1use anyhow::{anyhow, bail, Context, Result};
2use async_trait::async_trait;
3use futures::StreamExt;
4use gpui::AsyncAppContext;
5use http_client::github::{latest_github_release, GitHubLspBinaryVersion};
6pub use language::*;
7use lsp::{LanguageServerBinary, LanguageServerName};
8use smol::fs::{self, File};
9use std::{any::Any, env::consts, path::PathBuf, sync::Arc};
10use util::{fs::remove_matching, maybe, ResultExt};
11
12pub struct CLspAdapter;
13
14impl CLspAdapter {
15 const SERVER_NAME: LanguageServerName = LanguageServerName::new_static("clangd");
16}
17
18#[async_trait(?Send)]
19impl super::LspAdapter for CLspAdapter {
20 fn name(&self) -> LanguageServerName {
21 Self::SERVER_NAME.clone()
22 }
23
24 async fn check_if_user_installed(
25 &self,
26 delegate: &dyn LspAdapterDelegate,
27 _: &AsyncAppContext,
28 ) -> Option<LanguageServerBinary> {
29 let path = delegate.which(Self::SERVER_NAME.as_ref()).await?;
30 Some(LanguageServerBinary {
31 path,
32 arguments: vec![],
33 env: None,
34 })
35 }
36
37 async fn fetch_latest_server_version(
38 &self,
39 delegate: &dyn LspAdapterDelegate,
40 ) -> Result<Box<dyn 'static + Send + Any>> {
41 let release =
42 latest_github_release("clangd/clangd", true, false, delegate.http_client()).await?;
43 let os_suffix = match consts::OS {
44 "macos" => "mac",
45 "linux" => "linux",
46 "windows" => "windows",
47 other => bail!("Running on unsupported os: {other}"),
48 };
49 let asset_name = format!("clangd-{}-{}.zip", os_suffix, release.tag_name);
50 let asset = release
51 .assets
52 .iter()
53 .find(|asset| asset.name == asset_name)
54 .ok_or_else(|| anyhow!("no asset found matching {:?}", asset_name))?;
55 let version = GitHubLspBinaryVersion {
56 name: release.tag_name,
57 url: asset.browser_download_url.clone(),
58 };
59 Ok(Box::new(version) as Box<_>)
60 }
61
62 async fn fetch_server_binary(
63 &self,
64 version: Box<dyn 'static + Send + Any>,
65 container_dir: PathBuf,
66 delegate: &dyn LspAdapterDelegate,
67 ) -> Result<LanguageServerBinary> {
68 let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
69 let zip_path = container_dir.join(format!("clangd_{}.zip", version.name));
70 let version_dir = container_dir.join(format!("clangd_{}", version.name));
71 let binary_path = version_dir.join("bin/clangd");
72
73 if fs::metadata(&binary_path).await.is_err() {
74 let mut response = delegate
75 .http_client()
76 .get(&version.url, Default::default(), true)
77 .await
78 .context("error downloading release")?;
79 let mut file = File::create(&zip_path).await?;
80 if !response.status().is_success() {
81 Err(anyhow!(
82 "download failed with status {}",
83 response.status().to_string()
84 ))?;
85 }
86 futures::io::copy(response.body_mut(), &mut file).await?;
87
88 let unzip_status = smol::process::Command::new("unzip")
89 .current_dir(&container_dir)
90 .arg(&zip_path)
91 .output()
92 .await?
