rm-lisa 0.3.2

//! Receive input from a tty attached to STDIN.
//!
//! Basically allow a user to just type into their terminal, and not have to do
//! anything else.

mod os_specific_apis;
mod read_provider;
pub mod replacement;
mod state;

use crate::{
	app_name_to_prefix,
	errors::LisaError,
	input::{
		InputProvider, TerminalInputEvent,
		autocomplete::AutocompleteProvider,
		history::HistoryProvider,
		stdin::{
			os_specific_apis::{
				CachedModeType, default_cached_mode, disable_raw_mode, enable_raw_mode,
				os_pre_reqs, raise_sigint,
			},
			read_provider::ReadProvider,
			replacement::parse_character_replacements,
			state::{StdinInputState, transaction::InputStateTransaction},
		},
	},
};
use arboard::Clipboard;
use fnv::FnvHashMap;
use parking_lot::Mutex;
#[cfg(test)]
use std::collections::VecDeque;
use std::{
	env::var as env_var,
	hash::BuildHasherDefault,
	io::Stdin,
	sync::{
		OnceLock,
		atomic::{AtomicBool, Ordering},
	},
};

/// A function to determine if we should insert a newline instead of sending a
/// message.
type NewlineHookFn = dyn Fn(&str) -> bool + Send + Sync;

/// A global clipboard lock.
///
/// Clipboards can't always be accessed by multiple places at once, in fact
/// usually only one thread at a time. Properly abstracting away all clipboards
/// and not just accessing them with a lock would add so so so so so much
/// complexity that this is by far the easier option.
static CLIPBOARD_LOCK: OnceLock<Mutex<()>> = OnceLock::new();

/// Test functionality for overriding the clipboard without modifying it.
#[cfg(test)]
static TEST_OVERRIDE_CLIPBOARD: OnceLock<Mutex<VecDeque<String>>> = OnceLock::new();

/// An input provider which reads input from 'STDIN', or standard in.
pub struct StdinInputProvider<ReadTy: ReadProvider> {
	/// Allow showing, and hiding the terminal input.
	active: AtomicBool,
	/// The current autocomplete provider if one exists.
	autocomplete_provider: Option<Box<dyn AutocompleteProvider>>,
	/// The cached
	cached_mode: CachedModeType,
	/// The currently active input that users are typing.
	current_input: StdinInputState,
	/// Any completed inputs since last checked.
	completed_inputs: Vec<String>,
	/// Something that can provide us a history of commands.
	history_provider: Option<Box<dyn HistoryProvider>>,
	/// If 'raw mode' has been enabled on our terminal.
	in_raw_mode: AtomicBool,
	/// Whether or not we should actually process a newline as a newline.
	newline_hook: Option<Box<NewlineHookFn>>,
	/// The provider of the read function.
	read_provider: ReadTy,
	/// The replacements as specified by the environment.
	replacements: FnvHashMap<char, Option<char>>,
}

impl StdinInputProvider<Stdin> {
	/// Create a new standard input provider.
	///
	/// ## Errors
	///
	/// Will error if the user has specified remappings that can't happen (as
	/// determined by the environment variable `${APP_NAME}_STTY_REPLACEMENTS`).
	///
	/// Additionally only error on Windows OS machines, when we fail to load in
	/// the library for `ReadConsoleEx` and various other functions that are
	/// necessary.
	///
	/// These should always be present in the kernel library.
	pub fn new(app_name: &'static str) -> Result<Self, LisaError> {
		os_pre_reqs()?;

		let environment_prefix = app_name_to_prefix(app_name);
		let replacements =
			if let Ok(env_var_value) = env_var(format!("{environment_prefix}_STTY_REPLACEMENTS")) {
				parse_character_replacements(&env_var_value)?
			} else {
				FnvHashMap::with_capacity_and_hasher(0, BuildHasherDefault::default())
			};

		Ok(Self {
			active: AtomicBool::new(false),
			autocomplete_provider: None,
			cached_mode: default_cached_mode(),
			current_input: StdinInputState::new(),
			completed_inputs: Vec::with_capacity(1),
			history_provider: None,
			in_raw_mode: AtomicBool::new(false),
			newline_hook: None,
			read_provider: std::io::stdin(),
			replacements,
		})
	}
}

impl<ReadTy: ReadProvider> StdinInputProvider<ReadTy> {
	/// Create a new STDIN Input provider given an explicit read provider.
	///
	/// ## Errors
	///
	/// Will error if the user has specified remappings that can't happen (as
	/// determined by the environment variable `${APP_NAME}_STTY_REPLACEMENTS`).
	///
	/// Additionally only error on Windows OS machines, when we fail to load in
	/// the library for `ReadConsoleEx` and various other functions that are
	/// necessary.
	///
	/// These should always be present in the kernel library.
	pub fn new_with_provider(app_name: &'static str, provider: ReadTy) -> Result<Self, LisaError> {
		os_pre_reqs()?;

		let environment_prefix = app_name_to_prefix(app_name);
		let replacements =
			if let Ok(env_var_value) = env_var(format!("{environment_prefix}_STTY_REPLACEMENTS")) {
				parse_character_replacements(&env_var_value)?
			} else {
				FnvHashMap::with_capacity_and_hasher(0, BuildHasherDefault::default())
			};

		Ok(Self {
			active: AtomicBool::new(false),
			autocomplete_provider: None,
			cached_mode: default_cached_mode(),
			current_input: StdinInputState::new(),
			completed_inputs: Vec::with_capacity(1),
			history_provider: None,
			in_raw_mode: AtomicBool::new(false),
			newline_hook: None,
			read_provider: provider,
			replacements,
		})
	}

