1use anyhow::{Context as _, ensure};
2use anyhow::{Result, anyhow};
3use async_trait::async_trait;
4use collections::HashMap;
5use gpui::{App, Task};
6use gpui::{AsyncApp, SharedString};
7use language::ToolchainList;
8use language::ToolchainLister;
9use language::language_settings::language_settings;
10use language::{ContextLocation, LanguageToolchainStore};
11use language::{ContextProvider, LspAdapter, LspAdapterDelegate};
12use language::{LanguageName, ManifestName, ManifestProvider, ManifestQuery};
13use language::{Toolchain, WorkspaceFoldersContent};
14use lsp::LanguageServerBinary;
15use lsp::LanguageServerName;
16use node_runtime::NodeRuntime;
17use pet_core::Configuration;
18use pet_core::os_environment::Environment;
19use pet_core::python_environment::PythonEnvironmentKind;
20use project::Fs;
21use project::lsp_store::language_server_settings;
22use serde_json::{Value, json};
23use smol::lock::OnceCell;
24use std::cmp::Ordering;
25
26use parking_lot::Mutex;
27use std::str::FromStr;
28use std::{
29 any::Any,
30 borrow::Cow,
31 ffi::OsString,
32 fmt::Write,
33 fs,
34 io::{self, BufRead},
35 path::{Path, PathBuf},
36 sync::Arc,
37};
38use task::{TaskTemplate, TaskTemplates, VariableName};
39use util::ResultExt;
40
41pub(crate) struct PyprojectTomlManifestProvider;
42
43impl ManifestProvider for PyprojectTomlManifestProvider {
44 fn name(&self) -> ManifestName {
45 SharedString::new_static("pyproject.toml").into()
46 }
47
48 fn search(
49 &self,
50 ManifestQuery {
51 path,
52 depth,
53 delegate,
54 }: ManifestQuery,
55 ) -> Option<Arc<Path>> {
56 for path in path.ancestors().take(depth) {
57 let p = path.join("pyproject.toml");
58 if delegate.exists(&p, Some(false)) {
59 return Some(path.into());
60 }
61 }
62
63 None
64 }
65}
66
67const SERVER_PATH: &str = "node_modules/pyright/langserver.index.js";
68const NODE_MODULE_RELATIVE_SERVER_PATH: &str = "pyright/langserver.index.js";
69
70enum TestRunner {
71 UNITTEST,
72 PYTEST,
73}
74
75impl FromStr for TestRunner {
76 type Err = ();
77
78 fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
79 match s {
80 "unittest" => Ok(Self::UNITTEST),
81 "pytest" => Ok(Self::PYTEST),
82 _ => Err(()),
83 }
84 }
85}
86
87fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
88 vec![server_path.into(), "--stdio".into()]
89}
90
91pub struct PythonLspAdapter {
92 node: NodeRuntime,
93}
94
95impl PythonLspAdapter {
96 const SERVER_NAME: LanguageServerName = LanguageServerName::new_static("pyright");
97
98 pub fn new(node: NodeRuntime) -> Self {
99 PythonLspAdapter { node }
100 }
101}
102
103#[async_trait(?Send)]
104impl LspAdapter for PythonLspAdapter {
105 fn name(&self) -> LanguageServerName {
106 Self::SERVER_NAME.clone()
107 }
108
109 async fn initialization_options(
110 self: Arc<Self>,
111 _: &dyn Fs,
112 _: &Arc<dyn LspAdapterDelegate>,
113 ) -> Result<Option<Value>> {
114 // Provide minimal initialization options
115 // Virtual environment configuration will be handled through workspace configuration
116 Ok(Some(json!({
117 "python": {
118 "analysis": {
119 "autoSearchPaths": true,
120 "useLibraryCodeForTypes": true,
121 "autoImportCompletions": true
122 }
123 }
124 })))
125 }
126
127 async fn check_if_user_installed(
128 &self,
129 delegate: &dyn LspAdapterDelegate,
130 _: Arc<dyn LanguageToolchainStore>,
131 _: &AsyncApp,
132 ) -> Option<LanguageServerBinary> {
133 if let Some(pyright_bin) = delegate.which("pyright-langserver".as_ref()).await {
134 let env = delegate.shell_env().await;
135 Some(LanguageServerBinary {
136 path: pyright_bin,
137 env: Some(env),
138 arguments: vec!["--stdio".into()],
139 })
140 } else {
141 let node = delegate.which("node".as_ref()).await?;
142 let (node_modules_path, _) = delegate
143 .npm_package_installed_version(Self::SERVER_NAME.as_ref())
144 .await
145 .log_err()??;
146
147 let path = node_modules_path.join(NODE_MODULE_RELATIVE_SERVER_PATH);
148
149 let env = delegate.shell_env().await;
150 Some(LanguageServerBinary {
151 path: node,
152 env: Some(env),
153 arguments: server_binary_arguments(&path),
154 })
155 }
156 }
157
158 async fn fetch_latest_server_version(
159 &self,
160 _: &dyn LspAdapterDelegate,
161 ) -> Result<Box<dyn 'static + Any + Send>> {
162 Ok(Box::new(
163 self.node
164 .npm_package_latest_version(Self::SERVER_NAME.as_ref())
165 .await?,
166 ) as Box<_>)
167 }
168
169 async fn fetch_server_binary(
170 &self,
171 latest_version: Box<dyn 'static + Send + Any>,
172 container_dir: PathBuf,
173 delegate: &dyn LspAdapterDelegate,
174 ) -> Result<LanguageServerBinary> {
175 let latest_version = latest_version.downcast::<String>().unwrap();
176 let server_path = container_dir.join(SERVER_PATH);
177
178 self.node
179 .npm_install_packages(
180 &container_dir,
181 &[(Self::SERVER_NAME.as_ref(), latest_version.as_str())],
182 )
183 .await?;
184
185 let env = delegate.shell_env().await;
186 Ok(LanguageServerBinary {
187 path: self.node.binary_path().await?,
188 env: Some(env),
189 arguments: server_binary_arguments(&server_path),
190 })
191 }
192
193 async fn check_if_version_installed(
194 &self,
195 version: &(dyn 'static + Send + Any),
196 container_dir: &PathBuf,
197 delegate: &dyn LspAdapterDelegate,
198 ) -> Option<LanguageServerBinary> {
199 let version = version.downcast_ref::<String>().unwrap();
200 let server_path = container_dir.join(SERVER_PATH);
201
202 let should_install_language_server = self
203 .node
204 .should_install_npm_package(
205 Self::SERVER_NAME.as_ref(),
206 &server_path,
207 &container_dir,
208 &version,
209 )
210 .await;
211
212 if should_install_language_server {
213 None
214 } else {
215 let env = delegate.shell_env().await;
216 Some(LanguageServerBinary {
217 path: self.node.binary_path().await.ok()?,
218 env: Some(env),
219 arguments: server_binary_arguments(&server_path),
220 })
221 }
222 }
223
224 async fn cached_server_binary(
225 &self,
226 container_dir: PathBuf,
227 delegate: &dyn LspAdapterDelegate,
228 ) -> Option<LanguageServerBinary> {
229 let mut binary = get_cached_server_binary(container_dir, &self.node).await?;
230 binary.env = Some(delegate.shell_env().await);
231 Some(binary)
232 }
233
234 async fn process_completions(&self, items: &mut [lsp::CompletionItem]) {
235 // Pyright assigns each completion item a `sortText` of the form `XX.YYYY.name`.
