Improve the error message on code snippet and user defined template (#83)

Author: eriolchan

package-lock.json

@@ -2,9 +2,8 @@
   "name": "vscode-dtdl",
   "displayName": "DTDL",
   "description": "This extension provides syntax highlighting to read and edit JSON documents using the Digital Twins Definition Language",
-  "version": "0.2.0",
+  "version": "1.0.0-rc3",
   "publisher": "vsciot-vscode",
-  "preview": true,
   "aiKey": "[AIKEY PLACEHOLDER]",
   "icon": "logo.png",
   "license": "SEE LICENSE IN LICENSE.txt",
@@ -95,7 +94,7 @@
     "copy-webpack-plugin": "^6.0.1"
   },
   "dependencies": {
-    "dtdl-language-server": "^0.4.2",
+    "dtdl-language-server": "^0.4.3",
     "fs-extra": "^7.0.1",
     "vscode-extension-telemetry": "^0.1.6",
     "vscode-languageclient": "^6.1.3"

package.json

@@ -16,7 +16,7 @@
   "Add DTDL Command" : {
     "prefix": "dtc",
     "body" : [
-      "{\n\t\"@type\": \"Command\",\n\t\"name\": \"$1\",\n\t\"schema\": $2\n}"
+      "{\n\t\"@type\": \"Command\",\n\t\"name\": \"$1\"\n}"
     ],
     "description": "Adds a DTDL Command"
   }

snippets/snippets.json

@@ -85,6 +85,10 @@ export class UI {
    */
   public static async selectTemplateFile(label: string, folder: string): Promise<string> {
     const files: string[] = Utility.listFile(folder, Constants.TEMPLATE_FILE_GLOB);
+    if (!files.length) {
+      const message = `${UIConstants.TEMPLATES_NOT_FOUND_MSG} ${folder}`;
+      throw new Error(message);
+    }
     if (files.length === 1) {
       return files[0];
     }

src/view/ui.ts

@@ -9,4 +9,5 @@ export class UIConstants {
   public static readonly SELECT_TEMPLATE_FILE_LABEL = "Select template file";
   public static readonly INPUT_MODEL_NAME_LABEL = "Input device model name";
   public static readonly BROWSE_LABEL = "Browse...";
+  public static readonly TEMPLATES_NOT_FOUND_MSG = "No template is found in folder";
 }