1mod active_buffer_language;
2
3pub use active_buffer_language::ActiveBufferLanguage;
4use anyhow::Context as _;
5use editor::Editor;
6use file_finder::file_finder_settings::FileFinderSettings;
7use file_icons::FileIcons;
8use fuzzy::{StringMatch, StringMatchCandidate, match_strings};
9use gpui::{
10 App, Context, DismissEvent, Entity, EventEmitter, FocusHandle, Focusable, ParentElement,
11 Render, Styled, WeakEntity, Window, actions,
12};
13use language::{Buffer, LanguageMatcher, LanguageName, LanguageRegistry};
14use picker::{Picker, PickerDelegate};
15use project::Project;
16use settings::Settings;
17use std::{ops::Not as _, path::Path, sync::Arc};
18use ui::{HighlightedLabel, ListItem, ListItemSpacing, prelude::*};
19use util::ResultExt;
20use workspace::{ModalView, Workspace};
21
22actions!(
23 language_selector,
24 [
25 /// Toggles the language selector modal.
26 Toggle
27 ]
28);
29
30pub fn init(cx: &mut App) {
31 cx.observe_new(LanguageSelector::register).detach();
32}
33
34pub struct LanguageSelector {
35 picker: Entity<Picker<LanguageSelectorDelegate>>,
36}
37
38impl LanguageSelector {
39 fn register(
40 workspace: &mut Workspace,
41 _window: Option<&mut Window>,
42 _: &mut Context<Workspace>,
43 ) {
44 workspace.register_action(move |workspace, _: &Toggle, window, cx| {
45 Self::toggle(workspace, window, cx);
46 });
47 }
48
49 fn toggle(
50 workspace: &mut Workspace,
51 window: &mut Window,
52 cx: &mut Context<Workspace>,
53 ) -> Option<()> {
54 let registry = workspace.app_state().languages.clone();
55 let (_, buffer, _) = workspace
56 .active_item(cx)?
57 .act_as::<Editor>(cx)?
58 .read(cx)
59 .active_excerpt(cx)?;
60 let project = workspace.project().clone();
61
62 workspace.toggle_modal(window, cx, move |window, cx| {
63 LanguageSelector::new(buffer, project, registry, window, cx)
64 });
65 Some(())
66 }
67
68 fn new(
69 buffer: Entity<Buffer>,
70 project: Entity<Project>,
71 language_registry: Arc<LanguageRegistry>,
72 window: &mut Window,
73 cx: &mut Context<Self>,
74 ) -> Self {
75 let delegate = LanguageSelectorDelegate::new(
76 cx.entity().downgrade(),
77 buffer,
78 project,
79 language_registry,
80 );
81
82 let picker = cx.new(|cx| Picker::uniform_list(delegate, window, cx));
83 Self { picker }
84 }
85}
86
87impl Render for LanguageSelector {
88 fn render(&mut self, _window: &mut Window, _cx: &mut Context<Self>) -> impl IntoElement {
89 v_flex().w(rems(34.)).child(self.picker.clone())
90 }
91}
92
93impl Focusable for LanguageSelector {
94 fn focus_handle(&self, cx: &App) -> FocusHandle {
95 self.picker.focus_handle(cx)
96 }
97}
98
99impl EventEmitter<DismissEvent> for LanguageSelector {}
100impl ModalView for LanguageSelector {}
101
102pub struct LanguageSelectorDelegate {
103 language_selector: WeakEntity<LanguageSelector>,
104 buffer: Entity<Buffer>,
105 project: Entity<Project>,
106 language_registry: Arc<LanguageRegistry>,
107 candidates: Vec<StringMatchCandidate>,
108 matches: Vec<StringMatch>,
109 selected_index: usize,
110}
111
112impl LanguageSelectorDelegate {
113 fn new(
114 language_selector: WeakEntity<LanguageSelector>,
115 buffer: Entity<Buffer>,
116 project: Entity<Project>,
117 language_registry: Arc<LanguageRegistry>,
118 ) -> Self {
119 let candidates = language_registry
120 .language_names()
121 .into_iter()
122 .filter_map(|name| {
123 language_registry
124 .available_language_for_name(name.as_ref())?
