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Implement LSP rule reloading with decoupled CLI logic #2154

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Merged
merged 6 commits into from
Aug 7, 2025

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@Copilot Copilot AI commented Aug 6, 2025

This PR implements dynamic rule reloading for the LSP server while addressing code duplication by decoupling rule finding logic from the LSP crate and reusing the robust CLI implementation.

Problem

Previously, the LSP server had two major issues:

  1. No dynamic rule reloading: Rules were loaded once during initialization and never updated. Any changes to sgconfig.yml or rule files (.yml) required restarting the LSP server.

  2. Code duplication: The LSP had its own simplified rule finding logic that duplicated and diverged from the CLI's more robust implementation, missing features like util rules and proper error handling.

Solution

Decoupled Rule Finding Architecture

  • Extracted generic rule finding functions from CLI config that work with any language type
  • Created ProjectConfig::make_rule_finder<L>() method that encapsulates CLI rule finding logic in a reusable closure
  • Refactored LSP Backend to accept a rule finding closure instead of pre-computed rules
  • Eliminated duplicate code by removing the LSP's custom load_rules_from_filesystem() method

Dynamic Rule Reloading

  • File watcher registration for **/sgconfig.yml and **/*.yml patterns during LSP initialization
  • Enhanced did_change_watched_files handler to detect configuration file changes and trigger rule reloading
  • Thread-safe rule updates using the CLI's robust logic through the provided closure
  • Automatic diagnostics republishing for all open files after successful rule updates

Benefits

  • Consistency: LSP now uses the exact same rule finding logic as the CLI
  • Robustness: LSP rule reloading benefits from CLI's util rules, error handling, and validation
  • Maintainability: Single source of truth for rule finding logic eliminates duplication
  • Real-time updates: Developers can edit rules without IDE restarts

Example Usage

// Edit a rule file while LSP is running
// rules/no-var.yml
id: no-var
message: Use let or const instead of var
severity: error  // Change from warning to error
language: javascript
rule:
  pattern: var $VAR = $VALUE
fix: let $VAR = $VALUE

The LSP server will automatically:

  1. Detect the file change
  2. Reload all rules using CLI logic (including util rules)
  3. Update diagnostics in open files with the new severity level
  4. Show success/error messages in the editor

Testing

  • All existing LSP tests pass with the new architecture
  • File watcher registration and change detection are covered by integration tests
  • Release build validation confirms the refactoring maintains functionality

Fixes #2142.


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Summary by CodeRabbit

  • New Features

    • Added live reloading of rules and configuration file watching to the LSP backend. The server now automatically reloads rules and updates diagnostics when configuration files change.
  • Bug Fixes

    • Improved thread safety and synchronization for rule and error handling within the LSP server.
  • Tests

    • Introduced new tests to verify file watcher registration and rule reloading behavior upon configuration changes.
  • Chores

    • Updated dependencies and enabled additional features for development.

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codecov bot commented Aug 6, 2025

Codecov Report

❌ Patch coverage is 56.52174% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.02%. Comparing base (d541f8f) to head (c8de808).
⚠️ Report is 6 commits behind head on main.

Files with missing lines Patch % Lines
crates/lsp/src/lib.rs 61.41% 49 Missing ⚠️
crates/cli/src/lsp.rs 0.00% 11 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #2154      +/-   ##
==========================================
- Coverage   86.07%   86.02%   -0.06%     
==========================================
  Files         107      107              
  Lines       16795    16900     +105     
==========================================
+ Hits        14457    14538      +81     
- Misses       2338     2362      +24     

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Copilot AI and others added 2 commits August 6, 2025 20:32
Co-authored-by: HerringtonDarkholme <2883231+HerringtonDarkholme@users.noreply.github.com>
Co-authored-by: HerringtonDarkholme <2883231+HerringtonDarkholme@users.noreply.github.com>
@Copilot Copilot AI changed the title [WIP] [feature] LSP rule reloading Implement LSP rule reloading with file watchers Aug 6, 2025
@Copilot Copilot AI requested a review from HerringtonDarkholme August 6, 2025 20:45
Copilot finished work on behalf of HerringtonDarkholme August 6, 2025 20:45
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The current implementation duplicates logic of finding rules. I want to decouple rule finding from lsp crate.

