Added scalar output for TOML (#1617)

pkg/yqlib/encoder_toml.go

@@ -0,0 +1,34 @@
+package yqlib
+
+import (
+	"fmt"
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type tomlEncoder struct {
+}
+
+func NewTomlEncoder() Encoder {
+	return &tomlEncoder{}
+}
+
+func (te *tomlEncoder) Encode(writer io.Writer, node *yaml.Node) error {
+	if node.Kind == yaml.ScalarNode {
+		return writeString(writer, node.Value+"\n")
+	}
+	return fmt.Errorf("only scalars (e.g. strings, numbers, booleans) are supported for TOML output at the moment. Please use yaml output format (-oy) until the encoder has been fully implemented")
+}
+
+func (te *tomlEncoder) PrintDocumentSeparator(writer io.Writer) error {
+	return nil
+}
+
+func (te *tomlEncoder) PrintLeadingContent(writer io.Writer, content string) error {
+	return nil
+}
+
+func (te *tomlEncoder) CanHandleAliases() bool {
+	return false
+}