485 lines
16 KiB
Rust
485 lines
16 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 Entity-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 Entities of the UI, which are currently plain Containers for `Component`s. In the application's main event loop, input is handed to the state in the form of `UIEvent` objects which traverse the entity 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 chan::Sender;
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use fnv::FnvHashMap;
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use std::io::Write;
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use std::thread;
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use std::time;
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use termion::raw::IntoRawMode;
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use termion::screen::AlternateScreen;
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use termion::{clear, cursor, style};
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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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mailbox_hashes: FnvHashMap<u64, (usize, 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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_backends: Backends,
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input_thread: chan::Sender<bool>,
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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_thread(&mut self) -> &mut chan::Sender<bool> {
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&mut self.input_thread
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}
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}
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/// A State object to manage and own components and entities 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<W: Write> {
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cols: usize,
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rows: usize,
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grid: CellBuffer,
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stdout: Option<termion::screen::AlternateScreen<termion::raw::RawTerminal<W>>>,
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child: Option<ForkType>,
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pub mode: UIMode,
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sender: Sender<ThreadEvent>,
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entities: Vec<Entity>,
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pub context: Context,
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startup_thread: Option<chan::Sender<bool>>,
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threads: FnvHashMap<thread::ThreadId, thread::JoinHandle<()>>,
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}
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impl<W: Write> Drop for State<W> {
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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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write!(
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self.stdout(),
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"{}{}{}{}",
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clear::All,
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style::Reset,
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cursor::Goto(1, 1),
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cursor::Show
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).unwrap();
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self.flush();
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}
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}
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impl State<std::io::Stdout> {
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pub fn new(sender: Sender<ThreadEvent>, input_thread: chan::Sender<bool>) -> Self {
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let _stdout = std::io::stdout();
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_stdout.lock();
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let settings = Settings::new();
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let backends = Backends::new();
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let stdout = AlternateScreen::from(_stdout.into_raw_mode().unwrap());
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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 mut accounts: Vec<Account> = settings
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.accounts
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.iter()
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.map(|(n, a_s)| Account::new(n.to_string(), a_s.clone(), &backends))
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.collect();
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accounts.sort_by(|a, b| a.name().cmp(&b.name()));
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let (startup_tx, startup_rx) = chan::async();
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let startup_thread = {
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let sender = sender.clone();
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let startup_rx = startup_rx.clone();
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thread::Builder::new()
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.name("startup-thread".to_string())
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.spawn(move || {
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let dur = time::Duration::from_millis(100);
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loop {
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chan_select! {
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default => {},
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startup_rx.recv() -> _ => {
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sender.send(ThreadEvent::ThreadJoin(thread::current().id()));
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return;
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}
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}
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sender.send(ThreadEvent::UIEvent(UIEventType::StartupCheck));
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thread::sleep(dur);
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}
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})
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.unwrap()
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};
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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: Some(stdout),
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child: None,
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mode: UIMode::Normal,
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sender,
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entities: 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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_backends: backends,
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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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input_thread,
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},
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startup_thread: Some(startup_tx),
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threads: FnvHashMap::with_capacity_and_hasher(1, Default::default()),
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};
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s.threads
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.insert(startup_thread.thread().id(), startup_thread);
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write!(
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s.stdout(),
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"{}{}{}",
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cursor::Hide,
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clear::All,
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cursor::Goto(1, 1)
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).unwrap();
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s.flush();
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for (x, account) in s.context.accounts.iter_mut().enumerate() {
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for (y, folder) in account.settings.folders.iter().enumerate() {
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s.context.mailbox_hashes.insert(folder.hash(), (x, y));
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}
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let sender = s.sender.clone();
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account.watch(RefreshEventConsumer::new(Box::new(move |r| {
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sender.send(ThreadEvent::from(r));
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})));
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}
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s
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}
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pub fn hash_to_folder(&self, hash: u64) {
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eprintln!("got refresh {:?}", self.context.mailbox_hashes[&hash]);
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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 handle = self.threads.remove(&id).unwrap();
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handle.join().unwrap();
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}
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/// If startup has finished, inform startup thread that it doesn't need to tick us with startup
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/// check reminders and let it die.
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pub fn finish_startup(&mut self) {
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// TODO: Encode startup process with the type system if possible
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if self.startup_thread.is_none() {
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return;
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}
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{
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let tx = self.startup_thread.take().unwrap();
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tx.send(true);
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}
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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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).unwrap();
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self.flush();
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self.stdout = None;
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self.context.input_thread.send(false);
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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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s.lock();
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self.stdout = Some(AlternateScreen::from(s.into_raw_mode().unwrap()));
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write!(
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self.stdout(),
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"{}{}",
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termion::screen::ToAlternateScreen,
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cursor::Hide
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).unwrap();
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self.flush();
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}
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}
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impl<W: Write> State<W> {
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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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eprintln!(
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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 {
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id: 0,
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event_type: UIEventType::Resize,
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});
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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.entities.len() {
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self.draw_entity(i);
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}
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let areas: Vec<Area> = self.context.dirty_areas.drain(0..).collect();
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/* draw each dirty area */
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for a in areas {
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self.draw_area(a);
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}
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}
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/// Draw only a specific `area` on the screen.
