feat: add experimental support for Ty language server (#5575)

packages/opencode/src/lsp/server.ts

@@ -361,6 +361,62 @@ export namespace LSPServer {
     },
   }
 
+  export const Ty: Info = {
+    id: "ty",
+    extensions: [".py", ".pyi"],
+    root: NearestRoot(["pyproject.toml", "ty.toml", "setup.py", "setup.cfg", "requirements.txt", "Pipfile", "pyrightconfig.json"]),
+    async spawn(root) {
+      if(!Flag.OPENCODE_EXPERIMENTAL_LSP_TY) {
+        return undefined
+      }
+
+      let binary = Bun.which("ty")
+
+      const initialization: Record<string, string> = {}
+
+      const potentialVenvPaths = [process.env["VIRTUAL_ENV"], path.join(root, ".venv"), path.join(root, "venv")].filter(
+        (p): p is string => p !== undefined,
+      )
+      for (const venvPath of potentialVenvPaths) {
+        const isWindows = process.platform === "win32"
+        const potentialPythonPath = isWindows
+          ? path.join(venvPath, "Scripts", "python.exe")
+          : path.join(venvPath, "bin", "python")
+        if (await Bun.file(potentialPythonPath).exists()) {
+          initialization["pythonPath"] = potentialPythonPath
+          break
+        }
+      }
+
+      if(!binary) {
+        for (const venvPath of potentialVenvPaths) {
+          const isWindows = process.platform === "win32"
+          const potentialTyPath = isWindows
+            ? path.join(venvPath, "Scripts", "ty.exe")
+            : path.join(venvPath, "bin", "ty")
+          if (await Bun.file(potentialTyPath).exists()) {
+            binary = potentialTyPath
+            break
+          }
+        }
+      }
+
+      if(!binary) {
+        log.error("ty not found, please install ty first")
+        return
+      }
+
+      const proc = spawn(binary, ["server"], {
+        cwd: root,
+      })
+      
+      return {
+        process: proc,
+        initialization,
+      }
+    },
+  }
+
   export const Pyright: Info = {
     id: "pyright",
     extensions: [".py", ".pyi"],