1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
//! # Cursive
//!
//! [Cursive](https://github.com/gyscos/Cursive) is a TUI library built on top
//! of ncurses-rs.
//! It allows to easily build layouts for text-based applications.
//!
//! ## Getting started
//!
//! * Every application should start with a [`Cursive`](struct.Cursive.html)
//!   object. It is the main entry-point to the library.
//! * A declarative phase then describes the structure of the UI by adding
//!   views and configuring their behaviours.
//! * Finally, the event loop is started by calling
//!   [`Cursive::run(&mut self)`](struct.Cursive.html#method.run).
//!
//! ## Views
//!
//! Views are the main components of a cursive interface.
//! The [`views`](./views/index.html) module contains many views to use in your
//! application; if you don't find what you need, you may also implement the
//! [`View`](view/trait.View.html) trait and build your own.
//!
//! ## Callbacks
//!
//! Cursive is a *reactive* UI: it *reacts* to events generated by user input.
//!
//! During the declarative phase, callbacks are set to trigger on specific
//! events. These functions usually take a `&mut Cursive` argument, allowing
//! them to modify the view tree at will.
//!
//! ## Examples
//!
//! ```no_run
//! extern crate cursive;
//!
//! use cursive::Cursive;
//! use cursive::views::TextView;
//!
//! fn main() {
//!     let mut siv = Cursive::new();
//!
//!     siv.add_layer(TextView::new("Hello World!\nPress q to quit."));
//!
//!     siv.add_global_callback('q', |s| s.quit());
//!
//!     siv.run();
//! }
//! ```
//!
//! ## Debugging
//!
//! The `Cursive` root initializes the terminal on creation, and do cleanups
//! on drop. While it is alive, printing to the terminal will not work
//! as expected, making debugging a bit harder.
//!
//! One solution is to redirect stderr to a file when running the application,
//! and log to it instead of stdout.
//!
//! Or you can use gdb as usual.
#![deny(missing_docs)]

extern crate toml;
extern crate unicode_segmentation;
extern crate unicode_width;
extern crate odds;
extern crate num;
extern crate owning_ref;

#[cfg(feature = "termion")]
#[macro_use]
extern crate chan;


macro_rules! println_stderr(
    ($($arg:tt)*) => { {
        use ::std::io::Write;
        let r = writeln!(&mut ::std::io::stderr(), $($arg)*);
        r.expect("failed printing to stderr");
    } }
);

macro_rules! new_default(
    ($c:ty) => {
        impl Default for $c {
            fn default() -> Self {
                Self::new()
            }
        }
    }
);

pub mod traits;

pub mod event;
#[macro_use]
pub mod view;

pub mod views;
pub mod vec;
pub mod theme;
pub mod align;
pub mod menu;
pub mod direction;
pub mod utils;

// This probably doesn't need to be public?
mod printer;
mod xy;
mod with;

mod div;
mod utf8;

#[doc(hidden)]
pub mod backend;


use backend::Backend;

use event::{Callback, Event, EventResult};

pub use printer::Printer;

use std::any::Any;
use std::collections::HashMap;
use std::path::Path;

use std::sync::mpsc;

use vec::Vec2;
use view::Finder;
use view::View;
pub use with::With;
pub use xy::XY;


/// Identifies a screen in the cursive root.
pub type ScreenId = usize;

/// Central part of the cursive library.
///
/// It initializes ncurses on creation and cleans up on drop.
/// To use it, you should populate it with views, layouts and callbacks,
/// then start the event loop with run().
///
/// It uses a list of screen, with one screen active at a time.
pub struct Cursive {
    theme: theme::Theme,
    screens: Vec<views::StackView>,
    global_callbacks: HashMap<Event, Callback>,
    menubar: views::Menubar,

    // Last layer sizes of the stack view.
    // If it changed, clear the screen.
    last_sizes: Vec<Vec2>,

    active_screen: ScreenId,

    running: bool,

    backend: backend::Concrete,

    cb_source: mpsc::Receiver<Box<Fn(&mut Cursive) + Send>>,
    cb_sink: mpsc::Sender<Box<Fn(&mut Cursive) + Send>>,
}

new_default!(Cursive);

impl Cursive {
    /// Creates a new Cursive root, and initialize the back-end.
    pub fn new() -> Self {
        let mut backend = backend::Concrete::init();

        let theme = theme::load_default();
        theme.activate(&mut backend);
        // let theme = theme::load_theme("assets/style.toml").unwrap();

        let (tx, rx) = mpsc::channel();