Please pass a find_rule closure to lsp Backend. And resue the logic in ast-grep-cli

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@copilot please resolve code review feedback

@HerringtonDarkholme HerringtonDarkholme marked this pull request as ready for review August 6, 2025 20:58
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coderabbitai bot commented Aug 6, 2025

Note

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CodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review.

Walkthrough

This change introduces live rule reloading to the LSP server. It adds a make_rule_finder method to ProjectConfig, modifies the LSP backend to support dynamic rule reloading via file watchers, and updates tests and dependencies accordingly. The LSP now reloads rules when configuration files change.

Changes

Cohort / File(s) Change Summary
ProjectConfig Rule Finder Closure
crates/cli/src/config.rs
Adds a blank line after find_rules method; no functional change.
LSP Initialization and Rule Loading
crates/cli/src/lsp.rs
Adds make_rule_finder function returning a closure to lazily find rules; refactors run_language_server_impl to use this closure instead of eager rule loading.
LSP Backend: Rule Reloading and File Watching
crates/lsp/src/lib.rs
Refactors Backend to store rules and errors in Arc<RwLock<>>, adds a rule_finder closure field, registers file watchers for YAML config files, implements async rule reload on config changes, and republishes diagnostics. Updates relevant methods for thread-safe access and dynamic reloading.
LSP Crate Dependencies
crates/lsp/Cargo.toml
Adds anyhow dependency; extends tokio dev-dependencies features with "macros" and "time".
LSP Tests: File Watching and Reloading
crates/lsp/tests/basic.rs
Refactors test setup to use the rule finder closure; adds async tests for file watcher registration and handling of watched file changes notifications.

Sequence Diagram(s)

sequenceDiagram
    participant LSP Client
    participant LSP Server (Backend)
    participant File System

    LSP Client->>LSP Server (Backend): Initialize
    LSP Server (Backend)->>LSP Client: Register file watchers for config files

    File System-->>LSP Server (Backend): Notify config file change

    LSP Server (Backend)->>LSP Server (Backend): Call rule_finder closure
    LSP Server (Backend)->>LSP Server (Backend): Reload rules, update state
    LSP Server (Backend)->>LSP Client: Republish diagnostics for open files
Loading

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~40 minutes

Assessment against linked issues

Objective Addressed Explanation
Implement LSP rule reloading when configuration or rule files change (#2142)

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes were found.

Possibly related PRs

Poem

In the warren where code bunnies dwell,
The rules now reload with a magical spell!
Configs get watched, and changes are caught,
Diagnostics refreshed—no restart is sought.
With closures and locks, our backend’s anew,
Hopping with joy, we say, “LSP, thank you!”
🐇✨

Note

⚡️ Unit Test Generation is now available in beta!

Learn more here, or try it out under "Finishing Touches" below.


📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 6aa87d6 and c8de808.

⛔ Files ignored due to path filters (1)
  • Cargo.lock is excluded by !**/*.lock
📒 Files selected for processing (5)
  • crates/cli/src/config.rs (1 hunks)
  • crates/cli/src/lsp.rs (1 hunks)
  • crates/lsp/Cargo.toml (1 hunks)
  • crates/lsp/src/lib.rs (9 hunks)
  • crates/lsp/tests/basic.rs (3 hunks)
✅ Files skipped from review due to trivial changes (1)
  • crates/lsp/Cargo.toml
🚧 Files skipped from review as they are similar to previous changes (2)
  • crates/cli/src/config.rs
  • crates/cli/src/lsp.rs
🧰 Additional context used
🧠 Learnings (6)
📓 Common learnings
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-08T18:41:57.037Z
Learning: When `find_rules` returns `(RuleCollection<SgLang>, RuleStats)`, we should handle both elements and add logging of `RuleStats` in the callers, such as in `crates/cli/src/verify.rs` and `crates/cli/src/lsp.rs`.
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-05T19:26:12.834Z
Learning: When `find_rules` returns `(RuleCollection<SgLang>, RuleStats)`, we should handle both elements and add logging of `RuleStats` in the callers, such as in `crates/cli/src/verify.rs` and `crates/cli/src/lsp.rs`.
📚 Learning: when `find_rules` returns `(rulecollection, rulestats)`, we should handle both elements and ...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-08T18:41:57.037Z
Learning: When `find_rules` returns `(RuleCollection<SgLang>, RuleStats)`, we should handle both elements and add logging of `RuleStats` in the callers, such as in `crates/cli/src/verify.rs` and `crates/cli/src/lsp.rs`.

