lib: implement an eml message view

Implement a MessageView representation for eml data that are not stored
in a message store. With this, we can display any rfc822 message data in
the message viewer.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

2 files changed, 19 insertions, 1 deletions

diff --git a/commands/msg/pipe.go b/commands/msg/pipe.go
index d0101675..4a5a6168 100644
--- a/commands/msg/pipe.go
+++ b/commands/msg/pipe.go
@@ -123,6 +123,18 @@ func (Pipe) Execute(aerc *widgets.Aerc, args []string) error {
 		h := newHelper(aerc)
 		store, err := h.store()
 		if err != nil {
+			if mv, ok := provider.(*widgets.MessageViewer); ok {
+				mv.MessageView().FetchFull(func(reader io.Reader) {
+					if background {
+						doExec(reader)
+					} else {
+						doTerm(reader,
+							fmt.Sprintf("%s <%s",
+								cmd[0], title))
+					}
+				})
+				return nil
+			}
 			return err
 		}
 		uids, err = h.markedOrSelectedUids()
@@ -215,7 +227,9 @@ func (Pipe) Execute(aerc *widgets.Aerc, args []string) error {
 			}
 		})
 	}
-	provider.Store().Marker().ClearVisualMark()
+	if store := provider.Store(); store != nil {
+		store.Marker().ClearVisualMark()
+	}
 	return nil
 }
 
diff --git a/commands/msgview/next.go b/commands/msgview/next.go
index 5df7847d..a32e358f 100644
--- a/commands/msgview/next.go
+++ b/commands/msgview/next.go
@@ -2,6 +2,7 @@ package msgview
 
 import (
 	"errors"
+	"fmt"
 
 	"git.sr.ht/~rjarry/aerc/commands/account"
 	"git.sr.ht/~rjarry/aerc/lib"
@@ -35,6 +36,9 @@ func (NextPrevMsg) Execute(aerc *widgets.Aerc, args []string) error {
 		return errors.New("No account selected")
 	}
 	store := mv.Store()
+	if store == nil {
+		return fmt.Errorf("Cannot perform action. No message store set.")
+	}
 	err = account.ExecuteNextPrevMessage(args, acct, pct, n)
 	if err != nil {
 		return err