Add attach launch configuration

Useful for attaching to already running sourcekit-lsp executable.

Author: adam-fowler

.vscode/launch.json

@@ -7,7 +7,8 @@
             "program": "${workspaceFolder:sourcekit-lsp}/.build/debug/sourcekit-lsp",
             "args": [],
             "cwd": "${workspaceFolder:sourcekit-lsp}",
-            "preLaunchTask": "swift: Build Debug sourcekit-lsp"
+            "preLaunchTask": "swift: Build Debug sourcekit-lsp",
+            "sourceLanguages": ["swift"]
         },
         {
             "type": "lldb",
@@ -16,7 +17,16 @@
             "program": "${workspaceFolder:sourcekit-lsp}/.build/release/sourcekit-lsp",
             "args": [],
             "cwd": "${workspaceFolder:sourcekit-lsp}",
-            "preLaunchTask": "swift: Build Release sourcekit-lsp"
+            "preLaunchTask": "swift: Build Release sourcekit-lsp",
+            "sourceLanguages": ["swift"]
+        },
+        {
+            "type": "lldb",
+            "request": "attach",
+            "name": "Attach sourcekit-lsp",
+            "program": "${workspaceFolder:sourcekit-lsp}/.build/debug/sourcekit-lsp",
+            "sourceLanguages": ["swift"],
+            "waitFor": true
         }
     ]
 }