Simplify resources code, enabling any resource to be overridden (not just translations)

resources/banner.go

@@ -0,0 +1,19 @@
+package resources
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+
+	"github.com/navidrome/navidrome/consts"
+)
+
+func loadBanner() string {
+	data, _ := Asset("banner.txt")
+	return strings.TrimRightFunc(string(data), unicode.IsSpace)
+}
+
+func Banner() string {
+	version := "Version: " + consts.Version()
+	return fmt.Sprintf("%s\n%52s\n", loadBanner(), version)
+}

resources/embed.go

@@ -3,10 +3,19 @@ package resources
 import (
 	"embed"
 	"io"
+	"io/fs"
+	"os"
+	"path"
+
+	"github.com/navidrome/navidrome/conf"
+	"github.com/navidrome/navidrome/utils"
 )
 
-//go:embed *
-var FS embed.FS
+var (
+	//go:embed *
+	fsys embed.FS
+	FS   fs.FS
+)
 
 func Asset(path string) ([]byte, error) {
 	f, err := FS.Open(path)
@@ -15,3 +24,10 @@ func Asset(path string) ([]byte, error) {
 	}
 	return io.ReadAll(f)
 }
+
+func init() {
+	FS = utils.MergeFS{
+		Base:    fsys,
+		Overlay: os.DirFS(path.Join(conf.Server.DataFolder, "resources")),
+	}
+}