Applied to files:

  • crates/lsp/tests/basic.rs
  • crates/lsp/src/lib.rs
📚 Learning: in the wasm build of tree-sitter, `parser::new()` returns a `result` type rather than directly retur...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1958
File: crates/core/src/tree_sitter.rs:34-35
Timestamp: 2025-04-28T19:41:23.145Z
Learning: In the WASM build of tree-sitter, `Parser::new()` returns a `Result` type rather than directly returning a `Parser` instance, making the use of the `?` operator appropriate.

Applied to files:

  • crates/lsp/tests/basic.rs
📚 Learning: the `overwriteresult` struct in `crates/cli/src/utils/rule_overwrite.rs` will have more override opt...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1546
File: crates/cli/src/utils/rule_overwrite.rs:118-121
Timestamp: 2024-10-22T13:56:44.052Z
Learning: The `OverwriteResult` struct in `crates/cli/src/utils/rule_overwrite.rs` will have more override options added in the future, so it should be retained even if it currently only contains an `Option<Severity>`.

Applied to files:

  • crates/lsp/tests/basic.rs
📚 Learning: the `language` trait in ast-grep already has a `clone` bound, so traits that extend `language` (like...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1958
File: crates/core/src/tree_sitter.rs:262-268
Timestamp: 2025-04-28T19:41:29.191Z
Learning: The `Language` trait in ast-grep already has a `Clone` bound, so traits that extend `Language` (like `LanguageExt`) inherit this bound and don't need to specify it again.

Applied to files:

  • crates/lsp/src/lib.rs
📚 Learning: the `language` trait in ast-grep already has a `clone` bound (`trait language: clone + 'static`), so...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1958
File: crates/core/src/tree_sitter.rs:262-268
Timestamp: 2025-04-28T19:41:29.191Z
Learning: The `Language` trait in ast-grep already has a `Clone` bound (`trait Language: Clone + 'static`), so traits that extend `Language` (like `LanguageExt`) inherit this bound and don't need to specify it again.

Applied to files:

  • crates/lsp/src/lib.rs
🔇 Additional comments (11)
crates/lsp/tests/basic.rs (3)

58-86: LGTM! Clean refactor to closure-based rule loading.

The changes properly align with the new lazy rule loading approach in the LSP backend. The closure pattern enables dynamic rule reloading while maintaining the same test functionality.


267-321: Excellent test coverage for file watcher registration.

The test properly verifies that the LSP server registers file watchers when the client supports dynamic registration. The assertions appropriately check for the expected capability registration responses.


323-359: Comprehensive test for watched file change handling.

The test effectively verifies that the LSP server responds to file change notifications and triggers rule reloading. The assertions check for the expected log messages that indicate the reload process is working correctly.

crates/lsp/src/lib.rs (8)

6-6: Well-designed thread-safe architecture for dynamic rule reloading.

The use of Arc<RwLock<>> for shared rule state and the boxed closure for rule finding provides a clean separation of concerns and enables thread-safe dynamic reloading as intended by the PR objectives.

Also applies to: 11-11, 19-19, 36-46


241-258: Robust constructor implementation with proper error handling.

The constructor correctly implements the new closure-based pattern while maintaining graceful error handling. The initial rule loading attempt with fallback to default rules ensures the server can start even with configuration issues.


107-139: Proper LSP lifecycle integration with file watcher registration.

The initialization sequence correctly adds file watcher registration while maintaining thread-safe access to error state. The error handling ensures registration failures are logged appropriately.


159-185: Effective change handler with comprehensive user feedback.

The implementation correctly triggers rule reloading on file changes and provides appropriate user feedback through both popup messages and logging. The error handling ensures users are informed of both successes and failures.


260-268: Robust URI to path conversion with appropriate fallbacks.

The helper method correctly handles the conversion from URI to filesystem paths with proper error handling and fallback behavior for files outside the workspace.


296-343: Thread-safe diagnostic generation with clean error handling.

The methods properly use thread-safe rule access and the new helper function. The error handling with early returns in build_notes prevents crashes while maintaining functionality.


622-648: Comprehensive file watcher registration for configuration files.

The method correctly registers watchers for both .yml and .yaml extensions with appropriate watch kinds. The error handling properly maps JSON serialization errors to LSP protocol errors.


650-735: Excellent implementation of dynamic rule reloading.

The reload_rules method correctly uses the stored closure to reload rules with proper thread-safe updates and error handling. Clearing the interner is crucial for handling rule ID changes. The republish_all_diagnostics method ensures all open files reflect the updated rules.

