Refactor ui module

8 files changed, 656 insertions, 634 deletions

diff --git a/ui/src/components/mod.rs b/ui/src/components/mod.rs
index dc56caaf..c900d1e2 100644
--- a/ui/src/components/mod.rs
+++ b/ui/src/components/mod.rs
@@ -26,17 +26,17 @@
   */
 
 use super::*;
+
 pub mod mail;
+pub use mail::*;
+
 pub mod notifications;
-pub mod utilities;
 
-pub use mail::*;
+pub mod utilities;
 pub use self::utilities::*;
 
-use super::cells::{CellBuffer, Color};
-use super::position::Area;
-use super::{Key, UIEvent, UIEventType};
 
+use super::{Key, UIEvent, UIEventType};
 /// The upper and lower boundary char.
 const HORZ_BOUNDARY: char = '─';
 /// The left and right boundary char.
diff --git a/ui/src/lib.rs b/ui/src/lib.rs
index 3fe6ea02..7bd9497d 100644
--- a/ui/src/lib.rs
+++ b/ui/src/lib.rs
@@ -19,29 +19,6 @@
  * along with meli. If not, see <http://www.gnu.org/licenses/>.
  */
 
-/*!
-  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.
-
-  `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.
-
-  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`.
-  */
-
-#[macro_use]
-mod position;
-mod cells;
-pub mod components;
-
-mod helpers;
-pub use helpers::*;
-
-#[macro_use]
-mod execute;
-use execute::*;
-use self::cells::*;
-pub use self::components::*;
-pub use self::position::*;
-
 extern crate melib;
 extern crate mime_apps;
 extern crate notify_rust;
@@ -50,620 +27,26 @@ extern crate chan;
 extern crate chan_signal;
 extern crate linkify;
 extern crate uuid;
-use melib::*;
 
-use std::collections::VecDeque;
-use std::fmt;
-use std::io::Write;
-use std::thread;
-use std::time;
 extern crate fnv;
-use self::fnv::FnvHashMap;
 extern crate termion;
-use termion::event::Key as TermionKey;
-use termion::input::TermRead;
-use termion::raw::IntoRawMode;
-use termion::screen::AlternateScreen;
-use termion::{clear, cursor, style};
 
 #[macro_use]
 extern crate nom;
-use chan::Sender;
-
-
-/// `ThreadEvent` encapsulates all of the possible values we need to transfer between our threads
-/// to the main process.
-#[derive(Debug)]
-pub enum ThreadEvent {
-    ThreadJoin(thread::ThreadId),
-    /// User input.
-    Input(Key),
-    /// A watched folder has been refreshed.
-    RefreshMailbox {
-        hash: u64,
-    },
-    UIEvent(UIEventType),
-    //Decode { _ }, // For gpg2 signature check
-}
-
-impl From<RefreshEvent> for ThreadEvent {
-    fn from(event: RefreshEvent) -> Self {
-        ThreadEvent::RefreshMailbox { hash: event.hash }
-    }
-}
-
-#[derive(Debug)]
-pub enum ForkType {
-    Generic(std::process::Child),
-    NewDraft(File, std::process::Child),
-}
-
-#[derive(Debug)]
-pub enum UIEventType {
-    Input(Key),
-    ExInput(Key),
-    RefreshMailbox((usize, usize)),
-    //Quit?
-    Resize,
-    /// Force redraw.
-    Fork(ForkType),
-    ChangeMailbox(usize),
-    ChangeMode(UIMode),
-    Command(String),
-    Notification(String),
-    EditDraft(File),
-    Action(Action),
-    StatusNotification(String),
-    MailboxUpdate((usize, usize)),
-
-    StartupCheck,
-}
-
-/// An event passed from `State` to its Entities.
