Split lfs size from repository size (#22900)

releated to #21820

- Split `Size` in repository table as two new colunms, one is `GitSize`
for git size, the other is `LFSSize` for lfs data. still store full size
in `Size` colunm.
- Show full size on ui, but show each of them by a `title`;  example:

![image](https://user-images.githubusercontent.com/25342410/218636251-e200f085-d7e7-4a25-9ff1-b586a63e07a9.png)

- Return full size in api response.

---------

Signed-off-by: a1012112796 <1012112796@qq.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: DmitryFrolovTri <23313323+DmitryFrolovTri@users.noreply.github.com>
Co-authored-by: Giteabot <teabot@gitea.io>

models/repo/repo.go

@@ -16,6 +16,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/setting"
@@ -163,6 +164,8 @@ type Repository struct {
 	IsTemplate                      bool               `xorm:"INDEX NOT NULL DEFAULT false"`
 	TemplateID                      int64              `xorm:"INDEX"`
 	Size                            int64              `xorm:"NOT NULL DEFAULT 0"`
+	GitSize                         int64              `xorm:"NOT NULL DEFAULT 0"`
+	LFSSize                         int64              `xorm:"NOT NULL DEFAULT 0"`
 	CodeIndexerStatus               *RepoIndexerStatus `xorm:"-"`
 	StatsIndexerStatus              *RepoIndexerStatus `xorm:"-"`
 	IsFsckEnabled                   bool               `xorm:"NOT NULL DEFAULT true"`
@@ -196,6 +199,42 @@ func (repo *Repository) SanitizedOriginalURL() string {
 	return u.String()
 }
 
+// text representations to be returned in SizeDetail.Name
+const (
+	SizeDetailNameGit = "git"
+	SizeDetailNameLFS = "lfs"
+)
+
+type SizeDetail struct {
+	Name string
+	Size int64
+}
+
+// SizeDetails forms a struct with various size details about repository
+func (repo *Repository) SizeDetails() []SizeDetail {
+	sizeDetails := []SizeDetail{
+		{
+			Name: SizeDetailNameGit,
+			Size: repo.GitSize,
+		},
+		{
+			Name: SizeDetailNameLFS,
+			Size: repo.LFSSize,
+		},
+	}
+	return sizeDetails
+}
+
+// SizeDetailsString returns a concatenation of all repository size details as a string
+func (repo *Repository) SizeDetailsString() string {
+	var str strings.Builder
+	sizeDetails := repo.SizeDetails()
+	for _, detail := range sizeDetails {
+		str.WriteString(fmt.Sprintf("%s: %s, ", detail.Name, base.FileSize(detail.Size)))
+	}
+	return strings.TrimSuffix(str.String(), ", ")
+}
+
 func (repo *Repository) LogString() string {
 	if repo == nil {
 		return "<Repository nil>"