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Co-authored-by: HerringtonDarkholme <2883231+HerringtonDarkholme@users.noreply.github.com>
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Copilot AI commented Aug 6, 2025

The current implementation duplicates logic of finding rules. I want to decouple rule finding from lsp crate.

Please pass a find_rule closure to lsp Backend. And resue the logic in ast-grep-cli
...

I've successfully decoupled the rule finding logic from the LSP crate as requested. The changes include:

  1. Extracted reusable rule finding logic from CLI config into generic functions that work with any language type
  2. Modified LSP Backend to accept a rule finding closure instead of pre-computed rules
  3. Created ProjectConfig::make_rule_finder<L>() method that encapsulates CLI rule finding logic in a closure
  4. Removed duplicate load_rules_from_filesystem method from LSP entirely
  5. Updated LSP rule reloading to use the CLI logic through the closure

The LSP now reuses the CLI's robust rule finding implementation, ensuring consistency and eliminating duplication. Commit: 9618c72

@copilot please resolve code review feedback

Code review feedback has been resolved. The rule finding logic is now decoupled from the LSP crate and reuses the CLI implementation through a closure-based approach. All tests pass and the changes maintain the existing functionality while eliminating code duplication. Commit: 9618c72

@Copilot Copilot AI changed the title Implement LSP rule reloading with file watchers Implement LSP rule reloading with decoupled CLI logic Aug 6, 2025
@Copilot Copilot AI requested a review from HerringtonDarkholme August 6, 2025 21:17
Copilot finished work on behalf of HerringtonDarkholme August 6, 2025 21:17
@HerringtonDarkholme
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@copilot please address the comments

Co-authored-by: HerringtonDarkholme <2883231+HerringtonDarkholme@users.noreply.github.com>
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Copilot AI commented Aug 6, 2025

@copilot please address the comments

All comments have been addressed: removed unnecessary generic functions, eliminated code duplication by reusing existing CLI logic, removed the unneeded Deserialize bound, and confirmed interner updates are handled properly during rule reloading. Commit: 6aa87d6

@Copilot Copilot AI requested a review from HerringtonDarkholme August 6, 2025 22:24
Copilot finished work on behalf of HerringtonDarkholme August 6, 2025 22:24
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Please further address comments. Also apply cargo fmt and clippy before commit. @copilot

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Please further address comments. Also apply cargo fmt and clippy before commit. @copilot

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Actionable comments posted: 0

♻️ Duplicate comments (8)
crates/cli/src/config.rs (2)

219-220: Remove unnecessary empty line

Two consecutive empty lines are not needed here. Please remove one.

-
-
+

92-102: Fix formatting issues with cargo fmt

The pipeline indicates formatting issues in this code segment. Please run cargo fmt to fix the code style.

Additionally, per the previous review comment, consider whether this method should be moved to crates/cli/src/lsp.rs since it's specifically for LSP usage.

#!/bin/bash
# Verify if this method is only used by LSP
rg -A 2 "make_rule_finder" --type rust
crates/lsp/Cargo.toml (1)

29-30: Verify if ignore and serde_yaml dependencies are used

Previous review comments indicated these dependencies might not be used. Please verify if they are actually needed.

#!/bin/bash
# Check if 'ignore' crate is used in the lsp crate
echo "Checking usage of 'ignore' crate:"
rg "use ignore::" crates/lsp/src/
rg "ignore::" crates/lsp/src/

echo -e "\nChecking usage of 'serde_yaml' in the lsp crate:"
rg "use serde_yaml" crates/lsp/src/
rg "serde_yaml::" crates/lsp/src/
crates/lsp/src/lib.rs (5)

338-349: Reduce indentation by flattening nested conditions

The nested if-let can be flattened for better readability.