236 // Where `XX` is the sorting category, `YYYY` is based on most recent usage,
237 // and `name` is the symbol name itself.
238 //
239 // Because the symbol name is included, there generally are not ties when
240 // sorting by the `sortText`, so the symbol's fuzzy match score is not taken
241 // into account. Here, we remove the symbol name from the sortText in order
242 // to allow our own fuzzy score to be used to break ties.
243 //
244 // see https://github.com/microsoft/pyright/blob/95ef4e103b9b2f129c9320427e51b73ea7cf78bd/packages/pyright-internal/src/languageService/completionProvider.ts#LL2873
245 for item in items {
246 let Some(sort_text) = &mut item.sort_text else {
247 continue;
248 };
249 let mut parts = sort_text.split('.');
250 let Some(first) = parts.next() else { continue };
251 let Some(second) = parts.next() else { continue };
252 let Some(_) = parts.next() else { continue };
253 sort_text.replace_range(first.len() + second.len() + 1.., "");
254 }
255 }
256
257 async fn label_for_completion(
258 &self,
259 item: &lsp::CompletionItem,
260 language: &Arc<language::Language>,
261 ) -> Option<language::CodeLabel> {
262 let label = &item.label;
263 let grammar = language.grammar()?;
264 let highlight_id = match item.kind? {
265 lsp::CompletionItemKind::METHOD => grammar.highlight_id_for_name("function.method")?,
266 lsp::CompletionItemKind::FUNCTION => grammar.highlight_id_for_name("function")?,
267 lsp::CompletionItemKind::CLASS => grammar.highlight_id_for_name("type")?,
268 lsp::CompletionItemKind::CONSTANT => grammar.highlight_id_for_name("constant")?,
269 _ => return None,
270 };
271 let filter_range = item
272 .filter_text
273 .as_deref()
274 .and_then(|filter| label.find(filter).map(|ix| ix..ix + filter.len()))
275 .unwrap_or(0..label.len());
276 Some(language::CodeLabel {
277 text: label.clone(),
278 runs: vec![(0..label.len(), highlight_id)],
279 filter_range,
280 })
281 }
282
283 async fn label_for_symbol(
284 &self,
285 name: &str,
286 kind: lsp::SymbolKind,
287 language: &Arc<language::Language>,
288 ) -> Option<language::CodeLabel> {
289 let (text, filter_range, display_range) = match kind {
290 lsp::SymbolKind::METHOD | lsp::SymbolKind::FUNCTION => {
291 let text = format!("def {}():\n", name);
292 let filter_range = 4..4 + name.len();
293 let display_range = 0..filter_range.end;
294 (text, filter_range, display_range)
295 }
296 lsp::SymbolKind::CLASS => {
297 let text = format!("class {}:", name);
298 let filter_range = 6..6 + name.len();
299 let display_range = 0..filter_range.end;
300 (text, filter_range, display_range)
301 }
302 lsp::SymbolKind::CONSTANT => {
303 let text = format!("{} = 0", name);
304 let filter_range = 0..name.len();
305 let display_range = 0..filter_range.end;
306 (text, filter_range, display_range)
307 }
308 _ => return None,
309 };
310
311 Some(language::CodeLabel {
312 runs: language.highlight_text(&text.as_str().into(), display_range.clone()),
313 text: text[display_range].to_string(),
314 filter_range,
315 })
316 }
317
318 async fn workspace_configuration(
319 self: Arc<Self>,
320 _: &dyn Fs,
321 adapter: &Arc<dyn LspAdapterDelegate>,
322 toolchains: Arc<dyn LanguageToolchainStore>,
323 cx: &mut AsyncApp,
324 ) -> Result<Value> {
325 let toolchain = toolchains
326 .active_toolchain(
327 adapter.worktree_id(),
328 Arc::from("".as_ref()),
329 LanguageName::new("Python"),
330 cx,
331 )
332 .await;
333 cx.update(move |cx| {
334 let mut user_settings =
335 language_server_settings(adapter.as_ref(), &Self::SERVER_NAME, cx)
336 .and_then(|s| s.settings.clone())
337 .unwrap_or_default();
338
339 // If we have a detected toolchain, configure Pyright to use it
340 if let Some(toolchain) = toolchain {
341 if user_settings.is_null() {
342 user_settings = Value::Object(serde_json::Map::default());
343 }
344 let object = user_settings.as_object_mut().unwrap();
345
346 let interpreter_path = toolchain.path.to_string();
347
348 // Detect if this is a virtual environment
349 if let Some(interpreter_dir) = Path::new(&interpreter_path).parent() {
350 if let Some(venv_dir) = interpreter_dir.parent() {
351 // Check if this looks like a virtual environment
352 if venv_dir.join("pyvenv.cfg").exists()
353 || venv_dir.join("bin/activate").exists()
354 || venv_dir.join("Scripts/activate.bat").exists()
355 {
356 // Set venvPath and venv at the root level
357 // This matches the format of a pyrightconfig.json file
358 if let Some(parent) = venv_dir.parent() {
359 // Use relative path if the venv is inside the workspace
360 let venv_path = if parent == adapter.worktree_root_path() {
361 ".".to_string()
362 } else {
363 parent.to_string_lossy().into_owned()
364 };
365 object.insert("venvPath".to_string(), Value::String(venv_path));
366 }
367
368 if let Some(venv_name) = venv_dir.file_name() {
369 object.insert(
370 "venv".to_owned(),
371 Value::String(venv_name.to_string_lossy().into_owned()),
372 );
373 }
374 }
375 }
376 }
377
378 // Always set the python interpreter path
379 // Get or create the python section
380 let python = object
381 .entry("python")
382 .or_insert(Value::Object(serde_json::Map::default()))
383 .as_object_mut()
384 .unwrap();
385
386 // Set both pythonPath and defaultInterpreterPath for compatibility
387 python.insert(
388 "pythonPath".to_owned(),
389 Value::String(interpreter_path.clone()),
390 );
391 python.insert(
392 "defaultInterpreterPath".to_owned(),
