aboutsummaryrefslogtreecommitdiff
path: root/helix-view/src/editor.rs
blob: 33e380a04c65fd09880d884b163ad6e6393083ae (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
use crate::{theme::Theme, tree::Tree, Document, DocumentId, View, ViewId};
use tui::layout::Rect;

use std::path::PathBuf;

use slotmap::SlotMap;

use anyhow::Error;

pub struct Editor {
    pub tree: Tree,
    pub documents: SlotMap<DocumentId, Document>,
    pub count: Option<usize>,
    pub theme: Theme,
    pub language_servers: helix_lsp::Registry,
    pub executor: &'static smol::Executor<'static>,
}

pub enum Action {
    Replace,
    HorizontalSplit,
    VerticalSplit,
}

impl Editor {
    pub fn new(executor: &'static smol::Executor<'static>, mut area: tui::layout::Rect) -> Self {
        let theme = Theme::default();
        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),
            documents: SlotMap::with_key(),
            count: None,
            theme,
            language_servers,
            executor,
        }
    }

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

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

        let id = if let Some(id) = id {
            id
        } else {
            let mut doc = Document::load(path, self.theme.scopes())?;

            // try to find a language server based on the language name
            let language_server = doc
                .language
                .as_ref()
                .and_then(|language| self.language_servers.get(language, self.executor));

            if let Some(language_server) = language_server {
                doc.set_language_server(Some(language_server.clone()));

                let language_id = doc
                    .language()
                    .and_then(|s| s.split('.').last()) // source.rust
                    .map(ToOwned::to_owned)
                    .unwrap_or_default();

                smol::block_on(language_server.text_document_did_open(
                    doc.url().unwrap(),
                    doc.version(),
                    doc.text(),
                    language_id,
                ))
                .unwrap();
            }

            let id = self.documents.insert(doc);
            self.documents[id].id = id;
            id
        };

        use crate::tree::Layout;
        match action {
            Action::Replace => {
                let view = self.view_mut();
                view.doc = id;
                view.first_line = 0;
                return Ok(id);
            }
            Action::HorizontalSplit => {
                let view = View::new(id)?;
                self.tree.split(view, Layout::Horizontal);
            }
            Action::VerticalSplit => {
                let view = View::new(id)?;
                self.tree.split(view, Layout::Vertical);
            }
        }

        self._refresh();

        Ok(id)
    }

    pub fn close(&mut self, id: ViewId) {
        let view = self.tree.get(self.tree.focus);
        // get around borrowck issues
        let language_servers = &mut self.language_servers;
        let executor = self.executor;

        let doc = &self.documents[view.doc];

        let language_server = doc
            .language
            .as_ref()
            .and_then(|language| language_servers.get(language, executor));

        if let Some(language_server) = language_server {
            smol::block_on(language_server.text_document_did_close(doc.identifier())).unwrap();
        }

        // self.documents.remove(view.doc);
        self.tree.remove(id);
        self._refresh();
    }

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

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

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

    pub fn view(&self) -> &View {
        self.tree.get(self.tree.focus)
    }

    pub fn view_mut(&mut self) -> &mut View {
        self.tree.get_mut(self.tree.focus)
    }

    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)
    }

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

    pub fn documents(&self) -> impl Iterator<Item = &Document> {
        self.documents.iter().map(|(_id, doc)| doc)
    }

    pub fn cursor_position(&self) -> Option<helix_core::Position> {
        const OFFSET: u16 = 7; // 1 diagnostic + 5 linenr + 1 gutter
        let view = self.view();
        let doc = &self.documents[view.doc];
        let cursor = doc.selection().cursor();
        if let Some(mut pos) = view.screen_coords_at_pos(doc, doc.text().slice(..), cursor) {
            pos.col += view.area.x as usize + OFFSET as usize;
            pos.row += view.area.y as usize;
            return Some(pos);
        }
        None
    }
}