Fix atom feed generation

dir.go

@@ -18,7 +18,7 @@ type Dir struct {
 	Pages   []*Page // Pages in this directory.
 	Dirs    []*Dir  // Subdirectories.
 	index   *Page   // The index page.
-	feeds   map[string][]byte // Feeds.
+	feed    []byte  // Atom feed.
 
 	inputExt    string // input file extension
 	outputExt   string // output file extension
@@ -34,7 +34,6 @@ func NewDir(path string) *Dir {
 	}
 	return &Dir{
 		Path: path,
-		feeds: map[string][]byte{},
 	}
 }
 
@@ -127,7 +126,7 @@ func (d *Dir) manipulate(cfg *Config) error {
 		if err := tmpl.Execute(&b, feed); err != nil {
 			return err
 		}
-		d.feeds[pathpkg.Join(d.Path, "atom.xml")] = b.Bytes()
+		d.feed = b.Bytes()
 	}
 
 	// Manipulate subdirectories
@@ -182,6 +181,20 @@ func (d *Dir) write(dstDir string, format Format) error {
 		}
 	}
 
+	// Write the atom feed
+	if d.feed != nil {
+		const path = "atom.xml"
+		dstPath := pathpkg.Join(dstDir, path)
+		os.MkdirAll(dstDir, 0755)
+		f, err := os.Create(dstPath)
+		if err != nil {
+			return err
+		}
+		if _, err := f.Write(d.feed); err != nil {
+			return err
+		}
+	}
+
 	// Write subdirectories
 	for _, dir := range d.Dirs {
 		dir.write(dstDir, format)