-#[derive(Debug)]
-pub struct UIEvent {
-    pub id: u64,
-    pub event_type: UIEventType,
-}
-
-#[derive(Debug, PartialEq, Copy, Clone)]
-pub enum UIMode {
-    Normal,
-    Execute,
-    Fork,
-}
-
-impl fmt::Display for UIMode {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(
-            f,
-            "{}",
-            match *self {
-                UIMode::Normal => "NORMAL",
-                UIMode::Execute => "EX",
-                UIMode::Fork => "FORK",
-            }
-        )
-    }
-}
-
-/// An event notification that is passed to Entities for handling.
-pub struct Notification {
-    _title: String,
-    _content: String,
-
-    _timestamp: std::time::Instant,
-}
-
-/// A context container for loaded settings, accounts, UI changes, etc.
-pub struct Context {
-    pub accounts: Vec<Account>,
-    settings: Settings,
-
-    runtime_settings: Settings,
-    /// Areas of the screen that must be redrawn in the next render
-    dirty_areas: VecDeque<Area>,
-
-    /// Events queue that components send back to the state
-    replies: VecDeque<UIEvent>,
-    _backends: Backends,
-
-    input_thread: chan::Sender<bool>,
-}
-
-impl Context {
-    pub fn replies(&mut self) -> Vec<UIEvent> {
-        self.replies.drain(0..).collect()
-    }
-    pub fn input_thread(&mut self) -> &mut chan::Sender<bool> {
-        &mut self.input_thread
-    }
-}
-
-/// A State object to manage and own components and entities of the UI. `State` is responsible for
-/// managing the terminal and interfacing with `melib`
-pub struct State<W: Write> {
-    cols: usize,
-    rows: usize,
-
-    grid: CellBuffer,
-    stdout: Option<termion::screen::AlternateScreen<termion::raw::RawTerminal<W>>>,
-    child: Option<ForkType>,
-    pub mode: UIMode,
-    sender: Sender<ThreadEvent>,
-    entities: Vec<Entity>,
-    pub context: Context,
-
-    startup_thread: Option<chan::Sender<bool>>,
-
-    threads: FnvHashMap<thread::ThreadId, thread::JoinHandle<()>>,
-}
 
-impl<W: Write> Drop for State<W> {
-    fn drop(&mut self) {
-        // When done, restore the defaults to avoid messing with the terminal.
-        write!(
-            self.stdout(),
-            "{}{}{}{}",
-            clear::All,
-            style::Reset,
-            cursor::Goto(1, 1),
-            cursor::Show
-        ).unwrap();
-        self.flush();
-    }
-}
-
-impl State<std::io::Stdout> {
-    pub fn new(sender: Sender<ThreadEvent>, input_thread: chan::Sender<bool>) -> Self {
-        let _stdout = std::io::stdout();
-        _stdout.lock();
-        let settings = Settings::new();
-        let backends = Backends::new();
-        let stdout = AlternateScreen::from(_stdout.into_raw_mode().unwrap());
-
-        let termsize = termion::terminal_size().ok();
-        let termcols = termsize.map(|(w, _)| w);
-        let termrows = termsize.map(|(_, h)| h);
-        let cols = termcols.unwrap_or(0) as usize;
-        let rows = termrows.unwrap_or(0) as usize;
-        let mut accounts: Vec<Account> = settings
-            .accounts
-            .iter()
-            .map(|(n, a_s)| Account::new(n.to_string(), a_s.clone(), &backends))
-            .collect();
-        accounts.sort_by(|a, b| a.name().cmp(&b.name()));
-        let (startup_tx, startup_rx) = chan::async();
-        let startup_thread = {
-            let sender = sender.clone();
-            let startup_rx = startup_rx.clone();
-
-            thread::Builder::new()
-                .name("startup-thread".to_string())
-                .spawn(move || {
-                    let dur = time::Duration::from_millis(100);
-                    loop {
-                        chan_select! {
-                            default => {},
-                            startup_rx.recv() -> _ => {
-                                sender.send(ThreadEvent::ThreadJoin(thread::current().id()));
-                                return;
-                            }
-                        }
-                        sender.send(ThreadEvent::UIEvent(UIEventType::StartupCheck));
-                        thread::sleep(dur);
-                    }
-                }).unwrap()
-        };
-        let mut s = State {