	/// Manually poll the STDIN input without anything else.
	///
	/// ***NOTE: THIS WILL CONSUME THE INPUT AND WILL NOT PASS IT ON TO THE
	/// NORMAL HANDLING ROUTINES. IT WOULD BE YOUR JOB TO HANDLE THIS INPUT.***
	///
	/// ## Errors
	///
	/// If there is an OS error reading from standard in.
	pub fn manually_poll_input_and_consume(&self) -> Result<String, LisaError> {
		self.read_provider.non_blocking_read().map(|string| {
			string
				.chars()
				.filter_map(|character| {
					if let Some(replacement) = self.replacements.get(&character) {
						*replacement
					} else {
						Some(character)
					}
				})
				.collect::<String>()
		})
	}

	/// Set the newline hook.
	///
	/// A newline hook tells us if we should actually 'complete' the input. If
	/// this function returns true the newline is assumed to be marked as
	/// 'completed', if false input is still continuing.
	pub fn set_newline_hook(&mut self, hook: Box<dyn Fn(&str) -> bool + Send + Sync>) {
		_ = self.newline_hook.insert(hook);
	}

	/// Process the input stream, and turn them into terminal events.
	///
	/// This inputs will attempt to optimize inputs constantly cancelling, and
	/// then starting over and over again. By collapsing all cancel/start events
	/// to the begin.
	fn process_inputs(&mut self, item: &str, ansi_supported: bool) -> Vec<TerminalInputEvent> {
		// Gets appended to everytime an input is cancelled/started/finished.
		let mut input_events = Vec::with_capacity(0);
		// Prevent current input from being locked too long...
		let had_started = self.current_input.started();
		let append_ledger = self.calculate_append_ledger(&mut input_events, item, ansi_supported);

		let item_events = if let Some(ledger) = append_ledger {
			if ledger.is_empty() {
				Vec::with_capacity(0)
			} else if ledger.len() == 1
				&& let Some(char) = ledger.chars().next()
			{
				vec![TerminalInputEvent::InputAppend(char)]
			} else if !ledger.is_empty() {
				vec![TerminalInputEvent::InputMassAppend(ledger)]
			} else {
				Vec::with_capacity(0)
			}
		} else if !input_events.last().is_some_and(|ie| {
			matches!(
				ie,
				TerminalInputEvent::CursorMoveLeft(_) | TerminalInputEvent::CursorMoveRight(_)
			)
		}) {
			input_events.truncate(0);
			if had_started {
				vec![TerminalInputEvent::InputChanged(
					self.current_input.cursor_position(),
				)]
			} else {
				vec![
					TerminalInputEvent::InputStarted,
					TerminalInputEvent::InputChanged(self.current_input.cursor_position()),
				]
			}
		} else {
			// We started, we can just safely append...
			let buffer = self.current_input();
			if buffer.is_empty() {
				Vec::with_capacity(0)
			} else {
				input_events.truncate(0);
				if had_started {
					vec![TerminalInputEvent::InputChanged(
						self.current_input.cursor_position(),
					)]
				} else {
					vec![
						TerminalInputEvent::InputStarted,
						TerminalInputEvent::InputChanged(self.current_input.cursor_position()),
					]
				}
			}
		};
		input_events.extend(item_events);
		input_events
	}

	/// Process all the characters in a string, and produce an 'append' buffer.
	///
	/// This append buffer is empty if the input changed, or present with some data
	/// (potentially empty data).
	fn calculate_append_ledger(
		&mut self,
		input_events: &mut Vec<TerminalInputEvent>,
		item: &str,
		ansi_supported: bool,
	) -> Option<String> {
		let mut processing = self.current_input.process();

		let mut processed_amount = 0_usize;
		for character in item.chars() {
			processed_amount += 1;
			if Self::route_character(
				self.autocomplete_provider.as_deref(),
				self.history_provider.as_deref(),
				self.newline_hook.as_deref(),
				ansi_supported,
				character,
				&mut processing,
			) {
				// we're going down it's fine to drop.
				std::mem::drop(processing);
				self.raise_sigint();
				return None;
			}

			if let Some((move_left, move_amount, buffer, original_position)) = processing
				.did_trigger_multibyte_cursor(
					self.autocomplete_provider.as_deref(),
					self.history_provider.as_deref(),
					ansi_supported,
				) {
				if let Some(buff) = buffer {
					if buff.is_empty() {
						// do nothing!
					} else if buff.len() == 1 {
						input_events.push(TerminalInputEvent::InputAppend(
							buff.chars().next().unwrap_or_else(|| unreachable!()),
						));
					} else {
						input_events.push(TerminalInputEvent::InputMassAppend(buff));
					}
				} else if processed_amount > 0 {
					input_events.push(TerminalInputEvent::InputChanged(original_position));
				}

				if move_left {
					input_events.push(TerminalInputEvent::CursorMoveLeft(move_amount));
				} else {
					input_events.push(TerminalInputEvent::CursorMoveRight(move_amount));
				}
			}
			if processing.did_trigger_multibyte_paste()
				&& let Some(data) = Self::get_clipboard()
			{
				processing.new_string_action(&data, self.history_provider.as_deref());
			}
			if processing.did_trigger_start() {
				input_events.push(TerminalInputEvent::InputStarted);
			}
			if processing.did_trigger_cancel() {
				if input_events.last() == Some(&TerminalInputEvent::InputStarted) {
					input_events.pop();
				} else {
					input_events.push(TerminalInputEvent::InputCancelled);
				}
			}
			if processing.did_trigger_clear() {
				input_events.push(TerminalInputEvent::ClearScreen);
				// Let our displays resynchronize.
				input_events.push(TerminalInputEvent::InputChanged(
					processing.cursor_position(),
				));
			}
			if processing.did_trigger_pause() {
				input_events.push(TerminalInputEvent::ToggleOutputPause);
			}
			if let Some((append_buffer, finished)) = processing.did_trigger_finish() {
				if let Some(hprovider) = self.history_provider.as_ref() {
					hprovider.insert_command(&finished);
				}
				self.completed_inputs.push(finished);

