aboutsummaryrefslogtreecommitdiff
path: root/helix-view/src/editor.rs
blob: 77cea7835dc6f1f4f68b148d489eb798c9112f1d (plain) (blame)
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
use crate::{
    clipboard::{get_clipboard_provider, ClipboardProvider},
    document::SCRATCH_BUFFER_NAME,
    graphics::{CursorKind, Rect},
    theme::{self, Theme},
    tree::{self, Tree},
    Document, DocumentId, View, ViewId,
};

use futures_util::future;
use std::{
    collections::BTreeMap,
    io::stdin,
    num::NonZeroUsize,
    path::{Path, PathBuf},
    pin::Pin,
    sync::Arc,
};

use tokio::time::{sleep, Duration, Instant, Sleep};

use anyhow::{bail, Context, Error};

pub use helix_core::diagnostic::Severity;
pub use helix_core::register::Registers;
use helix_core::syntax;
use helix_core::{Position, Selection};

use serde::Deserialize;

fn deserialize_duration_millis<'de, D>(deserializer: D) -> Result<Duration, D::Error>
where
    D: serde::Deserializer<'de>,
{
    let millis = u64::deserialize(deserializer)?;
    Ok(Duration::from_millis(millis))
}

#[derive(Debug, Clone, PartialEq, Deserialize)]
#[serde(rename_all = "kebab-case", default, deny_unknown_fields)]
pub struct FilePickerConfig {
    /// IgnoreOptions
    /// Enables ignoring hidden files.
    /// Whether to hide hidden files in file picker and global search results. Defaults to true.
    pub hidden: bool,
    /// Enables reading ignore files from parent directories. Defaults to true.
    pub parents: bool,
    /// Enables reading `.ignore` files.
    /// Whether to hide files listed in .ignore in file picker and global search results. Defaults to true.
    pub ignore: bool,
    /// Enables reading `.gitignore` files.
    /// Whether to hide files listed in .gitignore in file picker and global search results. Defaults to true.
    pub git_ignore: bool,
    /// Enables reading global .gitignore, whose path is specified in git's config: `core.excludefile` option.
    /// Whether to hide files listed in global .gitignore in file picker and global search results. Defaults to true.
    pub git_global: bool,
    /// Enables reading `.git/info/exclude` files.
    /// Whether to hide files listed in .git/info/exclude in file picker and global search results. Defaults to true.
    pub git_exclude: bool,
    /// WalkBuilder options
    /// Maximum Depth to recurse directories in file picker and global search. Defaults to `None`.
    pub max_depth: Option<usize>,
}

impl Default for FilePickerConfig {
    fn default() -> Self {
        Self {
            hidden: true,
            parents: true,
            ignore: true,
            git_ignore: true,
            git_global: true,
            git_exclude: true,
            max_depth: None,
        }
    }
}

#[derive(Debug, Clone, PartialEq, Deserialize)]
#[serde(rename_all = "kebab-case", default, deny_unknown_fields)]
pub struct Config {
    /// Padding to keep between the edge of the screen and the cursor when scrolling. Defaults to 5.
    pub scrolloff: usize,
    /// Number of lines to scroll at once. Defaults to 3
    pub scroll_lines: isize,
    /// Mouse support. Defaults to true.
    pub mouse: bool,
    /// Shell to use for shell commands. Defaults to ["cmd", "/C"] on Windows and ["sh", "-c"] otherwise.
    pub shell: Vec<String>,
    /// Line number mode.
    pub line_number: LineNumber,
    /// Middle click paste support. Defaults to true.
    pub middle_click_paste: bool,
    /// Smart case: Case insensitive searching unless pattern contains upper case characters. Defaults to true.
    pub smart_case: bool,
    /// Automatic insertion of pairs to parentheses, brackets, etc. Defaults to true.
    pub auto_pairs: bool,
    /// Automatic auto-completion, automatically pop up without user trigger. Defaults to true.
    pub auto_completion: bool,
    /// Time in milliseconds since last keypress before idle timers trigger. Used for autocompletion, set to 0 for instant. Defaults to 400ms.
    #[serde(skip_serializing, deserialize_with = "deserialize_duration_millis")]
    pub idle_timeout: Duration,
    pub completion_trigger_len: u8,
    /// Whether to display infoboxes. Defaults to true.
    pub auto_info: bool,
    pub file_picker: FilePickerConfig,
}