-            cols: cols,
-            rows: rows,
-            grid: CellBuffer::new(cols, rows, Cell::with_char(' ')),
-            stdout: Some(stdout),
-            child: None,
-            mode: UIMode::Normal,
-            sender: sender,
-            entities: Vec::with_capacity(1),
-
-            context: Context {
-                accounts: accounts,
-                _backends: backends,
-                settings: settings.clone(),
-                runtime_settings: settings,
-                dirty_areas: VecDeque::with_capacity(5),
-                replies: VecDeque::with_capacity(5),
-
-                input_thread: input_thread,
-            },
-            startup_thread: Some(startup_tx),
-            threads: FnvHashMap::with_capacity_and_hasher(1, Default::default()),
-        };
-        s.threads.insert(startup_thread.thread().id(), startup_thread);
-        write!(
-            s.stdout(),
-            "{}{}{}",
-            cursor::Hide,
-            clear::All,
-            cursor::Goto(1, 1)
-            ).unwrap();
-        s.flush();
-        for account in &mut s.context.accounts {
-            let sender = s.sender.clone();
-            account.watch(RefreshEventConsumer::new(Box::new(move |r| {
-                sender.send(ThreadEvent::from(r));
-            })));
-        }
-        s
-    }
-    pub fn join(&mut self, id: thread::ThreadId) {
-        let handle = self.threads.remove(&id).unwrap();
-        handle.join().unwrap();
-
-
-    }
-    pub fn finish_startup(&mut self) {
-        // TODO: Encode startup process with the type system if possible
-        if self.startup_thread.is_none() {
-            return;
-        }
-        {
-            let tx =  self.startup_thread.take().unwrap();
-            tx.send(true);
-        }
-    }
-    pub fn to_main_screen(&mut self) {
-        write!(
-            self.stdout(),
-            "{}{}",
-            termion::screen::ToMainScreen,
-            cursor::Show
-        ).unwrap();
-        self.flush();
-        self.stdout = None;
-        self.context.input_thread.send(false);
-    }
-    pub fn to_alternate_screen(&mut self) {
-        let s = std::io::stdout();
-        s.lock();
-        self.stdout = Some(AlternateScreen::from(s.into_raw_mode().unwrap()));
-
-        write!(
-            self.stdout(),
-            "{}{}",
-            termion::screen::ToAlternateScreen,
-            cursor::Hide
-        ).unwrap();
-        self.flush();
-    }
-}
-impl<W: Write> State<W> {
-    pub fn update_size(&mut self) {
-        let termsize = termion::terminal_size().ok();
-        let termcols = termsize.map(|(w, _)| w);
-        let termrows = termsize.map(|(_, h)| h);
-        if termcols.unwrap_or(72) as usize != self.cols
-            || termrows.unwrap_or(120) as usize != self.rows
-        {
-            eprintln!(
-                "Size updated, from ({}, {}) -> ({:?}, {:?})",
-                self.cols, self.rows, termcols, termrows
-            );
-        }
-        self.cols = termcols.unwrap_or(72) as usize;
-        self.rows = termrows.unwrap_or(120) as usize;
-        self.grid.resize(self.cols, self.rows, Cell::with_char(' '));
-
-        self.rcv_event(UIEvent {
-            id: 0,
-            event_type: UIEventType::Resize,
-        });
-    }
-
-    pub fn redraw(&mut self) {
-        for i in 0..self.entities.len() {
-            self.draw_entity(i);
-        }
-        let areas: Vec<Area> = self.context.dirty_areas.drain(0..).collect();
-        /* draw each dirty area */
-        for a in areas {
-            self.draw_area(a);
-        }
-    }
-    fn draw_area(&mut self, area: Area) {
-        let upper_left = upper_left!(area);
-        let bottom_right = bottom_right!(area);
-
-        for y in get_y(upper_left)..=get_y(bottom_right) {
-            write!(
-                self.stdout(),
-                "{}",
-                cursor::Goto(get_x(upper_left) as u16 + 1, (y + 1) as u16)
-            ).unwrap();
-            for x in get_x(upper_left)..=get_x(bottom_right) {
-                let c = self.grid[(x, y)];
-
-                if c.bg() != cells::Color::Default {
