Save lastVersion in global state

src/extension.ts

@@ -12,7 +12,7 @@ import { pickComplex, PickComplexOptions, pickConnection, setAsAbsolutePath } fr
 
 function getVersion(): string | undefined {
   const ext = vscode.extensions.getExtension('Kelvin.vscode-sshfs');
-  return ext && ext.packageJSON && ext.packageJSON.version;
+  return ext?.packageJSON?.version;
 }
 
 interface CommandHandler {
@@ -31,6 +31,17 @@ export function activate(context: vscode.ExtensionContext) {
 
   setDebug(context.extensionMode !== vscode.ExtensionMode.Production);
 
+  // Likely that we'll have a breaking change in the future that requires users to check
+  // their configs, or at least reconfigure already existing workspaces with new URIs.
+  // See https://github.com/SchoofsKelvin/vscode-sshfs/issues/198#issuecomment-785926352
+  const previousVersion = context.globalState.get<string>('lastVersion');
+  context.globalState.update('lastVersion', getVersion());
+  if (!previousVersion) {
+    Logging.info('No previous version detected. Fresh or pre-v1.21.0 installation?');
+  } else if (previousVersion !== getVersion()) {
+    Logging.info(`Previously used version ${previousVersion}, first run after install.`);
+  }
+
   // Really too bad we *need* the ExtensionContext for relative resources
   // I really don't like having to pass context to *everything*, so let's do it this way
   setAsAbsolutePath(context.asAbsolutePath.bind(context));