Add IsUpdateAvailable function to check for newer versions

cmd/update.go

@@ -233,3 +233,22 @@ func atoiOrZero(s string) int {
 	i, _ := strconv.Atoi(s)
 	return i
 }
+
+// IsUpdateAvailable checks if a newer version of the application is available
+// by calling getLatestRelease() to fetch the latest release
+// information from GitHub.
+func IsUpdateAvailable(currentVersion, customVersion string) string {
+	release, err := getLatestRelease(customVersion)
+	if err != nil {
+		return ""
+	}
+
+	latestVersion := release.TagName
+
+	// Compare versions
+	if customVersion == "" && compareVersions(currentVersion, latestVersion) >= 0 {
+		return ""
+	}
+
+	return latestVersion
+}

main.go

@@ -22,6 +22,13 @@ func main() {
 		Copyright: "© JioTV Go by Mohammed Rabil (https://github.com/rabilrbl/jiotv_go)",
 		Compiled:  time.Now(),
 		Suggest:   true,
+		Before: func(c *cli.Context) error {
+			isUpdateAvailableVersion := cmd.IsUpdateAvailable(c.App.Version, "")
+			if isUpdateAvailableVersion != "" {
+				fmt.Printf("Newer version %s available. Run `jiotv_go update` to update.\n", isUpdateAvailableVersion)
+			}
+			return nil
+		},
 		Commands: []*cli.Command{
 			{
 				Name:        "serve",