check for file:/// or https:// data file url in Open Data File prompt (#99)

prior to executing view table command for the given data file url

Author: RandomFractals

data/usa-airports.tsv.schema.json

@@ -0,0 +1,42 @@
+{
+  "fields": [
+    {
+      "name": "iata",
+      "type": "string",
+      "format": "default"
+    },
+    {
+      "name": "name",
+      "type": "string",
+      "format": "default"
+    },
+    {
+      "name": "city",
+      "type": "string",
+      "format": "default"
+    },
+    {
+      "name": "state",
+      "type": "string",
+      "format": "default"
+    },
+    {
+      "name": "country",
+      "type": "string",
+      "format": "default"
+    },
+    {
+      "name": "latitude",
+      "type": "number",
+      "format": "default"
+    },
+    {
+      "name": "longitude",
+      "type": "number",
+      "format": "default"
+    }
+  ],
+  "missingValues": [
+    ""
+  ]
+}

data/usa-airports.tsv.table.json

@@ -0,0 +1,76 @@
+{
+  "columns": [
+    {
+      "width": 52,
+      "minWidth": 40,
+      "download": false,
+      "formatter": "rowSelection",
+      "titleFormatter": "rowSelection",
+      "resizable": true,
+      "headerSort": false
+    },
+    {
+      "field": "iata",
+      "title": "iata",
+      "width": 79,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "string",
+      "headerSort": true
+    },
+    {
+      "field": "name",
+      "title": "name",
+      "width": 155,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "string",
+      "headerSort": true
+    },
+    {
+      "field": "city",
+      "title": "city",
+      "width": 143,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "string",
+      "headerSort": true
+    },
+    {
+      "field": "state",
+      "title": "state",
+      "width": 87,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "string",
+      "headerSort": true
+    },
+    {
+      "field": "country",
+      "title": "country",
+      "width": 104,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "string",
+      "headerSort": true
+    },
+    {
+      "field": "latitude",
+      "title": "latitude",
+      "width": 104,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "number",
+      "headerSort": true
+    },
+    {
+      "field": "longitude",
+      "title": "longitude",
+      "width": 177,
+      "minWidth": 40,
+      "resizable": true,
+      "sorter": "number",
+      "headerSort": true
+    }
+  ]
+}

src/commands/openDataFile.ts

@@ -18,15 +18,20 @@ export async function registerOpenDataFileCommand(context: ExtensionContext) {
 			window.showInputBox({
 				ignoreFocusOut: true,
 				placeHolder: 'file:/// or https://',
-				prompt: 'Enter Data File Url'
-			}).then((dataFileUrl: string | undefined) => {
+				prompt: 'Enter Data File Url for Table View'
+			}).then((dataFileUrl: string | undefined) => {				
 				if (dataFileUrl && dataFileUrl !== undefined && dataFileUrl.length > 0) {
 					// create data file Uri
 					const dataFileUri: Uri = Uri.parse(dataFileUrl);
 
 					// check supported data files
 					const fileExtension: string = path.extname(dataFileUrl);
-					if ((<any>Object).values(FileTypes).includes(fileExtension)) {
+					if (!dataFileUrl?.startsWith('file:///') && !dataFileUrl?.startsWith('https://')) {
+						window.showErrorMessage(
+							`Tabular Data Viewer requires a valid \`file:///\` or \`https://\` data file Url \
+							to display Table View. Invalid data document Url: \`${dataFileUrl}\`.`);
+					}
+					else if ((<any>Object).values(FileTypes).includes(fileExtension)) {
 						// open table view for the data file
 						commands.executeCommand(ViewCommands.viewTable, dataFileUri);
 					}