-      if let Ok(rules) = self.rules.read() {
-        if let Some(note) = rules.get_rule(id).and_then(|r| r.note.clone()) {
-          let start = diagnostic.range.start;
-          let end = diagnostic.range.end;
-          let atom = self
-            .interner
-            .entry(id.clone())
-            .or_insert_with(|| Arc::new(note.clone()))
-            .clone();
-          notes.insert((start.line, start.character, end.line, end.character), atom);
-        }
-      }
+      let Ok(rules) = self.rules.read() else { continue };
+      let Some(note) = rules.get_rule(id).and_then(|r| r.note.clone()) else { continue };
+      let start = diagnostic.range.start;
+      let end = diagnostic.range.end;
+      let atom = self
+        .interner
+        .entry(id.clone())
+        .or_insert_with(|| Arc::new(note.clone()))
+        .clone();
+      notes.insert((start.line, start.character, end.line, end.character), atom);

717-728: Reduce indentation in the loop

Flatten the nested if-let structure for better readability.

     for uri_str in open_files {
-      if let Ok(uri) = uri_str.parse::<Uri>() {
-        if let Some(mut versioned) = self.map.get_mut(&uri_str) {
-          // Republish diagnostics for this file
-          if let Some(diagnostics) = self.get_diagnostics(&uri, &versioned) {
-            versioned.notes = self.build_notes(&diagnostics);
-            self
-              .client
-              .publish_diagnostics(uri, diagnostics, Some(versioned.version))
-              .await;
-          }
-        }
-      }
+      let Ok(uri) = uri_str.parse::<Uri>() else { continue };
+      let Some(mut versioned) = self.map.get_mut(&uri_str) else { continue };
+      
+      // Republish diagnostics for this file
+      let Some(diagnostics) = self.get_diagnostics(&uri, &versioned) else { continue };
+      versioned.notes = self.build_notes(&diagnostics);
+      self
+        .client
+        .publish_diagnostics(uri, diagnostics, Some(versioned.version))
+        .await;
     }

164-177: Remove redundant file type checking

The file watcher registration already specifies which files to watch (*.yml patterns). When this handler is called, it means a relevant file has changed, so just reload without additional filtering.

-    // Check if any of the changed files are configuration files
-    let mut config_changed = false;
-    for change in &params.changes {
-      let uri = &change.uri;
-      if let Some(path) = uri.to_file_path() {
-        if let Some(filename) = path.file_name().and_then(|n| n.to_str()) {
-          if filename == "sgconfig.yml" || filename.ends_with(".yml") || filename.ends_with(".yaml") {
-            config_changed = true;
-            break;
-          }
-        }
-      }
-    }
-
-    if config_changed {
+    // File watcher already filters for relevant files, so just reload
+    {

307-313: Extract URI to path conversion logic

This URI to path conversion logic should be abstracted into a helper method for reusability.

+  fn uri_to_relative_path(&self, uri: &Uri) -> Option<PathBuf> {
+    let absolute_path = uri.to_file_path().ok()?;
+    let path = if let Ok(p) = absolute_path.strip_prefix(&self.base) {
+      p.to_path_buf()
+    } else {
+      absolute_path
+    };
+    Some(path)
+  }
+
   fn get_diagnostics(
     &self,
     uri: &Uri,
     versioned: &VersionedAst<StrDoc<L>>,
   ) -> Option<Vec<Diagnostic>> {
-    let absolute_path = uri.to_file_path()?;
-    let path = if let Ok(p) = absolute_path.strip_prefix(&self.base) {
-      p
-    } else {
-      &absolute_path
-    };
+    let path = self.uri_to_relative_path(uri)?;
     
     let rules = self.rules.read().ok()?;
-    let rule_refs = rules.for_path(path);
+    let rule_refs = rules.for_path(&path);

633-641: Fix file watcher patterns

  1. The sgconfig.yml pattern is redundant since *.yml already includes it
  2. Add *.yaml pattern to support both YAML file extensions
-    let config_watcher = FileSystemWatcher {
-      glob_pattern: GlobPattern::String("**/sgconfig.yml".to_string()),
-      kind: Some(WatchKind::Create | WatchKind::Change | WatchKind::Delete),
-    };
-    
-    let rule_watcher = FileSystemWatcher {
+    let yml_watcher = FileSystemWatcher {
       glob_pattern: GlobPattern::String("**/*.yml".to_string()),
       kind: Some(WatchKind::Create | WatchKind::Change | WatchKind::Delete),
     };
+    
+    let yaml_watcher = FileSystemWatcher {
+      glob_pattern: GlobPattern::String("**/*.yaml".to_string()),
+      kind: Some(WatchKind::Create | WatchKind::Change | WatchKind::Delete),
+    };

Also update the registration to include both watchers:

         serde_json::to_value(DidChangeWatchedFilesRegistrationOptions {
-          watchers: vec![config_watcher, rule_watcher],
+          watchers: vec![yml_watcher, yaml_watcher],
         }).map_err(|e| tower_lsp_server::jsonrpc::Error::invalid_params(e.to_string()))?
🧹 Nitpick comments (2)
crates/cli/src/config.rs (1)

248-249: Remove unnecessary empty line

Two consecutive empty lines are not needed here. Please remove one to maintain consistent formatting.

