_state.is_enabled {
-			}
+			if self.process_search_state.search_state.is_enabled {}
 		}
 	}
 
 	pub fn clear_search(&mut self) {
 		if let WidgetPosition::ProcessSearch = self.current_widget_selected {
-			self.process_search_state.search_state.grapheme_cursor =
-				GraphemeCursor::new(0, 0, true);
-			self.process_search_state.search_state.current_search_query = String::default();
-			self.process_search_state.search_state.is_blank_search = true;
-			self.process_search_state.search_state.is_invalid_search = false;
 			self.update_process_gui = true;
+			self.process_search_state.search_state = AppSearchState::reset();
 		}
 	}
 
@@ -663,7 +677,8 @@ impl App {
 			if self.process_search_state.search_state.is_enabled && self.get_cursor_position() > 0 {
 				self.search_walk_back(self.get_cursor_position());
 
-				self.process_search_state
+				let removed_char = self
+					.process_search_state
 					.search_state
 					.current_search_query
 					.remove(self.get_cursor_position());
@@ -677,6 +692,10 @@ impl App {
 					true,
 				);
 
+				self.process_search_state.search_state.char_cursor_position -=
+					UnicodeWidthChar::width(removed_char).unwrap_or(0);
+				self.process_search_state.search_state.cursor_direction = CursorDirection::LEFT;
+
 				self.update_regex();
 				self.update_process_gui = true;
 			}
@@ -710,7 +729,15 @@ impl App {
 	pub fn on_left_key(&mut self) {
 		if !self.is_in_dialog() {
 			if let WidgetPosition::ProcessSearch = self.current_widget_selected {
+				let prev_cursor = self.get_cursor_position();
 				self.search_walk_back(self.get_cursor_position());
+				if self.get_cursor_position() < prev_cursor {
+					let str_slice = &self.process_search_state.search_state.current_search_query
+						[self.get_cursor_position()..prev_cursor];
+					self.process_search_state.search_state.char_cursor_position -=
+						UnicodeWidthStr::width(str_slice);
+					self.process_search_state.search_state.cursor_direction = CursorDirection::LEFT;
+				}
 			}
 		} else if self.delete_dialog_state.is_showing_dd && !self.delete_dialog_state.is_on_yes {
 			self.delete_dialog_state.is_on_yes = true;
@@ -720,7 +747,16 @@ impl App {
 	pub fn on_right_key(&mut self) {
 		if !self.is_in_dialog() {
 			if let WidgetPosition::ProcessSearch = self.current_widget_selected {
+				let prev_cursor = self.get_cursor_position();
 				self.search_walk_forward(self.get_cursor_position());
+				if self.get_cursor_position() > prev_cursor {
+					let str_slice = &self.process_search_state.search_state.current_search_query
+						[prev_cursor..self.get_cursor_position()];
+					self.process_search_state.search_state.char_cursor_position +=
+						UnicodeWidthStr::width(str_slice);
+					self.process_search_state.search_state.cursor_direction =
+						CursorDirection::RIGHT;
+				}
 			}
 		} else if self.delete_dialog_state.is_showing_dd && self.delete_dialog_state.is_on_yes {
 			self.delete_dialog_state.is_on_yes = false;
@@ -738,6 +774,8 @@ impl App {
 						.len(),
 					true,
 				);
+				self.process_search_state.search_state.char_cursor_position = 0;
+				self.process_search_state.search_state.cursor_direction = CursorDirection::LEFT;
 			}
 		}
 	}
@@ -756,6 +794,14 @@ impl App {
 						.len(),
 					true,
 				);
+				self.process_search_state.search_state.char_cursor_position =
+					UnicodeWidthStr::width(
+						self.process_search_state
+							.search_state
+							.current_search_query
+							.as_str(),
+					);
+				self.process_search_state.search_state.cursor_direction = CursorDirection::RIGHT;
 			}
 		}
 	}
@@ -840,6 +886,10 @@ impl App {
 						true,
 					);
 					self.search_walk_forward(self.get_cursor_position());
+
+					self.process_search_state.search_state.char_cursor_position +=
+						UnicodeWidthChar::width(caught_char).unwrap_or(0);
+
 					self.update_regex();
 					self.update_process_gui = true;
 				}
@@ -982,7 +1032,7 @@ impl App {
 	pub fn kill_highlighted_process(&mut self) -> Result<()> {
 		// Technically unnecessary but this is a good check...
 		if let WidgetPosition::Process = self.current_widget_selected {
-			if let Some(current_selected_processes) = &(self.to_delete_process_list) {
+			if let Some(current_selected_processes) = &self.to_delete_process_list {
 				for pid in &current_selected_processes.1 {
 					process_killer::kill_process_given_pid(*pid)?;
 				}