-                    write!(self.stdout(), "{}", termion::color::Bg(c.bg().as_termion())).unwrap();
-                }
-                if c.fg() != cells::Color::Default {
-                    write!(self.stdout(), "{}", termion::color::Fg(c.fg().as_termion())).unwrap();
-                }
-                write!(self.stdout(), "{}", c.ch()).unwrap();
-                if c.bg() != cells::Color::Default {
-                    write!(
-                        self.stdout(),
-                        "{}",
-                        termion::color::Bg(termion::color::Reset)
-                    ).unwrap();
-                }
-                if c.fg() != cells::Color::Default {
-                    write!(
-                        self.stdout(),
-                        "{}",
-                        termion::color::Fg(termion::color::Reset)
-                    ).unwrap();
-                }
-            }
-        }
-        self.flush();
-    }
-    pub fn render(&mut self) {
-        self.update_size();
-
-        /* draw each entity */
-        for i in 0..self.entities.len() {
-            self.draw_entity(i);
-        }
-        let cols = self.cols;
-        let rows = self.rows;
-
-        self.draw_area(((0, 0), (cols - 1, rows - 1)));
-    }
-    pub fn draw_entity(&mut self, idx: usize) {
-        let entity = &mut self.entities[idx];
-        let upper_left = (0, 0);
-        let bottom_right = (self.cols - 1, self.rows - 1);
-
-        if entity.component.is_dirty() {
-            entity.component.draw(
-                &mut self.grid,
-                (upper_left, bottom_right),
-                &mut self.context,
-            );
-        }
-    }
-    pub fn register_entity(&mut self, entity: Entity) {
-        self.entities.push(entity);
-    }
-    /// Convert user commands to actions/method calls.
-    fn parse_command(&mut self, cmd: String) {
-        let result = parse_command(&cmd.as_bytes()).to_full_result();
-
-        if let Ok(v) = result {
-            self.rcv_event(UIEvent { id: 0, event_type: UIEventType::Action(v) });
-        }
-    }
-
-    pub fn rcv_event(&mut self, event: UIEvent) {
-        match event.event_type {
-            // Command type is handled only by State.
-            UIEventType::Command(cmd) => {
-                self.parse_command(cmd);
-                return;
-            }
-            UIEventType::Fork(child) => {
-                self.mode = UIMode::Fork;
-                self.child = Some(child);
-                self.flush();
-                return;
-            }
-            UIEventType::EditDraft(mut file) => {
-                use std::io::Read;
-                use std::process::{Command, Stdio};
-                let mut output = Command::new("msmtp")
-                    .arg("-t")
-                    .stdin(Stdio::piped())
-                    .stdout(Stdio::piped())
-                    .spawn()
-                    .expect("failed to execute process");
-                {
-                    let mut in_pipe = output.stdin.as_mut().unwrap();
-                    let mut buf = Vec::new();
-                    let mut f = file.file();
-
-                    f.read_to_end(&mut buf).unwrap();
-                    in_pipe.write(&buf).unwrap();
-                    std::fs::remove_file(file.path()).unwrap();
-                }
-                output.wait_with_output().expect("Failed to read stdout");
-
-                return;
-            }
-            UIEventType::Input(Key::Char('t')) => for i in 0..self.entities.len() {
-                self.entities[i].rcv_event(
-                    &UIEvent {
-                        id: 0,
-                        event_type: UIEventType::Action(Action::MailListing(
-                            MailListingAction::ToggleThreaded,
-                        )),
-                    },
-                    &mut self.context,
-                );
-            },
-
-            _ => {}
-        }
-        /* inform each entity */
-        for i in 0..self.entities.len() {
-            self.entities[i].rcv_event(&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();
-        }
-    }
-
-    /// Tries to load a mailbox's content
