.

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

@@ -39,7 +39,6 @@ Usage:
 The commands are:
 
 `)
-	// TODO print commands
 	for _, cmd := range zodbtools.AllCommands() {
 		fmt.Fprintf(w, "\t%-11s %s\n", cmd.Name, cmd.Summary)
 	}
@@ -50,14 +49,17 @@ The commands are:
 Use "zodb help [command]" for more information about a command.
 
 Additional help topics:
+
 `)
 
-	// TODO print help topics
+	for _, topic := range zodbtools.AllHelpTopics() {
+		fmt.Fprintf(w, "\t%-11s %s\n", topic.Name, topic.Summary)
+	}
 
 	fmt.Fprintf(w,
 `
-
 Use "zodb help [topic]" for more information about that topic.
+
 `)
 }
 
@@ -78,8 +80,11 @@ func help(argv []string) {
 		os.Exit(0)
 	}
 
-	// TODO topic
-
+	helpTopic := zodbtools.LookupHelpTopic(topic)
+	if helpTopic != nil {
+		fmt.Println(helpTopic.Text)
+		os.Exit(0)
+	}
 
 	fmt.Fprintf(os.Stderr, "Unknown help topic `%s`.  Run 'zodb help'.\n", topic)
 	os.Exit(2)

t/neo/zodb/zodbtools/command.go

@@ -16,6 +16,7 @@
 // See COPYING file for full licensing terms.
 
 package zodbtools
+// registry for all commands
 
 import (
 	"io"

t/neo/zodb/zodbtools/help.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.
+
+package zodbtools
+// registry for all help topics
+
+type HelpTopic struct {
+	Name    string
+	Summary string
+	Text    string
+}
+
+const helpZURL =
+`Almost every zodb command works with a database.
+A database can be specified by way of providing URL for its storage.
+
+The most general way to specify a storage is via preparing file with
+ZConfig-based storage definition, e.g.
+
+    %import neo.client
+    <NEOStorage>
+        master_nodes    ...
+        name            ...
+    </NEOStorage>
+
+and using path to that file with zconfig:// schema:
+
+    zconfig://<path-to-zconfig-storage-definition>
+
+There are also following simpler ways:
+
+- neo://<db>@<master>   for a NEO database
+- zeo://<host>:<port>   for a ZEO database
+- /path/to/file         for a FileStorage database
+
+Please see zodburi documentation for full details:
+
+http://docs.pylonsproject.org/projects/zodburi/
+`
+
+var helpv = []HelpTopic{
+	{"zurl", "specifying database URL", helpZURL},
+}
+
+// LookupHelpTopic returns HelpTopic with corresponding name or nil
+func LookupHelpTopic(topic string) *HelpTopic {
+	for i := range helpv {
+		if helpv[i].Name == topic {
+			return &helpv[i]
+		}
+	}
+	return nil
+}
+
+// AllHelpTopics returns list of all zodbtools help topics
+func AllHelpTopics() []HelpTopic {
+	return helpv
+}