renamed presence to set marker

differ_test.go

@@ -245,7 +245,7 @@ func TestNewDiffer(t *testing.T) {
 				{Type: "update", Path: &Path{Kind: 1, Path: &Path{}, Name: "ID"}, From: 1, To: 2},
 			}},
 		},
-		{description: "diff with field presence check",
+		{description: "diff with field setMarker check",
 			from: &PresRecord{ID: 20, Name: "abc", Bar: 23,
 				Has: &PresRecordHas{
 					Name: true,
@@ -258,7 +258,7 @@ func TestNewDiffer(t *testing.T) {
 				},
 			},
 
-			options: []Option{WithPresence(true)},
+			options: []Option{WithSetMarker(true)},
 			expect: &ChangeLog{Changes: []*Change{
 				{Type: "update", Path: &Path{Kind: PathKinField, Path: &Path{}, Name: "ID"}, From: 20, To: 21},
 				{Type: "update", Path: &Path{Kind: PathKinField, Path: &Path{}, Name: "Name"}, From: "abc", To: "xyz"},

option.go

@@ -4,7 +4,7 @@ package godiff
 type ConfigOption func(config *Config)
 
 type Options struct {
-	presence     bool
+	setMarker    bool
 	shallow      bool
 	nullifyEmpty *bool
 	depth        int
@@ -35,9 +35,9 @@ func WithTag(tag *Tag) ConfigOption {
 	}
 }
 
-func WithPresence(f bool) Option {
+func WithSetMarker(f bool) Option {
 	return func(options *Options) {
-		options.presence = f
+		options.setMarker = f
 	}
 }
 

struct.go

@@ -34,7 +34,7 @@ func (s *structDiffer) diff(changeLog *ChangeLog, path *Path, from, to interface
 			changeLog.AddError(path.Field(field.name), err)
 			continue
 		}
-		if options.presence {
+		if options.setMarker {
 			hasPtr := toPtr
 			if s.marker.CanUseHolder(toPtr) {
 				hasPtr = fromPtr
@@ -43,7 +43,7 @@ func (s *structDiffer) diff(changeLog *ChangeLog, path *Path, from, to interface
 				continue //skip diff, to/dest is not set
 			}
 			if field.tag != nil && field.tag.PresenceMarker {
-				continue //do not compare presence tag
+				continue //do not compare setMarker tag
 			}
 		}