From b5485ca03d6e4e098c1307c6cee662d9b3ac74c4 Mon Sep 17 00:00:00 2001
From: Gusted <williamzijl7@hotmail.com>
Date: Mon, 22 Aug 2022 14:41:58 +0200
Subject: [PATCH]  Don't open new page for ext wiki on same repository (#20725)

- Backport of #20725
  - When the external wiki has been set to a file on the repository, don't open the page on a tab.
  - Resolves #20657
---
 modules/templates/helper.go | 1 +
 templates/repo/header.tmpl  | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 537ef71ccf5e..359b5db2f087 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -574,6 +574,7 @@ func NewTextFuncMap() []texttmpl.FuncMap {
 			return sum
 		},
 		"QueryEscape": url.QueryEscape,
+		"HasPrefix": strings.HasPrefix,
 	}}
 }
 
diff --git a/templates/repo/header.tmpl b/templates/repo/header.tmpl
index 94ae5ed7e215..a2f31fc9503b 100644
--- a/templates/repo/header.tmpl
+++ b/templates/repo/header.tmpl
@@ -206,7 +206,7 @@
 				{{end}}
 
 				{{if or (.Permission.CanRead $.UnitTypeWiki) (.Permission.CanRead $.UnitTypeExternalWiki)}}
-					<a class="{{if .PageIsWiki}}active{{end}} item" href="{{.RepoLink}}/wiki" {{if (.Permission.CanRead $.UnitTypeExternalWiki)}} target="_blank" rel="noopener noreferrer" {{end}}>
+					<a class="{{if .PageIsWiki}}active{{end}} item" href="{{.RepoLink}}/wiki" {{if and (.Permission.CanRead $.UnitTypeExternalWiki) (not (HasPrefix ((.Repository.MustGetUnit $.UnitTypeExternalWiki).ExternalWikiConfig.ExternalWikiURL) (.Repository.HTMLURL)))}} target="_blank" rel="noopener noreferrer" {{end}}>
 						{{svg "octicon-book"}} {{.i18n.Tr "repo.wiki"}}
 					</a>
 				{{end}}