Added button to copy file name in PR files (#35509)

The merge request file viewer has a button for copying the file path,
but it is not always convenient. Often, you only want to copy the file
name, which is currently not possible. This change request adds this
capability.

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: a.kiselev <a.kiselev@reglab.ru>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Author: 3 people

options/locale/locale_en-US.ini

@@ -109,6 +109,7 @@ copy_path = Copy path
 copy_success = Copied!
 copy_error = Copy failed
 copy_type_unsupported = This file type cannot be copied
+copy_filename = Copy filename
 
 write = Write
 preview = Preview

services/gitdiff/gitdiff.go

@@ -13,6 +13,7 @@ import (
 	"html/template"
 	"io"
 	"net/url"
+	"path"
 	"sort"
 	"strings"
 	"time"
@@ -403,6 +404,14 @@ func (diffFile *DiffFile) GetDiffFileName() string {
 	return diffFile.Name
 }
 
+// GetDiffFileBaseName returns the short name of the diff file, or its short old name in case it was deleted
+func (diffFile *DiffFile) GetDiffFileBaseName() string {
+	if diffFile.Name == "" {
+		return path.Base(diffFile.OldName)
+	}
+	return path.Base(diffFile.Name)
+}
+
 func (diffFile *DiffFile) ShouldBeHidden() bool {
 	return diffFile.IsGenerated || diffFile.IsViewed
 }

templates/repo/diff/box.tmpl

@@ -143,6 +143,7 @@
 											<button class="unescape-button item" data-unicode-content-selector="#diff-{{$file.NameHash}}">{{ctx.Locale.Tr "repo.unescape_control_characters"}}</button>
 											<button class="escape-button tw-hidden item" data-unicode-content-selector="#diff-{{$file.NameHash}}">{{ctx.Locale.Tr "repo.escape_control_characters"}}</button>
 										{{end}}
+										<button class="item" data-clipboard-text="{{$file.GetDiffFileBaseName}}">{{ctx.Locale.Tr "copy_filename"}}</button>
 										{{if not $.PageIsWiki}}
 											{{if $file.IsDeleted}}
 												<a class="item" rel="nofollow" href="{{$.BeforeSourcePath}}/{{PathEscapeSegments .Name}}">{{ctx.Locale.Tr "repo.diff.view_file"}}</a>