Nesting MIME parts

[Paul Samways]

It seems the only way to create nested multipart/* parts with the std lib API is to specify the boundary after creating the nested multipart.Writer, is this correct? 

The CreatePart method contract kind of makes things more difficult than it should be. That is it requires the headers passed in, and it states that the returned io.Writer should be used to write the part's content, even though when looking at the implementation, neither restrictions are necessary(?).

i.e.

b := &bytes.Buffer{}

fmt.Fprint(b, "To: <y...@example.com>\r\n")

fmt.Fprint(b, "From: <m...@example.com>\r\n")

fmt.Fprint(b, "Subject: Test message\r\n")

wOuter := multipart.NewWriter(b)

fmt.Fprintf(b, "Content-Type: multipart/mixed; boundary=%v", wOuter.Boundary())

h := make(textproto.MIMEHeader)

h.Set("Content-Type", "multipart/alternative; boundary=boundary2")

w, _ := wOuter.CreatePart(h)

wInner := multipart.NewWriter(w)

wInner.SetBoundary("boundary2")

wInner.Close()

wOuter.Close()

[Brad Fitzpatrick]

Is this a bug report?

What do you want clarified or simplified?

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[Paul Samways]

Hi Brad,

I was hoping that I was missing something with Writer, it took me a minute to realise how to actually use it to write nested multiparts. Thought there may of been a better way which I wasn't seeing.

[Brad Fitzpatrick]

Seems nicely composable to me.  I don't think it needs any new API that's specific to nesting.