unique tag setting for Append()

Signed-off-by: Jeff Carr <jcarr@wit.com>

argv.go

@@ -12,6 +12,7 @@ type args struct {
 	LoBase    string   `arg:"--lobase"                  help:"lowercase basename"`
 	UpBase    string   `arg:"--upbase"                  help:"uppercase basename"`
 	Proto     string   `arg:"--proto"                   help:"the .proto filename"`
+	Append    string   `arg:"--append"                  help:"will keep this key unique on append"`
 	Sort      []string `arg:"--sort"                    help:"how and what to sort on"`
 	Marshal   []string `arg:"--marshal"                 help:"what to marshal on"`
 	NoMarshal bool     `arg:"--no-marshal"              help:"do not make a marshal.pb.go file"`

main.go

@@ -64,6 +64,9 @@ func main() {
 	sortmap["sortBy"] = sortparts[0]
 	sortmap["sortKey"] = sortparts[1]
 
+	// will keep this key unique if defined
+	sortmap["append"] = argv.Append
+
 	if argv.DryRun {
 		for k, v := range sortmap {
 			log.Info(k, "=", v)
@@ -214,17 +217,23 @@ func iterEnd(w io.Writer, names map[string]string) {
 }
 
 func iterAppend(w io.Writer, names map[string]string) {
-	fmt.Fprintln(w, "// enforces no duplicate Refname names")
+	if names["append"] != "" {
+		fmt.Fprintln(w, "// enforces "+names["append"]+" is unique")
+	} else {
+		fmt.Fprintln(w, "// does not enforce any unique fields")
+	}
 	fmt.Fprintln(w, "func (all *"+names["Bases"]+") Append(newP *"+names["Base"]+") bool {")
 	fmt.Fprintln(w, "	"+names["lock"]+".Lock()")
 	fmt.Fprintln(w, "	defer "+names["lock"]+".Unlock()")
 	fmt.Fprintln(w, "")
+	if names["append"] != "" {
 		fmt.Fprintln(w, "	for _, p := range all."+names["Bases"]+" {")
-	fmt.Fprintln(w, "		if p.Refname == newP.Refname {")
+		fmt.Fprintln(w, "		if p."+names["append"]+" == newP."+names["append"]+" {")
 		fmt.Fprintln(w, "			return false")
 		fmt.Fprintln(w, "		}")
 		fmt.Fprintln(w, "	}")
 		fmt.Fprintln(w, "")
+	}
 	fmt.Fprintln(w, "	all."+names["Bases"]+" = append(all."+names["Bases"]+", newP)")
 	fmt.Fprintln(w, "	return true")
 	fmt.Fprintln(w, "}")

testautogen/Makefile

@@ -6,7 +6,7 @@ test: vet
 all: clean test.pb.go run vet
 
 run:
-	../autogenpb --proto test.proto --lobase gitTag --upbase GitTag --sort "ByPath,Refname" --marshal GitTags
+	../autogenpb --proto test.proto --lobase gitTag --upbase GitTag --sort "ByPath,Refname" --marshal GitTags --append Refname
 
 vet:
 	@GO111MODULE=off go vet