-    pub fn refresh_mailbox(&mut self, account_idx: usize, folder_idx: usize) {
-        let flag = match &mut self.context.accounts[account_idx][folder_idx] {
-            Ok(_) => true,
-            Err(e) => {
-                eprintln!("error {:?}", e);
-                false
-            }
-        };
-        if flag {
-            self.rcv_event(UIEvent {
-                id: 0,
-                event_type: UIEventType::RefreshMailbox((account_idx, folder_idx)),
-            });
-        }
-    }
-    pub fn try_wait_on_child(&mut self) -> Option<bool> {
-        if {
-            match self.child {
-                Some(ForkType::NewDraft(_, ref mut c)) => {
-                    let mut w = c.try_wait();
-                    match w {
-                        Ok(Some(_)) => true,
-                        Ok(None) => false,
-                        Err(_) => {
-                            return None;
-                        }
-                    }
-                }
-                Some(ForkType::Generic(ref mut c)) => {
-                    let mut w = c.try_wait();
-                    match w {
-                        Ok(Some(_)) => true,
-                        Ok(None) => false,
-                        Err(_) => {
-                            return None;
-                        }
-                    }
-                }
-                _ => {
-                    return None;
-                }
-            }
-        } {
-            if let Some(ForkType::NewDraft(f, _)) = std::mem::replace(&mut self.child, None) {
-                self.rcv_event(UIEvent {
-                    id: 0,
-                    event_type: UIEventType::EditDraft(f),
-                });
-            }
-            return Some(true);
-        }
-        Some(false)
-    }
-    fn flush(&mut self) {
-        self.stdout.as_mut().map(|s| s.flush().unwrap());
-    }
-    fn stdout(&mut self) -> &mut termion::screen::AlternateScreen<termion::raw::RawTerminal<W>> {
-        self.stdout.as_mut().unwrap()
-    }
-}
-
-#[derive(Debug)]
-pub enum Key {
-    /// Backspace.
-    Backspace,
-    /// Left arrow.
-    Left,
-    /// Right arrow.
-    Right,
-    /// Up arrow.
-    Up,
-    /// Down arrow.
-    Down,
-    /// Home key.
-    Home,
-    /// End key.
-    End,
-    /// Page Up key.
-    PageUp,
-    /// Page Down key.
-    PageDown,
-    /// Delete key.
-    Delete,
-    /// Insert key.
-    Insert,
-    /// Function keys.
-    ///
-    /// Only function keys 1 through 12 are supported.
-    F(u8),
-    /// Normal character.
-    Char(char),
-    /// Alt modified character.
-    Alt(char),
-    /// Ctrl modified character.
-    ///
-    /// Note that certain keys may not be modifiable with `ctrl`, due to limitations of terminals.
-    Ctrl(char),
-    /// Null byte.
-    Null,
-    /// Esc key.
-    Esc,
-}
+use melib::*;
+use std::collections::VecDeque;
 
-impl From<TermionKey> for Key {
-    fn from(k: TermionKey) -> Self {
-        match k {
-            TermionKey::Backspace => Key::Backspace,
-            TermionKey::Left => Key::Left,
-            TermionKey::Right => Key::Right,
-            TermionKey::Up => Key::Up,
-            TermionKey::Down => Key::Down,
-            TermionKey::Home => Key::Home,
-            TermionKey::End => Key::End,
-            TermionKey::PageUp => Key::PageUp,
-            TermionKey::PageDown => Key::PageDown,
-            TermionKey::Delete => Key::Delete,
-            TermionKey::Insert => Key::Insert,
-            TermionKey::F(u) => Key::F(u),
-            TermionKey::Char(c) => Key::Char(c),
-            TermionKey::Alt(c) => Key::Alt(c),
-            TermionKey::Ctrl(c) => Key::Ctrl(c),
-            TermionKey::Null => Key::Null,
-            TermionKey::Esc => Key::Esc,
-            _ => Key::Char(' '),
-        }
-    }
-}
+#[macro_use]
+mod types;
+pub use types::*;
 
-/*
- * If we fork (for example start $EDITOR) we want the input-thread to stop reading from stdin. The
- * best way I came up with right now is to send a signal to the thread that is read in the first
- * input in stdin after the fork, and then the thread kills itself. The parent process spawns a new
- * input-thread when the child returns.