				if let Some(append) = append_buffer {
					if append.len() == 1
						&& let Some(character) = append.chars().next()
					{
						input_events.push(TerminalInputEvent::InputAppend(character));
					} else if !append.is_empty() {
						input_events.push(TerminalInputEvent::InputMassAppend(append));
					}
				} else {
					input_events.push(TerminalInputEvent::InputChanged(
						processing.cursor_position(),
					));
				}
				input_events.push(TerminalInputEvent::InputFinished);
			}
		}

		processing.finished_processing()
	}

	/// Match a single byte character into the correct processing input state.
	///
	/// Returns if we should raise a SIGINT.
	fn route_character(
		autocomplete_provider: Option<&dyn AutocompleteProvider>,
		history_provider: Option<&dyn HistoryProvider>,
		newline_hook: Option<&NewlineHookFn>,
		ansi_supported: bool,
		character: char,
		processing: &mut InputStateTransaction<'_>,
	) -> bool {
		match character {
			// Some terminals send nul bytes while shift is being held...
			// don't pass those on.
			'\u{0}' => {}
			// Backspace character, and 'Ctrl-H'
			'\u{7f}' | '\u{8}' => processing.backspace(),
			// Ctrl-C
			'\u{3}' => {
				if !processing.cancel() {
					return true;
				}
			}
			// Ctrl-D, 'EOF'
			//
			// Normally Ctrl-D _doesn't_ raise a sigint, but in a shell
			// environment closing STDIN, closes the shell. To keep the same
			// feel we also raise SIGINT which we consider 'exit'.
			'\u{4}' => {
				return true;
			}
			// Ctrl-V
			'\u{16}' => {
				if let Some(data) = Self::get_clipboard() {
					processing.new_string_action(&data, history_provider);
				}
			}
			// Ctrl-P
			'\u{10}' => processing.previous_history_action(history_provider),
			// Ctrl-N
			'\u{e}' => processing.next_history_action(history_provider),
			// Ctrl-L
			'\u{c}' => processing.clear(),
			// Ctrl-S
			'\u{13}' => processing.pause_output(),
			// Ctrl-B
			'\u{2}' => {
				if ansi_supported {
					_ = processing.move_cursor_left(1);
				}
			}
			// Ctrl-F
			'\u{6}' => {
				if ansi_supported {
					_ = processing.move_cursor_right(1);
				}
			}
			// Ctrl-A
			'\u{1}' => {
				if ansi_supported {
					_ = processing.move_cursor_left(processing.cursor_position() + 1);
				}
			}
			// Ctrl-E
			'\u{5}' => {
				if ansi_supported {
					_ = processing.move_cursor_right(processing.current_input().len());
				}
			}
			// Ctrl-U
			'\u{15}' => {
				if ansi_supported {
					processing.uwk_cursor_to_begin();
				}
			}
			// Ctrl-K
			'\u{b}' => {
				if ansi_supported {
					processing.uwk_cursor_to_end();
				}
			}
			// Ctrl-W
			'\u{17}' => {
				if ansi_supported {
					processing.uwk_cursor_word();
				}
			}
			// Ctrl-Y
			'\u{19}' => {
				if ansi_supported {
					processing.paste_uwk();
				}
			}
			// Ctrl-T
			'\u{14}' => {
				if ansi_supported {
					processing.swap_last_two_characters();
				}
			}
			// Ctrl-G
			'\u{7}' => _ = processing.cancel(),
			// Ctrl-R
			'\u{12}' => {
				if ansi_supported {
					processing.start_history_search_action(history_provider);
				}
			}
			// Ctrl-J (also 'shift-enter' in git bash).
			//
			// If you're looking for 'enter' handling look for '\r'
			'\n' => processing.complete(),
			// Enter key is pressed.
			'\r' => {
				if let Some(hook) = newline_hook {
					if (*hook)(processing.current_input().as_ref()) {
						processing.complete();
					} else {
						processing.new_character_action('\n', history_provider);
					}
				} else {
					processing.complete();
				}
			}
			// Tab key, autocomplete, or well... tab.
			'\t' => processing.tab_action(autocomplete_provider, history_provider, true, false),
			// User actually typed something...
			_ => processing.new_character_action(character, history_provider),
		}

		false
	}

	fn get_clipboard() -> Option<String> {
		// Allow tests to override the clipboard as needed.
		#[cfg(test)]
		{
			let mut clipboard = TEST_OVERRIDE_CLIPBOARD
				.get_or_init(|| Mutex::new(VecDeque::new()))
				.lock();
			if let Some(value) = clipboard.pop_front() {
				return Some(value);
			}
		}

		let guard = CLIPBOARD_LOCK.get_or_init(|| Mutex::new(())).lock();
		// Getting clipboards may fail temporarily but be ready later.
		//
		// So we can ignore any failures as a 'temporary' issue.
		let Ok(mut clipboard) = Clipboard::new() else {
			return None;
		};
		let text = clipboard.get_text().ok();
		std::mem::drop(guard);
		text
	}

