693 lines
23 KiB
Rust
693 lines
23 KiB
Rust
/*
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* meli - ui crate.
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*
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* Copyright 2017-2018 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*! The application's state.
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The UI crate has an Box<dyn Component>-Component-System design. The System part, is also the application's state, so they're both merged in the `State` struct.
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`State` owns all the Components of the UI. In the application's main event loop, input is handed to the state in the form of `UIEvent` objects which traverse the component graph. Components decide to handle each input or not.
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Input is received in the main loop from threads which listen on the stdin for user input, observe folders for file changes etc. The relevant struct is `ThreadEvent`.
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*/
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use super::*;
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use melib::backends::{FolderHash, NotifyFn};
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use crossbeam::channel::{bounded, unbounded, Receiver, Sender};
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use fnv::FnvHashMap;
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use std::env;
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use std::io::Write;
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use std::result;
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use std::thread;
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use termion::raw::IntoRawMode;
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use termion::screen::AlternateScreen;
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use termion::{clear, cursor};
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pub type StateStdout = termion::screen::AlternateScreen<termion::raw::RawTerminal<std::io::Stdout>>;
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struct InputHandler {
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rx: Receiver<InputCommand>,
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tx: Sender<InputCommand>,
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}
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impl InputHandler {
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fn restore(&self, tx: Sender<ThreadEvent>) {
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let rx = self.rx.clone();
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thread::Builder::new()
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.name("input-thread".to_string())
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.spawn(move || {
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get_events(
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|k| {
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tx.send(ThreadEvent::Input(k)).unwrap();
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},
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|i| {
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tx.send(ThreadEvent::InputRaw(i)).unwrap();
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},
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&rx,
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)
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})
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.unwrap();
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}
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fn kill(&self) {
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self.tx.send(InputCommand::Kill).unwrap();
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}
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fn switch_to_raw(&self) {
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self.tx.send(InputCommand::Raw).unwrap();
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}
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fn switch_from_raw(&self) {
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self.tx.send(InputCommand::NoRaw).unwrap();
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}
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}
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/// A context container for loaded settings, accounts, UI changes, etc.
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pub struct Context {
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pub accounts: Vec<Account>,
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pub mailbox_hashes: FnvHashMap<FolderHash, usize>,
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pub settings: Settings,
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pub runtime_settings: Settings,
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/// Areas of the screen that must be redrawn in the next render
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pub dirty_areas: VecDeque<Area>,
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/// Events queue that components send back to the state
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pub replies: VecDeque<UIEvent>,
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sender: Sender<ThreadEvent>,
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receiver: Receiver<ThreadEvent>,
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input: InputHandler,
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work_controller: WorkController,
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pub temp_files: Vec<File>,
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}
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impl Context {
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pub fn replies(&mut self) -> Vec<UIEvent> {
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self.replies.drain(0..).collect()
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}
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pub fn input_kill(&self) {
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self.input.kill();
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}
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pub fn input_from_raw(&self) {
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self.input.switch_from_raw();
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}
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pub fn input_to_raw(&self) {
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self.input.switch_to_raw();
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}
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pub fn restore_input(&self) {
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self.input.restore(self.sender.clone());
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}
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pub fn account_status(
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&mut self,
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idx_a: usize,
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folder_hash: FolderHash,
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) -> result::Result<(), usize> {
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match self.accounts[idx_a].status(folder_hash) {
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Ok(()) => {
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self.replies
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.push_back(UIEvent::MailboxUpdate((idx_a, folder_hash)));
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Ok(())
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}
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Err(n) => Err(n),
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}
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}
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pub fn work_controller(&self) -> &WorkController {
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&self.work_controller
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}
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}
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/// A State object to manage and own components and components of the UI. `State` is responsible for
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/// managing the terminal and interfacing with `melib`
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pub struct State {
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cols: usize,
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rows: usize,
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grid: CellBuffer,
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stdout: Option<StateStdout>,
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child: Option<ForkType>,
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pub mode: UIMode,
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components: Vec<Box<dyn Component>>,
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pub context: Context,
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threads: FnvHashMap<thread::ThreadId, (Sender<bool>, thread::JoinHandle<()>)>,
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}
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impl Drop for State {
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fn drop(&mut self) {
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// When done, restore the defaults to avoid messing with the terminal.