393 Value::String(interpreter_path),
394 );
395 }
396
397 user_settings
398 })
399 }
400 fn manifest_name(&self) -> Option<ManifestName> {
401 Some(SharedString::new_static("pyproject.toml").into())
402 }
403 fn workspace_folders_content(&self) -> WorkspaceFoldersContent {
404 WorkspaceFoldersContent::WorktreeRoot
405 }
406}
407
408async fn get_cached_server_binary(
409 container_dir: PathBuf,
410 node: &NodeRuntime,
411) -> Option<LanguageServerBinary> {
412 let server_path = container_dir.join(SERVER_PATH);
413 if server_path.exists() {
414 Some(LanguageServerBinary {
415 path: node.binary_path().await.log_err()?,
416 env: None,
417 arguments: server_binary_arguments(&server_path),
418 })
419 } else {
420 log::error!("missing executable in directory {:?}", server_path);
421 None
422 }
423}
424
425pub(crate) struct PythonContextProvider;
426
427const PYTHON_TEST_TARGET_TASK_VARIABLE: VariableName =
428 VariableName::Custom(Cow::Borrowed("PYTHON_TEST_TARGET"));
429
430const PYTHON_ACTIVE_TOOLCHAIN_PATH: VariableName =
431 VariableName::Custom(Cow::Borrowed("PYTHON_ACTIVE_ZED_TOOLCHAIN"));
432
433const PYTHON_ACTIVE_TOOLCHAIN_PATH_RAW: VariableName =
434 VariableName::Custom(Cow::Borrowed("PYTHON_ACTIVE_ZED_TOOLCHAIN_RAW"));
435
436const PYTHON_MODULE_NAME_TASK_VARIABLE: VariableName =
437 VariableName::Custom(Cow::Borrowed("PYTHON_MODULE_NAME"));
438
439impl ContextProvider for PythonContextProvider {
440 fn build_context(
441 &self,
442 variables: &task::TaskVariables,
443 location: ContextLocation<'_>,
444 _: Option<HashMap<String, String>>,
445 toolchains: Arc<dyn LanguageToolchainStore>,
446 cx: &mut gpui::App,
447 ) -> Task<Result<task::TaskVariables>> {
448 let test_target =
449 match selected_test_runner(location.file_location.buffer.read(cx).file(), cx) {
450 TestRunner::UNITTEST => self.build_unittest_target(variables),
451 TestRunner::PYTEST => self.build_pytest_target(variables),
452 };
453
454 let module_target = self.build_module_target(variables);
455 let location_file = location.file_location.buffer.read(cx).file().cloned();
456 let worktree_id = location_file.as_ref().map(|f| f.worktree_id(cx));
457
458 cx.spawn(async move |cx| {
459 let raw_toolchain = if let Some(worktree_id) = worktree_id {
460 let file_path = location_file
461 .as_ref()
462 .and_then(|f| f.path().parent())
463 .map(Arc::from)
464 .unwrap_or_else(|| Arc::from("".as_ref()));
465
466 toolchains
467 .active_toolchain(worktree_id, file_path, "Python".into(), cx)
468 .await
469 .map_or_else(
470 || String::from("python3"),
471 |toolchain| toolchain.path.to_string(),
472 )
473 } else {
474 String::from("python3")
475 };
476
477 let active_toolchain = format!("\"{raw_toolchain}\"");
478 let toolchain = (PYTHON_ACTIVE_TOOLCHAIN_PATH, active_toolchain);
479 let raw_toolchain_var = (PYTHON_ACTIVE_TOOLCHAIN_PATH_RAW, raw_toolchain);
480
481 Ok(task::TaskVariables::from_iter(
482 test_target
483 .into_iter()
484 .chain(module_target.into_iter())
485 .chain([toolchain, raw_toolchain_var]),
486 ))
487 })
488 }
489
490 fn associated_tasks(
491 &self,
492 _: Arc<dyn Fs>,
493 file: Option<Arc<dyn language::File>>,
494 cx: &App,
495 ) -> Task<Option<TaskTemplates>> {
496 let test_runner = selected_test_runner(file.as_ref(), cx);
497
498 let mut tasks = vec![
499 // Execute a selection
500 TaskTemplate {
501 label: "execute selection".to_owned(),
502 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
503 args: vec![
504 "-c".to_owned(),
505 VariableName::SelectedText.template_value_with_whitespace(),
506 ],
507 cwd: Some("$ZED_WORKTREE_ROOT".into()),
508 ..TaskTemplate::default()
509 },
510 // Execute an entire file
511 TaskTemplate {
512 label: format!("run '{}'", VariableName::File.template_value()),
513 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
514 args: vec![VariableName::File.template_value_with_whitespace()],
515 cwd: Some("$ZED_WORKTREE_ROOT".into()),
516 ..TaskTemplate::default()
517 },
518 // Execute a file as module
519 TaskTemplate {
520 label: format!("run module '{}'", VariableName::File.template_value()),
521 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
522 args: vec![
523 "-m".to_owned(),
524 PYTHON_MODULE_NAME_TASK_VARIABLE.template_value(),
525 ],
526 cwd: Some("$ZED_WORKTREE_ROOT".into()),
527 tags: vec!["python-module-main-method".to_owned()],
528 ..TaskTemplate::default()
529 },
530 ];
531
532 tasks.extend(match test_runner {
533 TestRunner::UNITTEST => {
534 [
535 // Run tests for an entire file
536 TaskTemplate {
537 label: format!("unittest '{}'", VariableName::File.template_value()),
538 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
539 args: vec![
540 "-m".to_owned(),
541 "unittest".to_owned(),
542 VariableName::File.template_value_with_whitespace(),
543 ],
544 cwd: Some("$ZED_WORKTREE_ROOT".into()),
545 ..TaskTemplate::default()
546 },
547 // Run test(s) for a specific target within a file
548 TaskTemplate {
549 label: "unittest $ZED_CUSTOM_PYTHON_TEST_TARGET".to_owned(),
550 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
551 args: vec![
552 "-m".to_owned(),
553 "unittest".to_owned(),
554 PYTHON_TEST_TARGET_TASK_VARIABLE.template_value_with_whitespace(),
555 ],
556 tags: vec![
557 "python-unittest-class".to_owned(),
558 "python-unittest-method".to_owned(),
559 ],
560 cwd: Some("$ZED_WORKTREE_ROOT".into()),
561 ..TaskTemplate::default()
562 },
563 ]
564 }