        let mut res = Cursive {
            theme: theme,
            screens: Vec::new(),
            last_sizes: Vec::new(),
            global_callbacks: HashMap::new(),
            menubar: views::Menubar::new(),
            active_screen: 0,
            running: true,
            cb_source: rx,
            cb_sink: tx,
            backend: backend,
        };

        res.screens.push(views::StackView::new());

        res
    }

    /// Returns a sink for asynchronous callbacks.
    ///
    /// Returns the sender part of a channel, that allows to send
    /// callbacks to `self` from other threads.
    ///
    /// Callbacks will be executed in the order
    /// of arrival on the next event cycle.
    ///
    /// Note that you currently need to call [`set_fps`] to force cursive to
    /// regularly check for messages.
    ///
    /// [`set_fps`]: #method.set_fps
    pub fn cb_sink(&self) -> &mpsc::Sender<Box<Fn(&mut Cursive) + Send>> {
        &self.cb_sink
    }

    /// Selects the menubar.
    pub fn select_menubar(&mut self) {
        self.menubar.take_focus(direction::Direction::none());
    }

    /// Sets the menubar autohide feature.
    ///
    /// * When enabled (default), the menu is only visible when selected.
    /// * When disabled, the menu is always visible and reserves the top row.
    pub fn set_autohide_menu(&mut self, autohide: bool) {
        self.menubar.autohide = autohide;
    }

    /// Access the menu tree used by the menubar.
    ///
    /// This allows to add menu items to the menubar.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # extern crate cursive;
    /// #
    /// # use cursive::{Cursive, event};
    /// # use cursive::views::{Dialog};
    /// # use cursive::traits::*;
    /// # use cursive::menu::*;
    /// #
    /// # fn main() {
    /// let mut siv = Cursive::new();
    ///
    /// siv.menubar()
    ///    .add_subtree("File",
    ///         MenuTree::new()
    ///             .leaf("New", |s| s.add_layer(Dialog::info("New file!")))
    ///             .subtree("Recent", MenuTree::new().with(|tree| {
    ///                 for i in 1..100 {
    ///                     tree.add_leaf(format!("Item {}", i), |_| ())
    ///                 }
    ///             }))
    ///             .delimiter()
    ///             .with(|tree| {
    ///                 for i in 1..10 {
    ///                     tree.add_leaf(format!("Option {}", i), |_| ());
    ///                 }
    ///             })
    ///             .delimiter()
    ///             .leaf("Quit", |s| s.quit()))
    ///    .add_subtree("Help",
    ///         MenuTree::new()
    ///             .subtree("Help",
    ///                      MenuTree::new()
    ///                          .leaf("General", |s| {
    ///                              s.add_layer(Dialog::info("Help message!"))
    ///                          })
    ///                          .leaf("Online", |s| {
    ///                              s.add_layer(Dialog::info("Online help?"))
    ///                          }))
    ///             .leaf("About",
    ///                   |s| s.add_layer(Dialog::info("Cursive v0.0.0"))));
    ///
    /// siv.add_global_callback(event::Key::Esc, |s| s.select_menubar());
    /// # }
    /// ```
    pub fn menubar(&mut self) -> &mut views::Menubar {
        &mut self.menubar
    }

    /// Returns the currently used theme.
    pub fn current_theme(&self) -> &theme::Theme {
        &self.theme
    }

    /// Sets the current theme.
    pub fn set_theme(&mut self, theme: theme::Theme) {
        self.theme = theme;
        self.theme.activate(&mut self.backend);
        self.backend.clear();
    }

    /// Clears the screen.
    ///
    /// Users rarely have to call this directly.
    pub fn clear(&self) {
        self.backend.clear();
    }

    /// Loads a theme from the given file.
    ///
    /// `filename` must point to a valid toml file.
    pub fn load_theme_file<P: AsRef<Path>>(&mut self, filename: P)
                                           -> Result<(), theme::Error> {
        self.set_theme(try!(theme::load_theme_file(filename)));
        Ok(())
    }

    /// Loads a theme from the given string content.
    ///
    /// Content must be valid toml.
    pub fn load_theme(&mut self, content: &str) -> Result<(), theme::Error> {
        self.set_theme(try!(theme::load_theme(content)));
        Ok(())
    }

    /// Sets the refresh rate, in frames per second.
    ///
    /// Regularly redraws everything, even when no input is given.
    ///
    /// You currently need this to regularly check
    /// for events sent using [`cb_sink`].
    ///
    /// Between 0 and 1000. Call with `fps = 0` to disable (default value).
    ///
    /// [`cb_sink`]: #method.cb_sink
    pub fn set_fps(&mut self, fps: u32) {
        self.backend.set_refresh_rate(fps)
    }

