.

t/neo/zodb/cmd/zodb/zodb.go

+// Copyright (C) 2017  Nexedi SA and Contributors.
+//                     Kirill Smelkov <kirr@nexedi.com>
+//
+// This program is free software: you can Use, Study, Modify and Redistribute
+// it under the terms of the GNU General Public License version 3, or (at your
+// option) any later version, as published by the Free Software Foundation.
+//
+// You can also Link and Combine this program with other software covered by
+// the terms of any of the Open Source Initiative approved licenses and Convey
+// the resulting work. Corresponding source of such a combination shall include
+// the source code for all other software used.
+//
+// This program is distributed WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+// See COPYING file for full licensing terms.
+
+// Zodb is a driver program for invoking zodbtools subcommands
+package main
+
+import (
+)
+
+
+var commandv = []Command{
+	// TODO analyze ?
+	// TODO cmp
+	{"dump", zodbtools.DumpMain},
+	{"info", zodbtools.InfoMain},
+}
+
+func usage() {
+	w := os.Stderr
+	fmt.Fprintf(w,
+`Zodb is a tool for managing ZODB databases.
+
+Usage:
+
+	zodb command [arguments]
+
+The commands are:
+`)
+	// TODO print commands
+	fmt.Fprintf(w,
+`
+
+Use "zodb help [command]" for more information about a command.
+
+Additional help topics:
+`)
+
+	// TODO print help topics
+
+	fmt.Fprintf(w,
+`
+
+Use "zodb help [topic]" for more information about that topic.
+`)
+}
+
+
+// help shows general help or help for a command/topic
+func help(argv []string) {
+	if len(argv) < 2 {	// help topic ...
+		usage()
+		os.Exit(2)
+	}
+
+	topic := argv[1]
+
+	// topic can either be a command name or a help topic
+	command -> usage(os.Stdout)
+
+	// TODO topic
+
+
+	fmt.Fprintf(os.Stderr, "Unknown help topic `%s`.  Run 'zodb help'.", topic)
+	os.Exit(2)
+}
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+	argv := flag.Args()
+
+	if len(argv) == 0 {
+		usage()
+		os.Exit(2)
+	}
+
+	command = argv[0]
+
+	// help on a topic
+	if command == "help" {
+		help(argv)
+		return
+	}
+
+	// run subcommand
+	cmd, ok := commandDir[command]
+	if !ok {
+		fmt.Fprintf(os.Stderr, "zodb: unknown subcommand \"%s\"", command)
+		fmt.Fprintf(os.Stderr, "Run 'zodb help' for usage.")
+		os.Exit(2)
+	}
+
+	cmd.Main(argv)
+}