	fn enable_raw_mode(&mut self) -> Result<(), LisaError> {
		if self.in_raw_mode.swap(true, Ordering::AcqRel) {
			return Ok(());
		}

		self.cached_mode = enable_raw_mode()?;
		Ok(())
	}

	fn disable_raw_mode(&mut self) -> Result<(), LisaError> {
		if !self.in_raw_mode.swap(false, Ordering::AcqRel) {
			return Ok(());
		}

		self.cached_mode = disable_raw_mode(self.cached_mode)?;
		Ok(())
	}

	fn raise_sigint(&mut self) {
		// Sigint means termination for us always.
		//
		// Ensure raw mode is disabled.
		_ = self.disable_raw_mode();
		if let Some(hprovider) = self.history_provider.as_ref() {
			hprovider.attempt_to_do_full_sync();
		}
		raise_sigint();
	}
}

impl<ReadTy: ReadProvider> InputProvider for StdinInputProvider<ReadTy> {
	fn is_stdin(&self) -> bool {
		true
	}

	fn is_active(&self) -> bool {
		self.active.load(Ordering::Relaxed)
	}
	fn set_active(&mut self, active: bool) -> Result<(), LisaError> {
		if active {
			self.enable_raw_mode()?;
		} else {
			self.disable_raw_mode()?;
		}

		self.active.store(active, Ordering::SeqCst);
		Ok(())
	}

	fn input_in_progress(&self) -> bool {
		self.current_input.started()
	}
	fn current_input(&self) -> String {
		self.current_input.input()
	}
	fn poll_for_input(&mut self, ansi_supported: bool) -> Vec<TerminalInputEvent> {
		let read_value = self.read_provider.non_blocking_read().map(|string| {
			string
				.chars()
				.filter_map(|character| {
					if let Some(replacement) = self.replacements.get(&character) {
						*replacement
					} else {
						Some(character)
					}
				})
				.collect::<String>()
		});

		match read_value {
			Ok(item) => self.process_inputs(&item, ansi_supported),
			Err(_cause) => Vec::with_capacity(0),
		}
	}

	fn set_autocomplete_provider(&mut self, autocomplete: Box<dyn AutocompleteProvider>) {
		_ = self.autocomplete_provider.insert(autocomplete);
	}
	fn current_autocomplete_suggestion(&self) -> Option<String> {
		self.autocomplete_provider
			.as_ref()
			.and_then(|ap| ap.get_displayable_suggestion(self.current_input.input()))
	}
	fn autocomplete_suggestion_pending(&self) -> bool {
		self.current_input.autocomplete_pending()
	}

	/// Set the current history provider to show previous commands.
	fn set_history_provider(&mut self, history: Box<dyn HistoryProvider>) {
		_ = self.history_provider.insert(history);
	}
	fn current_history_search_value(&self) -> Option<String> {
		self.current_input.current_history_search_value()
	}
	fn is_doing_history_search(&self) -> bool {
		self.current_input.is_doing_history_search()
	}

	fn inputs(&mut self) -> Vec<String> {
		self.completed_inputs.drain(..).collect()
	}
}

impl<ReadTy: ReadProvider> Drop for StdinInputProvider<ReadTy> {
	fn drop(&mut self) {
		if self.in_raw_mode.load(Ordering::Relaxed) {
			_ = self.disable_raw_mode();
		}
	}
}

/// A multi-byte cursor control character.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
enum MultibyteCursorControl {
	/// A 'shift-tab' that has occured.
	ShiftTab,
	/// A user has hit 'up' on their arrow keys.
	UpArrow,
	/// A user has hit 'down' on their arrow keys.
	DownArrow,
	/// A user has hit 'left' on their arrow keys.
	LeftArrow,
	/// A user has hit 'right' on their arrow keys.
	RightArrow,
	/// A user has hit 'left' on the arrow key while holding shift.
	ShiftLeftArrow,
	/// A user has hit 'right' ont he arrow key while holding shift.
	ShiftRightArrow,
}

#[cfg(test)]
pub mod test_helpers {
	use super::*;

	/// Insert the next paste value to get read.
	pub fn insert_next_paste_value(new_value: String) {
		let mut clipboard = TEST_OVERRIDE_CLIPBOARD
			.get_or_init(|| Mutex::new(VecDeque::new()))
			.lock();
		clipboard.push_back(new_value);
	}
}

#[cfg(test)]
mod unit_tests {
	use super::{test_helpers::insert_next_paste_value, *};
	use crate::input::{
		autocomplete::test_helpers::AutocompleteSuggestionList, history::SimpleHistoryProvider,
	};
	use parking_lot::Mutex;
	use tokio::sync::mpsc::channel;

	#[test]
	pub fn always_stdin() {
		// Test with actual stdin.
		{
			let provider = StdinInputProvider::new("test")
				.expect("Failed to create new stdin input provider!");
			assert!(provider.is_stdin());
		}

		// Test with channel.
		{
			let (_sender, raw_receiver) = channel(8);
			let read_provider = Mutex::new(raw_receiver);
			let provider = StdinInputProvider::new_with_provider("test", read_provider)
				.expect("Failed to create new stdin input provider!");

			assert!(provider.is_stdin());
		}
	}

	/// Validate that manually polling for input removes any erase buffer.
	#[tokio::test]
	pub async fn manually_poll_for_input_consumes() {
		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");
		sender
			.send("abcdefghijklmnopqrstuvwxyz".to_owned())
			.await
			.expect("Failed to send example input");

		assert_eq!(
			provider
				.manually_poll_input_and_consume()
				.expect("Failed to manually poll input and consume"),
			"abcdefghijklmnopqrstuvwxyz",
		);
		assert_eq!(provider.poll_for_input(true), Vec::with_capacity(0));
		assert!(provider.manually_poll_input_and_consume().is_err());
	}