    /// Returns a reference to the currently active screen.
    pub fn screen(&self) -> &views::StackView {
        let id = self.active_screen;
        &self.screens[id]
    }

    /// Returns a mutable reference to the currently active screen.
    pub fn screen_mut(&mut self) -> &mut views::StackView {
        let id = self.active_screen;
        &mut self.screens[id]
    }

    /// Adds a new screen, and returns its ID.
    pub fn add_screen(&mut self) -> ScreenId {
        let res = self.screens.len();
        self.screens.push(views::StackView::new());
        res
    }

    /// Convenient method to create a new screen, and set it as active.
    pub fn add_active_screen(&mut self) -> ScreenId {
        let res = self.add_screen();
        self.set_screen(res);
        res
    }

    /// Sets the active screen. Panics if no such screen exist.
    pub fn set_screen(&mut self, screen_id: ScreenId) {
        if screen_id >= self.screens.len() {
            panic!("Tried to set an invalid screen ID: {}, but only {} \
                    screens present.",
                   screen_id,
                   self.screens.len());
        }
        self.active_screen = screen_id;
    }

    /// Tries to find the view pointed to by the given selector.
    ///
    /// Runs a closure on the view once it's found, and return the
    /// result.
    ///
    /// If the view is not found, or if it is not of the asked type,
    /// returns None.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # extern crate cursive;
    /// # use cursive::{Cursive, views, view};
    /// # use cursive::traits::*;
    /// # fn main() {
    /// let mut siv = Cursive::new();
    ///
    /// siv.add_layer(views::TextView::new("Text #1")
    ///                               .with_id("text"));
    ///
    /// siv.add_global_callback('p', |s| {
    ///     s.call_on(&view::Selector::Id("text"), |view: &mut views::TextView| {
    ///         view.set_content("Text #2");
    ///     });
    /// });
    /// # }
    /// ```
    pub fn call_on<V, F, R>(&mut self, sel: &view::Selector, callback: F)
                         -> Option<R>
        where V: View + Any,
              F: FnOnce(&mut V) -> R
    {
        self.screen_mut().call_on(sel, callback)
    }

    /// Tries to find the view identified by the given id.
    ///
    /// Convenient method to use `call_on` with a `view::Selector::Id`.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # extern crate cursive;
    /// # use cursive::{Cursive, views};
    /// # use cursive::traits::*;
    /// # fn main() {
    /// let mut siv = Cursive::new();
    ///
    /// siv.add_layer(views::TextView::new("Text #1")
    ///                               .with_id("text"));
    ///
    /// siv.add_global_callback('p', |s| {
    ///     s.call_on_id("text", |view: &mut views::TextView| {
    ///         view.set_content("Text #2");
    ///     });
    /// });
    /// # }
    /// ```
    pub fn call_on_id<V, F, R>(&mut self, id: &str, callback: F) -> Option<R>
        where V: View + Any,
              F: FnOnce(&mut V) -> R
    {
        self.call_on(&view::Selector::Id(id), callback)
    }

    /// Convenient method to find a view wrapped in [`IdView`].
    ///
    /// This looks for a `IdView<V>` with the given ID, and return
    /// a mutable reference to the wrapped view.
    ///
    /// [`IdView`]: views/struct.IdView.html
    pub fn find_id<V>(&mut self, id: &str) -> Option<views::ViewRef<V>>
        where V: View + Any
    {
        self.call_on_id(id, views::IdView::<V>::get_mut)
    }

    /// Moves the focus to the view identified by `id`.
    ///
    /// Convenient method to call `focus` with a `view::Selector::Id`.
    pub fn focus_id(&mut self, id: &str) -> Result<(), ()> {
        self.focus(&view::Selector::Id(id))
    }

    /// Moves the focus to the view identified by `sel`.
    pub fn focus(&mut self, sel: &view::Selector) -> Result<(), ()> {
        self.screen_mut().focus_view(sel)
    }

    /// Adds a global callback.
    ///
    /// Will be triggered on the given key press when no view catches it.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # extern crate cursive;
    /// # use cursive::*;
    /// # fn main() {
    /// let mut siv = Cursive::new();
    ///
    /// siv.add_global_callback('q', |s| s.quit());
    /// # }
    /// ```
    pub fn add_global_callback<F, E: Into<Event>>(&mut self, event: E, cb: F)
        where F: Fn(&mut Cursive) + 'static
    {
        self.global_callbacks.insert(event.into(), Callback::from_fn(cb));
    }

