chore: add new interactive release package (#22624)

scripts/releaser/version.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// version holds a parsed semver version.
+type version struct {
+	Major int
+	Minor int
+	Patch int
+}
+
+var semverRe = regexp.MustCompile(`^v(\d+)\.(\d+)\.(\d+)$`)
+
+func parseVersion(s string) (version, bool) {
+	m := semverRe.FindStringSubmatch(s)
+	if m == nil {
+		return version{}, false
+	}
+	maj, _ := strconv.Atoi(m[1])
+	mnr, _ := strconv.Atoi(m[2])
+	pat, _ := strconv.Atoi(m[3])
+	return version{Major: maj, Minor: mnr, Patch: pat}, true
+}
+
+func (v version) String() string {
+	return fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
+}
+
+func (v version) GreaterThan(b version) bool {
+	if v.Major != b.Major {
+		return v.Major > b.Major
+	}
+	if v.Minor != b.Minor {
+		return v.Minor > b.Minor
+	}
+	return v.Patch > b.Patch
+}
+
+func (v version) Equal(b version) bool {
+	return v.Major == b.Major && v.Minor == b.Minor && v.Patch == b.Patch
+}
+
+// allSemverTags returns all semver tags sorted descending.
+func allSemverTags() ([]version, error) {
+	out, err := gitOutput("tag", "--sort=-v:refname")
+	if err != nil {
+		return nil, err
+	}
+	if out == "" {
+		return nil, nil
+	}
+	var tags []version
+	for _, line := range strings.Split(out, "\n") {
+		if v, ok := parseVersion(strings.TrimSpace(line)); ok {
+			tags = append(tags, v)
+		}
+	}
+	return tags, nil
+}
+
+// mergedSemverTags returns semver tags reachable from HEAD, sorted
+// descending.
+func mergedSemverTags() ([]version, error) {
+	out, err := gitOutput("tag", "--merged", "HEAD", "--sort=-v:refname")
+	if err != nil {
+		return nil, err
+	}
+	if out == "" {
+		return nil, nil
+	}
+	var tags []version
+	for _, line := range strings.Split(out, "\n") {
+		if v, ok := parseVersion(strings.TrimSpace(line)); ok {
+			tags = append(tags, v)
+		}
+	}
+	return tags, nil
+}