Add sorting functionality

There is a command and config option. The criteria are a list of the
sort criterion and each can be individually reversed.

This only includes support for sorting in the maildir backend currently.
The other backends are not supported in this patch.

1 files changed, 46 insertions, 7 deletions

diff --git a/worker/maildir/worker.go b/worker/maildir/worker.go
index 597e0d24..1df4e09c 100644
--- a/worker/maildir/worker.go
+++ b/worker/maildir/worker.go
@@ -12,6 +12,7 @@ import (
 
 	"git.sr.ht/~sircmpwn/aerc/models"
 	"git.sr.ht/~sircmpwn/aerc/worker/handlers"
+	"git.sr.ht/~sircmpwn/aerc/worker/lib"
 	"git.sr.ht/~sircmpwn/aerc/worker/types"
 )
 
@@ -23,11 +24,12 @@ var errUnsupported = fmt.Errorf("unsupported command")
 
 // A Worker handles interfacing between aerc's UI and a group of maildirs.
 type Worker struct {
-	c            *Container
-	selected     *maildir.Dir
-	selectedName string
-	worker       *types.Worker
-	watcher      *fsnotify.Watcher
+	c                   *Container
+	selected            *maildir.Dir
+	selectedName        string
+	worker              *types.Worker
+	watcher             *fsnotify.Watcher
+	currentSortCriteria []*types.SortCriterion
 }
 
 // NewWorker creates a new maildir worker with the provided worker.
@@ -86,8 +88,13 @@ func (w *Worker) handleFSEvent(ev fsnotify.Event) {
 		w.worker.Logger.Printf("could not scan UIDs: %v", err)
 		return
 	}
+	sortedUids, err := w.sort(uids, w.currentSortCriteria)
+	if err != nil {
+		w.worker.Logger.Printf("error sorting directory: %v", err)
+		return
+	}
 	w.worker.PostMessage(&types.DirectoryContents{
-		Uids: uids,
+		Uids: sortedUids,
 	}, nil)
 	dirInfo := w.getDirectoryInfo()
 	dirInfo.Recent = len(newUnseen)
@@ -271,13 +278,45 @@ func (w *Worker) handleFetchDirectoryContents(
 		w.worker.Logger.Printf("error scanning uids: %v", err)
 		return err
 	}
+	sortedUids, err := w.sort(uids, msg.SortCriteria)
+	if err != nil {
+		w.worker.Logger.Printf("error sorting directory: %v", err)
+		return err
+	}
+	w.currentSortCriteria = msg.SortCriteria
 	w.worker.PostMessage(&types.DirectoryContents{
 		Message: types.RespondTo(msg),
-		Uids:    uids,
+		Uids:    sortedUids,
 	}, nil)
 	return nil
 }
 
+func (w *Worker) sort(uids []uint32, criteria []*types.SortCriterion) ([]uint32, error) {
+	if len(criteria) == 0 {
+		return uids, nil
+	}
+	var msgInfos []*models.MessageInfo
+	for _, uid := range uids {
+		m, err := w.c.Message(*w.selected, uid)
+		if err != nil {
+			w.worker.Logger.Printf("could not get message: %v", err)
+			continue
+		}
+		info, err := m.MessageInfo()
+		if err != nil {
+			w.worker.Logger.Printf("could not get message info: %v", err)
+			continue
+		}
+		msgInfos = append(msgInfos, info)
+	}
+	sortedUids, err := lib.Sort(msgInfos, criteria)
+	if err != nil {
+		w.worker.Logger.Printf("could not sort the messages: %v", err)
+		return nil, err
+	}
+	return sortedUids, nil
+}
+
 func (w *Worker) handleCreateDirectory(msg *types.CreateDirectory) error {
 	dir := w.c.Dir(msg.Directory)
 	if err := dir.Create(); err != nil {