Add recall command

This command allows recalling the selected postponed email to edit in
the composer. The command only allows recalling from the postpone
directory.

1 files changed, 141 insertions, 0 deletions

diff --git a/commands/msg/recall.go b/commands/msg/recall.go
new file mode 100644
index 0000000..c2f887a
--- /dev/null
+++ b/commands/msg/recall.go
@@ -0,0 +1,141 @@
+package msg
+
+import (
+	"io"
+
+	"github.com/emersion/go-message"
+	_ "github.com/emersion/go-message/charset"
+	"github.com/emersion/go-message/mail"
+	"github.com/pkg/errors"
+
+	"git.sr.ht/~sircmpwn/aerc/models"
+	"git.sr.ht/~sircmpwn/aerc/widgets"
+	"git.sr.ht/~sircmpwn/aerc/worker/types"
+)
+
+type Recall struct{}
+
+func init() {
+	register(Recall{})
+}
+
+func (Recall) Aliases() []string {
+	return []string{"recall"}
+}
+
+func (Recall) Complete(aerc *widgets.Aerc, args []string) []string {
+	return nil
+}
+
+func (Recall) Execute(aerc *widgets.Aerc, args []string) error {
+	if len(args) != 1 {
+		return errors.New("Usage: recall")
+	}
+
+	widget := aerc.SelectedTab().(widgets.ProvidesMessage)
+	acct := widget.SelectedAccount()
+	if acct == nil {
+		return errors.New("No account selected")
+	}
+	if acct.SelectedDirectory() != acct.AccountConfig().Postpone {
+		return errors.New("Can only recall from the postpone directory: " +
+			acct.AccountConfig().Postpone)
+	}
+	store := widget.Store()
+	if store == nil {
+		return errors.New("Cannot perform action. Messages still loading")
+	}
+
+	msgInfo, err := widget.SelectedMessage()
+	if err != nil {
+		return errors.Wrap(err, "Recall failed")
+	}
+	acct.Logger().Println("Recalling message " + msgInfo.Envelope.MessageId)
+
+	// copy the headers to the defaults map for addition to the composition
+	defaults := make(map[string]string)
+	headerFields := msgInfo.RFC822Headers.Fields()
+	for headerFields.Next() {
+		defaults[headerFields.Key()] = headerFields.Value()
+	}
+
+	composer, err := widgets.NewComposer(aerc, acct, aerc.Config(),
+		acct.AccountConfig(), acct.Worker(), "", defaults, models.OriginalMail{})
+	if err != nil {
+		return errors.Wrap(err, "Cannot open a new composer")
+	}
+
+	// focus the terminal since the header fields are likely already done
+	composer.FocusTerminal()
+
+	addTab := func() {
+		subject := msgInfo.Envelope.Subject
+		if subject == "" {
+			subject = "Recalled email"
+		}
+		tab := aerc.NewTab(composer, subject)
+		composer.OnHeaderChange("Subject", func(subject string) {
+			if subject == "" {
+				tab.Name = "New email"
+			} else {
+				tab.Name = subject
+			}
+			tab.Content.Invalidate()
+		})
+		composer.OnClose(func(composer *widgets.Composer) {
+			worker := composer.Worker()
+			uids := []uint32{msgInfo.Uid}
+
+			worker.PostAction(&types.DeleteMessages{
+				Uids: uids,
+			}, func(msg types.WorkerMessage) {
+				switch msg := msg.(type) {
+				case *types.Error:
+					aerc.PushError(" " + msg.Error.Error())
+					composer.Close()
+				}
+			})
+
+			return
+		})
+	}
+
+	// find the main body part and add it to the editor
+	// TODO: copy all parts of the message over?
+	var (
+		path []int
+		part *models.BodyStructure
+	)
+	if len(msgInfo.BodyStructure.Parts) != 0 {
+		part, path = findPlaintext(msgInfo.BodyStructure, path)
+	}
+	if part == nil {
+		part = msgInfo.BodyStructure
+		path = []int{1}
+	}
+
+	store.FetchBodyPart(msgInfo.Uid, part, path, func(reader io.Reader) {
+		header := message.Header{}
+		header.SetText(
+			"Content-Transfer-Encoding", part.Encoding)
+		header.SetContentType(part.MIMEType, part.Params)
+		header.SetText("Content-Description", part.Description)
+		entity, err := message.New(header, reader)
+		if err != nil {
+			// TODO: Do something with the error
+			addTab()
+			return
+		}
+		mreader := mail.NewReader(entity)
+		part, err := mreader.NextPart()
+		if err != nil {
+			// TODO: Do something with the error
+			addTab()
+			return
+		}
+		composer.SetContents(part.Body)
+		addTab()
+	})
+
+	return nil
+}