feat: add SourceKit LSP support (#1545)

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/opencode/src/lsp/server.ts

@@ -547,6 +547,40 @@ export namespace LSPServer {
     },
   }
 
+  export const SourceKit: Info = {
+    id: "sourcekit-lsp",
+    extensions: [".swift", ".objc", "objcpp"],
+    root: NearestRoot(["Package.swift", "*.xcodeproj", "*.xcworkspace"]),
+    async spawn(root) {
+      // Check if sourcekit-lsp is available in the PATH
+      // This is installed with the Swift toolchain
+      const sourcekit = Bun.which("sourcekit-lsp")
+      if (sourcekit) {
+        return {
+          process: spawn(sourcekit, {
+            cwd: root,
+          }),
+        }
+      }
+
+      // If sourcekit-lsp not found, check if xcrun is available
+      // This is specific to macOS where sourcekit-lsp is typically installed with Xcode
+      if (!Bun.which("xcrun")) return
+
+      const lspLoc = await $`xcrun --find sourcekit-lsp`.quiet().nothrow()
+
+      if (lspLoc.exitCode !== 0) return
+
+      const bin = lspLoc.text().trim()
+
+      return {
+        process: spawn(bin, {
+          cwd: root,
+        }),
+      }
+    },
+  }
+
   export const RustAnalyzer: Info = {
     id: "rust",
     root: async (root) => {

packages/web/src/content/docs/lsp.mdx

@@ -12,7 +12,7 @@ OpenCode integrates with your Language Server Protocol (LSP) to help the LLM int
 OpenCode comes with several built-in LSP servers for popular languages:
 
 | LSP Server    | Extensions                                           | Requirements                                                 |
-| ---------- | ---------------------------------------------------- | ------------------------------------------------------------ |
+| ------------- | ---------------------------------------------------- | ------------------------------------------------------------ |
 | typescript    | .ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts         | `typescript` dependency in project                           |
 | deno          | .ts, .tsx, .js, .jsx, .mjs                           | `deno` command available (auto-detects deno.json/deno.jsonc) |
 | eslint        | .ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts, .vue   | `eslint` dependency in project                               |
@@ -29,6 +29,7 @@ OpenCode comes with several built-in LSP servers for popular languages:
 | astro         | .astro                                               | Auto-installs for Astro projects                             |
 | jdtls         | .java                                                | `Java SDK (version 21+)` installed                           |
 | lua-ls        | .lua                                                 | Auto-installs for Lua projects                               |
+| sourcekit-lsp | .swift, .objc, .objcpp                               | `swift` installed (`xcode` on macOS)                         |
 
 LSP servers are automatically enabled when one of the above file extensions are detected and the requirements are met.