Setnewstates as method, sort, check and set to skip noop

main.go

@@ -11,6 +11,7 @@ import (
 	"local/truckstop/message"
 	"log"
 	"regexp"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -66,19 +67,30 @@ func matrixrecv() error {
 			states[state] = struct{}{}
 		}
 	}
-	if len(states) == 0 {
-		return nil
-	}
-	conf := *config.Get()
-	conf.States = []config.State{}
-	for k := range states {
-		conf.States = append(conf.States, k)
-	}
-	log.Printf("%+v, %+v", states, conf)
-	config.Set(conf)
+	setNewStates(states)
 	return nil
 }
 
+func setNewStates(states map[config.State]struct{}) {
+	if len(states) == 0 {
+		return
+	}
+	newstates := []config.State{}
+	for k := range states {
+		newstates = append(newstates, k)
+	}
+	sort.Slice(newstates, func(i, j int) bool {
+		return newstates[i] < newstates[j]
+	})
+	conf := *config.Get()
+	if fmt.Sprint(newstates) == fmt.Sprint(conf.States) {
+		return
+	}
+	conf.States = newstates
+	log.Printf("updating config new states: %+v", conf)
+	config.Set(conf)
+}
+
 func email() error {
 	log.Printf("checking email...")
 	ch, err := config.Get().Emailer.ReadIMAP()
@@ -101,16 +113,7 @@ func email() error {
 			states[state] = struct{}{}
 		}
 	}
-	if len(states) == 0 {
-		return nil
-	}
-	conf := *config.Get()
-	conf.States = []config.State{}
-	for k := range states {
-		conf.States = append(conf.States, k)
-	}
-	log.Printf("%+v, %+v", states, conf)
-	config.Set(conf)
+	setNewStates(states)
 	return nil
 }