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Copy pathversion.go
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137 lines (125 loc) · 3.31 KB
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package main
import (
"fmt"
"regexp"
"sort"
"strconv"
"strings"
)
// version holds a parsed semver version with optional prerelease
// suffix (e.g. "rc.0").
type version struct {
Major int
Minor int
Patch int
Pre string // e.g. "rc.0", "" for stable releases.
}
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, Pre: m[5]}, true
}
func (v version) String() string {
if v.Pre != "" {
return fmt.Sprintf("v%d.%d.%d-%s", v.Major, v.Minor, v.Patch, v.Pre)
}
return fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
}
// IsRC returns true when the version has a prerelease suffix starting
// with "rc." (e.g. "rc.0", "rc.1").
func (v version) IsRC() bool {
return strings.HasPrefix(v.Pre, "rc.")
}
// rcNumber returns the numeric RC identifier (e.g. 0 for "rc.0").
// It returns -1 when the version is not an RC.
func (v version) rcNumber() int {
if !v.IsRC() {
return -1
}
n, err := strconv.Atoi(strings.TrimPrefix(v.Pre, "rc."))
if err != nil {
return -1
}
return n
}
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
}
if v.Patch != b.Patch {
return v.Patch > b.Patch
}
// A release without prerelease suffix is greater than one
// with a prerelease suffix (v2.32.0 > v2.32.0-rc.0).
if v.Pre == "" && b.Pre != "" {
return true
}
if v.Pre != "" && b.Pre == "" {
return false
}
// Both have prerelease: compare numerically for RC versions.
if v.IsRC() && b.IsRC() {
return v.rcNumber() > b.rcNumber()
}
// Fallback for non-RC prerelease strings.
return v.Pre > b.Pre
}
func (v version) Equal(b version) bool {
return v.Major == b.Major && v.Minor == b.Minor && v.Patch == b.Patch && v.Pre == b.Pre
}
// sortVersionsDesc sorts a slice of versions in descending order
// using semver-correct comparison. This is necessary because git's
// --sort=-v:refname treats pre-release suffixes (e.g. -rc.0) as
// greater than the release version, which is the opposite of semver
// where v2.32.0 > v2.32.0-rc.0.
func sortVersionsDesc(tags []version) {
sort.Slice(tags, func(i, j int) bool {
return tags[i].GreaterThan(tags[j])
})
}
// 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)
}
}
sortVersionsDesc(tags)
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)
}
}
sortVersionsDesc(tags)
return tags, nil
}