Add material icons for file list (#33837)

modules/fileicon/basic.go

@@ -0,0 +1,27 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package fileicon
+
+import (
+	"html/template"
+
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/svg"
+)
+
+func BasicThemeIcon(entry *git.TreeEntry) template.HTML {
+	svgName := "octicon-file"
+	switch {
+	case entry.IsLink():
+		svgName = "octicon-file-symlink-file"
+		if te, err := entry.FollowLink(); err == nil && te.IsDir() {
+			svgName = "octicon-file-directory-symlink"
+		}
+	case entry.IsDir():
+		svgName = "octicon-file-directory-fill"
+	case entry.IsSubModule():
+		svgName = "octicon-file-submodule"
+	}
+	return svg.RenderHTML(svgName)
+}