Add support for :rmdir

The `:rmdir` command removes the current directory (`-f` is required if
the directory is not empty).

This is not supported on the notmuch backend.

An issue with the maildir backend is that some sync programs (e.g.
offlineimap) may recover the directory after it is deleted.  They need
to specifically be configured to accept deletions, or special commands
need to be executed (e.g. `offlineimap --delete-folder`) to properly
delete folders.

A danger of using this on the IMAP backend is that it is possible for a
new message to be added to the directory and for aerc to not show it
immediately (due to a slow connection) - using `:rmdir` at this moment
(with `-f` if the directory already contains messages) would delete the
directory and the new message that just arrived (and all other
contents).  This is documented in aerc(1) so that users are aware of
possible risks.

5 files changed, 41 insertions, 0 deletions

diff --git a/worker/imap/remove.go b/worker/imap/remove.go
new file mode 100644
index 0000000..47b1f43
--- /dev/null
+++ b/worker/imap/remove.go
@@ -0,0 +1,19 @@
+package imap
+
+import (
+	"git.sr.ht/~sircmpwn/aerc/worker/types"
+)
+
+func (imapw *IMAPWorker) handleRemoveDirectory(msg *types.RemoveDirectory) {
+	if err := imapw.client.Delete(msg.Directory); err != nil {
+		if msg.Quiet {
+			return
+		}
+		imapw.worker.PostMessage(&types.Error{
+			Message: types.RespondTo(msg),
+			Error:   err,
+		}, nil)
+	} else {
+		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
+	}
+}
diff --git a/worker/imap/worker.go b/worker/imap/worker.go
index 0be51d7..c016af6 100644
--- a/worker/imap/worker.go
+++ b/worker/imap/worker.go
@@ -165,6 +165,8 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
 		w.handleFetchDirectoryContents(msg)
 	case *types.CreateDirectory:
 		w.handleCreateDirectory(msg)
+	case *types.RemoveDirectory:
+		w.handleRemoveDirectory(msg)
 	case *types.FetchMessageHeaders:
 		w.handleFetchMessageHeaders(msg)
 	case *types.FetchMessageBodyPart:
diff --git a/worker/maildir/worker.go b/worker/maildir/worker.go
index d1ff3c2..4a7ae51 100644
--- a/worker/maildir/worker.go
+++ b/worker/maildir/worker.go
@@ -186,6 +186,8 @@ func (w *Worker) handleMessage(msg types.WorkerMessage) error {
 		return w.handleFetchDirectoryContents(msg)
 	case *types.CreateDirectory:
 		return w.handleCreateDirectory(msg)
+	case *types.RemoveDirectory:
+		return w.handleRemoveDirectory(msg)
 	case *types.FetchMessageHeaders:
 		return w.handleFetchMessageHeaders(msg)
 	case *types.FetchMessageBodyPart:
@@ -362,6 +364,16 @@ func (w *Worker) handleCreateDirectory(msg *types.CreateDirectory) error {
 	return nil
 }
 
+func (w *Worker) handleRemoveDirectory(msg *types.RemoveDirectory) error {
+	dir := w.c.Dir(msg.Directory)
+	if err := os.RemoveAll(string(dir)); err != nil {
+		w.worker.Logger.Printf("could not remove directory %s: %v",
+			msg.Directory, err)
+		return err
+	}
+	return nil
+}
+
 func (w *Worker) handleFetchMessageHeaders(
 	msg *types.FetchMessageHeaders) error {
 	for _, uid := range msg.Uids {
diff --git a/worker/notmuch/worker.go b/worker/notmuch/worker.go
index f14b7ff..66d1cd2 100644
--- a/worker/notmuch/worker.go
+++ b/worker/notmuch/worker.go
@@ -131,6 +131,8 @@ func (w *worker) handleMessage(msg types.WorkerMessage) error {
 		// 	return w.handleAppendMessage(msg)
 		// case *types.CreateDirectory:
 		// 	return w.handleCreateDirectory(msg)
+		// case *types.RemoveDirectory:
+		//  return w.handleRemoveDirectory(msg)
 	}
 	return errUnsupported
 }
diff --git a/worker/types/messages.go b/worker/types/messages.go
index 374db81..ab0e545 100644
--- a/worker/types/messages.go
+++ b/worker/types/messages.go
@@ -92,6 +92,12 @@ type CreateDirectory struct {
 	Quiet     bool
 }
 
+type RemoveDirectory struct {
+	Message
+	Directory string
+	Quiet     bool
+}
+
 type FetchMessageHeaders struct {
 	Message
 	Uids []uint32