fix: support Gitea 28.0.0 mail templates

tools/preview/release_test.go

@@ -0,0 +1,53 @@
+package preview
+
+import (
+	"html/template"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea-mail-templates/tools/config"
+)
+
+// Gitea 28 removes FileSize, so render an attachment in every release theme.
+func TestReleaseAttachmentsGitea28(t *testing.T) {
+	if _, ok := TemplateFuncs["FileSize"]; ok {
+		t.Fatal("FileSize is not available in Gitea 28 mail templates")
+	}
+	cfg, err := config.Load(filepath.Join("..", "data", "templates_config.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	data := cfg.Templates["release"].Params
+	data["locale"] = Locale{}
+	markSafeHTML(data)
+
+	themesDir := filepath.Join("..", "..", "themes")
+	themes, err := os.ReadDir(themesDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, theme := range themes {
+		if !theme.IsDir() {
+			continue
+		}
+		t.Run(theme.Name(), func(t *testing.T) {
+			content, err := os.ReadFile(filepath.Join(themesDir, theme.Name(), "mail", "repo", "release.tmpl"))
+			if err != nil {
+				t.Fatal(err)
+			}
+			tmpl, err := template.New("release").Funcs(TemplateFuncs).Parse(string(content))
+			if err != nil {
+				t.Fatal(err)
+			}
+			var rendered strings.Builder
+			if err := tmpl.Execute(&rendered, data); err != nil {
+				t.Fatal(err)
+			}
+			if !strings.Contains(rendered.String(), "release-notes.txt") || !strings.Contains(rendered.String(), "1.5 KiB") {
+				t.Fatal("release attachment or formatted size missing from email")
+			}
+		})
+	}
+}