    /// Add a layer to the current screen.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # extern crate cursive;
    /// # use cursive::*;
    /// # fn main() {
    /// let mut siv = Cursive::new();
    ///
    /// siv.add_layer(views::TextView::new("Hello world!"));
    /// # }
    /// ```
    pub fn add_layer<T: 'static + View>(&mut self, view: T) {
        self.screen_mut().add_layer(view);
    }

    /// Adds a new full-screen layer to the current screen.
    ///
    /// Fullscreen layers have no shadow.
    pub fn add_fullscreen_layer<T>(&mut self, view: T)
        where T: 'static + View
    {
        self.screen_mut().add_fullscreen_layer(view);
    }

    /// Convenient method to remove a layer from the current screen.
    pub fn pop_layer(&mut self) {
        self.screen_mut().pop_layer();
        self.clear();
    }

    // Handles a key event when it was ignored by the current view
    fn on_event(&mut self, event: Event) {
        let cb = match self.global_callbacks.get(&event) {
            None => return,
            Some(cb) => cb.clone(),
        };
        // Not from a view, so no viewpath here
        cb(self);
    }

    /// Returns the size of the screen, in characters.
    pub fn screen_size(&self) -> Vec2 {
        let (x, y) = self.backend.screen_size();

        Vec2 {
            x: x as usize,
            y: y as usize,
        }
    }

    fn layout(&mut self) {
        let size = self.screen_size();
        self.screen_mut().layout(size);
    }

    fn draw(&mut self) {
        // TODO: don't clone the theme
        // Reference it or something

        let sizes = self.screen().layer_sizes();
        if &self.last_sizes != &sizes {
            self.clear();
            self.last_sizes = sizes;
        }

        let printer = Printer::new(self.screen_size(),
                                   self.theme.clone(),
                                   &self.backend);

        // Draw the currently active screen
        // If the menubar is active, nothing else can be.
        let offset = if self.menubar.autohide { 0 } else { 1 };
        // Draw the menubar?
        if self.menubar.visible() {
            let printer = printer.sub_printer(Vec2::zero(),
                                              printer.size,
                                              self.menubar.receive_events());
            self.menubar.draw(&printer);
        }

        let selected = self.menubar.receive_events();

        let printer =
            printer.sub_printer(Vec2::new(0, offset), printer.size, !selected);
        let id = self.active_screen;
        self.screens[id].draw(&printer);

    }

    /// Returns `true` until [`quit(&mut self)`] is called.
    ///
    /// [`quit(&mut self)`]: #method.quit
    pub fn is_running(&self) -> bool {
        self.running
    }


    /// Runs the event loop.
    ///
    /// It will wait for user input (key presses)
    /// and trigger callbacks accordingly.
    ///
    /// Calls [`step(&mut self)`] until [`quit(&mut self)`] is called.
    ///
    /// [`step(&mut self)`]: #method.step
    /// [`quit(&mut self)`]: #method.quit
    pub fn run(&mut self) {

        // And the big event loop begins!
        while self.running {
            self.step();
        }
    }

    /// Performs a single step from the event loop.
    ///
    /// Useful if you need tighter control on the event loop.
    /// Otherwise, [`run(&mut self)`] might be more convenient.
    ///
    /// [`run(&mut self)`]: #method.run
    pub fn step(&mut self) {
        if let Ok(cb) = self.cb_source.try_recv() {
            cb(self);
        }

        // Do we need to redraw everytime?
        // Probably, actually.
        // TODO: Do we need to re-layout everytime?
        self.layout();

        // TODO: Do we need to redraw every view every time?
        // (Is this getting repetitive? :p)
        self.draw();
        self.backend.refresh();

        // Wait for next event.
        // (If set_fps was called, this returns -1 now and then)
        let event = self.backend.poll_event();
        if event == Event::Exit {
            self.quit();
        }

        if event == Event::WindowResize {
            self.backend.clear();
        }

        // Event dispatch order:
        // * Focused element:
        //     * Menubar (if active)
        //     * Current screen (top layer)
        // * Global callbacks
        if self.menubar.receive_events() {
            self.menubar.on_event(event).process(self);
        } else {
            match self.screen_mut().on_event(event.clone()) {
                // If the event was ignored,
                // it is our turn to play with it.
                EventResult::Ignored => self.on_event(event),
                EventResult::Consumed(None) => (),
                EventResult::Consumed(Some(cb)) => cb(self),
            }
        }
    }

    /// Stops the event loop.
    pub fn quit(&mut self) {
        self.running = false;
    }
}

impl Drop for Cursive {
    fn drop(&mut self) {
        self.backend.finish();
    }
}