From e1b968f1981f21470a67ed617c36f1c6802bd0a7 Mon Sep 17 00:00:00 2001
From: Ben Firshman <ben@firshman.co.uk>
Date: Tue, 16 Sep 2014 10:44:15 -0700
Subject: [PATCH] Add support for multiple level CLI commands

E.g. "docker groups create" will attempt to call the function
CmdGroupsCreate

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
---
 api/client/cli.go      | 18 ++++++++++++++----
 api/client/commands.go |  7 +++++++
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/api/client/cli.go b/api/client/cli.go
index fa3be2d8d9..6346d30cac 100644
--- a/api/client/cli.go
+++ b/api/client/cli.go
@@ -35,11 +35,15 @@ var funcMap = template.FuncMap{
 	},
 }
 
-func (cli *DockerCli) getMethod(name string) (func(...string) error, bool) {
-	if len(name) == 0 {
-		return nil, false
+func (cli *DockerCli) getMethod(args ...string) (func(...string) error, bool) {
+	camelArgs := make([]string, len(args))
+	for i, s := range args {
+		if len(s) == 0 {
+			return nil, false
+		}
+		camelArgs[i] = strings.ToUpper(s[:1]) + strings.ToLower(s[1:])
 	}
-	methodName := "Cmd" + strings.ToUpper(name[:1]) + strings.ToLower(name[1:])
+	methodName := "Cmd" + strings.Join(camelArgs, "")
 	method := reflect.ValueOf(cli).MethodByName(methodName)
 	if !method.IsValid() {
 		return nil, false
@@ -49,6 +53,12 @@ func (cli *DockerCli) getMethod(name string) (func(...string) error, bool) {
 
 // Cmd executes the specified command
 func (cli *DockerCli) Cmd(args ...string) error {
+	if len(args) > 1 {
+		method, exists := cli.getMethod(args[:2]...)
+		if exists {
+			return method(args[2:]...)
+		}
+	}
 	if len(args) > 0 {
 		method, exists := cli.getMethod(args[0])
 		if !exists {
diff --git a/api/client/commands.go b/api/client/commands.go
index a41fdc6d85..081ee49093 100644
--- a/api/client/commands.go
+++ b/api/client/commands.go
@@ -46,6 +46,13 @@ const (
 )
 
 func (cli *DockerCli) CmdHelp(args ...string) error {
+	if len(args) > 1 {
+		method, exists := cli.getMethod(args[:2]...)
+		if exists {
+			method("--help")
+			return nil
+		}
+	}
 	if len(args) > 0 {
 		method, exists := cli.getMethod(args[0])
 		if !exists {