- *
- * The main loop uses try_wait_on_child() to check if child has exited.
- */
-pub fn get_events(
-    stdin: std::io::Stdin,
-    mut closure: impl FnMut(Key),
-    mut exit: impl FnMut(),
-    rx: chan::Receiver<bool>,
-) -> () {
-    for c in stdin.keys() {
-        chan_select! {
-            default => {},
-            rx.recv() -> val => {
-                if let Some(true) = val {
-                    exit();
-                    return;
-                } else if let Some(false) = val {
-                    return;
-                }
-            }
+#[macro_use]
+mod execute;
+use execute::*;
 
+pub mod state;
+pub use state::*;
 
-        };
-        if let Ok(k) = c {
-            closure(Key::from(k));
-        }
-    }
-}
+pub mod components;
+pub use components::*;
diff --git a/ui/src/state.rs b/ui/src/state.rs
new file mode 100644
index 00000000..bcd9b5af
--- /dev/null
+++ b/ui/src/state.rs
@@ -0,0 +1,430 @@
+/*!
+  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.
+
+  `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.
+
+  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`.
+  */
+
+use super::*;
+use chan::Sender;
+use fnv::FnvHashMap;
+use termion::raw::IntoRawMode;
+use termion::screen::AlternateScreen;
+use termion::{clear, cursor, style};
+use std::io::Write;
+use std::thread;
+use std::time;
+
+
+/// A context container for loaded settings, accounts, UI changes, etc.
+pub struct Context {
+    pub accounts: Vec<Account>,
+    pub settings: Settings,
+
+    pub runtime_settings: Settings,
+    /// Areas of the screen that must be redrawn in the next render
+    pub dirty_areas: VecDeque<Area>,
+
+    /// Events queue that components send back to the state
+    pub replies: VecDeque<UIEvent>,
+    _backends: Backends,
+
+    input_thread: chan::Sender<bool>,
+}
+
+impl Context {
+    pub fn replies(&mut self) -> Vec<UIEvent> {
+        self.replies.drain(0..).collect()
+    }
+    pub fn input_thread(&mut self) -> &mut chan::Sender<bool> {
+        &mut self.input_thread
+    }
+}
+
+/// A State object to manage and own components and entities of the UI. `State` is responsible for
+/// managing the terminal and interfacing with `melib`
+pub struct State<W: Write> {
+    cols: usize,
+    rows: usize,
+
+    grid: CellBuffer,
+    stdout: Option<termion::screen::AlternateScreen<termion::raw::RawTerminal<W>>>,
+    child: Option<ForkType>,
+    pub mode: UIMode,
+    sender: Sender<ThreadEvent>,
+    entities: Vec<Entity>,
+    pub context: Context,
+
+    startup_thread: Option<chan::Sender<bool>>,
+
+    threads: FnvHashMap<thread::ThreadId, thread::JoinHandle<()>>,
+}
+
+impl<W: Write> Drop for State<W> {
+    fn drop(&mut self) {
+        // When done, restore the defaults to avoid messing with the terminal.
