--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmd/sievemgr/command.go	Thu Oct 15 09:11:05 2020 +0200
@@ -0,0 +1,45 @@
+// Copyright (C) 2020 Guido Berhoerster <guido+managesieve@berhoerster.name>
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"strings"
+)
+
+type command struct {
+	UsageLine string
+	Flag      flag.FlagSet
+	Run       func(cmd *command, args []string) error
+}
+
+func (c *command) Usage() {
+	fmt.Fprintf(flag.CommandLine.Output(), "usage:\n  %s %s\n",
+		flag.CommandLine.Name(), c.UsageLine)
+	fmt.Fprintln(flag.CommandLine.Output(), "options:")
+	c.Flag.PrintDefaults()
+}
+
+func (c *command) Name() string {
+	return strings.SplitN(strings.Trim(c.UsageLine, " "), " ", 2)[0]
+}