src/app/data_farmer.rs

@@ -1,4 +1,3 @@
-use crate::data_harvester::{cpu, disks, mem, network, processes, temperature, Data};
 /// In charge of cleaning, processing, and managing data.  I couldn't think of
 /// a better name for the file.  Since I called data collection "harvesting",
 /// then this is the farmer I guess.
@@ -16,6 +15,8 @@ use crate::data_harvester::{cpu, disks, mem, network, processes, temperature, Da
 use std::time::Instant;
 use std::vec::Vec;
 
+use crate::data_harvester::{cpu, disks, mem, network, processes, temperature, Data};
+
 pub type TimeOffset = f64;
 pub type Value = f64;
 pub type JoinedDataPoints = (Value, Vec<(TimeOffset, Value)>);

src/app/data_harvester.rs

@@ -1,6 +1,7 @@
 //! This is the main file to house data collection functions.
 
 use std::{collections::HashMap, time::Instant};
+
 use sysinfo::{System, SystemExt};
 
 pub mod cpu;

src/app/data_harvester/network.rs

@@ -1,7 +1,8 @@
+use std::time::Instant;
+
 use futures::StreamExt;
 use heim::net;
 use heim::units::information::byte;
-use std::time::Instant;
 use sysinfo::{NetworkExt, System, SystemExt};
 
 #[derive(Default, Clone, Debug)]

src/app/data_harvester/processes.rs

@@ -1,10 +1,13 @@
-use crate::utils::error;
 use std::{
 	collections::{hash_map::RandomState, HashMap},
 	process::Command,
 	time::Instant,
 };
+
 use sysinfo::{ProcessExt, ProcessorExt, System, SystemExt};
+
+use crate::utils::error;
+
 #[derive(Clone)]
 pub enum ProcessSorting {
 	CPU,

src/app/data_harvester/temperature.rs

@@ -1,6 +1,7 @@
+use std::cmp::Ordering;
+
 use futures::StreamExt;
 use heim::units::thermodynamic_temperature;
-use std::cmp::Ordering;
 use sysinfo::{ComponentExt, System, SystemExt};
 
 #[derive(Default, Debug, Clone)]

src/app/process_killer.rs

@@ -1,5 +1,3 @@
-/// This file is meant to house (OS specific) implementations on how to kill processes.
-use crate::utils::error::BottomError;
 use std::process::Command;
 
 // Copied from SO: https://stackoverflow.com/a/55231715
@@ -12,6 +10,9 @@ use winapi::{
 	},
 };
 
+/// This file is meant to house (OS specific) implementations on how to kill processes.
+use crate::utils::error::BottomError;
+
 #[cfg(target_os = "windows")]
 struct Process(HANDLE);
 

src/canvas.rs

@@ -1,11 +1,6 @@
-use crate::{
-	app::{self, data_harvester::processes::ProcessHarvest, WidgetPosition},
-	constants::*,
-	data_conversion::{ConvertedCpuData, ConvertedProcessData},
-	utils::error,
-};
-use std::cmp::{max, min};
+use std::cmp::max;
 use std::collections::HashMap;
+
 use tui::{
 	backend,
 	layout::{Alignment, Constraint, Direction, Layout, Rect},
@@ -17,12 +12,19 @@ use tui::{
 use unicode_segmentation::UnicodeSegmentation;
 use unicode_width::UnicodeWidthStr;
 
-mod canvas_colours;
 use canvas_colours::*;
-
-mod drawing_utils;
 use drawing_utils::*;
 