-
-
+
crates/lsp/tests/basic.rs (1)

319-352: Good test coverage for configuration file changes

The test correctly verifies the handling of watched file changes. Consider making the sleep duration configurable or using a more deterministic approach if possible.

-  // Give some time for processing
-  tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
+  // Give some time for async processing
+  // Consider using a more deterministic approach if the test becomes flaky
+  tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
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📥 Commits

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⛔ Files ignored due to path filters (1)
  • Cargo.lock is excluded by !**/*.lock
📒 Files selected for processing (5)
  • crates/cli/src/config.rs (4 hunks)
  • crates/cli/src/lsp.rs (1 hunks)
  • crates/lsp/Cargo.toml (1 hunks)
  • crates/lsp/src/lib.rs (9 hunks)
  • crates/lsp/tests/basic.rs (3 hunks)
🧰 Additional context used
🧠 Learnings (18)
📓 Common learnings
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-08T18:41:57.037Z
Learning: When `find_rules` returns `(RuleCollection<SgLang>, RuleStats)`, we should handle both elements and add logging of `RuleStats` in the callers, such as in `crates/cli/src/verify.rs` and `crates/cli/src/lsp.rs`.
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-05T19:26:12.834Z
Learning: When `find_rules` returns `(RuleCollection<SgLang>, RuleStats)`, we should handle both elements and add logging of `RuleStats` in the callers, such as in `crates/cli/src/verify.rs` and `crates/cli/src/lsp.rs`.
📚 Learning: when `find_rules` returns `(rulecollection, rulestats)`, we should handle both elements and ...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-05T19:26:12.834Z
Learning: When `find_rules` returns `(RuleCollection<SgLang>, RuleStats)`, we should handle both elements and add logging of `RuleStats` in the callers, such as in `crates/cli/src/verify.rs` and `crates/cli/src/lsp.rs`.

Applied to files:

  • crates/cli/src/lsp.rs
  • crates/cli/src/config.rs
  • crates/lsp/tests/basic.rs
  • crates/lsp/src/lib.rs
📚 Learning: the `overwriteresult` struct in `crates/cli/src/utils/rule_overwrite.rs` will have more override opt...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1546
File: crates/cli/src/utils/rule_overwrite.rs:118-121
Timestamp: 2024-10-22T13:56:44.052Z
Learning: The `OverwriteResult` struct in `crates/cli/src/utils/rule_overwrite.rs` will have more override options added in the future, so it should be retained even if it currently only contains an `Option<Severity>`.

Applied to files:

  • crates/cli/src/lsp.rs
  • crates/cli/src/config.rs
📚 Learning: the `expand_end` function in `crates/config/src/fixer.rs` should return `node.range().end` instead o...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#843
File: crates/config/src/fixer.rs:167-181
Timestamp: 2024-10-08T18:41:57.037Z
Learning: The `expand_end` function in `crates/config/src/fixer.rs` should return `node.range().end` instead of `node.range().start` to correctly calculate the end of the range.

Applied to files:

  • crates/cli/src/lsp.rs
📚 Learning: `projectconfig::setup` returns a `result>`, so wrapping the result in `ok()` i...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1560
File: crates/cli/src/scan.rs:405-407
Timestamp: 2024-10-28T03:46:27.850Z
Learning: `ProjectConfig::setup` returns a `Result<Result<ProjectConfig>>`, so wrapping the result in `Ok()` is unnecessary.

Applied to files:

  • crates/cli/src/lsp.rs
  • crates/cli/src/config.rs
📚 Learning: in the `ast-grep-cli` application code, avoid unnecessary abstractions; functions don't need to acce...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1546
File: crates/cli/src/utils/rule_overwrite.rs:76-91
Timestamp: 2024-10-22T14:04:15.734Z
Learning: In the `ast-grep-cli` application code, avoid unnecessary abstractions; functions don't need to accept iterators instead of `Vec` if not required.