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self.switch_to_main_screen();
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}
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}
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impl Default for State {
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fn default() -> Self {
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Self::new()
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}
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}
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impl State {
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pub fn new() -> Self {
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/* Create a channel to communicate with other threads. The main process is the sole receiver.
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* */
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let (sender, receiver) = bounded(32 * ::std::mem::size_of::<ThreadEvent>());
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/*
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* Create async channel to block the input-thread if we need to fork and stop it from reading
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* stdin, see get_events() for details
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* */
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let input_thread = unbounded();
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let backends = Backends::new();
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let settings = Settings::new();
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let termsize = termion::terminal_size().ok();
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let termcols = termsize.map(|(w, _)| w);
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let termrows = termsize.map(|(_, h)| h);
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let cols = termcols.unwrap_or(0) as usize;
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let rows = termrows.unwrap_or(0) as usize;
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let work_controller = WorkController::new(sender.clone());
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let mut accounts: Vec<Account> = settings
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.accounts
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.iter()
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.enumerate()
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.map(|(index, (n, a_s))| {
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let sender = sender.clone();
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Account::new(
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index,
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n.to_string(),
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a_s.clone(),
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&backends,
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work_controller.get_context(),
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NotifyFn::new(Box::new(move |f: FolderHash| {
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sender
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.send(ThreadEvent::UIEvent(UIEvent::StartupCheck(f)))
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.unwrap();
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})),
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)
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})
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.collect();
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accounts.sort_by(|a, b| a.name().cmp(&b.name()));
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let mut s = State {
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cols,
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rows,
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grid: CellBuffer::new(cols, rows, Cell::with_char(' ')),
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stdout: None,
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child: None,
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mode: UIMode::Normal,
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components: Vec::with_capacity(1),
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context: Context {
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accounts,
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mailbox_hashes: FnvHashMap::with_capacity_and_hasher(1, Default::default()),
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settings: settings.clone(),
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runtime_settings: settings,
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dirty_areas: VecDeque::with_capacity(5),
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replies: VecDeque::with_capacity(5),
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temp_files: Vec::new(),
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work_controller,
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sender,
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receiver,
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input: InputHandler {
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rx: input_thread.1,
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tx: input_thread.0,
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},
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},
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threads: FnvHashMap::with_capacity_and_hasher(1, Default::default()),
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};
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if s.context.settings.terminal.ascii_drawing {
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s.grid.set_ascii_drawing(true);
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}
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s.switch_to_alternate_screen();
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debug!("inserting mailbox hashes:");
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{
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/* Account::watch() needs
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* - work_controller to pass `work_context` to the watcher threads and then add them
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* to the controller's static thread list,
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* - sender to pass a RefreshEventConsumer closure to watcher threads for them to
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* inform the main binary that refresh events arrived
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* - replies to report any failures to the user
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*/
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let Context {
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ref mut work_controller,
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ref sender,
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ref mut replies,
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ref mut accounts,
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ref mut mailbox_hashes,
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..
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} = &mut s.context;
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for (x, account) in accounts.iter_mut().enumerate() {
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for folder in account.backend.folders().values() {
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debug!("hash & folder: {:?} {}", folder.hash(), folder.name());
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mailbox_hashes.insert(folder.hash(), x);
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}
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account.watch((work_controller, sender, replies));
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}
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}
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s.context.restore_input();
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s
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}
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/*
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* When we receive a folder hash from a watcher thread,
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* we match the hash to the index of the mailbox, request a reload
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* and startup a thread to remind us to poll it every now and then till it's finished.
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*/
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pub fn refresh_event(&mut self, event: RefreshEvent) {
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let hash = event.hash();
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if let Some(&idxa) = self.context.mailbox_hashes.get(&hash) {
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if self.context.accounts[idxa].status(hash).is_err() {
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self.context.replies.push_back(UIEvent::from(event));
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return;
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}
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let Context {
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ref mut work_controller,
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ref sender,
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ref mut replies,
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ref mut accounts,
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..
