Add a -i flag to force showing 'index.html' in the output listing; by default do not show them.

internal/indexgen/indexgen_test.go

@@ -101,11 +101,13 @@ func TestHTMLTemplate(t *testing.T) {
 		Entries    []FileEntry
 		DirAppend  bool
 		OutputFile string
+		IsRoot     bool
 	}{
 		DirName:    "test-dir",
 		Entries:    []FileEntry{},
 		DirAppend:  false,
 		OutputFile: "index.html",
+		IsRoot:     false,
 	}
 
 	var buf bytes.Buffer
@@ -161,11 +163,13 @@ func TestHTMLTemplateWithEntries(t *testing.T) {
 		Entries    []FileEntry
 		DirAppend  bool
 		OutputFile string
+		IsRoot     bool
 	}{
 		DirName:    "test-dir",
 		Entries:    entries,
 		DirAppend:  false,
 		OutputFile: "index.html",
+		IsRoot:     false,
 	}
 
 	var buf bytes.Buffer