Support localized README (#20508)

* Support localized README

* Slightly simplify getting the readme file and add some tests. Ensure that i18n also
works for docs/ etc.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update modules/markup/renderer.go

* Update modules/markup/renderer.go

* Update modules/markup/renderer.go

Co-authored-by: Andrew Thornton <art27@cantab.net>

1 files changed, 63 insertions, 0 deletions

diff --git a/routers/web/repo/view_test.go b/routers/web/repo/view_test.go
new file mode 100644
index 0000000000..9d5a88fca4
--- /dev/null
+++ b/routers/web/repo/view_test.go
@@ -0,0 +1,63 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package repo
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_localizedExtensions(t *testing.T) {
+	tests := []struct {
+		name              string
+		ext               string
+		languageCode      string
+		wantLocalizedExts []string
+	}{
+		{
+			name:              "empty language",
+			ext:               ".md",
+			wantLocalizedExts: []string{".md"},
+		},
+		{
+			name:              "No region - lowercase",
+			languageCode:      "en",
+			ext:               ".csv",
+			wantLocalizedExts: []string{".en.csv", ".csv"},
+		},
+		{
+			name:              "No region - uppercase",
+			languageCode:      "FR",
+			ext:               ".txt",
+			wantLocalizedExts: []string{".fr.txt", ".txt"},
+		},
+		{
+			name:              "With region - lowercase",
+			languageCode:      "en-us",
+			ext:               ".md",
+			wantLocalizedExts: []string{".en-us.md", ".en_us.md", ".en.md", ".md"},
+		},
+		{
+			name:              "With region - uppercase",
+			languageCode:      "en-CA",
+			ext:               ".MD",
+			wantLocalizedExts: []string{".en-ca.MD", ".en_ca.MD", ".en.MD", ".MD"},
+		},
+		{
+			name:              "With region - all uppercase",
+			languageCode:      "ZH-TW",
+			ext:               ".md",
+			wantLocalizedExts: []string{".zh-tw.md", ".zh_tw.md", ".zh.md", ".md"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if gotLocalizedExts := localizedExtensions(tt.ext, tt.languageCode); !reflect.DeepEqual(gotLocalizedExts, tt.wantLocalizedExts) {
+				t.Errorf("localizedExtensions() = %v, want %v", gotLocalizedExts, tt.wantLocalizedExts)
+			}
+		})
+	}
+}