imap: ListMessages: handle body viewing, etc

internal/store/message.go

@@ -9,12 +9,18 @@ import (
 	"strings"
 )
 
+type MessageInterface interface {
+	CreateMessage(Message) error
+}
+
 type Message struct {
 	Maildir Maildir // maildir.name
 
-	UID      uint64
-	SeqNum   uint64
-	Key      string
+	UID    uint64
+	SeqNum uint64
+	Key    string
+
+	// Data is usually nil, but may be an io.ReadCloser if SetupData is called
 	Data     io.ReadCloser
 	hdrCache mail.Header
 }
@@ -54,10 +60,6 @@ func (m *Message) HeaderString() (string, error) {
 	return sb.String(), nil // FIXME
 }
 
-type MessageInterface interface {
-	CreateMessage(Message) error
-}
-
 // DeliverMessage takes the given message and delivers it to the correct maildir
 // It does not call Close() on message.Data
 func (c *concrete) CreateMessage(message Message) error {