Add postpone command

This command uses the Postpone folder from the account config to save
messages to. Messages are saved as though they were sent so have a valid
'to' recipient address and should be able to be read back in for later
editing.

1 files changed, 119 insertions, 0 deletions

diff --git a/commands/compose/postpone.go b/commands/compose/postpone.go
new file mode 100644
index 0000000..44aa411
--- /dev/null
+++ b/commands/compose/postpone.go
@@ -0,0 +1,119 @@
+package compose
+
+import (
+	"io"
+	"io/ioutil"
+	"time"
+
+	"github.com/emersion/go-imap"
+	"github.com/miolini/datacounter"
+	"github.com/pkg/errors"
+
+	"git.sr.ht/~sircmpwn/aerc/widgets"
+	"git.sr.ht/~sircmpwn/aerc/worker/types"
+)
+
+type Postpone struct{}
+
+func init() {
+	register(Postpone{})
+}
+
+func (Postpone) Aliases() []string {
+	return []string{"postpone"}
+}
+
+func (Postpone) Complete(aerc *widgets.Aerc, args []string) []string {
+	return nil
+}
+
+func (Postpone) Execute(aerc *widgets.Aerc, args []string) error {
+	if len(args) != 1 {
+		return errors.New("Usage: postpone")
+	}
+	composer, _ := aerc.SelectedTab().(*widgets.Composer)
+	config := composer.Config()
+
+	if config.Postpone == "" {
+		return errors.New("No Postpone location configured")
+	}
+
+	aerc.Logger().Println("Postponing mail")
+
+	header, _, err := composer.PrepareHeader()
+	if err != nil {
+		return errors.Wrap(err, "PrepareHeader")
+	}
+	header.SetContentType("text/plain", map[string]string{"charset": "UTF-8"})
+	header.Set("Content-Transfer-Encoding", "quoted-printable")
+	worker := composer.Worker()
+	dirs := aerc.SelectedAccount().Directories().List()
+	alreadyCreated := false
+	for _, dir := range dirs {
+		if dir == config.Postpone {
+			alreadyCreated = true
+			break
+		}
+	}
+
+	errChan := make(chan string)
+
+	// run this as a goroutine so we can make other progress. The message
+	// will be saved once the directory is created.
+	go func() {
+		errStr := <-errChan
+		if errStr != "" {
+			aerc.PushError(" " + errStr)
+			return
+		}
+
+		aerc.RemoveTab(composer)
+		ctr := datacounter.NewWriterCounter(ioutil.Discard)
+		err = composer.WriteMessage(header, ctr)
+		if err != nil {
+			aerc.PushError(errors.Wrap(err, "WriteMessage").Error())
+			composer.Close()
+			return
+		}
+		nbytes := int(ctr.Count())
+		r, w := io.Pipe()
+		worker.PostAction(&types.AppendMessage{
+			Destination: config.Postpone,
+			Flags:       []string{imap.SeenFlag},
+			Date:        time.Now(),
+			Reader:      r,
+			Length:      int(nbytes),
+		}, func(msg types.WorkerMessage) {
+			switch msg := msg.(type) {
+			case *types.Done:
+				aerc.PushStatus("Message postponed.", 10*time.Second)
+				r.Close()
+				composer.Close()
+			case *types.Error:
+				aerc.PushError(" " + msg.Error.Error())
+				r.Close()
+				composer.Close()
+			}
+		})
+		composer.WriteMessage(header, w)
+		w.Close()
+	}()
+
+	if !alreadyCreated {
+		// to synchronise the creating of the directory
+		worker.PostAction(&types.CreateDirectory{
+			Directory: config.Postpone,
+		}, func(msg types.WorkerMessage) {
+			switch msg := msg.(type) {
+			case *types.Done:
+				errChan <- ""
+			case *types.Error:
+				errChan <- msg.Error.Error()
+			}
+		})
+	} else {
+		errChan <- ""
+	}
+
+	return nil
+}