+use crate::{
+	app::{self, data_harvester::processes::ProcessHarvest, WidgetPosition},
+	constants::*,
+	data_conversion::{ConvertedCpuData, ConvertedProcessData},
+	utils::error,
+};
+
+mod canvas_colours;
+mod drawing_utils;
+
 // Headers
 const CPU_LEGEND_HEADER: [&str; 2] = ["CPU", "Use%"];
 const CPU_SELECT_LEGEND_HEADER: [&str; 2] = ["CPU", "Show (Space)"];
@@ -620,12 +622,12 @@ impl Painter {
 	fn draw_cpu_legend<B: backend::Backend>(
 		&self, f: &mut Frame<'_, B>, app_state: &mut app::App, draw_loc: Rect,
 	) {
-		let cpu_data: &[ConvertedCpuData] = &(app_state.canvas_data.cpu_data);
+		let cpu_data: &[ConvertedCpuData] = &app_state.canvas_data.cpu_data;
 
 		let num_rows = max(0, i64::from(draw_loc.height) - 5) as u64;
 		let start_position = get_start_position(
 			num_rows,
-			&(app_state.app_scroll_positions.scroll_direction),
+			&app_state.app_scroll_positions.scroll_direction,
 			&mut app_state
 				.app_scroll_positions
 				.cpu_scroll_state
@@ -766,8 +768,8 @@ impl Painter {
 	fn draw_memory_graph<B: backend::Backend>(
 		&self, f: &mut Frame<'_, B>, app_state: &app::App, draw_loc: Rect,
 	) {
-		let mem_data: &[(f64, f64)] = &(app_state.canvas_data.mem_data);
-		let swap_data: &[(f64, f64)] = &(app_state.canvas_data.swap_data);
+		let mem_data: &[(f64, f64)] = &app_state.canvas_data.mem_data;
+		let swap_data: &[(f64, f64)] = &app_state.canvas_data.swap_data;
 
 		let x_axis: Axis<'_, String> = Axis::default().bounds([0.0, TIME_STARTS_FROM as f64]);
 
@@ -839,8 +841,8 @@ impl Painter {
 	fn draw_network_graph<B: backend::Backend>(
 		&self, f: &mut Frame<'_, B>, app_state: &app::App, draw_loc: Rect,
 	) {
-		let network_data_rx: &[(f64, f64)] = &(app_state.canvas_data.network_data_rx);
-		let network_data_tx: &[(f64, f64)] = &(app_state.canvas_data.network_data_tx);
+		let network_data_rx: &[(f64, f64)] = &app_state.canvas_data.network_data_rx;
+		let network_data_tx: &[(f64, f64)] = &app_state.canvas_data.network_data_tx;
 
 		let x_axis: Axis<'_, String> = Axis::default().bounds([0.0, 60_000.0]);
 		let y_axis: Axis<'_, &str> = Axis::default()
@@ -938,7 +940,7 @@ impl Painter {
 
 		// Calculate widths
 		let width_ratios: Vec<f64> = vec![0.25, 0.25, 0.25, 0.25];
-		let lens: &Vec<usize> = &NETWORK_HEADERS_LENS;
+		let lens: &[usize] = &NETWORK_HEADERS_LENS;
 		let width = f64::from(draw_loc.width);
 
 		let variable_intrinsic_results =
@@ -967,12 +969,12 @@ impl Painter {
 	fn draw_temp_table<B: backend::Backend>(
 		&self, f: &mut Frame<'_, B>, app_state: &mut app::App, draw_loc: Rect,
 	) {
-		let temp_sensor_data: &[Vec<String>] = &(app_state.canvas_data.temp_sensor_data);
+		let temp_sensor_data: &[Vec<String>] = &app_state.canvas_data.temp_sensor_data;
 
 		let num_rows = max(0, i64::from(draw_loc.height) - 5) as u64;
 		let start_position = get_start_position(
 			num_rows,
-			&(app_state.app_scroll_positions.scroll_direction),
+			&app_state.app_scroll_positions.scroll_direction,
 			&mut app_state
 				.app_scroll_positions
 				.temp_scroll_state
@@ -984,7 +986,7 @@ impl Painter {
 			app_state.is_resized,
 		);
 