565 TestRunner::PYTEST => {
566 [
567 // Run tests for an entire file
568 TaskTemplate {
569 label: format!("pytest '{}'", VariableName::File.template_value()),
570 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
571 args: vec![
572 "-m".to_owned(),
573 "pytest".to_owned(),
574 VariableName::File.template_value_with_whitespace(),
575 ],
576 cwd: Some("$ZED_WORKTREE_ROOT".into()),
577 ..TaskTemplate::default()
578 },
579 // Run test(s) for a specific target within a file
580 TaskTemplate {
581 label: "pytest $ZED_CUSTOM_PYTHON_TEST_TARGET".to_owned(),
582 command: PYTHON_ACTIVE_TOOLCHAIN_PATH.template_value(),
583 args: vec![
584 "-m".to_owned(),
585 "pytest".to_owned(),
586 PYTHON_TEST_TARGET_TASK_VARIABLE.template_value_with_whitespace(),
587 ],
588 cwd: Some("$ZED_WORKTREE_ROOT".into()),
589 tags: vec![
590 "python-pytest-class".to_owned(),
591 "python-pytest-method".to_owned(),
592 ],
593 ..TaskTemplate::default()
594 },
595 ]
596 }
597 });
598
599 Task::ready(Some(TaskTemplates(tasks)))
600 }
601}
602
603fn selected_test_runner(location: Option<&Arc<dyn language::File>>, cx: &App) -> TestRunner {
604 const TEST_RUNNER_VARIABLE: &str = "TEST_RUNNER";
605 language_settings(Some(LanguageName::new("Python")), location, cx)
606 .tasks
607 .variables
608 .get(TEST_RUNNER_VARIABLE)
609 .and_then(|val| TestRunner::from_str(val).ok())
610 .unwrap_or(TestRunner::PYTEST)
611}
612
613impl PythonContextProvider {
614 fn build_unittest_target(
615 &self,
616 variables: &task::TaskVariables,
617 ) -> Option<(VariableName, String)> {
618 let python_module_name =
619 python_module_name_from_relative_path(variables.get(&VariableName::RelativeFile)?);
620
621 let unittest_class_name =
622 variables.get(&VariableName::Custom(Cow::Borrowed("_unittest_class_name")));
623
624 let unittest_method_name = variables.get(&VariableName::Custom(Cow::Borrowed(
625 "_unittest_method_name",
626 )));
627
628 let unittest_target_str = match (unittest_class_name, unittest_method_name) {
629 (Some(class_name), Some(method_name)) => {
630 format!("{python_module_name}.{class_name}.{method_name}")
631 }
632 (Some(class_name), None) => format!("{python_module_name}.{class_name}"),
633 (None, None) => python_module_name,
634 // should never happen, a TestCase class is the unit of testing
635 (None, Some(_)) => return None,
636 };
637
638 Some((
639 PYTHON_TEST_TARGET_TASK_VARIABLE.clone(),
640 unittest_target_str,
641 ))
642 }
643
644 fn build_pytest_target(
645 &self,
646 variables: &task::TaskVariables,
647 ) -> Option<(VariableName, String)> {
648 let file_path = variables.get(&VariableName::RelativeFile)?;
649
650 let pytest_class_name =
651 variables.get(&VariableName::Custom(Cow::Borrowed("_pytest_class_name")));
652
653 let pytest_method_name =
654 variables.get(&VariableName::Custom(Cow::Borrowed("_pytest_method_name")));
655
656 let pytest_target_str = match (pytest_class_name, pytest_method_name) {
657 (Some(class_name), Some(method_name)) => {
658 format!("{file_path}::{class_name}::{method_name}")
659 }
660 (Some(class_name), None) => {
661 format!("{file_path}::{class_name}")
662 }
663 (None, Some(method_name)) => {
664 format!("{file_path}::{method_name}")
665 }
666 (None, None) => file_path.to_string(),
667 };
668
669 Some((PYTHON_TEST_TARGET_TASK_VARIABLE.clone(), pytest_target_str))
670 }
671
672 fn build_module_target(
673 &self,
674 variables: &task::TaskVariables,
675 ) -> Result<(VariableName, String)> {
676 let python_module_name = python_module_name_from_relative_path(
677 variables.get(&VariableName::RelativeFile).unwrap_or(""),
678 );
679
680 let module_target = (PYTHON_MODULE_NAME_TASK_VARIABLE.clone(), python_module_name);
681
682 Ok(module_target)
683 }
684}
685
686fn python_module_name_from_relative_path(relative_path: &str) -> String {
687 let path_with_dots = relative_path.replace('/', ".");
688 path_with_dots
689 .strip_suffix(".py")
690 .unwrap_or(&path_with_dots)
691 .to_string()
692}
693
694fn python_env_kind_display(k: &PythonEnvironmentKind) -> &'static str {
695 match k {
696 PythonEnvironmentKind::Conda => "Conda",
697 PythonEnvironmentKind::Pixi => "pixi",
698 PythonEnvironmentKind::Homebrew => "Homebrew",
699 PythonEnvironmentKind::Pyenv => "global (Pyenv)",
700 PythonEnvironmentKind::GlobalPaths => "global",
701 PythonEnvironmentKind::PyenvVirtualEnv => "Pyenv",
702 PythonEnvironmentKind::Pipenv => "Pipenv",
703 PythonEnvironmentKind::Poetry => "Poetry",
704 PythonEnvironmentKind::MacPythonOrg => "global (Python.org)",
705 PythonEnvironmentKind::MacCommandLineTools => "global (Command Line Tools for Xcode)",
706 PythonEnvironmentKind::LinuxGlobal => "global",
707 PythonEnvironmentKind::MacXCode => "global (Xcode)",
708 PythonEnvironmentKind::Venv => "venv",
709 PythonEnvironmentKind::VirtualEnv => "virtualenv",
710 PythonEnvironmentKind::VirtualEnvWrapper => "virtualenvwrapper",
711 PythonEnvironmentKind::WindowsStore => "global (Windows Store)",
712 PythonEnvironmentKind::WindowsRegistry => "global (Windows Registry)",
713 }
714}
715
716pub(crate) struct PythonToolchainProvider {
717 term: SharedString,
718}
719
720impl Default for PythonToolchainProvider {
721 fn default() -> Self {
722 Self {
723 term: SharedString::new_static("Virtual Environment"),
724 }
725 }
726}
727
728static ENV_PRIORITY_LIST: &'static [PythonEnvironmentKind] = &[
729 // Prioritize non-Conda environments.