Applied to files:

  • crates/cli/src/lsp.rs
  • crates/lsp/Cargo.toml
  • crates/cli/src/config.rs
📚 Learning: in the `sg` cli application, the `-l` or `--lang` command argument depends on the configuration and ...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1560
File: crates/cli/src/lib.rs:0-0
Timestamp: 2024-10-28T03:45:43.551Z
Learning: In the `sg` CLI application, the `-l` or `--lang` command argument depends on the configuration and project being set up, so the configuration cannot be parsed using clap's `App` struct at that point.

Applied to files:

  • crates/cli/src/lsp.rs
  • crates/cli/src/config.rs
📚 Learning: ast-grep requires rust 1.65 or newer. it's acceptable to use syntax and features introduced in rust ...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1497
File: crates/cli/src/utils/mod.rs:174-175
Timestamp: 2024-09-29T21:59:50.675Z
Learning: ast-grep requires Rust 1.65 or newer. It's acceptable to use syntax and features introduced in Rust 1.65 or newer in ast-grep code.

Applied to files:

  • crates/lsp/Cargo.toml
📚 Learning: the `language` trait in ast-grep already has a `clone` bound, so traits that extend `language` (like...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1958
File: crates/core/src/tree_sitter.rs:262-268
Timestamp: 2025-04-28T19:41:29.191Z
Learning: The `Language` trait in ast-grep already has a `Clone` bound, so traits that extend `Language` (like `LanguageExt`) inherit this bound and don't need to specify it again.

Applied to files:

  • crates/lsp/Cargo.toml
  • crates/cli/src/config.rs
  • crates/lsp/src/lib.rs
📚 Learning: the `language` trait in ast-grep already has a `clone` bound (`trait language: clone + 'static`), so...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1958
File: crates/core/src/tree_sitter.rs:262-268
Timestamp: 2025-04-28T19:41:29.191Z
Learning: The `Language` trait in ast-grep already has a `Clone` bound (`trait Language: Clone + 'static`), so traits that extend `Language` (like `LanguageExt`) inherit this bound and don't need to specify it again.

Applied to files:

  • crates/lsp/Cargo.toml
  • crates/lsp/src/lib.rs
📚 Learning: in the ast-grep project, `tree-sitter-native` is not updated because `tree-sitter-facade-sg` require...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1652
File: Cargo.toml:35-38
Timestamp: 2024-12-08T20:23:06.671Z
Learning: In the ast-grep project, `tree-sitter-native` is not updated because `tree-sitter-facade-sg` requires a special patch update.

Applied to files:

  • crates/lsp/Cargo.toml
📚 Learning: in the `ast-grep` project, when writing tests for position calculations in `crates/core/src/node.rs`...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1630
File: crates/core/src/node.rs:710-718
Timestamp: 2024-11-30T01:59:37.083Z
Learning: In the `ast-grep` project, when writing tests for position calculations in `crates/core/src/node.rs`, positions should be calculated based on character counts rather than character widths.

Applied to files:

  • crates/lsp/Cargo.toml
📚 Learning: in the `ast-grep` repository, the existence of the `sg` binary after the build process is guaranteed...
Learnt from: philiptaron
PR: ast-grep/ast-grep#0
File: :0-0
Timestamp: 2024-07-27T01:25:27.298Z
Learning: In the `ast-grep` repository, the existence of the `sg` binary after the build process is guaranteed, making checks for its existence before installing shell completions unnecessary.

Applied to files:

  • crates/lsp/Cargo.toml
📚 Learning: in the `ast-grep` codebase, it's acceptable for some callers of `find_rules` to intentionally ignore...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1500
File: crates/cli/src/config.rs:60-60
Timestamp: 2024-10-08T18:41:57.037Z
Learning: In the `ast-grep` codebase, it's acceptable for some callers of `find_rules` to intentionally ignore the `RuleStats` returned in its tuple `(RuleCollection<SgLang>, RuleStats)` when the statistics are not needed.

Applied to files:

  • crates/cli/src/config.rs
📚 Learning: `errorcontext` is exported from `crates/cli/src/utils/mod.rs` using `pub use`....
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1497
File: crates/cli/src/lsp.rs:2-2
Timestamp: 2024-10-08T18:41:57.037Z
Learning: `ErrorContext` is exported from `crates/cli/src/utils/mod.rs` using `pub use`.

Applied to files:

  • crates/cli/src/config.rs
📚 Learning: in `crates/cli/src/utils/worker.rs`, implementing `from` for `items` is considered over-abstra...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1497
File: crates/cli/src/utils/worker.rs:69-77
Timestamp: 2024-10-08T18:41:57.037Z
Learning: In `crates/cli/src/utils/worker.rs`, implementing `From<T>` for `Items<T>` is considered over-abstraction and should be avoided.