#[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
#[serde(rename_all = "kebab-case")]
pub enum LineNumber {
    /// Show absolute line number
    Absolute,

    /// Show relative line number to the primary cursor
    Relative,
}

impl Default for Config {
    fn default() -> Self {
        Self {
            scrolloff: 5,
            scroll_lines: 3,
            mouse: true,
            shell: if cfg!(windows) {
                vec!["cmd".to_owned(), "/C".to_owned()]
            } else {
                vec!["sh".to_owned(), "-c".to_owned()]
            },
            line_number: LineNumber::Absolute,
            middle_click_paste: true,
            smart_case: true,
            auto_pairs: true,
            auto_completion: true,
            idle_timeout: Duration::from_millis(400),
            completion_trigger_len: 2,
            auto_info: true,
            file_picker: FilePickerConfig::default(),
        }
    }
}

pub struct Motion(pub Box<dyn Fn(&mut Editor)>);
impl Motion {
    pub fn run(&self, e: &mut Editor) {
        (self.0)(e)
    }
}
impl std::fmt::Debug for Motion {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str("motion")
    }
}

#[derive(Debug)]
pub struct Editor {
    pub tree: Tree,
    pub next_document_id: DocumentId,
    pub documents: BTreeMap<DocumentId, Document>,
    pub count: Option<std::num::NonZeroUsize>,
    pub selected_register: Option<char>,
    pub registers: Registers,
    pub theme: Theme,
    pub language_servers: helix_lsp::Registry,
    pub clipboard_provider: Box<dyn ClipboardProvider>,

    pub syn_loader: Arc<syntax::Loader>,
    pub theme_loader: Arc<theme::Loader>,

    pub status_msg: Option<(String, Severity)>,

    pub config: Config,

    pub idle_timer: Pin<Box<Sleep>>,
    pub last_motion: Option<Motion>,

    pub exit_code: i32,
}

#[derive(Debug, Copy, Clone)]
pub enum Action {
    Load,
    Replace,
    HorizontalSplit,
    VerticalSplit,
}

impl Editor {
    pub fn new(
        mut area: Rect,
        theme_loader: Arc<theme::Loader>,
        syn_loader: Arc<syntax::Loader>,
        config: Config,
    ) -> Self {
        let language_servers = helix_lsp::Registry::new();

        // HAXX: offset the render area height by 1 to account for prompt/commandline
        area.height -= 1;

        Self {
            tree: Tree::new(area),
            next_document_id: DocumentId::default(),
            documents: BTreeMap::new(),
            count: None,
            selected_register: None,
            theme: theme_loader.default(),
            language_servers,
            syn_loader,
            theme_loader,
            registers: Registers::default(),
            clipboard_provider: get_clipboard_provider(),
            status_msg: None,
            idle_timer: Box::pin(sleep(config.idle_timeout)),
            last_motion: None,
            config,
            exit_code: 0,
        }
    }

    pub fn clear_idle_timer(&mut self) {
        // equivalent to internal Instant::far_future() (30 years)
        self.idle_timer
            .as_mut()
            .reset(Instant::now() + Duration::from_secs(86400 * 365 * 30));
    }

    pub fn reset_idle_timer(&mut self) {
        self.idle_timer
            .as_mut()
            .reset(Instant::now() + self.config.idle_timeout);
    }

    pub fn clear_status(&mut self) {
        self.status_msg = None;
    }

    pub fn set_status(&mut self, status: String) {
        self.status_msg = Some((status, Severity::Info));
    }

    pub fn set_error(&mut self, error: String) {
        self.status_msg = Some((error, Severity::Error));
    }