730 PythonEnvironmentKind::Poetry,
731 PythonEnvironmentKind::Pipenv,
732 PythonEnvironmentKind::VirtualEnvWrapper,
733 PythonEnvironmentKind::Venv,
734 PythonEnvironmentKind::VirtualEnv,
735 PythonEnvironmentKind::PyenvVirtualEnv,
736 PythonEnvironmentKind::Pixi,
737 PythonEnvironmentKind::Conda,
738 PythonEnvironmentKind::Pyenv,
739 PythonEnvironmentKind::GlobalPaths,
740 PythonEnvironmentKind::Homebrew,
741];
742
743fn env_priority(kind: Option<PythonEnvironmentKind>) -> usize {
744 if let Some(kind) = kind {
745 ENV_PRIORITY_LIST
746 .iter()
747 .position(|blessed_env| blessed_env == &kind)
748 .unwrap_or(ENV_PRIORITY_LIST.len())
749 } else {
750 // Unknown toolchains are less useful than non-blessed ones.
751 ENV_PRIORITY_LIST.len() + 1
752 }
753}
754
755/// Return the name of environment declared in <worktree-root/.venv.
756///
757/// https://virtualfish.readthedocs.io/en/latest/plugins.html#auto-activation-auto-activation
758fn get_worktree_venv_declaration(worktree_root: &Path) -> Option<String> {
759 fs::File::open(worktree_root.join(".venv"))
760 .and_then(|file| {
761 let mut venv_name = String::new();
762 io::BufReader::new(file).read_line(&mut venv_name)?;
763 Ok(venv_name.trim().to_string())
764 })
765 .ok()
766}
767
768#[async_trait]
769impl ToolchainLister for PythonToolchainProvider {
770 fn manifest_name(&self) -> language::ManifestName {
771 ManifestName::from(SharedString::new_static("pyproject.toml"))
772 }
773 async fn list(
774 &self,
775 worktree_root: PathBuf,
776 subroot_relative_path: Option<Arc<Path>>,
777 project_env: Option<HashMap<String, String>>,
778 ) -> ToolchainList {
779 let env = project_env.unwrap_or_default();
780 let environment = EnvironmentApi::from_env(&env);
781 let locators = pet::locators::create_locators(
782 Arc::new(pet_conda::Conda::from(&environment)),
783 Arc::new(pet_poetry::Poetry::from(&environment)),
784 &environment,
785 );
786 let mut config = Configuration::default();
787
788 let mut directories = vec![worktree_root.clone()];
789 if let Some(subroot_relative_path) = subroot_relative_path {
790 debug_assert!(subroot_relative_path.is_relative());
791 directories.push(worktree_root.join(subroot_relative_path));
792 }
793
794 config.workspace_directories = Some(directories);
795 for locator in locators.iter() {
796 locator.configure(&config);
797 }
798
799 let reporter = pet_reporter::collect::create_reporter();
800 pet::find::find_and_report_envs(&reporter, config, &locators, &environment, None);
801
802 let mut toolchains = reporter
803 .environments
804 .lock()
805 .map_or(Vec::new(), |mut guard| std::mem::take(&mut guard));
806
807 let wr = worktree_root;
808 let wr_venv = get_worktree_venv_declaration(&wr);
809 // Sort detected environments by:
810 // environment name matching activation file (<workdir>/.venv)
811 // environment project dir matching worktree_root
812 // general env priority
813 // environment path matching the CONDA_PREFIX env var
814 // executable path
815 toolchains.sort_by(|lhs, rhs| {
816 // Compare venv names against worktree .venv file
817 let venv_ordering =
818 wr_venv
819 .as_ref()
820 .map_or(Ordering::Equal, |venv| match (&lhs.name, &rhs.name) {
821 (Some(l), Some(r)) => (r == venv).cmp(&(l == venv)),
822 (Some(l), None) if l == venv => Ordering::Less,
823 (None, Some(r)) if r == venv => Ordering::Greater,
824 _ => Ordering::Equal,
825 });
826
827 // Compare project paths against worktree root
828 let proj_ordering = || match (&lhs.project, &rhs.project) {
829 (Some(l), Some(r)) => (r == &wr).cmp(&(l == &wr)),
830 (Some(l), None) if l == &wr => Ordering::Less,
831 (None, Some(r)) if r == &wr => Ordering::Greater,
832 _ => Ordering::Equal,
833 };
834
835 // Compare environment priorities
836 let priority_ordering = || env_priority(lhs.kind).cmp(&env_priority(rhs.kind));
837
838 // Compare conda prefixes
839 let conda_ordering = || {
840 if lhs.kind == Some(PythonEnvironmentKind::Conda) {
841 environment
842 .get_env_var("CONDA_PREFIX".to_string())
843 .map(|conda_prefix| {
844 let is_match = |exe: &Option<PathBuf>| {
845 exe.as_ref().map_or(false, |e| e.starts_with(&conda_prefix))
846 };
847 match (is_match(&lhs.executable), is_match(&rhs.executable)) {
848 (true, false) => Ordering::Less,
849 (false, true) => Ordering::Greater,
850 _ => Ordering::Equal,
851 }
852 })
853 .unwrap_or(Ordering::Equal)
854 } else {
855 Ordering::Equal
856 }
857 };
858
859 // Compare Python executables
860 let exe_ordering = || lhs.executable.cmp(&rhs.executable);
861
862 venv_ordering
863 .then_with(proj_ordering)
864 .then_with(priority_ordering)
865 .then_with(conda_ordering)
866 .then_with(exe_ordering)
867 });
868
869 let mut toolchains: Vec<_> = toolchains
870 .into_iter()
871 .filter_map(|toolchain| {
872 let mut name = String::from("Python");
873 if let Some(ref version) = toolchain.version {
874 _ = write!(name, " {version}");
875 }
876
877 let name_and_kind = match (&toolchain.name, &toolchain.kind) {
878 (Some(name), Some(kind)) => {
879 Some(format!("({name}; {})", python_env_kind_display(kind)))
880 }
881 (Some(name), None) => Some(format!("({name})")),
882 (None, Some(kind)) => Some(format!("({})", python_env_kind_display(kind))),
883 (None, None) => None,
884 };
885
886 if let Some(nk) = name_and_kind {
887 _ = write!(name, " {nk}");
888 }
889
890 Some(Toolchain {
891 name: name.into(),
892 path: toolchain.executable.as_ref()?.to_str()?.to_owned().into(),
893 language_name: LanguageName::new("Python"),
894 as_json: serde_json::to_value(toolchain).ok()?,
895 })
896 })
