add new feature fetch upstream

options/locale/locale_en-US.ini

@@ -1241,6 +1241,10 @@ pulls.reject_count_1 = "%d change request"
 pulls.reject_count_n = "%d change requests"
 pulls.waiting_count_1 = "%d waiting review"
 pulls.waiting_count_n = "%d waiting reviews"
+pulls.commits_count_1=This branch is %d commit behind the upstream.
+pulls.commits_count_n=This branch is %d commit behind the upstream.
+pulls.fetch_upstream=Fetch upstream
+pulls.upstream_up_to_date=No new commits to fetch
 
 pulls.no_merge_desc = This pull request cannot be merged because all repository merge options are disabled.
 pulls.no_merge_helper = Enable merge options in the repository settings or merge the pull request manually.

options/locale/locale_zh-CN.ini

@@ -1243,6 +1243,10 @@ pulls.reject_count_1=%d 变更请求
 pulls.reject_count_n=%d 变更请求
 pulls.waiting_count_1=%d 个正在等待审核
 pulls.waiting_count_n=%d 个正在等待审核
+pulls.commits_count_1=当前分支落后上游分支 %d 个提交
+pulls.commits_count_n=当前分支落后上游分支 %d 个提交
+pulls.fetch_upstream=拉取上游更新
+pulls.upstream_up_to_date=上游分支没有新的更新
 
 pulls.no_merge_desc=由于未启用合并选项，此合并请求无法被合并。
 pulls.no_merge_helper=在项目设置中启用合并选项或者手工合并请求。

routers/repo/view.go

@@ -790,6 +790,41 @@ func renderCode(ctx *context.Context) {
 		}
 	}
 
+	//如果是fork的仓库
+	if ctx.Repo.Repository.IsFork {
+		//获得fetchUpstream对应的分支参数
+		/*
+			// 1. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headBranch}
+			// 2. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}:{:headBranch}
+			// 3. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}/{:headRepoName}:{:headBranch}
+		*/
+		baseGitRepo, err := git.OpenRepository(ctx.Repo.Repository.BaseRepo.RepoPath())
+		if err != nil {
+			log.Error("error open baseRepo:%s",ctx.Repo.Repository.BaseRepo.RepoPath())
+		}
+		defer baseGitRepo.Close()
+		if _,error:= baseGitRepo.GetBranch(ctx.Repo.BranchName);error==nil{
+			//base repo has the same branch, then compare between current repo branch and base repo's branch
+			compareUrl :=  ctx.Repo.BranchName + "..." + ctx.Repo.Repository.BaseRepo.OwnerName +  "/" + ctx.Repo.Repository.BaseRepo.Name + ":" + ctx.Repo.BranchName
+			ctx.SetParams("*",compareUrl)
+		}else{
+			//else, compare between current repo branch and base repo's default branch
+			compareUrl :=  ctx.Repo.BranchName + "..." + ctx.Repo.Repository.BaseRepo.OwnerName +  "/" + ctx.Repo.Repository.BaseRepo.Name + ":" + ctx.Repo.Repository.BaseRepo.DefaultBranch
+			ctx.SetParams("*",compareUrl)
+		}
+
+		_, _, headGitRepo, compareInfo, _, _ := ParseCompareInfo(ctx)
+		defer headGitRepo.Close()
+		if compareInfo!= nil {
+			if compareInfo.Commits!=nil {
+				log.Info("compareInfoCommits数量:%d",compareInfo.Commits.Len())
+				ctx.Data["FetchUpstreamCnt"] = compareInfo.Commits.Len()
+			}else{
+				log.Info("compareInfo nothing different")
+				ctx.Data["FetchUpstreamCnt"] = 0
+			}
+		}
+	}
 	ctx.Data["Paths"] = paths
 	ctx.Data["TreeLink"] = treeLink
 	ctx.Data["TreeNames"] = treeNames

templates/repo/home.tmpl

@@ -119,6 +119,17 @@
 						<a href="{{.BaseRepo.Link}}/compare/{{.BaseRepo.DefaultBranch | EscapePound}}...{{if ne .Repository.Owner.Name .BaseRepo.Owner.Name}}{{.Repository.Owner.Name}}:{{end}}{{.BranchName | EscapePound}}">
 							<button id="new-pull-request" class="ui compact basic button">{{if .PullRequestCtx.Allowed}}{{.i18n.Tr "repo.pulls.compare_changes"}}{{else}}{{.i18n.Tr "action.compare_branch"}}{{end}}</button>
 						</a>
+						{{if and .Repository.IsFork .PullRequestCtx.Allowed}}
+							{{if gt .FetchUpstreamCnt 0 }}
+								<a href="{{.Repository.Link}}/compare/{{.BranchName | EscapePound}}...{{.BaseRepo.Owner.Name}}:{{.BaseRepo.DefaultBranch | EscapePound}}">
+									<button id="new-pull-request" class="ui compact basic button" title="{{$.i18n.Tr (TrN $.i18n.Lang .FetchUpstreamCnt "repo.pulls.commits_count_1" "repo.pulls.commits_count_n") .FetchUpstreamCnt}}">{{.i18n.Tr "repo.pulls.fetch_upstream"}}</button>
+								</a>
+							{{else}}
+								<a href="{{.Repository.Link}}/compare/{{.BranchName | EscapePound}}...{{.BaseRepo.Owner.Name}}:{{.BaseRepo.DefaultBranch | EscapePound}}">
+									<button id="new-pull-request" class="ui compact basic button" title="{{.i18n.Tr "repo.pulls.upstream_up_to_date"}}">{{.i18n.Tr "repo.pulls.fetch_upstream"}}</button>
+								</a>
+							{{end}}
+						{{end}}
 					</div>
 				{{end}}
 			{{else}}