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use std::io;
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use std::io::Write;
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use std::collections::HashMap;
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use termion;
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use termion::raw::{IntoRawMode, RawTerminal};
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use rustbox;
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use buffer::{Buffer, Cell};
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use layout::{Rect, Group, split};
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use widgets::Widget;
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use style::{Color, Modifier, Style};
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pub trait Backend {
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fn draw<'a, I>(&mut self, content: I) -> Result<(), io::Error>
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where I: Iterator<Item = (u16, u16, &'a Cell)>;
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fn hide_cursor(&mut self) -> Result<(), io::Error>;
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fn show_cursor(&mut self) -> Result<(), io::Error>;
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fn clear(&mut self) -> Result<(), io::Error>;
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fn size(&self) -> Result<Rect, io::Error>;
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fn flush(&mut self) -> Result<(), io::Error>;
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}
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pub struct TermionBackend {
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stdout: RawTerminal<io::Stdout>,
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}
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impl TermionBackend {
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pub fn new() -> Result<TermionBackend, io::Error> {
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let stdout = try!(io::stdout().into_raw_mode());
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Ok(TermionBackend { stdout: stdout })
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}
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}
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impl Backend for TermionBackend {
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/// Clears the entire screen and move the cursor to the top left of the screen
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fn clear(&mut self) -> Result<(), io::Error> {
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try!(write!(self.stdout, "{}", termion::clear::All));
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try!(write!(self.stdout, "{}", termion::cursor::Goto(1, 1)));
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try!(self.stdout.flush());
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Ok(())
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}
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/// Hides cursor
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fn hide_cursor(&mut self) -> Result<(), io::Error> {
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try!(write!(self.stdout, "{}", termion::cursor::Hide));
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try!(self.stdout.flush());
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Ok(())
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}
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/// Shows cursor
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fn show_cursor(&mut self) -> Result<(), io::Error> {
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try!(write!(self.stdout, "{}", termion::cursor::Show));
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try!(self.stdout.flush());
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Ok(())
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}
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fn draw<'a, I>(&mut self, content: I) -> Result<(), io::Error>
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where I: Iterator<Item = (u16, u16, &'a Cell)>
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{
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let mut string = String::with_capacity(content.size_hint().0 * 3);
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let mut style = Style::default();
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let mut last_y = 0;
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let mut last_x = 0;
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let mut inst = 0;
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for (x, y, cell) in content {
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if y != last_y || x != last_x + 1 {
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string.push_str(&format!("{}", termion::cursor::Goto(x + 1, y + 1)));
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inst += 1;
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}
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last_x = x;
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last_y = y;
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if cell.style.modifier != style.modifier {
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string.push_str(&cell.style.modifier.termion_modifier());
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style.modifier = cell.style.modifier;
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if style.modifier == Modifier::Reset {
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style.bg = Color::Reset;
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style.fg = Color::Reset;
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}
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inst += 1;
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}
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if cell.style.fg != style.fg {
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string.push_str(&cell.style.fg.termion_fg());
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style.fg = cell.style.fg;
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inst += 1;
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}
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if cell.style.bg != style.bg {
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string.push_str(&cell.style.bg.termion_bg());
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style.bg = cell.style.bg;
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inst += 1;
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}
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string.push_str(&cell.symbol);
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inst += 1;
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}
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debug!("{} instructions outputed.", inst);
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try!(write!(self.stdout,
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"{}{}{}{}",
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string,
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Color::Reset.termion_fg(),
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Color::Reset.termion_bg(),
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Modifier::Reset.termion_modifier()));
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Ok(())
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}
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/// Return the size of the terminal
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fn size(&self) -> Result<Rect, io::Error> {
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let terminal = try!(termion::terminal_size());
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Ok(Rect {
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x: 0,
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y: 0,
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width: terminal.0,
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height: terminal.1,
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})
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}
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fn flush(&mut self) -> Result<(), io::Error> {
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try!(self.stdout.flush());
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Ok(())
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}
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}
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pub struct RustboxBackend {
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rustbox: rustbox::RustBox,
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}
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impl RustboxBackend {
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pub fn new() -> Result<RustboxBackend, rustbox::InitError> {
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let rustbox = try!(rustbox::RustBox::init(Default::default()));
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Ok(RustboxBackend { rustbox: rustbox })
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}
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pub fn with_rustbox(instance: rustbox::RustBox) -> RustboxBackend {
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RustboxBackend { rustbox: instance }
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}
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pub fn rustbox(&self) -> &rustbox::RustBox {
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&self.rustbox
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}
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}
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impl Backend for RustboxBackend {
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fn draw<'a, I>(&mut self, content: I) -> Result<(), io::Error>
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where I: Iterator<Item = (u16, u16, &'a Cell)>
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{
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let mut inst = 0;
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for (x, y, cell) in content {
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inst += 1;
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self.rustbox.print(x as usize,
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y as usize,
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cell.style.modifier.into(),
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cell.style.fg.into(),
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cell.style.bg.into(),
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&cell.symbol);
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}
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debug!("{} instructions outputed", inst);
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Ok(())
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}
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fn hide_cursor(&mut self) -> Result<(), io::Error> {
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Ok(())
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}
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fn show_cursor(&mut self) -> Result<(), io::Error> {
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Ok(())
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}
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fn clear(&mut self) -> Result<(), io::Error> {
