Update vendor/

vendor/github.com/emersion/go-message/mail/writer.go

@@ -0,0 +1,73 @@
+package mail
+
+import (
+	"io"
+
+	"github.com/emersion/go-message"
+)
+
+// A Writer writes a mail message. A mail message contains one or more text
+// parts and zero or more attachments.
+type Writer struct {
+	mw *message.Writer
+}
+
+// CreateWriter writes a mail header to w and creates a new Writer.
+func CreateWriter(w io.Writer, header Header) (*Writer, error) {
+	header.Set("Content-Type", "multipart/mixed")
+
+	mw, err := message.CreateWriter(w, header.Header)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Writer{mw}, nil
+}
+
+// CreateText creates a TextWriter. One or more parts representing the same text
+// in different formats can be written to a TextWriter.
+func (w *Writer) CreateText() (*TextWriter, error) {
+	h := make(message.Header)
+	h.Set("Content-Type", "multipart/alternative")
+
+	mw, err := w.mw.CreatePart(h)
+	if err != nil {
+		return nil, err
+	}
+	return &TextWriter{mw}, nil
+}
+
+// CreateSingleText creates a new single text part with the provided header. The
+// body of the part should be written to the returned io.WriteCloser. Only one
+// single text part should be written, use CreateText if you want multiple text
+// parts.
+func (w *Writer) CreateSingleText(header TextHeader) (io.WriteCloser, error) {
+	return w.mw.CreatePart(header.Header)
+}
+
+// CreateAttachment creates a new attachment with the provided header. The body
+// of the part should be written to the returned io.WriteCloser.
+func (w *Writer) CreateAttachment(header AttachmentHeader) (io.WriteCloser, error) {
+	return w.mw.CreatePart(header.Header)
+}
+
+// Close finishes the Writer.
+func (w *Writer) Close() error {
+	return w.mw.Close()
+}
+
+// TextWriter writes a mail message's text.
+type TextWriter struct {
+	mw *message.Writer
+}
+
+// CreatePart creates a new text part with the provided header. The body of the
+// part should be written to the returned io.WriteCloser.
+func (w *TextWriter) CreatePart(header TextHeader) (io.WriteCloser, error) {
+	return w.mw.CreatePart(header.Header)
+}
+
+// Close finishes the TextWriter.
+func (w *TextWriter) Close() error {
+	return w.mw.Close()
+}