Implement schemagen ignore-indexes flag

Co-authored by Alexander Setzer <Alexander.Setzer@alfatraining.de>

cmd/schemagen/schemagen.go

@@ -28,6 +28,7 @@ var (
 	flagUser          = cmd.String("user", "", "user for password authentication")
 	flagPassword      = cmd.String("password", "", "password for password authentication")
 	flagIgnoreNames   = cmd.String("ignore-names", "", "a comma-separated list of table, view or index names to ignore")
+	flagIgnoreIndexes = cmd.Bool("ignore-indexes", false, "don't generate types for indexes")
 )
 
 var (
@@ -88,6 +89,13 @@ func renderTemplate(md *gocql.KeyspaceMetadata) ([]byte, error) {
 	for _, ignoredName := range strings.Split(*flagIgnoreNames, ",") {
 		ignoredNames[ignoredName] = struct{}{}
 	}
+	if *flagIgnoreIndexes {
+		for name := range md.Tables {
+			if strings.HasSuffix(name, "_index") {
+				ignoredNames[name] = struct{}{}
+			}
+		}
+	}
 	for name := range ignoredNames {
 		delete(md.Tables, name)
 	}

cmd/schemagen/schemagen_test.go

@@ -25,6 +25,8 @@ func TestSchemagen(t *testing.T) {
 		"composers_by_name",
 		"label",
 	}, ",")
+	*flagIgnoreIndexes = true
+
 	b := runSchemagen(t, "foobar")
 
 	const goldenFile = "testdata/models.go.txt"
@@ -153,6 +155,11 @@ func createTestSchema(t *testing.T) {
 		t.Fatal("create table:", err)
 	}
 
+	err = session.ExecStmt(`CREATE INDEX IF NOT EXISTS songs_title ON schemagen.songs (title)`)
+	if err != nil {
+		t.Fatal("create index:", err)
+	}
+
 	err = session.ExecStmt(`CREATE TABLE IF NOT EXISTS schemagen.composers (
 		id uuid PRIMARY KEY,
 		name text)`)