correct usage of 'iterator' and 'scanner'

Makefile

@@ -59,6 +59,11 @@ proto:
 	# rm -f auto.pb.go
 	autogenpb --proto file.proto --package main
 	# rm -f auto.sort.pb.go auto.newsort.pb.go # auto.marshal.pb.go
+	#
+
+# use the current autogenpb
+proto-local: bak clean
+	./autogenpb.last --proto file.proto --package main
 
 junk:
 	cd example; rm -f go.* *.pb.go

generateSort.go

@@ -44,8 +44,8 @@ func newIter(w io.Writer, msg *MsgName) string {
 	// in this file where it is "new or "New". I changed it to lower case 2025.01.12
 	funcdef := "func new" + APPLE + "Iterator(things []*" + APPLE + ") *" + APPLE + "Iterator"
 
-	fmt.Fprintln(w, "// DEFINE THE", APPLE, "ITERATOR.")
-	fmt.Fprintln(w, "// itializes a new iterator.")
+	fmt.Fprintln(w, "// DEFINE THE", APPLE, "SCANNER.")
+	fmt.Fprintln(w, "// itializes a new scanner.")
 	fmt.Fprintln(w, funcdef, "{")
 	fmt.Fprintln(w, "	return &"+APPLE+"Iterator{things: things}")
 	fmt.Fprintln(w, "}")
@@ -75,7 +75,7 @@ func newIter(w io.Writer, msg *MsgName) string {
 	fmt.Fprintln(w, "	return it.things[it.index-1]")
 	fmt.Fprintln(w, "}")
 	fmt.Fprintln(w, "")
-	fmt.Fprintln(w, "// END DEFINE THE ITERATOR")
+	fmt.Fprintln(w, "// END DEFINE THE SCANNER")
 	fmt.Fprintln(w, "")
 
 	return funcdef
@@ -127,8 +127,8 @@ func (msg *MsgName) addIterAllFunc(w io.Writer, FRUIT, APPLE, APPLES string) str
 	fmt.Fprintln(w, "")
 	// should this be 'new' or 'New' ? Does it matter? I think it's totally internal here. I think there are only 3 places
 	// in this file where it is "new or "New". I changed it to lower case 2025.01.12
-	fmt.Fprintln(w, "	iterator := new"+APPLE+"Iterator("+APPLE+"Pointers)")
-	fmt.Fprintln(w, "	return iterator")
+	fmt.Fprintln(w, "	scanner := new"+APPLE+"Iterator("+APPLE+"Pointers)")
+	fmt.Fprintln(w, "	return scanner")
 	fmt.Fprintln(w, "}")
 	fmt.Fprintln(w, "")
 
@@ -179,8 +179,8 @@ func (msg *MsgName) addAllFunc(w io.Writer, FRUIT, APPLE, APPLES string) string
 	fmt.Fprintln(w, "")
 	// should this be 'new' or 'New' ? Does it matter? I think it's totally internal here. I think there are only 3 places
 	// in this file where it is "new or "New". I changed it to lower case 2025.01.12
-	fmt.Fprintln(w, "	iterator := new"+APPLE+"Iterator("+APPLE+"Pointers)")
-	fmt.Fprintln(w, "	return iterator")
+	fmt.Fprintln(w, "	scanneriterator := new"+APPLE+"Iterator("+APPLE+"Pointers)")
+	fmt.Fprintln(w, "	return scanneriterator")
 	fmt.Fprintln(w, "}")
 	fmt.Fprintln(w, "")
 

protoReformat.go

@@ -8,6 +8,7 @@ import (
 	"iter"
 	"os"
 	"strings"
+	sync "sync"
 
 	"go.wit.com/log"
 )
@@ -16,7 +17,6 @@ import (
 
 // var maxVarname int
 // var maxVartype int
-var linesIter iter.Seq[string]
 
 func protoReformat(filename string) error {
 	// read in the .proto file
@@ -31,13 +31,13 @@ func protoReformat(filename string) error {
 	var fmtmsg *FormatMsg
 	fmtmsg = new(FormatMsg)
 
-	linesIter = makeLineIter(data)
-
 	var bigName int64
 	var bigType int64
 
+	var allLinesIter iter.Seq[string]
+	allLinesIter = makeLineIter(data)
 	// gets the max vartype and varname
-	for line := range linesIter {
+	for line := range allLinesIter {
 		if strings.HasPrefix(line, "message ") {
 			inMessage = true
 			continue
@@ -69,7 +69,9 @@ func protoReformat(filename string) error {
 	fmtmsg.MaxVartype = bigType
 
 	// write out the messages
-	for line := range linesIter {
+	all := newLinesScanner(strings.Split(string(data), "\n"))
+	for all.Scan() {
+		line := all.Next()
 		if strings.HasPrefix(line, "message ") {
 			if inMessage {
 				// message inception. search for the architect. don't forget your totem
@@ -207,7 +209,7 @@ func slicesPop(parts []string) ([]string, string) {
 	return parts[0 : x-1], end
 }
 
-// 'for x := range' syntax using the awesome golang 1.24 'iter'
+// 'for x := range' syntax using the smartly done golang 1.24 'iter'
 func makeLineIter(data []byte) iter.Seq[string] {
 	items := strings.Split(string(data), "\n")
 	// log.Println("Made All() Iter.Seq[] with length", len(items))
@@ -268,3 +270,36 @@ func formatMessage2(curmsg *FormatMsg) []string {
 	}
 	return newmsg
 }
+
+// DEFINE THE Lines ITERATOR.
+// itializes a new iterator.
+func newLinesScanner(things []string) *LinesScanner {
+	return &LinesScanner{things: things}
+}
+
+type LinesScanner struct {
+	sync.Mutex
+
+	things []string
+	index  int
+}
+
+func (it *LinesScanner) Scan() bool {
+	if it.index >= len(it.things) {
+		return false
+	}
+	it.Lock()
+	it.index++
+	it.Unlock()
+	return true
+}
+
+// Next() returns the next thing in the array
+func (it *LinesScanner) Next() string {
+	if it.index-1 == len(it.things) {
+		fmt.Println("Next() error in LinesScanner", it.index)
+	}
+	return it.things[it.index-1]
+}
+
+// END DEFINE THE ITERATOR