SourceKit-LSP is an implementation of the Language Server Protocol (LSP) for Swift and C-based languages. It provides intelligent editor functionality like code-completion and jump-to-definition to editors that support LSP. SourceKit-LSP is built on top of sourcekitd and clangd for high-fidelity language support, and provides a powerful source code index as well as cross-language support. SourceKit-LSP supports projects that use the Swift Package Manager and projects that generate a compile_commands.json file, such as CMake.
SourceKit-LSP is included in the Swift toolchains available on swift.org and is bundled with Xcode.
swift.org/tools has a list of popular editors that support LSP and can thus be hooked up to SourceKit-LSP to provide intelligent editor functionality as well as set-up guides.
Important
SourceKit-LSP does not update its global index in the background or build Swift modules in the background. Thus, a lot of cross-module or global functionality is limited if the project hasn't been built recently. To update the index or rebuild the Swift modules, build your project or enable the experimental background indexing as described in Enable Experimental Background Indexing.
To learn more about SourceKit-LSP, refer to the Documentation.
Note
If you are using SourceKit-LSP with a SwiftPM project in which you need to pass additional arguments to the swift build invocation, as is commonly the case for embedded projects, you need to teach SourceKit-LSP about those arguments as described in Using SourceKit-LSP with Embedded Projects.
If you should hit any issues while using SourceKit-LSP, we appreciate bug reports on GitHub Issue.
If you want to contribute code to SourceKit-LSP, see CONTRIBUTING.md for more information.