From fd2d645c1a55947ea54ed68f050b014f649656a3 Mon Sep 17 00:00:00 2001
From: zouap <zouap@pcl.ac.cn>
Date: Mon, 10 Jan 2022 15:57:12 +0800
Subject: [PATCH] =?UTF-8?q?=E6=8F=90=E4=BA=A4=E4=BB=A3=E7=A0=81=E3=80=82?=
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Signed-off-by: zouap <zouap@pcl.ac.cn>
---
 models/repo.go | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/models/repo.go b/models/repo.go
index 6863004a6..e5cc5831d 100755
--- a/models/repo.go
+++ b/models/repo.go
@@ -13,6 +13,7 @@ import (
 	"html/template"
 	"math/rand"
 
+	"code.gitea.io/gitea/modules/git"
 	"xorm.io/xorm"
 
 	"code.gitea.io/gitea/modules/blockchain"
@@ -2559,6 +2560,56 @@ func UpdateRepositoryCommitNum(repo *Repository) error {
 	return nil
 }
 
+type RepoFile struct {
+	CommitId string
+	Content  []byte
+}
+
+// ReadLatestFileInRepo read latest version of file in repository
+// return a RepoFile
+func ReadLatestFileInRepo(userName, repoName, refName, treePath string) (*RepoFile, error) {
+	var err error
+	repoPath := RepoPath(userName, repoName)
+	gitRepo, err := git.OpenRepository(repoPath)
+	if err != nil {
+		log.Error("ReadLatestFileInRepo error when OpenRepository,error=%v", err)
+		return nil, err
+	}
+	commitID, err := gitRepo.GetBranchCommitID(refName)
+	if err != nil {
+		log.Error("ReadLatestFileInRepo error when GetBranchCommitID,error=%v", err)
+		return nil, err
+	}
+	commit, err := gitRepo.GetBranchCommit(refName)
+	if err != nil {
+		log.Error("ReadLatestFileInRepo error when GetBranchCommit,error=%v", err)
+		return nil, err
+	}
+
+	blob, err := commit.GetBlobByPath(treePath)
+	if err != nil {
+		log.Error("ReadLatestFileInRepo error when GetBlobByPath,error=%v", err)
+		return nil, err
+	}
+
+	reader, err := blob.DataAsync()
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err = reader.Close(); err != nil {
+			log.Error("ReadLatestFileInRepo: Close: %v", err)
+		}
+	}()
+
+	buf := make([]byte, 1024)
+	n, _ := reader.Read(buf)
+	if n >= 0 {
+		buf = buf[:n]
+	}
+	return &RepoFile{CommitId: commitID, Content: buf}, nil
+}
+
 func GenerateDefaultRepoName(ownerName string) string {
 	if len(ownerName) > 5 {
 		ownerName = ownerName[:5]