-		let sliced_vec = &(temp_sensor_data[start_position as usize..]);
+		let sliced_vec = &temp_sensor_data[start_position as usize..];
 		let mut temp_row_counter: i64 = 0;
 
 		let temperature_rows = sliced_vec.iter().map(|temp_row| {
@@ -1064,11 +1066,11 @@ impl Painter {
 	fn draw_disk_table<B: backend::Backend>(
 		&self, f: &mut Frame<'_, B>, app_state: &mut app::App, draw_loc: Rect,
 	) {
-		let disk_data: &[Vec<String>] = &(app_state.canvas_data.disk_data);
+		let disk_data: &[Vec<String>] = &app_state.canvas_data.disk_data;
 		let num_rows = max(0, i64::from(draw_loc.height) - 5) as u64;
 		let start_position = get_start_position(
 			num_rows,
-			&(app_state.app_scroll_positions.scroll_direction),
+			&app_state.app_scroll_positions.scroll_direction,
 			&mut app_state
 				.app_scroll_positions
 				.disk_scroll_state
@@ -1162,27 +1164,27 @@ impl Painter {
 		&self, f: &mut Frame<'_, B>, app_state: &mut app::App, draw_loc: Rect,
 	) {
 		let width = max(0, draw_loc.width as i64 - 34) as u64; // TODO: [REFACTOR] Hard coding this is terrible.
-		let query = app_state.get_current_search_query().as_str();
-		let grapheme_indices = UnicodeSegmentation::grapheme_indices(query, true).rev(); // Reverse due to us wanting to draw from back -> front
 		let cursor_position = app_state.get_cursor_position();
-		let right_border = min(UnicodeWidthStr::width(query), width as usize);
+		let char_cursor_position = app_state.get_char_cursor_position();
 
-		let mut itx = 0;
-		let mut query_with_cursor: Vec<Text<'_>> = if let app::WidgetPosition::ProcessSearch =
-			app_state.current_widget_selected
-		{
-			let mut res = Vec::new();
-			if cursor_position >= query.len() {
-				res.push(Text::styled(
-					" ",
-					self.colours.currently_selected_text_style,
-				))
-			}
+		let start_position: usize = get_search_start_position(
+			width as usize,
+			&app_state.process_search_state.search_state.cursor_direction,
+			&mut app_state.process_search_state.search_state.cursor_bar,
+			char_cursor_position,
+			app_state.is_resized,
+		);
 
-			res.extend(
-				grapheme_indices
+		let query = app_state.get_current_search_query().as_str();
+		let grapheme_indices = UnicodeSegmentation::grapheme_indices(query, true);
+		let mut current_grapheme_posn = 0;
+		let query_with_cursor: Vec<Text<'_>> =
+			if let app::WidgetPosition::ProcessSearch = app_state.current_widget_selected {
+				let mut res = grapheme_indices
 					.filter_map(|grapheme| {
-						if itx >= right_border {
+						current_grapheme_posn += UnicodeWidthStr::width(grapheme.1);
+
+						if current_grapheme_posn <= start_position {
 							None
 						} else {
 							let styled = if grapheme.0 == cursor_position {
@@ -1190,32 +1192,34 @@ impl Painter {
 							} else {
 								Text::styled(grapheme.1, self.colours.text_style)
 							};
-							itx += UnicodeWidthStr::width(grapheme.1);
 							Some(styled)
 						}
 					})
-					.collect::<Vec<_>>(),
-			);
+					.collect::<Vec<_>>();
 
-			res
-		} else {
-			// This is easier - we just need to get a range of graphemes, rather than
-			// dealing with possibly inserting a cursor (as none is shown!)
-			grapheme_indices
-				.filter_map(|grapheme| {
-					if itx >= right_border {
-						None
-					} else {
-						let styled = Text::styled(grapheme.1, self.colours.text_style);
-						itx += UnicodeWidthStr::width(grapheme.1);
-						Some(styled)
-					}
-				})
-				.collect::<Vec<_>>()
-		};
+				if cursor_position >= query.len() {
+					res.push(Text::styled(
+						" ",
+						self.colours.currently_selected_text_style,
+					))
+				}
 