897 .collect();
898 toolchains.dedup();
899 ToolchainList {
900 toolchains,
901 default: None,
902 groups: Default::default(),
903 }
904 }
905 fn term(&self) -> SharedString {
906 self.term.clone()
907 }
908}
909
910pub struct EnvironmentApi<'a> {
911 global_search_locations: Arc<Mutex<Vec<PathBuf>>>,
912 project_env: &'a HashMap<String, String>,
913 pet_env: pet_core::os_environment::EnvironmentApi,
914}
915
916impl<'a> EnvironmentApi<'a> {
917 pub fn from_env(project_env: &'a HashMap<String, String>) -> Self {
918 let paths = project_env
919 .get("PATH")
920 .map(|p| std::env::split_paths(p).collect())
921 .unwrap_or_default();
922
923 EnvironmentApi {
924 global_search_locations: Arc::new(Mutex::new(paths)),
925 project_env,
926 pet_env: pet_core::os_environment::EnvironmentApi::new(),
927 }
928 }
929
930 fn user_home(&self) -> Option<PathBuf> {
931 self.project_env
932 .get("HOME")
933 .or_else(|| self.project_env.get("USERPROFILE"))
934 .map(|home| pet_fs::path::norm_case(PathBuf::from(home)))
935 .or_else(|| self.pet_env.get_user_home())
936 }
937}
938
939impl pet_core::os_environment::Environment for EnvironmentApi<'_> {
940 fn get_user_home(&self) -> Option<PathBuf> {
941 self.user_home()
942 }
943
944 fn get_root(&self) -> Option<PathBuf> {
945 None
946 }
947
948 fn get_env_var(&self, key: String) -> Option<String> {
949 self.project_env
950 .get(&key)
951 .cloned()
952 .or_else(|| self.pet_env.get_env_var(key))
953 }
954
955 fn get_know_global_search_locations(&self) -> Vec<PathBuf> {
956 if self.global_search_locations.lock().is_empty() {
957 let mut paths =
958 std::env::split_paths(&self.get_env_var("PATH".to_string()).unwrap_or_default())
959 .collect::<Vec<PathBuf>>();
960
961 log::trace!("Env PATH: {:?}", paths);
962 for p in self.pet_env.get_know_global_search_locations() {
963 if !paths.contains(&p) {
964 paths.push(p);
965 }
966 }
967
968 let mut paths = paths
969 .into_iter()
970 .filter(|p| p.exists())
971 .collect::<Vec<PathBuf>>();
972
973 self.global_search_locations.lock().append(&mut paths);
974 }
975 self.global_search_locations.lock().clone()
976 }
977}
978
979pub(crate) struct PyLspAdapter {
980 python_venv_base: OnceCell<Result<Arc<Path>, String>>,
981}
982impl PyLspAdapter {
983 const SERVER_NAME: LanguageServerName = LanguageServerName::new_static("pylsp");
984 pub(crate) fn new() -> Self {
985 Self {
986 python_venv_base: OnceCell::new(),
987 }
988 }
989 async fn ensure_venv(delegate: &dyn LspAdapterDelegate) -> Result<Arc<Path>> {
990 let python_path = Self::find_base_python(delegate)
991 .await
992 .context("Could not find Python installation for PyLSP")?;
993 let work_dir = delegate
994 .language_server_download_dir(&Self::SERVER_NAME)
995 .await
996 .context("Could not get working directory for PyLSP")?;
997 let mut path = PathBuf::from(work_dir.as_ref());
998 path.push("pylsp-venv");
999 if !path.exists() {
1000 util::command::new_smol_command(python_path)
1001 .arg("-m")
1002 .arg("venv")
1003 .arg("pylsp-venv")
1004 .current_dir(work_dir)
1005 .spawn()?
1006 .output()
1007 .await?;
1008 }
1009
1010 Ok(path.into())
1011 }
1012 // Find "baseline", user python version from which we'll create our own venv.
1013 async fn find_base_python(delegate: &dyn LspAdapterDelegate) -> Option<PathBuf> {
1014 for path in ["python3", "python"] {
1015 if let Some(path) = delegate.which(path.as_ref()).await {
1016 return Some(path);
1017 }
1018 }
1019 None
1020 }
1021
1022 async fn base_venv(&self, delegate: &dyn LspAdapterDelegate) -> Result<Arc<Path>, String> {
1023 self.python_venv_base
1024 .get_or_init(move || async move {
1025 Self::ensure_venv(delegate)
1026 .await
1027 .map_err(|e| format!("{e}"))
1028 })
1029 .await
1030 .clone()
1031 }
1032}
1033
1034const BINARY_DIR: &str = if cfg!(target_os = "windows") {
1035 "Scripts"
1036} else {
1037 "bin"
1038};
1039
1040#[async_trait(?Send)]
1041impl LspAdapter for PyLspAdapter {
1042 fn name(&self) -> LanguageServerName {
1043 Self::SERVER_NAME.clone()
1044 }
1045
1046 async fn check_if_user_installed(
1047 &self,
1048 delegate: &dyn LspAdapterDelegate,
1049 toolchains: Arc<dyn LanguageToolchainStore>,
1050 cx: &AsyncApp,
1051 ) -> Option<LanguageServerBinary> {
1052 if let Some(pylsp_bin) = delegate.which(Self::SERVER_NAME.as_ref()).await {
1053 let env = delegate.shell_env().await;
1054 Some(LanguageServerBinary {
1055 path: pylsp_bin,
1056 env: Some(env),
1057 arguments: vec![],
1058 })
1059 } else {
1060 let venv = toolchains
1061 .active_toolchain(
1062 delegate.worktree_id(),
1063 Arc::from("".as_ref()),
1064 LanguageName::new("Python"),
1065 &mut cx.clone(),
1066 )
1067 .await?;
1068 let pylsp_path = Path::new(venv.path.as_ref()).parent()?.join("pylsp");
1069 pylsp_path.exists().then(|| LanguageServerBinary {
1070 path: venv.path.to_string().into(),
1071 arguments: vec![pylsp_path.into()],
1072 env: None,
1073 })
1074 }
1075 }
1076
1077 async fn fetch_latest_server_version(
1078 &self,
1079 _: &dyn LspAdapterDelegate,
1080 ) -> Result<Box<dyn 'static + Any + Send>> {
1081 Ok(Box::new(()) as Box<_>)
1082 }
1083
1084 async fn fetch_server_binary(
1085 &self,
1086 _: Box<dyn 'static + Send + Any>,
1087 _: PathBuf,
1088 delegate: &dyn LspAdapterDelegate,
1089 ) -> Result<LanguageServerBinary> {
1090 let venv = self.base_venv(delegate).await.map_err(|e| anyhow!(e))?;
1091 let pip_path = venv.join(BINARY_DIR).join("pip3");
1092 ensure!(
1093 util::command::new_smol_command(pip_path.as_path())
1094 .arg("install")
1095 .arg("python-lsp-server")
1096 .arg("-U")
1097 .output()
1098 .await?
