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previous_tag.go
66 lines (56 loc) · 1.41 KB
/
previous_tag.go
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package pkg
import (
"context"
"errors"
"fmt"
"github.com/ahmetb/go-linq/v3"
"golang.org/x/mod/semver"
"strings"
"github.com/google/go-github/v42/github"
)
func PreviousTag(owner, repo, currentTag string) (string, error) {
if !valid(currentTag) {
return "", errors.New(fmt.Sprintf("invalid current tag: %s", currentTag))
}
tags, err := getTags(owner, repo)
if err != nil {
return "", err
}
t := linq.From(tags).Where(func(i interface{}) bool {
return valid(i.(string))
}).Where(func(i interface{}) bool {
return semver.Compare(wrap(currentTag), wrap(i.(string))) > 0
}).Sort(func(i, j interface{}) bool {
return semver.Compare(wrap(i.(string)), wrap(j.(string))) < 0
}).Last()
if t == nil {
return "", nil
}
return t.(string), nil
}
var getTags = func(owner string, repo string) ([]string, error) {
client := github.NewClient(nil)
tags, _, err := client.Repositories.ListTags(context.Background(), owner, repo, nil)
if err != nil {
return nil, err
}
if tags == nil {
return nil, fmt.Errorf("cannot find tags")
}
var t []string
linq.From(tags).Select(func(i interface{}) interface{} {
return i.(*github.RepositoryTag).GetName()
}).ToSlice(&t)
return t, nil
}
func valid(t string) bool {
t = wrap(t)
semValid := semver.IsValid(t)
return semValid && !strings.Contains(t, "rc")
}
func wrap(t string) string {
if !strings.HasPrefix(t, "v") {
t = fmt.Sprintf("v%s", t)
}
return t
}