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} = &mut self.context;
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if let Some(notification) =
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accounts[idxa].reload(event, hash, (work_controller, sender, replies))
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{
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if let UIEvent::Notification(_, _, _) = notification {
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self.rcv_event(UIEvent::MailboxUpdate((idxa, hash)));
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}
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self.rcv_event(notification);
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}
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} else {
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debug!(
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"BUG: mailbox with hash {} not found in mailbox_hashes.",
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hash
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);
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}
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}
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/// If an owned thread returns a `ThreadEvent::ThreadJoin` event to `State` then it must remove
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/// the thread from its list and `join` it.
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pub fn join(&mut self, id: thread::ThreadId) {
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let (tx, handle) = self.threads.remove(&id).unwrap();
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tx.send(true).unwrap();
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handle.join().unwrap();
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}
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/// Switch back to the terminal's main screen (The command line the user sees before opening
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/// the application)
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pub fn switch_to_main_screen(&mut self) {
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write!(
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self.stdout(),
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"{}{}{}{}",
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termion::screen::ToMainScreen,
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cursor::Show,
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RestoreWindowTitleIconFromStack,
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BracketModeEnd,
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)
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.unwrap();
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self.flush();
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self.stdout = None;
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self.context.input.kill();
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}
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pub fn switch_to_alternate_screen(&mut self) {
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let s = std::io::stdout();
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let mut stdout = AlternateScreen::from(s.into_raw_mode().unwrap());
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write!(
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&mut stdout,
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"{save_title_to_stack}{}{}{}{window_title}{}{}",
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termion::screen::ToAlternateScreen,
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cursor::Hide,
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clear::All,
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cursor::Goto(1, 1),
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BracketModeStart,
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save_title_to_stack = SaveWindowTitleIconToStack,
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window_title = if let Some(ref title) = self.context.settings.terminal.window_title {
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format!("\x1b]2;{}\x07", title)
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} else {
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String::new()
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},
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)
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.unwrap();
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self.stdout = Some(stdout);
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self.flush();
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}
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pub fn receiver(&self) -> Receiver<ThreadEvent> {
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self.context.receiver.clone()
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}
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pub fn sender(&self) -> Sender<ThreadEvent> {
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self.context.sender.clone()
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}
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pub fn restore_input(&mut self) {
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self.context.restore_input();
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}
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/// On `SIGWNICH` the `State` redraws itself according to the new terminal size.
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pub fn update_size(&mut self) {
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let termsize = termion::terminal_size().ok();
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let termcols = termsize.map(|(w, _)| w);
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let termrows = termsize.map(|(_, h)| h);
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if termcols.unwrap_or(72) as usize != self.cols
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|| termrows.unwrap_or(120) as usize != self.rows
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{
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debug!(
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"Size updated, from ({}, {}) -> ({:?}, {:?})",
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self.cols, self.rows, termcols, termrows
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);
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}
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self.cols = termcols.unwrap_or(72) as usize;
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self.rows = termrows.unwrap_or(120) as usize;
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self.grid.resize(self.cols, self.rows, Cell::with_char(' '));
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self.rcv_event(UIEvent::Resize);
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// Invalidate dirty areas.
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self.context.dirty_areas.clear();
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}
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/// Force a redraw for all dirty components.
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pub fn redraw(&mut self) {
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for i in 0..self.components.len() {
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self.draw_component(i);
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}
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let mut areas: Vec<Area> = self.context.dirty_areas.drain(0..).collect();
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if areas.is_empty() {
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return;
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}
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/* Sort by x_start, ie upper_left corner's x coordinate */
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areas.sort_by(|a, b| (a.0).0.partial_cmp(&(b.0).0).unwrap());
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/* draw each dirty area */
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let rows = self.rows;
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for y in 0..rows {
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let mut segment = None;
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for ((x_start, y_start), (x_end, y_end)) in &areas {
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if y < *y_start || y > *y_end {
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continue;
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}
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if let Some((x_start, x_end)) = segment.take() {
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self.draw_horizontal_segment(x_start, x_end, y);
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}
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match segment {
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ref mut s @ None => {
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*s = Some((*x_start, *x_end));
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}
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ref mut s @ Some(_) if s.unwrap().1 < *x_start => {
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self.draw_horizontal_segment(s.unwrap().0, s.unwrap().1, y);
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*s = Some((*x_start, *x_end));
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}
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ref mut s @ Some(_) if s.unwrap().1 < *x_end => {
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self.draw_horizontal_segment(s.unwrap().0, s.unwrap().1, y);
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*s = Some((s.unwrap().1, *x_end));
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}
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Some((_, ref mut x)) => {
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*x = *x_end;
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}
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}
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}
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if let Some((x_start, x_end)) = segment {
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self.draw_horizontal_segment(x_start, x_end, y);
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}
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}
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self.flush();
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}
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/// Draw only a specific `area` on the screen.