	#[tokio::test]
	pub async fn simple_type_enter_with_hooks_and_without_hooks() {
		// With ANSI support.
		{
			let (sender, raw_receiver) = channel(8);
			let read_provider = Mutex::new(raw_receiver);
			let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
				.expect("Failed to create new stdin input provider!");

			sender
				.send("abcdefghijklmnopqrstuvwxyz(\r".to_owned())
				.await
				.expect("Failed to send example input");
			assert_eq!(
				provider.poll_for_input(true),
				vec![
					TerminalInputEvent::InputStarted,
					TerminalInputEvent::InputMassAppend("abcdefghijklmnopqrstuvwxyz(".to_owned()),
					TerminalInputEvent::InputFinished,
				],
			);

			provider.set_newline_hook(Box::new(|data: &str| -> bool {
				data.chars().filter(|character| *character == '(').count()
					== data.chars().filter(|character| *character == ')').count()
			}));
			sender
				.send("abcdefghijklmnopqrstuvwxyz(\r".to_owned())
				.await
				.expect("Failed to send example input");
			assert_eq!(
				provider.poll_for_input(true),
				vec![
					TerminalInputEvent::InputStarted,
					TerminalInputEvent::InputMassAppend("abcdefghijklmnopqrstuvwxyz(\n".to_owned()),
				],
			);
			sender
				.send(")\r".to_owned())
				.await
				.expect("Failed to send example input!");
			assert_eq!(
				provider.poll_for_input(true),
				vec![
					TerminalInputEvent::InputAppend(')'),
					TerminalInputEvent::InputFinished,
				],
			);
		}

		// Without ANSI support.
		{
			let (sender, raw_receiver) = channel(8);
			let read_provider = Mutex::new(raw_receiver);
			let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
				.expect("Failed to create new stdin input provider!");

			sender
				.send("abcdefghijklmnopqrstuvwxyz(\r".to_owned())
				.await
				.expect("Failed to send example input");
			assert_eq!(
				provider.poll_for_input(false),
				vec![
					TerminalInputEvent::InputStarted,
					TerminalInputEvent::InputMassAppend("abcdefghijklmnopqrstuvwxyz(".to_owned()),
					TerminalInputEvent::InputFinished,
				],
			);

			provider.set_newline_hook(Box::new(|data: &str| -> bool {
				data.chars().filter(|character| *character == '(').count()
					== data.chars().filter(|character| *character == ')').count()
			}));
			sender
				.send("abcdefghijklmnopqrstuvwxyz(\r".to_owned())
				.await
				.expect("Failed to send example input");
			assert_eq!(
				provider.poll_for_input(false),
				vec![
					TerminalInputEvent::InputStarted,
					TerminalInputEvent::InputMassAppend("abcdefghijklmnopqrstuvwxyz(\n".to_owned()),
				],
			);
			sender
				.send(")\r".to_owned())
				.await
				.expect("Failed to send example input!");
			assert_eq!(
				provider.poll_for_input(false),
				vec![
					TerminalInputEvent::InputAppend(')'),
					TerminalInputEvent::InputFinished,
				],
			);
		}
	}

	#[tokio::test]
	pub async fn respects_replacements() {
		unsafe {
			std::env::set_var(
				"TEST_TOTALLY_UNIQUE_RESPECTS_REPLACEMENTS_STTY_REPLACEMENTS",
				"z=0xd",
			);
		}

		let mut expected_replacement_map = FnvHashMap::default();
		expected_replacement_map.insert('z', Some('\r'));
		// Validate normal constructor also respects it.
		{
			let state = StdinInputProvider::new("test-totally-unique-respects-replacements")
				.expect("Failed to create stdininputprovider");
			assert_eq!(state.replacements, expected_replacement_map);
		}
		// Validate reader constructor respects it, and validate remaps work.
		{
			let (sender, raw_receiver) = channel(8);
			let read_provider = Mutex::new(raw_receiver);
			let mut provider = StdinInputProvider::new_with_provider(
				"test-totally-unique-respects-replacements",
				read_provider,
			)
			.expect("Failed to create new stdin input provider!");

			sender
				.send("abcdefghijklmnopqrstuvwxy(z".to_owned())
				.await
				.expect("Failed to send example input");
			assert_eq!(
				provider.poll_for_input(false),
				vec![
					TerminalInputEvent::InputStarted,
					TerminalInputEvent::InputMassAppend("abcdefghijklmnopqrstuvwxy(".to_owned()),
					TerminalInputEvent::InputFinished,
				],
			);
			sender
				.send("abcdefghijklmnopqrstuvwxy(z".to_owned())
				.await
				.expect("Failed to send example input");
			assert_eq!(
				provider
					.manually_poll_input_and_consume()
					.expect("Failed to manually poll input and consume!"),
				"abcdefghijklmnopqrstuvwxy(\r".to_owned(),
			);
		}

		// Test that invalid stty replacements causes errors.
		unsafe {
			std::env::set_var(
				"TEST_TOTALLY_UNIQUE_RESPECTS_REPLACEMENTS_STTY_REPLACEMENTS",
				"undef=",
			);
		}

		assert!(
			StdinInputProvider::new("test-totally-unique-respects-replacements").is_err(),
			"Invalid STTY replacements did not error `StdinInputProvider`",
		);
		assert!(
			StdinInputProvider::new_with_provider(
				"test-totally-unique-respects-replacements",
				std::io::stdin(),
			)
			.is_err(),
			"Invalid STTY replacements did not error `StdinInputProvider`",
		);
	}

