Show in Web UI if file is vendored and generated (#28620)

This simple shows in the Web UI is a file is vendored and/or generated.


![grafik](https://github.com/go-gitea/gitea/assets/15185051/bfe45fcc-cfec-4ba1-8d93-c0a262c3ae1c)

![grafik](https://github.com/go-gitea/gitea/assets/15185051/9f222a49-e7bf-4540-ba64-43dcc5767b76)

---------

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

options/locale/locale_en-US.ini

@@ -1191,6 +1191,8 @@ audio_not_supported_in_browser = Your browser does not support the HTML5 'audio'
 stored_lfs = Stored with Git LFS
 symbolic_link = Symbolic link
 executable_file = Executable File
+vendored = Vendored
+generated = Generated
 commit_graph = Commit Graph
 commit_graph.select = Select branches
 commit_graph.hide_pr_refs = Hide Pull Requests

routers/web/repo/view.go

@@ -647,6 +647,21 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry) {
 		}
 	}
 
+	if ctx.Repo.GitRepo != nil {
+		checker, deferable := ctx.Repo.GitRepo.CheckAttributeReader(ctx.Repo.CommitID)
+		if checker != nil {
+			defer deferable()
+			attrs, err := checker.CheckPath(ctx.Repo.TreePath)
+			if err == nil {
+				vendored, has := attrs["linguist-vendored"]
+				ctx.Data["IsVendored"] = has && (vendored == "set" || vendored == "true")
+
+				generated, has := attrs["linguist-generated"]
+				ctx.Data["IsGenerated"] = has && (generated == "set" || generated == "true")
+			}
+		}
+	}
+
 	if fInfo.st.IsImage() && !fInfo.st.IsSvgImage() {
 		img, _, err := image.DecodeConfig(bytes.NewReader(buf))
 		if err == nil {

templates/repo/file_info.tmpl

@@ -30,6 +30,16 @@
 			{{ctx.Locale.Tr "repo.executable_file"}}
 		</div>
 	{{end}}
+	{{if .IsVendored}}
+		<div class="file-info-entry">
+			{{ctx.Locale.Tr "repo.vendored"}}
+		</div>
+	{{end}}
+	{{if .IsGenerated}}
+		<div class="file-info-entry">
+			{{ctx.Locale.Tr "repo.generated"}}
+		</div>
+	{{end}}
 	{{if .ImageSize}}
 		<div class="file-info-entry">
 			{{.ImageSize}}