feat(blog,fs): wrapppers for the std fs.FS and fs.File interfaces

blogo/fs.go

@@ -28,3 +28,62 @@ type File interface {
 	fs.File
 	Metadata() Metadata
 }
+
+type wrapperFS struct {
+	fs.FS
+	metadata  Metadata
+	immutable bool
+}
+
+func FsFS(f fs.FS, immutable ...bool) FS {
+	var m Metadata
+	var i bool
+	if len(immutable) > 0 && immutable[0] {
+		i = true
+		m = ImmutableMetadata(MetadataMap(map[string]any{}))
+	} else {
+		i = false
+		m = MetadataMap(map[string]any{})
+	}
+
+	return &wrapperFS{
+		FS:        f,
+		metadata:  m,
+		immutable: i,
+	}
+}
+
+func (f *wrapperFS) Metadata() Metadata {
+	return f.metadata
+}
+
+func (f *wrapperFS) Open(name string) (File, error) {
+	file, err := f.FS.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return FsFile(file, f.immutable), nil
+}
+
+type wrapperFile struct {
+	fs.File
+	metadata Metadata
+}
+
+func FsFile(f fs.File, immutable ...bool) File {
+	var m Metadata
+	if len(immutable) > 0 && immutable[0] {
+		m = ImmutableMetadata(MetadataMap(map[string]any{}))
+	} else {
+		m = MetadataMap(map[string]any{})
+	}
+
+	return &wrapperFile{
+		File:     f,
+		metadata: m,
+	}
+}
+
+func (f *wrapperFile) Metadata() Metadata {
+	return f.metadata
+}