    pub fn set_theme(&mut self, theme: Theme) {
        // `ui.selection` is the only scope required to be able to render a theme.
        if theme.find_scope_index("ui.selection").is_none() {
            self.set_error("Invalid theme: `ui.selection` required".to_owned());
            return;
        }

        let scopes = theme.scopes();
        for config in self
            .syn_loader
            .language_configs_iter()
            .filter(|cfg| cfg.is_highlight_initialized())
        {
            config.reconfigure(scopes);
        }

        self.theme = theme;
        self._refresh();
    }

    pub fn set_theme_from_name(&mut self, theme: &str) -> anyhow::Result<()> {
        let theme = self
            .theme_loader
            .load(theme.as_ref())
            .with_context(|| format!("failed setting theme `{}`", theme))?;
        self.set_theme(theme);
        Ok(())
    }

    /// Refreshes the language server for a given document
    pub fn refresh_language_server(&mut self, doc_id: DocumentId) -> Option<()> {
        let doc = self.documents.get_mut(&doc_id)?;
        doc.detect_language(Some(&self.theme), &self.syn_loader);
        Self::launch_language_server(&mut self.language_servers, doc)
    }

    /// Launch a language server for a given document
    fn launch_language_server(ls: &mut helix_lsp::Registry, doc: &mut Document) -> Option<()> {
        // try to find a language server based on the language name
        let language_server = doc.language.as_ref().and_then(|language| {
            ls.get(language)
                .map_err(|e| {
                    log::error!(
                        "Failed to initialize the LSP for `{}` {{ {} }}",
                        language.scope(),
                        e
                    )
                })
                .ok()
        });
        if let Some(language_server) = language_server {
            // only spawn a new lang server if the servers aren't the same
            if Some(language_server.id()) != doc.language_server().map(|server| server.id()) {
                if let Some(language_server) = doc.language_server() {
                    tokio::spawn(language_server.text_document_did_close(doc.identifier()));
                }
                let language_id = doc
                    .language()
                    .and_then(|s| s.split('.').last()) // source.rust
                    .map(ToOwned::to_owned)
                    .unwrap_or_default();

                // TODO: this now races with on_init code if the init happens too quickly
                tokio::spawn(language_server.text_document_did_open(
                    doc.url().unwrap(),
                    doc.version(),
                    doc.text(),
                    language_id,
                ));

                doc.set_language_server(Some(language_server));
            }
        }
        Some(())
    }

    fn _refresh(&mut self) {
        for (view, _) in self.tree.views_mut() {
            let doc = &self.documents[&view.doc];
            view.ensure_cursor_in_view(doc, self.config.scrolloff)
        }
    }

    fn replace_document_in_view(&mut self, current_view: ViewId, doc_id: DocumentId) {
        let view = self.tree.get_mut(current_view);
        view.doc = doc_id;
        view.offset = Position::default();

        let doc = self.documents.get_mut(&doc_id).unwrap();

        // initialize selection for view
        doc.selections
            .entry(view.id)
            .or_insert_with(|| Selection::point(0));
        // TODO: reuse align_view
        let pos = doc
            .selection(view.id)
            .primary()
            .cursor(doc.text().slice(..));
        let line = doc.text().char_to_line(pos);
        view.offset.row = line.saturating_sub(view.inner_area().height as usize / 2);
    }

    pub fn switch(&mut self, id: DocumentId, action: Action) {
        use crate::tree::Layout;

        if !self.documents.contains_key(&id) {
            log::error!("cannot switch to document that does not exist (anymore)");
            return;
        }