+        write!(
+            self.stdout(),
+            "{}{}{}{}",
+            clear::All,
+            style::Reset,
+            cursor::Goto(1, 1),
+            cursor::Show
+        ).unwrap();
+        self.flush();
+    }
+}
+
+impl State<std::io::Stdout> {
+    pub fn new(sender: Sender<ThreadEvent>, input_thread: chan::Sender<bool>) -> Self {
+        let _stdout = std::io::stdout();
+        _stdout.lock();
+        let settings = Settings::new();
+        let backends = Backends::new();
+        let stdout = AlternateScreen::from(_stdout.into_raw_mode().unwrap());
+
+        let termsize = termion::terminal_size().ok();
+        let termcols = termsize.map(|(w, _)| w);
+        let termrows = termsize.map(|(_, h)| h);
+        let cols = termcols.unwrap_or(0) as usize;
+        let rows = termrows.unwrap_or(0) as usize;
+        let mut accounts: Vec<Account> = settings
+            .accounts
+            .iter()
+            .map(|(n, a_s)| Account::new(n.to_string(), a_s.clone(), &backends))
+            .collect();
+        accounts.sort_by(|a, b| a.name().cmp(&b.name()));
+        let (startup_tx, startup_rx) = chan::async();
+        let startup_thread = {
+            let sender = sender.clone();
+            let startup_rx = startup_rx.clone();
+
+            thread::Builder::new()
+                .name("startup-thread".to_string())
+                .spawn(move || {
+                    let dur = time::Duration::from_millis(100);
+                    loop {
+                        chan_select! {
+                            default => {},
+                            startup_rx.recv() -> _ => {
+                                sender.send(ThreadEvent::ThreadJoin(thread::current().id()));
+                                return;
+                            }
+                        }
+                        sender.send(ThreadEvent::UIEvent(UIEventType::StartupCheck));
+                        thread::sleep(dur);
+                    }
+                }).unwrap()
+        };
+        let mut s = State {
+            cols: cols,
+            rows: rows,
+            grid: CellBuffer::new(cols, rows, Cell::with_char(' ')),
+            stdout: Some(stdout),
+            child: None,
+            mode: UIMode::Normal,
+            sender: sender,
+            entities: Vec::with_capacity(1),
+
+            context: Context {
+                accounts: accounts,
+                _backends: backends,
+                settings: settings.clone(),
+                runtime_settings: settings,
+                dirty_areas: VecDeque::with_capacity(5),
+                replies: VecDeque::with_capacity(5),
+
+                input_thread: input_thread,
+            },
+            startup_thread: Some(startup_tx),
+            threads: FnvHashMap::with_capacity_and_hasher(1, Default::default()),
+        };
+        s.threads.insert(startup_thread.thread().id(), startup_thread);
+        write!(
+            s.stdout(),
+            "{}{}{}",
+            cursor::Hide,
+            clear::All,
+            cursor::Goto(1, 1)
+            ).unwrap();
+        s.flush();
+        for account in &mut s.context.accounts {
+            let sender = s.sender.clone();
+            account.watch(RefreshEventConsumer::new(Box::new(move |r| {
+                sender.send(ThreadEvent::from(r));
+            })));
+        }
+        s
+    }
+
+    pub fn join(&mut self, id: thread::ThreadId) {
+        let handle = self.threads.remove(&id).unwrap();
+        handle.join().unwrap();
+    }
+
+    pub fn finish_startup(&mut self) {
+        // TODO: Encode startup process with the type system if possible
+        if self.startup_thread.is_none() {
+            return;
+        }
+        {
+            let tx =  self.startup_thread.take().unwrap();
+            tx.send(true);
+        }
+    }
+    pub fn to_main_screen(&mut self) {
+        write!(
+            self.stdout(),
+            "{}{}",
+            termion::screen::ToMainScreen,
+            cursor::Show
+        ).unwrap();
+        self.flush();
+        self.stdout = None;
+        self.context.input_thread.send(false);
+    }
+    pub fn to_alternate_screen(&mut self) {
+        let s = std::io::stdout();
+        s.lock();
+        self.stdout = Some(AlternateScreen::from(s.into_raw_mode().unwrap()));
+
+        write!(
+            self.stdout(),
+            "{}{}",
+            termion::screen::ToAlternateScreen,
+            cursor::Hide
+        ).unwrap();
+        self.flush();
