Implement basic tab completion support

Tab completion currently only works on commands. Contextual completion
will be added in the future.

1 files changed, 14 insertions, 5 deletions

diff --git a/commands/compose/next-field.go b/commands/compose/next-field.go
index a10aa32..3496dfd 100644
--- a/commands/compose/next-field.go
+++ b/commands/compose/next-field.go
@@ -7,16 +7,21 @@ import (
 	"git.sr.ht/~sircmpwn/aerc/widgets"
 )
 
+type NextPrevField struct{}
+
 func init() {
-	register("next-field", NextPrevField)
-	register("prev-field", NextPrevField)
+	register(NextPrevField{})
 }
 
-func nextPrevFieldUsage(cmd string) error {
-	return errors.New(fmt.Sprintf("Usage: %s", cmd))
+func (_ NextPrevField) Aliases() []string {
+	return []string{"next-field", "prev-field"}
+}
+
+func (_ NextPrevField) Complete(aerc *widgets.Aerc, args []string) []string {
+	return nil
 }
 
-func NextPrevField(aerc *widgets.Aerc, args []string) error {
+func (_ NextPrevField) Execute(aerc *widgets.Aerc, args []string) error {
 	if len(args) > 2 {
 		return nextPrevFieldUsage(args[0])
 	}
@@ -28,3 +33,7 @@ func NextPrevField(aerc *widgets.Aerc, args []string) error {
 	}
 	return nil
 }
+
+func nextPrevFieldUsage(cmd string) error {
+	return errors.New(fmt.Sprintf("Usage: %s", cmd))
+}