	#[tokio::test]
	pub async fn append_ledger_to_events() {
		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");

		// start the input to get ride of input started event.
		sender
			.send("a\u{7f}".to_owned())
			.await
			.expect("Failed to start input!");
		_ = provider.poll_for_input(true);
		// If append ledger exists, and is empty we get 0 events.
		sender
			.send("".to_owned())
			.await
			.expect("Failed to send input");
		assert_eq!(provider.poll_for_input(true), vec![]);
		// If append ledger is a single character, we get a single append event.
		sender
			.send("a".to_owned())
			.await
			.expect("Failed to send input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputAppend('a')]
		);
		// If append ledger is multiple characters we get a single mass append.
		sender
			.send("bcd".to_owned())
			.await
			.expect("Failed to send input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputMassAppend("bcd".to_owned())],
		);

		// Trigger change... (append buffer doesn't exist) last input isn't character move.
		sender
			.send("\u{7f}a".to_owned())
			.await
			.expect("failed to send input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(4)],
		);
		// Validate even with cursor moves in the middle, and items, still causes a
		// change.
		sender
			.send("\u{7f}abcdef\u{1b}[D\u{7f}c".to_owned())
			.await
			.expect("");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(8)],
		);
	}

	#[tokio::test]
	pub async fn cursor_operations_no_happen_when_no_ansi() {
		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");

		// first populate it with some input.
		sender
			.send("abcdefghijklmnopqrstuvwxyz".to_owned())
			.await
			.expect("Failed to send base input data");
		_ = provider.poll_for_input(false);
		sender.send(
			"\u{2}\u{2}\u{2}\u{6}\u{5}\u{1}\u{6}\u{15}\u{19}\u{17}\u{19}\u{b}\u{14}\u{12}\u{1b}[C\u{1b}[C\u{1b}[D\u{1b}[1;2C\u{1b}[1;2D".to_owned()
		).await.expect("Failed to send input data!");
		assert_eq!(provider.poll_for_input(false), Vec::with_capacity(0));
		assert_eq!(provider.current_input.cursor_position(), 26);

		sender
			.send("\u{3}".to_owned())
			.await
			.expect("Failed to send cancel!");
		_ = provider.poll_for_input(true);

		sender
			.send("abcdefghijklmnopqrstuvwxyz".to_owned())
			.await
			.expect("Failed to send base input data");
		_ = provider.poll_for_input(false);
		sender.send(
			"\u{2}\u{2}\u{2}\u{6}\u{5}\u{1}\u{6}\u{15}\u{19}\u{17}\u{19}\u{b}\u{14}\u{12}\u{1b}[C\u{1b}[C\u{1b}[D\u{1b}[1;2C\u{1b}[1;2D".to_owned()
		).await.expect("Failed to send input data!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![
				TerminalInputEvent::InputChanged(26),
				TerminalInputEvent::CursorMoveLeft(1),
				TerminalInputEvent::InputChanged(26),
				TerminalInputEvent::CursorMoveRight(1),
				TerminalInputEvent::CursorMoveLeft(26),
			],
		);
		assert_eq!(provider.current_input.cursor_position(), 0);
	}

	#[cfg(feature = "tests-with-signals")]
	#[tokio::test]
	pub async fn ctrl_c_and_ctrl_d() {
		use std::sync::{Arc, atomic::AtomicU8};
		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");

		let ctrl_c_handler = Arc::new(AtomicU8::new(0));
		let cloned_handler = ctrl_c_handler.clone();
		ctrlc::set_handler(move || {
			cloned_handler.fetch_add(1, Ordering::SeqCst);
		})
		.expect("Failed to set ctrl-c handler!");

		sender
			.send("abcdefghijklmnopqrstuvwxyz\u{3}".to_owned())
			.await
			.expect("Failed to send first input + ctrl-c");
		// Inputs should not send ctrl-c, but instead cancel.
		_ = provider.poll_for_input(true);
		assert_eq!(ctrl_c_handler.load(Ordering::SeqCst), 0);
		sender
			.send("abcdefghijklmnopqrstuvwxyz\u{3}".to_owned())
			.await
			.expect("Failed to send first input + ctrl-c");
		_ = provider.poll_for_input(false);
		assert_eq!(ctrl_c_handler.load(Ordering::SeqCst), 0);
		sender
			.send("\u{3}".to_owned())
			.await
			.expect("Failed to send second ctrl-c!");
		_ = provider.poll_for_input(true);
		sender
			.send("\u{3}".to_owned())
			.await
			.expect("Failed to send second ctrl-c!");
		_ = provider.poll_for_input(false);
		// Sleep to give other thread time to update...
		tokio::time::sleep(std::time::Duration::from_millis(300)).await;
		assert_eq!(ctrl_c_handler.load(Ordering::SeqCst), 2);

		sender
			.send("\u{4}".to_owned())
			.await
			.expect("Failed to send second ctrl-c!");
		_ = provider.poll_for_input(true);
		sender
			.send("\u{4}".to_owned())
			.await
			.expect("Failed to send second ctrl-c!");
		_ = provider.poll_for_input(false);
		// Sleep to give other thread time to update...
		tokio::time::sleep(std::time::Duration::from_millis(300)).await;
		assert_eq!(ctrl_c_handler.load(Ordering::SeqCst), 4);
	}

	#[tokio::test]
	pub async fn autocomplete() {
		let suggestion = Box::new(AutocompleteSuggestionList(vec![
			"command long".to_owned(),
			"command short".to_owned(),
			"command longer".to_owned(),
			"command shorter".to_owned(),
			"other command".to_owned(),
		]));