93 .status;
94 if !unzip_status.success() {
95 Err(anyhow!("failed to unzip clangd archive"))?;
96 }
97
98 remove_matching(&container_dir, |entry| entry != version_dir).await;
99 }
100
101 Ok(LanguageServerBinary {
102 path: binary_path,
103 env: None,
104 arguments: vec![],
105 })
106 }
107
108 async fn cached_server_binary(
109 &self,
110 container_dir: PathBuf,
111 _: &dyn LspAdapterDelegate,
112 ) -> Option<LanguageServerBinary> {
113 get_cached_server_binary(container_dir).await
114 }
115
116 async fn label_for_completion(
117 &self,
118 completion: &lsp::CompletionItem,
119 language: &Arc<Language>,
120 ) -> Option<CodeLabel> {
121 let label = completion
122 .label
123 .strip_prefix('•')
124 .unwrap_or(&completion.label)
125 .trim();
126
127 match completion.kind {
128 Some(lsp::CompletionItemKind::FIELD) if completion.detail.is_some() => {
129 let detail = completion.detail.as_ref().unwrap();
130 let text = format!("{} {}", detail, label);
131 let source = Rope::from(format!("struct S {{ {} }}", text).as_str());
132 let runs = language.highlight_text(&source, 11..11 + text.len());
133 return Some(CodeLabel {
134 filter_range: detail.len() + 1..text.len(),
135 text,
136 runs,
137 });
138 }
139 Some(lsp::CompletionItemKind::CONSTANT | lsp::CompletionItemKind::VARIABLE)
140 if completion.detail.is_some() =>
141 {
142 let detail = completion.detail.as_ref().unwrap();
143 let text = format!("{} {}", detail, label);
144 let runs = language.highlight_text(&Rope::from(text.as_str()), 0..text.len());
145 return Some(CodeLabel {
146 filter_range: detail.len() + 1..text.len(),
147 text,
148 runs,
149 });
150 }
151 Some(lsp::CompletionItemKind::FUNCTION | lsp::CompletionItemKind::METHOD)
152 if completion.detail.is_some() =>
153 {
154 let detail = completion.detail.as_ref().unwrap();
155 let text = format!("{} {}", detail, label);
156 let runs = language.highlight_text(&Rope::from(text.as_str()), 0..text.len());
157 let filter_start = detail.len() + 1;
158 let filter_end =
159 if let Some(end) = text.rfind('(').filter(|end| *end > filter_start) {
160 end
161 } else {
162 text.len()
163 };
164
165 return Some(CodeLabel {
166 filter_range: filter_start..filter_end,
167 text,
168 runs,
169 });
170 }
171 Some(kind) => {
172 let highlight_name = match kind {
173 lsp::CompletionItemKind::STRUCT
174 | lsp::CompletionItemKind::INTERFACE
175 | lsp::CompletionItemKind::CLASS
176 | lsp::CompletionItemKind::ENUM => Some("type"),
177 lsp::CompletionItemKind::ENUM_MEMBER => Some("variant"),
178 lsp::CompletionItemKind::KEYWORD => Some("keyword"),
179 lsp::CompletionItemKind::VALUE | lsp::CompletionItemKind::CONSTANT => {
180 Some("constant")
181 }
182 _ => None,
183 };
184 if let Some(highlight_id) = language
185 .grammar()
186 .and_then(|g| g.highlight_id_for_name(highlight_name?))
187 {
188 let mut label = CodeLabel::plain(label.to_string(), None);
189 label.runs.push((
190 0..label.text.rfind('(').unwrap_or(label.text.len()),
191 highlight_id,
192 ));
193 return Some(label);
194 }
195 }
196 _ => {}
197 }
198 Some(CodeLabel::plain(label.to_string(), None))
199 }
200
201 async fn label_for_symbol(
202 &self,
203 name: &str,
204 kind: lsp::SymbolKind,
205 language: &Arc<Language>,
206 ) -> Option<CodeLabel> {
207 let (text, filter_range, display_range) = match kind {
208 lsp::SymbolKind::METHOD | lsp::SymbolKind::FUNCTION => {
209 let text = format!("void {} () {{}}", name);
210 let filter_range = 0..name.len();
211 let display_range = 5..5 + name.len();
212 (text, filter_range, display_range)
213 }
214 lsp::SymbolKind::STRUCT => {
215 let text = format!("struct {} {{}}", name);
216 let filter_range = 7..7 + name.len();
217 let display_range = 0..filter_range.end;
218 (text, filter_range, display_range)