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fn draw_horizontal_segment(&mut self, x_start: usize, x_end: usize, y: usize) {
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write!(
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self.stdout(),
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"{}",
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cursor::Goto(x_start as u16 + 1, (y + 1) as u16)
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)
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.unwrap();
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for x in x_start..=x_end {
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let c = self.grid[(x, y)];
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if c.bg() != Color::Default {
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c.bg().write_bg(self.stdout()).unwrap();
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}
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if c.fg() != Color::Default {
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c.fg().write_fg(self.stdout()).unwrap();
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}
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if c.attrs() != Attr::Default {
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write!(self.stdout(), "\x1B[{}m", c.attrs() as u8).unwrap();
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}
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if !c.empty() {
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write!(self.stdout(), "{}", c.ch()).unwrap();
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}
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if c.bg() != Color::Default {
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write!(
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self.stdout(),
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"{}",
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termion::color::Bg(termion::color::Reset)
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)
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.unwrap();
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}
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if c.fg() != Color::Default {
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write!(
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self.stdout(),
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"{}",
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termion::color::Fg(termion::color::Reset)
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)
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.unwrap();
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}
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if c.attrs() != Attr::Default {
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write!(self.stdout(), "\x1B[{}m", Attr::Default as u8).unwrap();
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}
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}
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}
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/// Draw the entire screen from scratch.
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pub fn render(&mut self) {
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self.update_size();
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let cols = self.cols;
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let rows = self.rows;
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self.context
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.dirty_areas
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.push_back(((0, 0), (cols - 1, rows - 1)));
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self.redraw();
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}
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pub fn draw_component(&mut self, idx: usize) {
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let component = &mut self.components[idx];
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let upper_left = (0, 0);
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let bottom_right = (self.cols - 1, self.rows - 1);
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if component.is_dirty() {
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component.draw(
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&mut self.grid,
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(upper_left, bottom_right),
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&mut self.context,
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);
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}
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}
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pub fn can_quit_cleanly(&mut self) -> bool {
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let State {
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ref mut components,
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ref context,
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..
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} = self;
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components.iter_mut().all(|c| c.can_quit_cleanly(context))
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}
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pub fn register_component(&mut self, component: Box<dyn Component>) {
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self.components.push(component);
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}
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/// Convert user commands to actions/method calls.
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fn parse_command(&mut self, cmd: &str) {
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if cmd == "insert" {
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crate::sqlite3::insert(&self.context).unwrap();
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return;
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} else if cmd.starts_with("_from") {
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debug!(crate::sqlite3::from(&cmd["_from".len()..]));
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return;
|
|
}
|
|
|
|
let result = parse_command(&cmd.as_bytes()).to_full_result();
|
|
|
|
if let Ok(v) = result {
|
|
match v {
|
|
SetEnv(key, val) => {
|
|
env::set_var(key.as_str(), val.as_str());
|
|
}
|
|
PrintEnv(key) => {
|
|
self.context.replies.push_back(UIEvent::StatusEvent(
|
|
StatusEvent::DisplayMessage(
|
|
env::var(key.as_str()).unwrap_or_else(|e| e.to_string()),
|
|
),
|
|
));
|
|
}
|
|
Folder(account_name, path, op) => {
|
|
if let Some(account) = self
|
|
.context
|
|
.accounts
|
|
.iter_mut()
|
|
.find(|a| a.name() == account_name)
|
|
{
|
|
if let Err(e) = account.folder_operation(&path, op) {
|
|
self.context.replies.push_back(UIEvent::StatusEvent(
|
|
StatusEvent::DisplayMessage(e.to_string()),
|
|
));
|
|
}
|
|
} else {
|
|
self.context.replies.push_back(UIEvent::StatusEvent(
|
|
StatusEvent::DisplayMessage(format!(
|
|
"Account with name `{}` not found.",
|
|
account_name
|
|
)),
|
|
));
|
|
}
|
|
}
|
|
v => {
|
|
self.rcv_event(UIEvent::Action(v));
|
|
}
|
|
}
|
|
} else {
|
|
self.context
|
|
.replies
|
|
.push_back(UIEvent::StatusEvent(StatusEvent::DisplayMessage(
|
|
"invalid command".to_string(),
|
|
)));
|
|
}
|
|
}
|
|
|
|
/// The application's main loop sends `UIEvents` to state via this method.