		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");
		provider.set_autocomplete_provider(suggestion);

		sender
			.send("command ".to_owned())
			.await
			.expect("Failed to send start of input");
		_ = provider.poll_for_input(true);
		assert!(provider.input_in_progress());
		assert!(!provider.autocomplete_suggestion_pending());
		assert_eq!(
			provider.current_autocomplete_suggestion(),
			Some("long".to_owned()),
		);

		sender
			.send("\t".to_owned())
			.await
			.expect("Failed to send tab input!");
		// Moves to end of auto complete input, past command.
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(12)],
		);
		assert!(provider.autocomplete_suggestion_pending());
		assert_eq!(provider.current_input(), "command long");

		// Moves two more, cause we changed to 'command short' over 'command long'
		sender
			.send("\t".to_owned())
			.await
			.expect("Failed to send tab input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(13)],
		);
		assert!(provider.autocomplete_suggestion_pending());
		assert_eq!(provider.current_input(), "command short");

		// Moves one more, cause we changed to 'command longer' over 'command short'
		sender
			.send("\t".to_owned())
			.await
			.expect("Failed to send tab input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(14)],
		);
		assert!(provider.autocomplete_suggestion_pending());
		assert_eq!(provider.current_input(), "command longer");

		sender
			.send("\u{1b}[Z".to_owned())
			.await
			.expect("Failed to send shift tab input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(13)],
			"Post shift tab Current input is: [{}] @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert!(provider.autocomplete_suggestion_pending());
		assert_eq!(provider.current_input(), "command short");

		sender
			.send("a".to_owned())
			.await
			.expect("Failed to send promotion input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputAppend('a')],
		);
		assert!(!provider.autocomplete_suggestion_pending());
		assert_eq!(provider.current_input(), "command shorta");

		// Cancel our current input and reset.
		sender
			.send("\u{3}".to_owned())
			.await
			.expect("Failed to send cancellation!");
		_ = provider.poll_for_input(true);

		// Start a brand new input that can be autocompleted.
		sender
			.send("command \u{1b}[D\u{1b}[D\u{1b}[D\u{1b}[D\u{1b}[D".to_owned())
			.await
			.expect("Failed to send start of input");
		_ = provider.poll_for_input(true);
		assert!(provider.input_in_progress());
		assert!(!provider.autocomplete_suggestion_pending());
		assert_eq!(
			provider.current_autocomplete_suggestion(),
			Some("long".to_owned()),
		);

		sender
			.send("\t\u{1b}[C\u{1b}[C\u{1b}[C\u{1b}[C\u{1b}[C".to_owned())
			.await
			.expect("Failed to start autocomplete input!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(12)],
			"Current input is: [{:?}] @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert!(!provider.autocomplete_suggestion_pending());
		assert_eq!(provider.current_input(), "command long".to_owned());
	}

	#[tokio::test]
	pub async fn history_non_search() {
		let history_provider = Box::new(SimpleHistoryProvider::new_in_memory(10));
		history_provider.insert_command("previous command");
		history_provider.insert_command("short");
		history_provider.insert_command("cos sdkversion");

		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");
		provider.set_history_provider(history_provider);

		// Populate with a newer command.
		sender
			.send("new command\rtest".to_owned())
			.await
			.expect("Failed to send newer command");
		_ = provider.poll_for_input(false);

		sender
			.send("\u{1b}[A".to_owned())
			.await
			.expect("Failed to send up arrow!");
		assert_eq!(
			provider.poll_for_input(false),
			vec![TerminalInputEvent::InputChanged(4)],
		);
		assert_eq!(provider.current_input(), "new command");

		sender
			.send("\u{1b}[A".to_owned())
			.await
			.expect("Failed to send up arrow!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(4)],
			"Current input is: [{:?}] @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert_eq!(provider.current_input(), "cos sdkversion");

		// Move to validate that history changing can move.
		sender
			.send("\u{1b}[C\u{1b}[C\u{1b}[C\u{1b}[C\u{1b}[C\u{1b}[C".to_owned())
			.await
			.expect("failed to send some right arrows!");
		_ = provider.poll_for_input(true);

		sender
			.send("\u{1b}[A".to_owned())
			.await
			.expect("Failed to send up arrow!");
		// This should move the cursor cause it's shorter.
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(5)],
			"Current input is: [{:?}] @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert_eq!(provider.current_input(), "short");

		sender
			.send("\u{1b}[A".to_owned())
			.await
			.expect("Failed to send up arrow!");
		// Again doesn't need to move
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(5)],
			"Current input is: [{:?}] @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert_eq!(provider.current_input(), "previous command");

		// Move the cursor so we need to move again, before going down.
		sender
			.send("\u{1b}[C\u{1b}[C\u{1b}[B".to_owned())
			.await
			.expect("Failed to send up arrow!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(5)],
			"Current input is: [{:?}] @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert_eq!(provider.current_input(), "short");

		// Restores previous input, and can move cursor.
		sender
			.send("\u{1b}[B\u{1b}[B\u{1b}[B\u{1b}[B\u{1b}[B\u{1b}[B".to_owned())
			.await
			.expect("Failed to send down arrow!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(4)],
		);
		assert_eq!(provider.current_input(), "test");
		assert_eq!(provider.current_input.cursor_position(), 4);

		// Validate can start an input too.
		sender
			.send("\u{3}".to_owned())
			.await
			.expect("Failed to send cancel input");
		_ = provider.poll_for_input(true);
		sender
			.send("\u{1b}[A".to_owned())
			.await
			.expect("Failed to send up arrow!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![
				TerminalInputEvent::InputStarted,
				TerminalInputEvent::InputChanged(11),
			],
		);
	}

