add delete command

main.go

@@ -86,7 +86,16 @@ func list(path *string) func(*cli.Cmd) {
 }
 
 func _delete(path *string) func(*cli.Cmd) {
-	return func(cmd *cli.Cmd) {}
+	return func(cmd *cli.Cmd) {
+		cmd.Spec = "[OPTIONS] TASK_ID"
+		var taskID = cmd.IntArg("TASK_ID", -1, "task to delete")
+		cmd.Action = func() {
+			db, err := NewStore(*path)
+			maybe(err)
+			defer db.Close()
+			maybe(db.DeleteTask(*taskID))
+		}
+	}
 }
 
 func main() {

store.go

@@ -108,6 +108,24 @@ func (s Store) ReadRecords(taskID int) ([]*Record, error) {
 	return records, nil
 }
 
+func (s Store) DeleteTask(taskID int) error {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM task WHERE rowid = $1", &taskID)
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM record WHERE task_id = $1", &taskID)
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	return tx.Commit()
+}
+
 func (s Store) Close() error { return s.db.Close() }
 
 func initDB(db *Store) error {