1099 .status
1100 .success(),
1101 "python-lsp-server installation failed"
1102 );
1103 ensure!(
1104 util::command::new_smol_command(pip_path.as_path())
1105 .arg("install")
1106 .arg("python-lsp-server[all]")
1107 .arg("-U")
1108 .output()
1109 .await?
1110 .status
1111 .success(),
1112 "python-lsp-server[all] installation failed"
1113 );
1114 ensure!(
1115 util::command::new_smol_command(pip_path)
1116 .arg("install")
1117 .arg("pylsp-mypy")
1118 .arg("-U")
1119 .output()
1120 .await?
1121 .status
1122 .success(),
1123 "pylsp-mypy installation failed"
1124 );
1125 let pylsp = venv.join(BINARY_DIR).join("pylsp");
1126 Ok(LanguageServerBinary {
1127 path: pylsp,
1128 env: None,
1129 arguments: vec![],
1130 })
1131 }
1132
1133 async fn cached_server_binary(
1134 &self,
1135 _: PathBuf,
1136 delegate: &dyn LspAdapterDelegate,
1137 ) -> Option<LanguageServerBinary> {
1138 let venv = self.base_venv(delegate).await.ok()?;
1139 let pylsp = venv.join(BINARY_DIR).join("pylsp");
1140 Some(LanguageServerBinary {
1141 path: pylsp,
1142 env: None,
1143 arguments: vec![],
1144 })
1145 }
1146
1147 async fn process_completions(&self, _items: &mut [lsp::CompletionItem]) {}
1148
1149 async fn label_for_completion(
1150 &self,
1151 item: &lsp::CompletionItem,
1152 language: &Arc<language::Language>,
1153 ) -> Option<language::CodeLabel> {
1154 let label = &item.label;
1155 let grammar = language.grammar()?;
1156 let highlight_id = match item.kind? {
1157 lsp::CompletionItemKind::METHOD => grammar.highlight_id_for_name("function.method")?,
1158 lsp::CompletionItemKind::FUNCTION => grammar.highlight_id_for_name("function")?,
1159 lsp::CompletionItemKind::CLASS => grammar.highlight_id_for_name("type")?,
1160 lsp::CompletionItemKind::CONSTANT => grammar.highlight_id_for_name("constant")?,
1161 _ => return None,
1162 };
1163 let filter_range = item
1164 .filter_text
1165 .as_deref()
1166 .and_then(|filter| label.find(filter).map(|ix| ix..ix + filter.len()))
1167 .unwrap_or(0..label.len());
1168 Some(language::CodeLabel {
1169 text: label.clone(),
1170 runs: vec![(0..label.len(), highlight_id)],
1171 filter_range,
1172 })
1173 }
1174
1175 async fn label_for_symbol(
1176 &self,
1177 name: &str,
1178 kind: lsp::SymbolKind,
1179 language: &Arc<language::Language>,
1180 ) -> Option<language::CodeLabel> {
1181 let (text, filter_range, display_range) = match kind {
1182 lsp::SymbolKind::METHOD | lsp::SymbolKind::FUNCTION => {
1183 let text = format!("def {}():\n", name);
1184 let filter_range = 4..4 + name.len();
1185 let display_range = 0..filter_range.end;
1186 (text, filter_range, display_range)
1187 }
1188 lsp::SymbolKind::CLASS => {
1189 let text = format!("class {}:", name);
1190 let filter_range = 6..6 + name.len();
1191 let display_range = 0..filter_range.end;
1192 (text, filter_range, display_range)
1193 }
1194 lsp::SymbolKind::CONSTANT => {
1195 let text = format!("{} = 0", name);
1196 let filter_range = 0..name.len();
1197 let display_range = 0..filter_range.end;
1198 (text, filter_range, display_range)
1199 }
1200 _ => return None,
1201 };
1202
1203 Some(language::CodeLabel {
1204 runs: language.highlight_text(&text.as_str().into(), display_range.clone()),
1205 text: text[display_range].to_string(),
1206 filter_range,
1207 })
1208 }
1209
1210 async fn workspace_configuration(
1211 self: Arc<Self>,
1212 _: &dyn Fs,
1213 adapter: &Arc<dyn LspAdapterDelegate>,
1214 toolchains: Arc<dyn LanguageToolchainStore>,
1215 cx: &mut AsyncApp,
1216 ) -> Result<Value> {
1217 let toolchain = toolchains
1218 .active_toolchain(
1219 adapter.worktree_id(),
1220 Arc::from("".as_ref()),
1221 LanguageName::new("Python"),
1222 cx,
1223 )
1224 .await;
1225 cx.update(move |cx| {
1226 let mut user_settings =
1227 language_server_settings(adapter.as_ref(), &Self::SERVER_NAME, cx)
1228 .and_then(|s| s.settings.clone())
1229 .unwrap_or_else(|| {
1230 json!({
1231 "plugins": {
1232 "pycodestyle": {"enabled": false},
1233 "rope_autoimport": {"enabled": true, "memory": true},
1234 "pylsp_mypy": {"enabled": false}
1235 },
1236 "rope": {
1237 "ropeFolder": null
1238 },
1239 })
1240 });
1241
1242 // If user did not explicitly modify their python venv, use one from picker.
