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mugit/internal/git/tags.go(view raw) 

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package git

import (
	"time"

	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/go-git/go-git/v5/plumbing/object"
)

type TagList struct {
	refs []*TagReference
	r    *git.Repository
}

// TagReference represents both lightweight and annotated tags.
// Lightweight tags contain only a reference.
// Annotated tags contain both a reference and tag metadata.
type TagReference struct {
	ref *plumbing.Reference
	tag *object.Tag
}

func (t *TagReference) Name() string {
	return t.ref.Name().Short()
}

func (t *TagReference) Message() string {
	if t.tag != nil {
		return t.tag.Message
	}
	return ""
}

func (t *TagList) Len() int {
	return len(t.refs)
}

func (t *TagList) Swap(i, j int) {
	t.refs[i], t.refs[j] = t.refs[j], t.refs[i]
}

// Less sorting tags in reverse chronological order
func (t *TagList) Less(i, j int) bool {
	return t.getDate(i).After(t.getDate(j))
}

func (t *TagList) getDate(i int) time.Time {
	if t.refs[i].tag != nil {
		return t.refs[i].tag.Tagger.When
	}
	c, err := t.r.CommitObject(t.refs[i].ref.Hash())
	if err != nil {
		return time.Now()
	}
	return c.Committer.When
}