check wether file is already opened before opening it

Author: MarcoWang3

aws-toolkit-vscode.code-workspace

@@ -12,6 +12,12 @@
         {
             "path": "packages/amazonq",
         },
+        {
+            "path": "../language-server-runtimes",
+        },
+        {
+            "path": "../language-servers",
+        },
     ],
     "settings": {
         "typescript.tsdk": "node_modules/typescript/lib",

packages/amazonq/.vscode/launch.json

@@ -13,10 +13,10 @@
             "args": ["--extensionDevelopmentPath=${workspaceFolder}"],
             "env": {
                 "SSMDOCUMENT_LANGUAGESERVER_PORT": "6010",
-                "WEBPACK_DEVELOPER_SERVER": "http://localhost:8080"
+                "WEBPACK_DEVELOPER_SERVER": "http://localhost:8080",
                 // Below allows for overrides used during development
-                // "__AMAZONQLSP_PATH": "${workspaceFolder}/../../../language-servers/app/aws-lsp-codewhisperer-runtimes/out/agent-standalone.js",
-                // "__AMAZONQLSP_UI": "${workspaceFolder}/../../../language-servers/chat-client/build/amazonq-ui.js"
+                "__AMAZONQLSP_PATH": "${workspaceFolder}/../../../language-servers/app/aws-lsp-codewhisperer-runtimes/out/agent-standalone.js",
+                "__AMAZONQLSP_UI": "${workspaceFolder}/../../../language-servers/chat-client/build/amazonq-ui.js"
             },
             "envFile": "${workspaceFolder}/.local.env",
             "outFiles": ["${workspaceFolder}/dist/**/*.js", "${workspaceFolder}/../core/dist/**/*.js"],

packages/amazonq/src/lsp/chat/messages.ts

@@ -604,8 +604,20 @@ export function registerMessageListeners(
     languageClient.onRequest(openWorkspaceFileRequestType.method, async (params: OpenWorkspaceFileParams) => {
         try {
             const uri = vscode.Uri.file(params.filePath)
-            const doc = await vscode.workspace.openTextDocument(uri)
-            await vscode.window.showTextDocument(doc, { preview: false })
+
+            // Check if the file is already opened in any visible text editor
+            const existingEditor = vscode.window.visibleTextEditors.find(
+                (editor) => editor.document.uri.toString() === uri.toString()
+            )
+
+            let doc: vscode.TextDocument
+            if (existingEditor) {
+                // File is already open, use the existing document
+                doc = existingEditor.document
+            } else {
+                // File is not open, open it
+                doc = await vscode.workspace.openTextDocument(uri)
+            }
             if (params.makeActive) {
                 await vscode.window.showTextDocument(doc, { preview: false, preserveFocus: false })
             }