1243 if let Some(toolchain) = toolchain {
1244 if user_settings.is_null() {
1245 user_settings = Value::Object(serde_json::Map::default());
1246 }
1247 let object = user_settings.as_object_mut().unwrap();
1248 if let Some(python) = object
1249 .entry("plugins")
1250 .or_insert(Value::Object(serde_json::Map::default()))
1251 .as_object_mut()
1252 {
1253 if let Some(jedi) = python
1254 .entry("jedi")
1255 .or_insert(Value::Object(serde_json::Map::default()))
1256 .as_object_mut()
1257 {
1258 jedi.entry("environment".to_string())
1259 .or_insert_with(|| Value::String(toolchain.path.clone().into()));
1260 }
1261 if let Some(pylint) = python
1262 .entry("pylsp_mypy")
1263 .or_insert(Value::Object(serde_json::Map::default()))
1264 .as_object_mut()
1265 {
1266 pylint.entry("overrides".to_string()).or_insert_with(|| {
1267 Value::Array(vec![
1268 Value::String("--python-executable".into()),
1269 Value::String(toolchain.path.into()),
1270 Value::String("--cache-dir=/dev/null".into()),
1271 Value::Bool(true),
1272 ])
1273 });
1274 }
1275 }
1276 }
1277 user_settings = Value::Object(serde_json::Map::from_iter([(
1278 "pylsp".to_string(),
1279 user_settings,
1280 )]));
1281
1282 user_settings
1283 })
1284 }
1285 fn manifest_name(&self) -> Option<ManifestName> {
1286 Some(SharedString::new_static("pyproject.toml").into())
1287 }
1288 fn workspace_folders_content(&self) -> WorkspaceFoldersContent {
1289 WorkspaceFoldersContent::WorktreeRoot
1290 }
1291}
1292
1293#[cfg(test)]
1294mod tests {
1295 use gpui::{AppContext as _, BorrowAppContext, Context, TestAppContext};
1296 use language::{AutoindentMode, Buffer, language_settings::AllLanguageSettings};
1297 use settings::SettingsStore;
1298 use std::num::NonZeroU32;
1299
1300 #[gpui::test]
1301 async fn test_python_autoindent(cx: &mut TestAppContext) {
1302 cx.executor().set_block_on_ticks(usize::MAX..=usize::MAX);
1303 let language = crate::language("python", tree_sitter_python::LANGUAGE.into());
1304 cx.update(|cx| {
1305 let test_settings = SettingsStore::test(cx);
1306 cx.set_global(test_settings);
1307 language::init(cx);
1308 cx.update_global::<SettingsStore, _>(|store, cx| {
1309 store.update_user_settings::<AllLanguageSettings>(cx, |s| {
1310 s.defaults.tab_size = NonZeroU32::new(2);
1311 });
1312 });
1313 });
1314
1315 cx.new(|cx| {
1316 let mut buffer = Buffer::local("", cx).with_language(language, cx);
1317 let append = |buffer: &mut Buffer, text: &str, cx: &mut Context<Buffer>| {
1318 let ix = buffer.len();
1319 buffer.edit([(ix..ix, text)], Some(AutoindentMode::EachLine), cx);
1320 };
1321
1322 // indent after "def():"
1323 append(&mut buffer, "def a():\n", cx);
1324 assert_eq!(buffer.text(), "def a():\n ");
1325
1326 // preserve indent after blank line
1327 append(&mut buffer, "\n ", cx);
1328 assert_eq!(buffer.text(), "def a():\n \n ");
1329
1330 // indent after "if"
1331 append(&mut buffer, "if a:\n ", cx);
1332 assert_eq!(buffer.text(), "def a():\n \n if a:\n ");
1333
1334 // preserve indent after statement
1335 append(&mut buffer, "b()\n", cx);
1336 assert_eq!(buffer.text(), "def a():\n \n if a:\n b()\n ");
1337
1338 // preserve indent after statement
1339 append(&mut buffer, "else", cx);
1340 assert_eq!(buffer.text(), "def a():\n \n if a:\n b()\n else");
1341
1342 // dedent "else""
1343 append(&mut buffer, ":", cx);
1344 assert_eq!(buffer.text(), "def a():\n \n if a:\n b()\n else:");
1345
1346 // indent lines after else
1347 append(&mut buffer, "\n", cx);
1348 assert_eq!(
1349 buffer.text(),
1350 "def a():\n \n if a:\n b()\n else:\n "
1351 );
1352
1353 // indent after an open paren. the closing paren is not indented
1354 // because there is another token before it on the same line.
1355 append(&mut buffer, "foo(\n1)", cx);
1356 assert_eq!(
1357 buffer.text(),
1358 "def a():\n \n if a:\n b()\n else:\n foo(\n 1)"
1359 );
1360
1361 // dedent the closing paren if it is shifted to the beginning of the line
1362 let argument_ix = buffer.text().find('1').unwrap();
1363 buffer.edit(
1364 [(argument_ix..argument_ix + 1, "")],
1365 Some(AutoindentMode::EachLine),
1366 cx,
1367 );
1368 assert_eq!(
1369 buffer.text(),
1370 "def a():\n \n if a:\n b()\n else:\n foo(\n )"
1371 );
1372
1373 // preserve indent after the close paren
1374 append(&mut buffer, "\n", cx);
1375 assert_eq!(
1376 buffer.text(),
1377 "def a():\n \n if a:\n b()\n else:\n foo(\n )\n "
1378 );
1379
1380 // manually outdent the last line
1381 let end_whitespace_ix = buffer.len() - 4;
1382 buffer.edit(
1383 [(end_whitespace_ix..buffer.len(), "")],
1384 Some(AutoindentMode::EachLine),
1385 cx,
1386 );
1387 assert_eq!(
1388 buffer.text(),
1389 "def a():\n \n if a:\n b()\n else:\n foo(\n )\n"
1390 );
1391
1392 // preserve the newly reduced indentation on the next newline
1393 append(&mut buffer, "\n", cx);
1394 assert_eq!(
1395 buffer.text(),
1396 "def a():\n \n if a:\n b()\n else:\n foo(\n )\n\n"
1397 );
1398
1399 // reset to a simple if statement
1400 buffer.edit([(0..buffer.len(), "if a:\n b(\n )")], None, cx);
1401
1402 // dedent "else" on the line after a closing paren
1403 append(&mut buffer, "\n else:\n", cx);
1404 assert_eq!(buffer.text(), "if a:\n b(\n )\nelse:\n ");
1405
1406 buffer
1407 });
1408 }
1409}