Fix printing multiple files at once

main.go

@@ -50,6 +50,10 @@ func main() {
 	}
 
 	must("Enable Bluetooth stack", adapter.Enable())
+	pyfilterloc := dumpFilter(*dir)
+	defer func() {
+		os.RemoveAll(pyfilterloc)
+	}()
 
 	log.Println("Scanning for Bluetooth devices...")
 	ch := make(chan bluetooth.ScanResult, 1)
@@ -67,7 +71,13 @@ func main() {
 	select {
 	case device := <-ch:
 		log.Println("Found device: ", device.Address.String(), device.RSSI, device.LocalName())
-		tryToPrint(device, *dir, files)
+		for _, file := range files {
+			filePath := filepath.Join(*dir, file.Name())
+			if isPossibleToPrint(filePath) {
+				log.Printf("Trying to print %s\n", filePath)
+				tryToPrint(device, pyfilterloc, filePath)
+			}
+		}
 	case <-time.After(10 * time.Second):
 		log.Fatal("Timeout trying to locate Phomemo M02, is it on? Quitting.")
 		os.Exit(1)
@@ -88,14 +98,14 @@ func copyFileToFolder(file string, folder string) error {
 	return nil
 }
 
-func tryToPrint(phomemoAddress bluetooth.ScanResult, dir string, files []os.DirEntry) {
+func tryToPrint(phomemoAddress bluetooth.ScanResult, pyfilterloc string, filePath string) {
 	var phomemo *bluetooth.Device
 	phomemo, err := adapter.Connect(phomemoAddress.Address, bluetooth.ConnectionParams{})
-	must("failed to connect to adapter", err)
-	log.Println("connected to ", phomemoAddress.Address.String())
+	must("Failed to connect to adapter", err)
+	log.Println("Connected to ", phomemoAddress.Address.String())
 	defer func() {
 		if err := phomemo.Disconnect(); err != nil {
-			log.Println(err)
+			log.Fatalf("Cannot disconnect: %w\n", err)
 		} else {
 			log.Println("disconnected")
 		}
@@ -109,25 +119,11 @@ func tryToPrint(phomemoAddress bluetooth.ScanResult, dir string, files []os.DirE
 	log.Println("- service", srvc.UUID().String())
 
 	chars, err := srvc.DiscoverCharacteristics(nil)
-	must("failed to discover characteristics of service", err)
-
-	pyfilterloc := filepath.Join(dir, "phomemo-filter.py")
-	dumpFilter(pyfilterloc)
-	defer func() {
-		os.RemoveAll(pyfilterloc)
-	}()
+	must("Failed to discover characteristics of service", err)
 
 	// 3 characteristics to discover 0000ff01, 0000ff02, and 0000ff03
-	for _, file := range files {
-		filePath := dir + "/" + file.Name()
-		if isPossibleToPrint(filePath) {
-			writeData(pyfilterloc, filePath, chars[1]) // 0000ff02-...
-			readResult(chars[0])                       // 0000ff01-...
-			os.RemoveAll(filePath)
-		}
-	}
-
-	log.Println("-- DONE")
+	writeData(pyfilterloc, filePath, chars[1]) // 0000ff02-...
+	readResult(chars[0])                       // 0000ff01-...
 }
 
 func isPossibleToPrint(filename string) bool {
@@ -137,9 +133,11 @@ func isPossibleToPrint(filename string) bool {
 		strings.HasSuffix(filename, ".PNG")
 }
 
-func dumpFilter(filename string) {
+func dumpFilter(dir string) string {
+	filename := filepath.Join(dir, "phomemo-filter.py")
 	err := os.WriteFile(filename, phomemofilter.Pyfilter, 0666)
 	must("unable to dump python filter for use", err)
+	return filename
 }
 
 func writeData(pyfilterloc string, path string, char bluetooth.DeviceCharacteristic) {