Move software version handling to a new package

version/version.go

@@ -0,0 +1,29 @@
+package version
+
+import (
+	"fmt"
+	"log"
+
+	"golang.org/x/mod/semver"
+)
+
+const CurrentVersion string = "v0.11.0"
+
+func NewVersionAvailable(v string) bool {
+	if !semver.IsValid(CurrentVersion) {
+		panic(fmt.Sprintf("my current version '%s' is not valid", CurrentVersion))
+	}
+	if !semver.IsValid(v) {
+		// maybe this should just be a warning
+		log.Printf("passed in version '%s' is not valid - assuming no new version", v)
+		return false
+	}
+	comp := semver.Compare(v, CurrentVersion)
+	if comp == 0 {
+		return false
+	}
+	if comp == -1 {
+		return true
+	}
+	return false // they are using a newer one than exists?
+}

version/version_test.go

@@ -0,0 +1,11 @@
+package version
+
+import (
+	"testing"
+)
+
+func TestVersioning(t *testing.T) {
+	if !NewVersionAvailable("v0.1.0") {
+		t.Error("should be a version newer than v0.1.0")
+	}
+}