chore(demo): passing demo number as argument will run that demo

Author: Alexnortung

demo/index.ts

@@ -22,31 +22,38 @@ const getFileNumber = (file: string): number => {
 
 const demoFiles = keys.filter((file) => !isNaN(getFileNumber(file))).sort((a, b) => getFileNumber(a) - getFileNumber(b));
 
-const answers = await inquirer.prompt<Answers>([
-    {
-        type: "list",
-        name: "type",
-        message: "Select demo from a list or via number",
-        choices: ["list", "number"],
-    },
-    {
-        type: "list",
-        name: "demoFile",
-        message: "What demo do you wish to run?",
-        choices: demoFiles,
-        filter: (input) => parseInt(input.split("-")[0], 10),
-        when: (a) => a.type === "list",
-    },
-    {
-        type: "number",
-        name: "demoNumber",
-        message: "What demo do you wish to run? (Enter a number)",
-        default: 1,
-        when: (a) => a.type === "number",
-    },
-]);
-
-const demoNumber = answers.demoNumber ?? answers.demoFile ?? 1;
+const firstArg = process.argv[2];
+const firstArgNumber = Number.parseInt(firstArg, 10);
+let demoNumber: number;
+if (firstArg && !isNaN(firstArgNumber)) {
+    demoNumber = firstArgNumber;
+} else {
+    const answers = await inquirer.prompt<Answers>([
+        {
+            type: "list",
+            name: "type",
+            message: "Select demo from a list or via number",
+            choices: ["list", "number"],
+        },
+        {
+            type: "list",
+            name: "demoFile",
+            message: "What demo do you wish to run?",
+            choices: demoFiles,
+            filter: (input) => parseInt(input.split("-")[0], 10),
+            when: (a) => a.type === "list",
+        },
+        {
+            type: "number",
+            name: "demoNumber",
+            message: "What demo do you wish to run? (Enter a number)",
+            default: 1,
+            when: (a) => a.type === "number",
+        },
+    ]);
+    demoNumber = answers.demoNumber ?? answers.demoFile ?? 1;
+}
+
 const files = fs.readdirSync(dir).filter((fn) => fn.startsWith(demoNumber.toString()));
 
 if (files.length === 0) {