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fn draw_area(&mut self, area: Area) {
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let upper_left = upper_left!(area);
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let bottom_right = bottom_right!(area);
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for y in get_y(upper_left)..=get_y(bottom_right) {
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write!(
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self.stdout(),
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"{}",
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cursor::Goto(get_x(upper_left) as u16 + 1, (y + 1) as u16)
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).unwrap();
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for x in get_x(upper_left)..=get_x(bottom_right) {
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let c = self.grid[(x, y)];
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if c.bg() != Color::Default {
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write!(self.stdout(), "{}", termion::color::Bg(c.bg().as_termion())).unwrap();
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}
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if c.fg() != Color::Default {
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write!(self.stdout(), "{}", termion::color::Fg(c.fg().as_termion())).unwrap();
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}
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write!(self.stdout(), "{}", c.ch()).unwrap();
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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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).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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).unwrap();
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}
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}
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}
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self.flush();
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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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/* draw each entity */
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for i in 0..self.entities.len() {
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self.draw_entity(i);
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}
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let cols = self.cols;
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let rows = self.rows;
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self.draw_area(((0, 0), (cols - 1, rows - 1)));
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}
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pub fn draw_entity(&mut self, idx: usize) {
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let entity = &mut self.entities[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 entity.component.is_dirty() {
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entity.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 register_entity(&mut self, entity: Entity) {
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self.entities.push(entity);
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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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let result = parse_command(&cmd.as_bytes()).to_full_result();
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if let Ok(v) = result {
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self.rcv_event(UIEvent {
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id: 0,
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event_type: UIEventType::Action(v),
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});
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}
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}
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/// The application's main loop sends `UIEvents` to state via this method.
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pub fn rcv_event(&mut self, event: UIEvent) {
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match event.event_type {
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// Command type is handled only by State.
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UIEventType::Command(cmd) => {
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self.parse_command(&cmd);
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return;
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}
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UIEventType::Fork(child) => {
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self.mode = UIMode::Fork;
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self.child = Some(child);
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self.flush();
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return;
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}
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UIEventType::EditDraft(mut file) => {
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eprintln!("edit draft event");
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use std::io::Read;
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use std::process::{Command, Stdio};
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let mut output = Command::new("msmtp")
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.arg("-t")
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.spawn()
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.expect("failed to execute process");
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{
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let mut in_pipe = output.stdin.as_mut().unwrap();
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let mut buf = Vec::new();
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let mut f = file.file();
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f.read_to_end(&mut buf).unwrap();
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in_pipe.write_all(&buf).unwrap();
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}
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output.wait_with_output().expect("Failed to read stdout");
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return;
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}
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UIEventType::Input(Key::Char('t')) => for i in 0..self.entities.len() {
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self.entities[i].rcv_event(
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&UIEvent {
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id: 0,
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event_type: UIEventType::Action(Action::MailListing(
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MailListingAction::ToggleThreaded,
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)),
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},
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&mut self.context,
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);
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},
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_ => {}
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}
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/* inform each entity */
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for i in 0..self.entities.len() {
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self.entities[i].rcv_event(&event, &mut self.context);
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}
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if !self.context.replies.is_empty() {
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let replies: Vec<UIEvent> = self.context.replies.drain(0..).collect();
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// Pass replies to self and call count on the map iterator to force evaluation
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replies.into_iter().map(|r| self.rcv_event(r)).count();
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}
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}
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/// Tries to load a mailbox's content
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pub fn refresh_mailbox(&mut self, account_idx: usize, folder_idx: usize) {
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let flag = match &mut self.context.accounts[account_idx][folder_idx] {
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Ok(_) => true,
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Err(e) => {
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eprintln!("error {:?}", e);
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false
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}
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};
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if flag {
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self.rcv_event(UIEvent {
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id: 0,
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event_type: UIEventType::RefreshMailbox((account_idx, folder_idx)),
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});
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}
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}
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pub fn try_wait_on_child(&mut self) -> Option<bool> {
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if match self.child {
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Some(ForkType::NewDraft(_, ref mut c)) => {
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let mut w = c.try_wait();
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match w {
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Ok(Some(_)) => true,
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Ok(None) => false,
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Err(_) => {
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return None;
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}
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}
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}
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Some(ForkType::Generic(ref mut c)) => {
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let mut w = c.try_wait();
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match w {
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Ok(Some(_)) => true,
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Ok(None) => false,
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Err(_) => {
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return None;
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}
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}
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}
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_ => {
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return None;
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}
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}
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{
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if let Some(ForkType::NewDraft(f, _)) = std::mem::replace(&mut self.child, None) {
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self.rcv_event(UIEvent {
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id: 0,
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event_type: UIEventType::EditDraft(f),
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});
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}
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return Some(true);
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}
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Some(false)
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}
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fn flush(&mut self) {
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if let Some(s) = self.stdout.as_mut() { s.flush().unwrap(); }
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}
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fn stdout(&mut self) -> &mut termion::screen::AlternateScreen<termion::raw::RawTerminal<W>> {
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self.stdout.as_mut().unwrap()
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}
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}
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