125 .hidden()
126 .not()
127 .then_some(name)
128 })
129 .enumerate()
130 .map(|(candidate_id, name)| StringMatchCandidate::new(candidate_id, name.as_ref()))
131 .collect::<Vec<_>>();
132
133 Self {
134 language_selector,
135 buffer,
136 project,
137 language_registry,
138 candidates,
139 matches: vec![],
140 selected_index: 0,
141 }
142 }
143
144 fn language_data_for_match(&self, mat: &StringMatch, cx: &App) -> (String, Option<Icon>) {
145 let mut label = mat.string.clone();
146 let buffer_language = self.buffer.read(cx).language();
147 let need_icon = FileFinderSettings::get_global(cx).file_icons;
148
149 if let Some(buffer_language) = buffer_language
150 .filter(|buffer_language| buffer_language.name().as_ref() == mat.string.as_str())
151 {
152 label.push_str(" (current)");
153 let icon = need_icon
154 .then(|| self.language_icon(&buffer_language.config().matcher, cx))
155 .flatten();
156 (label, icon)
157 } else {
158 let icon = need_icon
159 .then(|| {
160 let language_name = LanguageName::new(mat.string.as_str());
161 self.language_registry
162 .available_language_for_name(language_name.as_ref())
163 .and_then(|available_language| {
164 self.language_icon(available_language.matcher(), cx)
165 })
166 })
167 .flatten();
168 (label, icon)
169 }
170 }
171
172 fn language_icon(&self, matcher: &LanguageMatcher, cx: &App) -> Option<Icon> {
173 matcher
174 .path_suffixes
175 .iter()
176 .find_map(|extension| FileIcons::get_icon(Path::new(extension), cx))
177 .map(Icon::from_path)
178 .map(|icon| icon.color(Color::Muted))
179 }
180}
181
182impl PickerDelegate for LanguageSelectorDelegate {
183 type ListItem = ListItem;
184
185 fn placeholder_text(&self, _window: &mut Window, _cx: &mut App) -> Arc<str> {
186 "Select a language…".into()
187 }
188
189 fn match_count(&self) -> usize {
190 self.matches.len()
191 }
192
193 fn confirm(&mut self, _: bool, window: &mut Window, cx: &mut Context<Picker<Self>>) {
194 if let Some(mat) = self.matches.get(self.selected_index) {
195 let language_name = &self.candidates[mat.candidate_id].string;
196 let language = self.language_registry.language_for_name(language_name);
197 let project = self.project.downgrade();
198 let buffer = self.buffer.downgrade();
199 cx.spawn_in(window, async move |_, cx| {
200 let language = language.await?;
201 let project = project.upgrade().context("project was dropped")?;
202 let buffer = buffer.upgrade().context("buffer was dropped")?;
203 project.update(cx, |project, cx| {
204 project.set_language_for_buffer(&buffer, language, cx);
205 })
206 })
207 .detach_and_log_err(cx);
208 }
209 self.dismissed(window, cx);
210 }
211
212 fn dismissed(&mut self, _: &mut Window, cx: &mut Context<Picker<Self>>) {
213 self.language_selector
214 .update(cx, |_, cx| cx.emit(DismissEvent))
215 .log_err();
216 }
217
218 fn selected_index(&self) -> usize {
219 self.selected_index
220 }
221
222 fn set_selected_index(
223 &mut self,
224 ix: usize,
225 _window: &mut Window,
226 _: &mut Context<Picker<Self>>,
227 ) {
228 self.selected_index = ix;
229 }
230
231 fn update_matches(
232 &mut self,
233 query: String,
234 window: &mut Window,
235 cx: &mut Context<Picker<Self>>,
236 ) -> gpui::Task<()> {
237 let background = cx.background_executor().clone();
238 let candidates = self.candidates.clone();
239 cx.spawn_in(window, async move |this, cx| {
240 let matches = if query.is_empty() {
241 candidates
242 .into_iter()
243 .enumerate()
244 .map(|(index, candidate)| StringMatch {
245 candidate_id: index,
246 string: candidate.string,
247 positions: Vec::new(),
248 score: 0.0,
249 })
250 .collect()
251 } else {
252 match_strings(
253 &candidates,
254 &query,
255 false,
256 true,
257 100,
258 &Default::default(),
259 background,
260 )
261 .await
262 };
263
264 this.update(cx, |this, cx| {
265 let delegate = &mut this.delegate;
266 delegate.matches = matches;
267 delegate.selected_index = delegate
268 .selected_index
269 .min(delegate.matches.len().saturating_sub(1));
270 cx.notify();
271 })
272 .log_err();
273 })
274 }
275
276 fn render_match(
277 &self,
278 ix: usize,
279 selected: bool,
280 _: &mut Window,
281 cx: &mut Context<Picker<Self>>,
282 ) -> Option<Self::ListItem> {
283 let mat = &self.matches[ix];
284 let (label, language_icon) = self.language_data_for_match(mat, cx);
285 Some(
286 ListItem::new(ix)
287 .inset(true)
288 .spacing(ListItemSpacing::Sparse)
289 .toggle_state(selected)
290 .start_slot::<Icon>(language_icon)
291 .child(HighlightedLabel::new(label, mat.positions.clone())),
292 )
293 }
294}