-		// I feel like this is most definitely not the efficient way of doing this but eh
-		query_with_cursor.reverse();
+				res
+			} else {
+				// This is easier - we just need to get a range of graphemes, rather than
+				// dealing with possibly inserting a cursor (as none is shown!)
+				grapheme_indices
+					.filter_map(|grapheme| {
+						current_grapheme_posn += UnicodeWidthStr::width(grapheme.1);
+						if current_grapheme_posn <= start_position {
+							None
+						} else {
+							let styled = Text::styled(grapheme.1, self.colours.text_style);
+							Some(styled)
+						}
+					})
+					.collect::<Vec<_>>()
+			};
 
 		let mut search_text = vec![if app_state.is_grouped() {
 			Text::styled("Search by Name: ", self.colours.table_header_style)
@@ -1348,7 +1352,7 @@ impl Painter {
 
 		let position = get_start_position(
 			num_rows,
-			&(app_state.app_scroll_positions.scroll_direction),
+			&app_state.app_scroll_positions.scroll_direction,
 			&mut app_state
 				.app_scroll_positions
 				.process_scroll_state
@@ -1367,7 +1371,7 @@ impl Painter {
 			position
 		};
 
-		let sliced_vec = &(process_data[start_position as usize..]);
+		let sliced_vec = &process_data[start_position as usize..];
 		let mut process_counter: i64 = 0;
 
 		// Draw!

src/canvas/canvas_colours.rs

@@ -1,9 +1,11 @@
-mod colour_utils;
-use colour_utils::*;
 use tui::style::{Color, Modifier, Style};
 
+use colour_utils::*;
+
 use crate::{constants::*, utils::error};
 
+mod colour_utils;
+
 pub struct CanvasColours {
 	pub currently_selected_text_colour: Color,
 	pub currently_selected_bg_colour: Color,

src/canvas/canvas_colours/colour_utils.rs

@@ -1,7 +1,9 @@
-use crate::utils::{error, gen_util::*};
 use std::collections::HashMap;
+
 use tui::style::{Color, Style};
 
+use crate::utils::{error, gen_util::*};
+
 const GOLDEN_RATIO: f32 = 0.618_034; // Approx, good enough for use (also Clippy gets mad if it's too long)
 pub const STANDARD_FIRST_COLOUR: Color = Color::LightMagenta;
 pub const STANDARD_SECOND_COLOUR: Color = Color::LightYellow;

src/canvas/drawing_utils.rs

@@ -72,11 +72,43 @@ pub fn get_variable_intrinsic_widths(
 
 #[allow(dead_code, unused_variables)]
 pub fn get_search_start_position(
-	num_rows: u64, scroll_direction: &app::ScrollDirection, scroll_position_bar: &mut u64,
-	currently_selected_position: u64, is_resized: bool,
-) -> u64 {
-	//TODO: [Scroll] Gotta fix this too lol
-	0
+	num_columns: usize, cursor_direction: &app::CursorDirection, cursor_bar: &mut usize,
+	current_cursor_position: usize, is_resized: bool,
+) -> usize {
+	if is_resized {
+		*cursor_bar = 0;
+	}
+
+	match cursor_direction {
+		app::CursorDirection::RIGHT => {
+			if current_cursor_position < *cursor_bar + num_columns {
+				// If, using previous_scrolled_position, we can see the element
+				// (so within that and + num_rows) just reuse the current previously scrolled position
+				*cursor_bar
+			} else if current_cursor_position >= num_columns {
+				// Else if the current position past the last element visible in the list, omit
+				// until we can see that element
+				*cursor_bar = current_cursor_position - num_columns;
+				*cursor_bar
+			} else {
+				// Else, if it is not past the last element visible, do not omit anything
+				0
+			}
+		}
+		app::CursorDirection::LEFT => {
+			if current_cursor_position <= *cursor_bar {
+				// If it's past the first element, then show from that element downwards
+				*cursor_bar = current_cursor_position;
+				*cursor_bar
+			} else if current_cursor_position >= *cursor_bar + num_columns {
+				*cursor_bar = current_cursor_position - num_columns;
+				*cursor_bar
+			} else {
+				// Else, don't change what our start position is from whatever it is set to!
+				*cursor_bar
+			}
+		}
+	}
 }
 
 pub fn get_start_position(

src/data_conversion.rs

@@ -1,6 +1,10 @@
 //! This mainly concerns converting collected data into things that the canvas
 //! can actually handle.
 
