Support indexing a file in the context of multiple targets

Contributor Documentation/BSP Extensions.md

@@ -22,7 +22,7 @@ export interface SourceKitInitializeBuildResponseData {
    * for `swiftc` or `clang` invocations **/
   indexStorePath?: string;
 
-  /** Whether the server implements the `buildTarget/outputPaths` request. */
+  /** Whether the server set the `outputPath` property in the `buildTarget/sources` request */
   outputPathsProvider?: bool;
 
   /** Whether the build server supports the `buildTarget/prepare` request */
@@ -46,37 +46,6 @@ If `data` contains a string value for the `workDoneProgressTitle` key, then the
 
 `changes` can be `null` to indicate that all targets have changed.
 
-## `buildTarget/outputPaths`
-
-For all the source files in this target, the output paths that are used during indexing, ie. the `-index-unit-output-path` for the file, if it is specified in the compiler arguments or the file that is passed as `-o`, if `-index-unit-output-path` is not specified.
-
-This allows SourceKit-LSP to remove index entries for source files that are removed from a target but remain present on disk.
-
-The server communicates during the initialize handshake whether this method is supported or not by setting `outputPathsProvider: true` in `SourceKitInitializeBuildResponseData`.
-
-- method: `buildTarget/outputPaths`
-- params: `OutputPathsParams`
-- result: `OutputPathsResult`
-
-```ts
-export interface BuildTargetOutputPathsParams {
-  /** A list of build targets to get the output paths for. */
-  targets: BuildTargetIdentifier[];
-}
-
-export interface BuildTargetOutputPathsItem {
-  /** The target these output file paths are for. */
-  target: BuildTargetIdentifier;
-
-  /** The output paths for all source files in this target. */
-  outputPaths: string[];
-}
-
-export interface BuildTargetOutputPathsResult {
-  items: BuildTargetOutputPathsItem[];
-}
-```
-
 ## `buildTarget/prepare`
 
 The prepare build target request is sent from the client to the server to prepare the given list of build targets for editor functionality.
@@ -119,6 +88,18 @@ export interface SourceKitSourceItemData {
    * inferring build settings from it. Listing header files in `buildTarget/sources` allows SourceKit-LSP to provide
    * semantic functionality for header files if they haven't been included by any main file. **/
   isHeader?: bool;
+
+  /**
+   * The output path that are is during indexing for this file, ie. the `-index-unit-output-path`, if it is specified
+   * in the compiler arguments or the file that is passed as `-o`, if `-index-unit-output-path` is not specified.
+   *
+   * This allows SourceKit-LSP to remove index entries for source files that are removed from a target but remain
+   * present on disk and to index a file that is part of multiple targets in the context of each target.
+   *
+   * The server communicates during the initialize handshake whether it populates this property by setting
+   * `outputPathsProvider: true` in `SourceKitInitializeBuildResponseData`.
+   */
+  outputPath?: string;
 }
 ```
 

Sources/BuildServerProtocol/CMakeLists.txt

@@ -2,7 +2,6 @@ add_library(BuildServerProtocol STATIC
   Messages.swift
 
   Messages/BuildShutdownRequest.swift
-  Messages/BuildTargetOutputPathsRequest.swift
   Messages/BuildTargetPrepareRequest.swift
   Messages/BuildTargetSourcesRequest.swift
   Messages/InitializeBuildRequest.swift

Sources/BuildServerProtocol/Messages.swift

@@ -14,7 +14,6 @@ public import LanguageServerProtocol
 
 fileprivate let requestTypes: [_RequestType.Type] = [
   BuildShutdownRequest.self,
-  BuildTargetOutputPathsRequest.self,
   BuildTargetPrepareRequest.self,
   BuildTargetSourcesRequest.self,
   CreateWorkDoneProgressRequest.self,

Sources/BuildServerProtocol/Messages/BuildTargetSourcesRequest.swift

@@ -71,6 +71,14 @@ public struct SourceItem: Codable, Hashable, Sendable {
   /// Language-specific metadata about this source item.
   public var data: LSPAny?
 
+  /// If `dataKind` is `sourceKit`, the `data` interpreted as `SourceKitSourceItemData`, otherwise `nil`.
+  public var sourceKitData: SourceKitSourceItemData? {
+    guard dataKind == .sourceKit else {
+      return nil
+    }
+    return SourceKitSourceItemData(fromLSPAny: data)
+  }
+
   public init(
     uri: URI,
     kind: SourceItemKind,
@@ -126,9 +134,20 @@ public struct SourceKitSourceItemData: LSPAnyCodable, Codable {
   /// semantic functionality for header files if they haven't been included by any main file.
   public var isHeader: Bool?
 
-  public init(language: Language? = nil, isHeader: Bool? = nil) {
+  /// The output path that is used during indexing for this file, ie. the `-index-unit-output-path`, if it is specified
+  /// in the compiler arguments or the file that is passed as `-o`, if `-index-unit-output-path` is not specified.
+  ///
+  /// This allows SourceKit-LSP to remove index entries for source files that are removed from a target but remain
+  /// present on disk.
+  ///
+  /// The server communicates during the initialize handshake whether it populates this property by setting
+  /// `outputPathsProvider: true` in `SourceKitInitializeBuildResponseData`.
+  public var outputPath: String?
+
+  public init(language: Language? = nil, isHeader: Bool? = nil, outputPath: String? = nil) {
     self.language = language
     self.isHeader = isHeader
+    self.outputPath = outputPath
   }
 
   public init?(fromLSPDictionary dictionary: [String: LanguageServerProtocol.LSPAny]) {
@@ -138,6 +157,9 @@ public struct SourceKitSourceItemData: LSPAnyCodable, Codable {
     if case .bool(let isHeader) = dictionary[CodingKeys.isHeader.stringValue] {
       self.isHeader = isHeader
     }
+    if case .string(let outputFilePath) = dictionary[CodingKeys.outputPath.stringValue] {
+      self.outputPath = outputFilePath
+    }
   }
 
   public func encodeToLSPAny() -> LanguageServerProtocol.LSPAny {
@@ -148,6 +170,9 @@ public struct SourceKitSourceItemData: LSPAnyCodable, Codable {
     if let isHeader {
       result[CodingKeys.isHeader.stringValue] = .bool(isHeader)
     }
+    if let outputPath {
+      result[CodingKeys.outputPath.stringValue] = .string(outputPath)
+    }
     return .dictionary(result)
   }
 }

Sources/BuildServerProtocol/Messages/InitializeBuildRequest.swift

@@ -282,6 +282,7 @@ public struct SourceKitInitializeBuildResponseData: LSPAnyCodable, Codable, Send
   public var watchers: [FileSystemWatcher]?
 
   @available(*, deprecated, message: "Use initializer with alphabetical order of parameters")
+  @_disfavoredOverload
   public init(
     indexDatabasePath: String? = nil,
     indexStorePath: String? = nil,

Sources/BuildServerProtocol/SupportTypes/BuildTarget.swift

@@ -68,10 +68,10 @@ public struct BuildTarget: Codable, Hashable, Sendable {
 
   public init(
     id: BuildTargetIdentifier,
-    displayName: String?,
-    baseDirectory: URI?,
-    tags: [BuildTargetTag],
-    capabilities: BuildTargetCapabilities,
+    displayName: String? = nil,
+    baseDirectory: URI? = nil,
+    tags: [BuildTargetTag] = [],
+    capabilities: BuildTargetCapabilities = BuildTargetCapabilities(),
     languageIds: [Language],
     dependencies: [BuildTargetIdentifier],
     dataKind: BuildTargetDataKind? = nil,