Add ref issue when creating pull request from issue

options/locale/locale_en-US.ini

@@ -1627,6 +1627,7 @@ issues.maybefixed = May be fixed by %s
 issues.create_branch_from_issue_success = Create branch %s from issue successfully
 issues.pr.completed = Completed
 issues.pr.conflicted = Merge conflicts
+issues.pr.not_exist_issue = Reference issue does not exist.
 issues.branch.latest = Latest commit %s
 issues.link.created = Created %s
 issues.num_participants = %d Participants

routers/web/repo/compare.go

@@ -845,6 +845,21 @@ func CompareDiff(ctx *context.Context) {
 		ctx.Data["AllowMaintainerEdit"] = false
 	}
 
+	refIssueIndex := ctx.FormInt64("ref_issue_index")
+	if refIssueIndex > 0 {
+		refIssue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, refIssueIndex)
+		if err != nil {
+			ctx.Flash.Warning(ctx.Tr("repo.issues.pr.not_exist_issue"), true)
+		} else {
+			keyword := "Resolve"
+			if len(setting.Repository.PullRequest.CloseKeywords) > 0 {
+				keyword = setting.Repository.PullRequest.CloseKeywords[0]
+			}
+			ctx.Data["TitleQuery"] = fmt.Sprintf("%s %s", keyword, refIssue.Title)
+			ctx.Data["BodyQuery"] = fmt.Sprintf("%s #%d", keyword, refIssueIndex)
+		}
+	}
+
 	ctx.HTML(http.StatusOK, tplCompare)
 }
 

templates/repo/issue/view_content/sidebar_development.tmpl

@@ -33,7 +33,7 @@
 				</a>
 			</div>
 			<div class="tw-right">
-				<a class="ui button mini compact basic icon" href="{{$.Issue.Repo.Link}}/compare/{{$.Issue.Repo.DefaultBranch}}...{{.Branch.Repo.FullName}}:{{.Branch.Name}}">
+				<a class="ui button mini compact basic icon" href="{{$.Issue.Repo.Link}}/compare/{{$.Issue.Repo.DefaultBranch}}...{{.Branch.Repo.FullName}}:{{.Branch.Name}}?ref_issue_index={{$.Issue.Index}}">
 				{{svg "octicon-git-pull-request"}}
 				</a>
 			</div>