        match action {
            Action::Replace => {
                let (view, doc) = current_ref!(self);
                // If the current view is an empty scratch buffer and is not displayed in any other views, delete it.
                // Boolean value is determined before the call to `view_mut` because the operation requires a borrow
                // of `self.tree`, which is mutably borrowed when `view_mut` is called.
                let remove_empty_scratch = !doc.is_modified()
                    // If the buffer has no path and is not modified, it is an empty scratch buffer.
                    && doc.path().is_none()
                    // If the buffer we are changing to is not this buffer
                    && id != doc.id
                    // Ensure the buffer is not displayed in any other splits.
                    && !self
                        .tree
                        .traverse()
                        .any(|(_, v)| v.doc == doc.id && v.id != view.id);
                let view = view_mut!(self);
                if remove_empty_scratch {
                    // Copy `doc.id` into a variable before calling `self.documents.remove`, which requires a mutable
                    // borrow, invalidating direct access to `doc.id`.
                    let id = doc.id;
                    self.documents.remove(&id);
                } else {
                    let jump = (view.doc, doc.selection(view.id).clone());
                    view.jumps.push(jump);
                    view.last_accessed_doc = Some(view.doc);
                }

                let view_id = view.id;
                self.replace_document_in_view(view_id, id);

                return;
            }
            Action::Load => {
                let view_id = view!(self).id;
                let doc = self.documents.get_mut(&id).unwrap();
                if doc.selections().is_empty() {
                    doc.selections.insert(view_id, Selection::point(0));
                }
                return;
            }
            Action::HorizontalSplit | Action::VerticalSplit => {
                let view = View::new(id);
                let view_id = self.tree.split(
                    view,
                    match action {
                        Action::HorizontalSplit => Layout::Horizontal,
                        Action::VerticalSplit => Layout::Vertical,
                        _ => unreachable!(),
                    },
                );
                // initialize selection for view
                let doc = self.documents.get_mut(&id).unwrap();
                doc.selections.insert(view_id, Selection::point(0));
            }
        }

        self._refresh();
    }

    /// Generate an id for a new document and register it.
    fn new_document(&mut self, mut doc: Document) -> DocumentId {
        let id = self.next_document_id;
        // Safety: adding 1 from 1 is fine, probably impossible to reach usize max
        self.next_document_id =
            DocumentId(unsafe { NonZeroUsize::new_unchecked(self.next_document_id.0.get() + 1) });
        doc.id = id;
        self.documents.insert(id, doc);
        id
    }

    fn new_file_from_document(&mut self, action: Action, doc: Document) -> DocumentId {
        let id = self.new_document(doc);
        self.switch(id, action);
        id
    }

    pub fn new_file(&mut self, action: Action) -> DocumentId {
        self.new_file_from_document(action, Document::default())
    }

    pub fn new_file_from_stdin(&mut self, action: Action) -> Result<DocumentId, Error> {
        let (rope, encoding) = crate::document::from_reader(&mut stdin(), None)?;
        Ok(self.new_file_from_document(action, Document::from(rope, Some(encoding))))
    }

    pub fn open(&mut self, path: PathBuf, action: Action) -> Result<DocumentId, Error> {
        let path = helix_core::path::get_canonicalized_path(&path)?;
        let id = self.document_by_path(&path).map(|doc| doc.id);

        let id = if let Some(id) = id {
            id
        } else {
            let mut doc = Document::open(&path, None, Some(&self.theme), Some(&self.syn_loader))?;

            let _ = Self::launch_language_server(&mut self.language_servers, &mut doc);

            self.new_document(doc)
        };

        self.switch(id, action);
        Ok(id)
    }

    pub fn close(&mut self, id: ViewId) {
        let view = self.tree.get(self.tree.focus);
        // remove selection
        self.documents
            .get_mut(&view.doc)
            .unwrap()
            .selections
            .remove(&id);

        self.tree.remove(id);
        self._refresh();
    }

    pub fn close_document(&mut self, doc_id: DocumentId, force: bool) -> anyhow::Result<()> {
        let doc = match self.documents.get(&doc_id) {
            Some(doc) => doc,
            None => bail!("document does not exist"),
        };

        if !force && doc.is_modified() {
            bail!(
                "buffer {:?} is modified",
                doc.relative_path()
                    .map(|path| path.to_string_lossy().to_string())
                    .unwrap_or_else(|| SCRATCH_BUFFER_NAME.into())
            );
        }

        if let Some(language_server) = doc.language_server() {
            tokio::spawn(language_server.text_document_did_close(doc.identifier()));
        }

        let views_to_close = self
            .tree
            .views()
            .filter_map(|(view, _focus)| {
                if view.doc == doc_id {
                    Some(view.id)
                } else {
                    None
                }
            })
            .collect::<Vec<_>>();

        for view_id in views_to_close {
            self.close(view_id);
        }

        self.documents.remove(&doc_id);