	#[tokio::test]
	pub async fn history_searching() {
		let history_provider = Box::new(SimpleHistoryProvider::new_in_memory(15));
		history_provider.insert_command("word swap again");
		history_provider.insert_command("word swap more");
		history_provider.insert_command("swap word again");
		history_provider.insert_command("swap word more");
		history_provider.insert_command("comamand longer1");
		history_provider.insert_command("command long");
		history_provider.insert_command("command longer");
		history_provider.insert_command("command short");
		history_provider.insert_command("command shorter");
		history_provider.insert_command("other");

		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");
		provider.set_history_provider(history_provider);

		// Type and start history search.
		sender
			.send("command ".to_owned())
			.await
			.expect("Failed to start history search");
		assert_eq!(
			provider.poll_for_input(true),
			vec![
				TerminalInputEvent::InputStarted,
				TerminalInputEvent::InputMassAppend("command ".to_owned()),
			],
		);
		assert!(!provider.is_doing_history_search());
		assert!(provider.current_history_search_value().is_none());

		sender
			.send("\u{12}".to_owned())
			.await
			.expect("Failed to send ctrl-r to input to start history search!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(8)],
		);
		assert!(provider.is_doing_history_search());
		assert_eq!(
			provider.current_history_search_value(),
			Some("shorter".to_owned()),
		);
		// Isn't like autocomplete, actually treated as a full real value.
		assert_eq!(provider.current_input(), "command shorter");

		sender
			.send("l".to_owned())
			.await
			.expect("Failed to send key press to terminal");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputAppend('l')],
		);
		assert!(provider.is_doing_history_search());
		assert_eq!(
			provider.current_history_search_value(),
			Some("onger".to_owned()),
		);
		assert_eq!(provider.current_input(), "command longer");

		sender
			.send("\u{1b}[D\u{1b}[D\u{2}\u{2}\u{1b}[D\u{1b}[Da".to_owned())
			.await
			.expect("Failed to send cursor movement and append for history!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(4)],
			"Current Input Is ({:?}) @ {}",
			provider.current_input(),
			provider.current_input.cursor_position(),
		);
		assert!(provider.is_doing_history_search());
		assert_eq!(
			provider.current_history_search_value(),
			Some("onger1".to_owned()),
		);

		sender
			.send("\u{1b}[1;2Conger1".to_owned())
			.await
			.expect("Failed to complete history search!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(14)],
		);
		assert!(provider.is_doing_history_search());
		assert!(provider.current_history_search_value().is_none());

		sender
			.send("\u{3}".to_owned())
			.await
			.expect("Failed to send cancel!");
		_ = provider.poll_for_input(true);

		sender
			.send("word swap\u{12}".to_owned())
			.await
			.expect("Failed to send history search start!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![
				TerminalInputEvent::InputStarted,
				TerminalInputEvent::InputChanged(9),
			],
		);
		sender
			.send("\u{1b}t a".to_owned())
			.await
			.expect("Failed to swap words and type a!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputChanged(11)],
			"Current input is: [{:?}] @ {}",
			provider.current_input.input(),
			provider.current_input.cursor_position(),
		);
		assert!(provider.is_doing_history_search());
		assert_eq!(
			provider.current_history_search_value(),
			Some("gain".to_owned()),
		);
		assert_eq!(provider.current_input.input(), "swap word again");

		sender
			.send("\r".to_owned())
			.await
			.expect("Failed to send enter early!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputFinished],
		);
		assert_eq!(
			provider.completed_inputs.last().map(Clone::clone),
			Some("swap word again".to_owned())
		);

		assert!(!provider.is_doing_history_search());
		sender
			.send("command \u{12}".to_owned())
			.await
			.expect("Failed to test history search without ANSI!");
		assert_eq!(
			provider.poll_for_input(false),
			vec![
				TerminalInputEvent::InputStarted,
				TerminalInputEvent::InputMassAppend("command ".to_owned())
			],
		);
		assert!(!provider.is_doing_history_search());
	}

	#[tokio::test]
	pub async fn paste_control_codes() {
		let (sender, raw_receiver) = channel(8);
		let read_provider = Mutex::new(raw_receiver);
		let mut provider = StdinInputProvider::new_with_provider("test", read_provider)
			.expect("Failed to create new stdin input provider!");

		insert_next_paste_value("\u{1b}[31m\u{1b}[1;31min red!\u{1b}[0mjust normal!".to_owned());
		sender
			.send("\u{16}".to_owned())
			.await
			.expect("Failed to send paste!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![
				TerminalInputEvent::InputStarted,
				TerminalInputEvent::InputMassAppend(
					"\u{1b}[31m\u{1b}[1;31min red!\u{1b}[0mjust normal!".to_owned()
				),
			],
		);
		assert_eq!(provider.current_input.cursor_position(), 35);
		insert_next_paste_value("\u{16}\u{12}\u{2}\u{1b}[D\u{1b}[D\u{1b}[D".to_owned());
		sender
			.send("\u{16}".to_owned())
			.await
			.expect("Failed to send paste!");
		assert_eq!(
			provider.poll_for_input(true),
			vec![TerminalInputEvent::InputMassAppend(
				"\u{16}\u{12}\u{2}\u{1b}[D\u{1b}[D\u{1b}[D".to_owned()
			)],
		);
		assert!(!provider.current_input.is_doing_history_search());
		assert_eq!(provider.current_input.cursor_position(), 47);
	}
}