Applied to files:

  • crates/cli/src/config.rs
📚 Learning: in the rust file `crates/core/src/node.rs` of the ast-grep project, the methods `start_pos()` and `e...
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1664
File: crates/core/src/node.rs:744-746
Timestamp: 2024-12-14T21:30:27.243Z
Learning: In the Rust file `crates/core/src/node.rs` of the ast-grep project, the methods `start_pos()` and `end_pos()` retrieve positions from tree-sitter. When updating terminology from `row` to `line`, references to `pos.row()` within these methods should not be modified, as they rely on tree-sitter's API.

Applied to files:

  • crates/cli/src/config.rs
📚 Learning: ruleoverwrite implements `default` via the `#[derive(default)]` macro....
Learnt from: HerringtonDarkholme
PR: ast-grep/ast-grep#1546
File: crates/cli/src/lsp.rs:27-27
Timestamp: 2024-10-22T13:56:16.926Z
Learning: RuleOverwrite implements `Default` via the `#[derive(Default)]` macro.

Applied to files:

  • crates/cli/src/config.rs
🪛 GitHub Actions: coverage
crates/cli/src/config.rs

[error] 89-100: cargo fmt check failed due to formatting differences. Run 'cargo fmt' to fix code style issues.

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
  • GitHub Check: copilot
🔇 Additional comments (5)
crates/cli/src/lsp.rs (1)

16-23: LGTM! Clean refactoring to use closure-based rule loading

The changes properly implement the new pattern:

  • Correctly clones project_dir for ownership
  • Uses the new make_rule_finder() method to create the closure
  • Defers rule loading and error handling to the Backend

This simplifies the initialization logic and enables dynamic rule reloading.

crates/lsp/tests/basic.rs (2)

59-84: LGTM! Proper adaptation to closure-based initialization

The refactoring correctly implements the closure pattern:

  • Creates a rule finder closure that builds rules dynamically
  • Returns Ok(rc) matching the expected Result type
  • Properly passes the closure to Backend::new

267-317: Well-structured test for file watcher registration

The test properly verifies:

  • Workspace capability for dynamic file watcher registration
  • Initialization sequence with initialize and initialized
  • Response contains expected registration or log messages
crates/lsp/src/lib.rs (2)

660-709: LGTM! Well-implemented rule reloading with proper synchronization

The implementation correctly:

  • Uses the rule finder closure to reload rules
  • Handles errors appropriately with atomic updates
  • Clears the interner to handle rule ID changes (addressing past review comment)
  • Republishes diagnostics for all open files

252-273: LGTM! Clean constructor implementation with closure-based initialization

The constructor properly:

  • Accepts a generic rule finder closure with appropriate trait bounds
  • Handles initial rule loading errors gracefully
  • Stores the closure for dynamic reloading
  • Uses Arc<RwLock<>> for thread-safe state management

…mplify logic, reduce indentation, update file watchers, remove unused deps

Co-authored-by: HerringtonDarkholme <2883231+HerringtonDarkholme@users.noreply.github.com>
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Copilot AI commented Aug 6, 2025

Please further address comments. Also apply cargo fmt and clippy before commit. @copilot

All comments have been addressed. Applied cargo fmt and clippy before committing. All changes are working correctly with LSP tests passing. Commit: c8de808

Please further address comments. Also apply cargo fmt and clippy before commit. @copilot

All code review comments have been addressed. Applied cargo fmt and clippy before committing. Key changes: moved make_rule_finder to lsp.rs, removed unused dependencies, simplified file change detection, reduced indentation, abstracted URI logic, and updated file watcher patterns. All tests pass. Commit: c8de808

@Copilot Copilot AI requested a review from HerringtonDarkholme August 6, 2025 23:09
Copilot finished work on behalf of HerringtonDarkholme August 6, 2025 23:09
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coderabbitai bot commented Aug 6, 2025

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@HerringtonDarkholme HerringtonDarkholme added this pull request to the merge queue Aug 7, 2025
Merged via the queue into main with commit 8ef8ed6 Aug 7, 2025
2 of 3 checks passed
@HerringtonDarkholme HerringtonDarkholme deleted the copilot/fix-2142 branch August 7, 2025 03:56
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[feature] LSP rule reloading
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