219 }
220 lsp::SymbolKind::ENUM => {
221 let text = format!("enum {} {{}}", name);
222 let filter_range = 5..5 + name.len();
223 let display_range = 0..filter_range.end;
224 (text, filter_range, display_range)
225 }
226 lsp::SymbolKind::INTERFACE | lsp::SymbolKind::CLASS => {
227 let text = format!("class {} {{}}", name);
228 let filter_range = 6..6 + name.len();
229 let display_range = 0..filter_range.end;
230 (text, filter_range, display_range)
231 }
232 lsp::SymbolKind::CONSTANT => {
233 let text = format!("const int {} = 0;", name);
234 let filter_range = 10..10 + name.len();
235 let display_range = 0..filter_range.end;
236 (text, filter_range, display_range)
237 }
238 lsp::SymbolKind::MODULE => {
239 let text = format!("namespace {} {{}}", name);
240 let filter_range = 10..10 + name.len();
241 let display_range = 0..filter_range.end;
242 (text, filter_range, display_range)
243 }
244 lsp::SymbolKind::TYPE_PARAMETER => {
245 let text = format!("typename {} {{}};", name);
246 let filter_range = 9..9 + name.len();
247 let display_range = 0..filter_range.end;
248 (text, filter_range, display_range)
249 }
250 _ => return None,
251 };
252
253 Some(CodeLabel {
254 runs: language.highlight_text(&text.as_str().into(), display_range.clone()),
255 text: text[display_range].to_string(),
256 filter_range,
257 })
258 }
259}
260
261async fn get_cached_server_binary(container_dir: PathBuf) -> Option<LanguageServerBinary> {
262 maybe!(async {
263 let mut last_clangd_dir = None;
264 let mut entries = fs::read_dir(&container_dir).await?;
265 while let Some(entry) = entries.next().await {
266 let entry = entry?;
267 if entry.file_type().await?.is_dir() {
268 last_clangd_dir = Some(entry.path());
269 }
270 }
271 let clangd_dir = last_clangd_dir.ok_or_else(|| anyhow!("no cached binary"))?;
272 let clangd_bin = clangd_dir.join("bin/clangd");
273 if clangd_bin.exists() {
274 Ok(LanguageServerBinary {
275 path: clangd_bin,
276 env: None,
277 arguments: vec![],
278 })
279 } else {
280 Err(anyhow!(
281 "missing clangd binary in directory {:?}",
282 clangd_dir
283 ))
284 }
285 })
286 .await
287 .log_err()
288}
289
290#[cfg(test)]
291mod tests {
292 use gpui::{BorrowAppContext, Context, TestAppContext};
293 use language::{language_settings::AllLanguageSettings, AutoindentMode, Buffer};
294 use settings::SettingsStore;
295 use std::num::NonZeroU32;
296
297 #[gpui::test]
298 async fn test_c_autoindent(cx: &mut TestAppContext) {
299 // cx.executor().set_block_on_ticks(usize::MAX..=usize::MAX);
300 cx.update(|cx| {
301 let test_settings = SettingsStore::test(cx);
302 cx.set_global(test_settings);
303 language::init(cx);
304 cx.update_global::<SettingsStore, _>(|store, cx| {
305 store.update_user_settings::<AllLanguageSettings>(cx, |s| {
306 s.defaults.tab_size = NonZeroU32::new(2);
307 });
308 });
309 });
310 let language = crate::language("c", tree_sitter_c::LANGUAGE.into());
311
312 cx.new_model(|cx| {
313 let mut buffer = Buffer::local("", cx).with_language(language, cx);
314
315 // empty function
316 buffer.edit([(0..0, "int main() {}")], None, cx);
317
318 // indent inside braces
319 let ix = buffer.len() - 1;
320 buffer.edit([(ix..ix, "\n\n")], Some(AutoindentMode::EachLine), cx);
321 assert_eq!(buffer.text(), "int main() {\n \n}");
322
323 // indent body of single-statement if statement
324 let ix = buffer.len() - 2;
325 buffer.edit([(ix..ix, "if (a)\nb;")], Some(AutoindentMode::EachLine), cx);
326 assert_eq!(buffer.text(), "int main() {\n if (a)\n b;\n}");
327
328 // indent inside field expression
329 let ix = buffer.len() - 3;
330 buffer.edit([(ix..ix, "\n.c")], Some(AutoindentMode::EachLine), cx);
331 assert_eq!(buffer.text(), "int main() {\n if (a)\n b\n .c;\n}");
332
333 buffer
334 });
335 }
336}