feat(commands): check for updates upon commit creation (#13)

src/index.ts

@@ -10,12 +10,14 @@ import {
   select,
   text,
 } from "@clack/prompts";
-import fs, { fdatasync } from "fs";
+import fs from "fs";
 import path from "path";
 import { CommitStack, Config } from "./types";
 import simpleGit from "simple-git";
 import { Command } from "commander";
 import semver from "semver";
+import { execSync } from "child_process";
+import { tmpdir } from "os";
 
 const GetConfig = async () => {
   if (fs.existsSync(path.join(process.cwd(), ".rczrc"))) {
@@ -40,6 +42,38 @@ const GetConfig = async () => {
     return null;
   }
 };
+
+const CheckForUpdates = async () => {
+  const updateText =
+    "You are running on an outdated version of Resultium Commitizen, in order to update run\n\nnpm install -g @resultium/rcz@latest";
+
+  const cachedVersion = fs.existsSync(path.join(tmpdir(), "rcz-server-version"))
+    ? (await fs.promises.readFile(path.join(tmpdir(), "rcz-server-version")))
+        .toString()
+        .trim()
+    : null;
+  const localVersion = execSync("rcz --version").toString().trim();
+
+  // even if cached once in a while it should get newest data
+  if ((cachedVersion && Math.random() < 0.1) || cachedVersion === null) {
+    const isOnline = (await fetch("https://icanhazip.com")).status === 200;
+    if (!isOnline) return;
+
+    const serverVersion = execSync("npm show @resultium/rcz version")
+      .toString()
+      .trim();
+
+    fs.promises.writeFile(
+      path.join(tmpdir(), "rcz-server-version"),
+      serverVersion
+    );
+
+    if (semver.gt(serverVersion, localVersion)) note(updateText);
+  } else if (cachedVersion) {
+    if (semver.gt(cachedVersion, localVersion)) note(updateText);
+  }
+};
+
 const program = new Command();
 
 program
@@ -54,6 +88,8 @@ program
   .option("-S, --sign", "sign the commit")
   .option("--amend", "amend commit message to the last commit")
   .action(async (options) => {
+    await CheckForUpdates();
+
     const config = await GetConfig();
 
     const sign = config?.autoSignCommits || options.sign ? true : false;