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self.rustbox.clear();
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Ok(())
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}
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fn size(&self) -> Result<Rect, io::Error> {
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Ok((Rect {
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x: 0,
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y: 0,
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width: self.rustbox.width() as u16,
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height: self.rustbox.height() as u16,
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}))
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}
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fn flush(&mut self) -> Result<(), io::Error> {
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self.rustbox.present();
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Ok(())
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}
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}
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/// Holds a computed layout and keeps track of its use between successive draw calls
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#[derive(Debug)]
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pub struct LayoutEntry {
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chunks: Vec<Rect>,
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hot: bool,
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}
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/// Interface to the terminal backed by Termion
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pub struct Terminal<B>
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where B: Backend
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{
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backend: B,
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/// Cache to prevent the layout to be computed at each draw call
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layout_cache: HashMap<(Group, Rect), LayoutEntry>,
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/// Holds the results of the current and previous draw calls. The two are compared at the end
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/// of each draw pass to output the necessary updates to the terminal
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buffers: [Buffer; 2],
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/// Index of the current buffer in the previous array
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current: usize,
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}
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impl<B> Terminal<B>
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where B: Backend
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{
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/// Wrapper around Termion initialization. Each buffer is initialized with a blank string and
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/// default colors for the foreground and the background
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pub fn new(backend: B) -> Result<Terminal<B>, io::Error> {
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let size = try!(backend.size());
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Ok(Terminal {
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backend: backend,
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layout_cache: HashMap::new(),
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buffers: [Buffer::empty(size), Buffer::empty(size)],
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current: 0,
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})
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}
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pub fn backend(&self) -> &B {
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&self.backend
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}
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pub fn backend_mut(&mut self) -> &mut B {
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&mut self.backend
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}
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/// Check if we have already computed a layout for a given group, otherwise it creates one and
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/// add it to the layout cache. Moreover the function marks the queried entries so that we can
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/// clean outdated ones at the end of the draw call.
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pub fn compute_layout(&mut self, group: &Group, area: &Rect) -> Vec<Rect> {
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let entry = self.layout_cache
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.entry((group.clone(), *area))
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.or_insert_with(|| {
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let chunks = split(area, &group.direction, group.margin, &group.sizes);
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debug!("New layout computed:\n* Group = {:?}\n* Chunks = {:?}",
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group,
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chunks);
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LayoutEntry {
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chunks: chunks,
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hot: true,
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}
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});
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entry.hot = true;
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entry.chunks.clone()
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}
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/// Builds a string representing the minimal escape sequences and characters set necessary to
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/// update the UI and writes it to stdout.
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pub fn flush(&mut self) -> Result<(), io::Error> {
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let width = self.buffers[self.current].area.width;
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let content = self.buffers[self.current]
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.content
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.iter()
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.zip(self.buffers[1 - self.current].content.iter())
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.enumerate()
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.filter_map(|(i, (c, p))| if c != p {
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let i = i as u16;
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let x = i % width;
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let y = i / width;
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Some((x, y, c))
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} else {
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None
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});
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self.backend.draw(content)
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}
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/// Calls the draw method of a given widget on the current buffer
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pub fn render<W>(&mut self, widget: &W, area: &Rect)
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where W: Widget
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{
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widget.draw(area, &mut self.buffers[self.current]);
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}
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/// Updates the interface so that internal buffers matches the current size of the terminal.
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/// This leads to a full redraw of the screen.
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pub fn resize(&mut self, area: Rect) -> Result<(), io::Error> {
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self.buffers[self.current].resize(area);
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self.buffers[1 - self.current].resize(area);
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self.buffers[1 - self.current].reset();
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self.layout_cache.clear();
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try!(self.backend.clear());
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Ok(())
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}
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/// Flushes the current internal state and prepares the interface for the next draw call
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pub fn draw(&mut self) -> Result<(), io::Error> {
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// Draw to stdout
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try!(self.flush());
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// Clean layout cache
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let hot = self.layout_cache
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.drain()
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.filter(|&(_, ref v)| v.hot)
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.collect::<Vec<((Group, Rect), LayoutEntry)>>();
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for (key, value) in hot {
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self.layout_cache.insert(key, value);
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}
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for (_, e) in &mut self.layout_cache {
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e.hot = false;
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}
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// Swap buffers
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self.buffers[1 - self.current].reset();
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self.current = 1 - self.current;
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// Flush
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try!(self.backend.flush());
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Ok(())
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}
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pub fn hide_cursor(&mut self) -> Result<(), io::Error> {
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self.backend.hide_cursor()
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}
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pub fn show_cursor(&mut self) -> Result<(), io::Error> {
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self.backend.show_cursor()
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}
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pub fn clear(&mut self) -> Result<(), io::Error> {
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self.backend.clear()
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}
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pub fn size(&self) -> Result<Rect, io::Error> {
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self.backend.size()
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}
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}
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