+use std::collections::HashMap;
+
+use constants::*;
+
 use crate::{
 	app::{
 		data_farmer,
@@ -10,8 +14,6 @@ use crate::{
 	constants,
 	utils::gen_util::{get_exact_byte_values, get_simple_byte_values},
 };
-use constants::*;
-use std::collections::HashMap;
 
 #[derive(Default, Debug)]
 pub struct ConvertedNetworkData {

src/main.rs

@@ -1,15 +1,22 @@
 #![warn(rust_2018_idioms)]
 
-#[macro_use]
-extern crate log;
 #[macro_use]
 extern crate clap;
 #[macro_use]
+extern crate futures;
+#[macro_use]
 extern crate lazy_static;
 #[macro_use]
-extern crate futures;
+extern crate log;
 
-use serde::Deserialize;
+use std::{
+	boxed::Box,
+	io::{stdout, Write},
+	panic::{self, PanicInfo},
+	sync::mpsc,
+	thread,
+	time::{Duration, Instant},
+};
 
 use crossterm::{
 	event::{
@@ -20,17 +27,17 @@ use crossterm::{
 	style::Print,
 	terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
 };
-
-use std::{
-	boxed::Box,
-	io::{stdout, Write},
-	panic::{self, PanicInfo},
-	sync::mpsc,
-	thread,
-	time::{Duration, Instant},
-};
+use serde::Deserialize;
 use tui::{backend::CrosstermBackend, Terminal};
 
+use app::{
+	data_harvester::{self, processes::ProcessSorting},
+	App,
+};
+use constants::*;
+use data_conversion::*;
+use utils::error::{self, BottomError};
+
 pub mod app;
 mod utils {
 	pub mod error;
@@ -41,14 +48,6 @@ mod canvas;
 mod constants;
 mod data_conversion;
 
-use app::{
-	data_harvester::{self, processes::ProcessSorting},
-	App,
-};
-use constants::*;
-use data_conversion::*;
-use utils::error::{self, BottomError};
-
 enum Event<I, J> {
 	KeyInput(I),
 	MouseInput(J),
@@ -398,6 +397,8 @@ fn handle_key_event_or_break(
 				KeyCode::Char('u') => app.clear_search(),
 				KeyCode::Char('a') => app.skip_cursor_beginning(),
 				KeyCode::Char('e') => app.skip_cursor_end(),
+				// Can't do now, CTRL+BACKSPACE doesn't work and graphemes
+				// are hard to iter while truncating last (eloquently).
 				// KeyCode::Backspace => app.skip_word_backspace(),
 				_ => {}
 			}
@@ -496,22 +497,22 @@ fn get_temperature_option(
 	} else if let Some(flags) = &config.flags {
 		if let Some(temp_type) = &flags.temperature_type {
 			// Give lowest priority to config.
-			match temp_type.as_str() {
+			return match temp_type.as_str() {
 				"fahrenheit" | "f" => {
-					return Ok(data_harvester::temperature::TemperatureType::Fahrenheit);
+					Ok(data_harvester::temperature::TemperatureType::Fahrenheit)
 				}
 				"kelvin" | "k" => {
-					return Ok(data_harvester::temperature::TemperatureType::Kelvin);
+					Ok(data_harvester::temperature::TemperatureType::Kelvin)
 				}
 				"celsius" | "c" => {
-					return Ok(data_harvester::temperature::TemperatureType::Celsius);
+					Ok(data_harvester::temperature::TemperatureType::Celsius)
 				}
 				_ => {
-					return Err(BottomError::ConfigError(
+					Err(BottomError::ConfigError(
 						"Invalid temperature type.  Please have the value be of the form \
 						 <kelvin|k|celsius|c|fahrenheit|f>"
 							.to_string(),
-					));
+					))
 				}
 			}
 		}
@@ -717,7 +718,7 @@ fn generate_config_colours(config: &Config, painter: &mut canvas::Painter) -> er
 			painter.colours.set_avg_cpu_colour(avg_cpu_color)?;
 		}
 
-		if let Some(cpu_core_colors) = &(colours.cpu_core_colors) {
+		if let Some(cpu_core_colors) = &colours.cpu_core_colors {
 			painter.colours.set_cpu_colours(cpu_core_colors)?;
 		}
 

tests/arg_rate_tests.rs

@@ -1,6 +1,7 @@
+use std::process::Command;
+
 use assert_cmd::prelude::*;
 use predicates::prelude::*;
-use std::process::Command;
 
 // These tests are mostly here just to ensure that invalid results will be caught when passing arguments...