tagcmp.go

@@ -14,8 +14,9 @@ type Tag struct {
 	MissingMinor bool   // whether or not the minor semver part was left out
 	Patch        string `json:",omitempty"` // patch semver part
 	MissingPatch bool   // whether or not he patch semver part was left out
-	Suffix       string // tag suffix (e.g. "-alpine")
+	Suffix       string // tag suffix (e.g. "-alpine") [would be release candidate in semver]
 	UsesV        bool   // whether or not the tag uses the "v" prefix
+	Metadata     string // metadata: what's after + and after the first "-"
 }
 
 // ByTagAsc sorts tags in ascending order where the last element is the latest tag.
@@ -96,6 +97,10 @@ func (t Tag) Equals(tag Tag) bool {
 		return false
 	}
 
+	if t.Metadata != tag.Metadata {
+		return false
+	}
+
 	// ignore errors since Parse already handled
 	mj1, _ := strconv.Atoi(t.Major)
 	mj2, _ := strconv.Atoi(tag.Major)
@@ -136,6 +141,10 @@ func (t Tag) String() string {
 		repr += fmt.Sprintf("-%s", t.Suffix)
 	}
 
+	if t.Metadata != "" {
+		repr += fmt.Sprintf("+%s", t.Metadata)
+	}
+
 	return repr
 }
 
@@ -280,6 +289,7 @@ func patternMatches(tag string) error {
 // patternCounts determines if tags match unsupported patterns by counting occurences of matches
 func patternCounts(tag string) error {
 	v := regexp.MustCompile(DotPattern)
+	tag = strings.Split(tag, "+")[0]
 	if m := v.FindAllStringIndex(tag, -1); len(m) > 1 {
 		return fmt.Errorf("'%s' is not supported (%s)", tag, DotPattern)
 	}
@@ -317,8 +327,15 @@ func Parse(tag string) (Tag, error) {
 		usesV = true
 	}
 
+	var metadata string
+	splits := strings.Split(tag, "+")
+	if len(splits) > 1 {
+		tag = splits[0]
+		metadata = splits[1]
+	}
+
 	var suffix string
-	splits := strings.SplitN(tag, "-", 2)
+	splits = strings.SplitN(tag, "-", 2)
 	if len(splits) > 1 {
 		tag = splits[0]
 		suffix = splits[1]
@@ -373,6 +390,7 @@ func Parse(tag string) (Tag, error) {
 		MissingPatch: missingPatch,
 		UsesV:        usesV,
 		Suffix:       suffix,
+		Metadata:     metadata,
 	}
 
 	return parsedTag, nil