        // If the document we removed was visible in all views, we will have no more views. We don't
        // want to close the editor just for a simple buffer close, so we need to create a new view
        // containing either an existing document, or a brand new document.
        if self.tree.views().next().is_none() {
            let doc_id = self
                .documents
                .iter()
                .map(|(&doc_id, _)| doc_id)
                .next()
                .unwrap_or_else(|| self.new_document(Document::default()));
            let view = View::new(doc_id);
            let view_id = self.tree.insert(view);
            let doc = self.documents.get_mut(&doc_id).unwrap();
            doc.selections.insert(view_id, Selection::point(0));
        }

        self._refresh();

        Ok(())
    }

    pub fn resize(&mut self, area: Rect) {
        if self.tree.resize(area) {
            self._refresh();
        };
    }

    pub fn focus_next(&mut self) {
        self.tree.focus_next();
    }

    pub fn focus_right(&mut self) {
        self.tree.focus_direction(tree::Direction::Right);
    }

    pub fn focus_left(&mut self) {
        self.tree.focus_direction(tree::Direction::Left);
    }

    pub fn focus_up(&mut self) {
        self.tree.focus_direction(tree::Direction::Up);
    }

    pub fn focus_down(&mut self) {
        self.tree.focus_direction(tree::Direction::Down);
    }

    pub fn should_close(&self) -> bool {
        self.tree.is_empty()
    }

    pub fn ensure_cursor_in_view(&mut self, id: ViewId) {
        let view = self.tree.get_mut(id);
        let doc = &self.documents[&view.doc];
        view.ensure_cursor_in_view(doc, self.config.scrolloff)
    }

    #[inline]
    pub fn document(&self, id: DocumentId) -> Option<&Document> {
        self.documents.get(&id)
    }

    #[inline]
    pub fn document_mut(&mut self, id: DocumentId) -> Option<&mut Document> {
        self.documents.get_mut(&id)
    }

    #[inline]
    pub fn documents(&self) -> impl Iterator<Item = &Document> {
        self.documents.values()
    }

    #[inline]
    pub fn documents_mut(&mut self) -> impl Iterator<Item = &mut Document> {
        self.documents.values_mut()
    }

    pub fn document_by_path<P: AsRef<Path>>(&self, path: P) -> Option<&Document> {
        self.documents()
            .find(|doc| doc.path().map(|p| p == path.as_ref()).unwrap_or(false))
    }

    pub fn document_by_path_mut<P: AsRef<Path>>(&mut self, path: P) -> Option<&mut Document> {
        self.documents_mut()
            .find(|doc| doc.path().map(|p| p == path.as_ref()).unwrap_or(false))
    }

    pub fn cursor(&self) -> (Option<Position>, CursorKind) {
        let (view, doc) = current_ref!(self);
        let cursor = doc
            .selection(view.id)
            .primary()
            .cursor(doc.text().slice(..));
        if let Some(mut pos) = view.screen_coords_at_pos(doc, doc.text().slice(..), cursor) {
            let inner = view.inner_area();
            pos.col += inner.x as usize;
            pos.row += inner.y as usize;
            (Some(pos), CursorKind::Hidden)
        } else {
            (None, CursorKind::Hidden)
        }
    }

    /// Closes language servers with timeout. The default timeout is 500 ms, use
    /// `timeout` parameter to override this.
    pub async fn close_language_servers(
        &self,
        timeout: Option<u64>,
    ) -> Result<(), tokio::time::error::Elapsed> {
        tokio::time::timeout(
            Duration::from_millis(timeout.unwrap_or(500)),
            future::join_all(
                self.language_servers
                    .iter_clients()
                    .map(|client| client.force_shutdown()),
            ),
        )
        .await
        .map(|_| ())
    }
}