+    }
+}
+impl<W: Write> State<W> {
+    pub fn update_size(&mut self) {
+        let termsize = termion::terminal_size().ok();
+        let termcols = termsize.map(|(w, _)| w);
+        let termrows = termsize.map(|(_, h)| h);
+        if termcols.unwrap_or(72) as usize != self.cols
+            || termrows.unwrap_or(120) as usize != self.rows
+        {
+            eprintln!(
+                "Size updated, from ({}, {}) -> ({:?}, {:?})",
+                self.cols, self.rows, termcols, termrows
+            );
+        }
+        self.cols = termcols.unwrap_or(72) as usize;
+        self.rows = termrows.unwrap_or(120) as usize;
+        self.grid.resize(self.cols, self.rows, Cell::with_char(' '));
+
+        self.rcv_event(UIEvent {
+            id: 0,
+            event_type: UIEventType::Resize,
+        });
+    }
+
+    pub fn redraw(&mut self) {
+        for i in 0..self.entities.len() {
+            self.draw_entity(i);
+        }
+        let areas: Vec<Area> = self.context.dirty_areas.drain(0..).collect();
+        /* draw each dirty area */
+        for a in areas {
+            self.draw_area(a);
+        }
+    }
+    fn draw_area(&mut self, area: Area) {
+        let upper_left = upper_left!(area);
+        let bottom_right = bottom_right!(area);
+
+        for y in get_y(upper_left)..=get_y(bottom_right) {
+            write!(
+                self.stdout(),
+                "{}",
+                cursor::Goto(get_x(upper_left) as u16 + 1, (y + 1) as u16)
+            ).unwrap();
+            for x in get_x(upper_left)..=get_x(bottom_right) {
+                let c = self.grid[(x, y)];
+
+                if c.bg() != Color::Default {
+                    write!(self.stdout(), "{}", termion::color::Bg(c.bg().as_termion())).unwrap();
+                }
+                if c.fg() != Color::Default {
+                    write!(self.stdout(), "{}", termion::color::Fg(c.fg().as_termion())).unwrap();
+                }
+                write!(self.stdout(), "{}", c.ch()).unwrap();
+                if c.bg() != Color::Default {
+                    write!(
+                        self.stdout(),
+                        "{}",
+                        termion::color::Bg(termion::color::Reset)
+                    ).unwrap();
+                }
+                if c.fg() != Color::Default {
+                    write!(
+                        self.stdout(),
+                        "{}",
+                        termion::color::Fg(termion::color::Reset)
+                    ).unwrap();
+                }
+            }
+        }
+        self.flush();
+    }
+    pub fn render(&mut self) {
+        self.update_size();
+
+        /* draw each entity */
+        for i in 0..self.entities.len() {
+            self.draw_entity(i);
+        }
+        let cols = self.cols;
+        let rows = self.rows;
+
+        self.draw_area(((0, 0), (cols - 1, rows - 1)));
+    }
+    pub fn draw_entity(&mut self, idx: usize) {
+        let entity = &mut self.entities[idx];
+        let upper_left = (0, 0);
+        let bottom_right = (self.cols - 1, self.rows - 1);
+
+        if entity.component.is_dirty() {
+            entity.component.draw(
+                &mut self.grid,
+                (upper_left, bottom_right),
+                &mut self.context,
+            );
+        }
+    }
+    pub fn register_entity(&mut self, entity: Entity) {
+        self.entities.push(entity);
+    }
+    /// Convert user commands to actions/method calls.
+    fn parse_command(&mut self, cmd: String) {
+        let result = parse_command(&cmd.as_bytes()).to_full_result();
+
+        if let Ok(v) = result {
+            self.rcv_event(UIEvent { id: 0, event_type: UIEventType::Action(v) });
+        }
+    }
+
+    pub fn rcv_event(&mut self, event: UIEvent) {
+        match event.event_type {
+            // Command type is handled only by State.
+            UIEventType::Command(cmd) => {
+                self.parse_command(cmd);
+                return;
+            }
+            UIEventType::Fork(child) => {
+                self.mode = UIMode::Fork;
+                self.child = Some(child);
+                self.flush();
+                return;
+            }
+            UIEventType::EditDraft(mut file) => {
+                use std::io::Read;
+                use std::process::{Command, Stdio};
+                let mut output = Command::new("msmtp")
+                    .arg("-t")
+                    .stdin(Stdio::piped())
+                    .stdout(Stdio::piped())