Implement :{next,prev}-message

commands/next-folder.go

@@ -13,13 +13,13 @@ func init() {
 	Register("prev-folder", NextPrevFolder)
 }
 
-func usage(cmd string) error {
+func nextPrevFolderUsage(cmd string) error {
 	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
 }
 
 func NextPrevFolder(aerc *widgets.Aerc, args []string) error {
 	if len(args) > 2 {
-		return usage(args[0])
+		return nextPrevFolderUsage(args[0])
 	}
 	var (
 		n   int = 1
@@ -28,7 +28,7 @@ func NextPrevFolder(aerc *widgets.Aerc, args []string) error {
 	if len(args) > 1 {
 		n, err = strconv.Atoi(args[1])
 		if err != nil {
-			return usage(args[0])
+			return nextPrevFolderUsage(args[0])
 		}
 	}
 	acct := aerc.SelectedAccount()

commands/next-message.go

@@ -0,0 +1,43 @@
+package commands
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+
+	"git.sr.ht/~sircmpwn/aerc2/widgets"
+)
+
+func init() {
+	Register("next-message", NextPrevMessage)
+	Register("prev-message", NextPrevMessage)
+}
+
+func nextPrevMessageUsage(cmd string) error {
+	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
+}
+
+func NextPrevMessage(aerc *widgets.Aerc, args []string) error {
+	if len(args) > 2 {
+		return nextPrevMessageUsage(args[0])
+	}
+	var (
+		n   int = 1
+		err error
+	)
+	if len(args) > 1 {
+		n, err = strconv.Atoi(args[1])
+		if err != nil {
+			return nextPrevMessageUsage(args[0])
+		}
+	}
+	acct := aerc.SelectedAccount()
+	for ; n > 0; n-- {
+		if args[0] == "prev-message" {
+			acct.Messages().Prev()
+		} else {
+			acct.Messages().Next()
+		}
+	}
+	return nil
+}

widgets/account.go

@@ -172,6 +172,10 @@ func (acct *AccountView) Directories() *DirectoryList {
 	return acct.dirlist
 }
 
+func (acct *AccountView) Messages() *MessageList {
+	return acct.msglist
+}
+
 func (acct *AccountView) onMessage(msg types.WorkerMessage) {
 	switch msg := msg.(type) {
 	case *types.Done:

widgets/msglist.go

@@ -180,3 +180,23 @@ func (ml *MessageList) SetStore(store *MessageStore) {
 	}
 	ml.Invalidate()
 }
+
+func (ml *MessageList) nextPrev(delta int) {
+	ml.selected += delta
+	if ml.selected < 0 {
+		ml.selected = len(ml.store.Uids) - 1
+	}
+	if ml.selected >= len(ml.store.Uids) {
+		ml.selected = 0
+	}
+	// TODO: scrolling
+	ml.Invalidate()
+}
+
+func (ml *MessageList) Next() {
+	ml.nextPrev(1)
+}
+
+func (ml *MessageList) Prev() {
+	ml.nextPrev(-1)
+}