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