|
|
pub fn rcv_event(&mut self, mut event: UIEvent) {
|
|
match event {
|
|
// Command type is handled only by State.
|
|
UIEvent::Command(cmd) => {
|
|
self.parse_command(&cmd);
|
|
return;
|
|
}
|
|
UIEvent::Fork(ForkType::Finished) => {
|
|
/*
|
|
* Fork has finished in the past.
|
|
* We're back in the AlternateScreen, but the cursor is reset to Shown, so fix
|
|
* it.
|
|
write!(self.stdout(), "{}", cursor::Hide,).unwrap();
|
|
self.flush();
|
|
*/
|
|
self.switch_to_main_screen();
|
|
self.switch_to_alternate_screen();
|
|
self.context.restore_input();
|
|
return;
|
|
}
|
|
UIEvent::Fork(child) => {
|
|
self.mode = UIMode::Fork;
|
|
self.child = Some(child);
|
|
return;
|
|
}
|
|
UIEvent::ChangeMode(m) => {
|
|
if self.mode == UIMode::Embed {
|
|
self.context.input_from_raw();
|
|
}
|
|
self.context
|
|
.sender
|
|
.send(ThreadEvent::UIEvent(UIEvent::ChangeMode(m)))
|
|
.unwrap();
|
|
if m == UIMode::Embed {
|
|
self.context.input_to_raw();
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
/* inform each component */
|
|
for i in 0..self.components.len() {
|
|
self.components[i].process_event(&mut event, &mut self.context);
|
|
}
|
|
|
|
if !self.context.replies.is_empty() {
|
|
let replies: Vec<UIEvent> = self.context.replies.drain(0..).collect();
|
|
// Pass replies to self and call count on the map iterator to force evaluation
|
|
replies.into_iter().map(|r| self.rcv_event(r)).count();
|
|
}
|
|
}
|
|
|
|
pub fn try_wait_on_child(&mut self) -> Option<bool> {
|
|
let should_return_flag = match self.child {
|
|
Some(ForkType::NewDraft(_, ref mut c)) => {
|
|
let w = c.try_wait();
|
|
match w {
|
|
Ok(Some(_)) => true,
|
|
Ok(None) => false,
|
|
Err(e) => {
|
|
log(
|
|
format!("Failed to wait on editor process: {}", e.to_string()),
|
|
ERROR,
|
|
);
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
Some(ForkType::Generic(ref mut c)) => {
|
|
let w = c.try_wait();
|
|
match w {
|
|
Ok(Some(_)) => true,
|
|
Ok(None) => false,
|
|
Err(e) => {
|
|
log(
|
|
format!("Failed to wait on child process: {}", e.to_string()),
|
|
ERROR,
|
|
);
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
Some(ForkType::Finished) => {
|
|
/* Fork has already finished */
|
|
std::mem::replace(&mut self.child, None);
|
|
return None;
|
|
}
|
|
_ => {
|
|
return None;
|
|
}
|
|
};
|
|
if should_return_flag {
|
|
return Some(true);
|
|
}
|
|
Some(false)
|
|
}
|
|
fn flush(&mut self) {
|
|
if let Some(s) = self.stdout.as_mut() {
|
|
s.flush().unwrap();
|
|
}
|
|
}
|
|
fn stdout(&mut self) -> &mut StateStdout {
|
|
self.stdout.as_mut().unwrap()
|
|
}
|
|
}
|