Resolves #203 - Log notice on version change

cmd/root.go

@@ -117,6 +117,8 @@ Environment Variables
 			}
 		}
 
+		version.CheckVersionChangeAndLogWarning()
+
 		return nil
 	},
 

external/version/versionchangenotifier.go

@@ -0,0 +1,41 @@
+package version
+
+import (
+	"fmt"
+	"github.com/elasticpath/epcc-cli/external/profiles"
+	log "github.com/sirupsen/logrus"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func CheckVersionChangeAndLogWarning() {
+	lastVersionFilename := filepath.Clean(profiles.GetProfileDataDirectory() + "/last_version.txt")
+
+	lastVersionBytes, err := os.ReadFile(lastVersionFilename)
+	if err != nil && !os.IsNotExist(err) {
+		log.Warnf("Couldn't read file: %s: %v", lastVersionFilename, err)
+
+		return
+	}
+
+	lastVersion := strings.Trim(string(lastVersionBytes), "\r\n ")
+
+	currentVersion := strings.Trim(fmt.Sprintf("%s (Commit %s)", Version, Commit), "\r\n ")
+
+	if lastVersion == currentVersion {
+		return
+	}
+
+	err = os.WriteFile(lastVersionFilename, []byte(currentVersion), 0600)
+
+	if err != nil {
+		log.Warnf("Couldn't write file: %s: %v", lastVersionFilename, err)
+	}
+
+	if lastVersion == "" {
+		return
+	}
+
+	log.Infof("Version of epcc has changed %s => %s", lastVersion, currentVersion)
+}