cli: Make sure to add --help flag for subcommands. (#3773)

--help is now back and prints properly with command
help template.

cmd/main.go

@@ -104,6 +104,10 @@ func registerApp() *cli.App {
 	registerCommand(updateCmd)
 
 	// Set up app.
+	cli.HelpFlag = cli.BoolFlag{
+		Name:  "help, h",
+		Usage: "Show help.",
+	}
 	app := cli.NewApp()
 	app.Name = "Minio"
 	app.Author = "Minio.io"
@@ -111,6 +115,8 @@ func registerApp() *cli.App {
 	app.Usage = "Cloud Storage Server."
 	app.Description = `Minio is an Amazon S3 compatible object storage server. Use it to store photos, videos, VMs, containers, log files, or any blob of data as objects.`
 	app.Flags = globalFlags
+	app.HideVersion = true     // Hide `--version` flag, we already have `minio version`.
+	app.HideHelpCommand = true // Hide `help, h` command, we already have `minio --help`.
 	app.Commands = commands
 	app.CustomAppHelpTemplate = minioHelpTemplate
 	app.CommandNotFound = func(ctx *cli.Context, command string) {

cmd/server-main.go

@@ -79,7 +79,6 @@ EXAMPLES:
       $ export MINIO_SECRET_KEY=miniostorage
       $ {{.HelpName}} http://192.168.1.11/mnt/export/ http://192.168.1.12/mnt/export/ \
           http://192.168.1.13/mnt/export/ http://192.168.1.14/mnt/export/
-
 `,
 }
 

cmd/update-main.go

@@ -46,7 +46,7 @@ var updateCmd = cli.Command{
    {{.HelpName}} - {{.Usage}}
 
 USAGE:
-   {{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}}
+   {{.HelpName}}{{if .VisibleFlags}} [FLAGS]{{end}}
 {{if .VisibleFlags}}
 FLAGS:
   {{range .VisibleFlags}}{{.}}
@@ -56,8 +56,10 @@ EXIT STATUS:
    1 - New update is available.
   -1 - Error in getting update information.
 
-VERSION:
+EXAMPLES:
-  ` + Version + `{{"\n"}}`,
+   1. Check if there is a new update available:
+       $ {{.HelpName}}
+`,
 }
 
 const releaseTagTimeLayout = "2006-01-02T15-04-05Z"

cmd/version-main.go

@@ -29,10 +29,15 @@ var versionCmd = cli.Command{
    {{.HelpName}} - {{.Usage}}
 
 USAGE:
-   {{.HelpName}}
+   {{.HelpName}}{{if .VisibleFlags}} [FLAGS]{{end}}
-
+{{if .VisibleFlags}}
-VERSION:
+FLAGS:
-  ` + Version + `{{"\n"}}`,
+  {{range .VisibleFlags}}{{.}}
+  {{end}}{{end}}
+EXAMPLES:
+   1. Prints server version:
+       $ {{.HelpName}}
+`,
 }
 
 func mainVersion(ctx *cli.Context) {

vendor/github.com/minio/cli/app.go

@@ -45,8 +45,10 @@ type App struct {
 	Flags []Flag
 	// Boolean to enable bash completion commands
 	EnableBashCompletion bool
-	// Boolean to hide built-in help command
+	// Boolean to hide built-in help flag
 	HideHelp bool
+	// Boolean to hide built-in help command
+	HideHelpCommand bool
 	// Boolean to hide built-in version flag and the VERSION section of help
 	HideVersion bool
 	// Populate on app startup, only gettable through method Categories()
@@ -144,9 +146,11 @@ func (a *App) Setup() {
 	}
 	a.Commands = newCmds
 
-	if a.Command(helpCommand.Name) == nil && !a.HideHelp {
+	if a.Command(helpCommand.Name) == nil {
-		a.Commands = append(a.Commands, helpCommand)
+		if !a.HideHelpCommand {
-		if (HelpFlag != BoolFlag{}) {
+			a.Commands = append(a.Commands, helpCommand)
+		}
+		if !a.HideHelp && (HelpFlag != BoolFlag{}) {
 			a.appendFlag(HelpFlag)
 		}
 	}
@@ -285,9 +289,11 @@ func (a *App) RunAndExitOnError() {
 func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	// append help to commands
 	if len(a.Commands) > 0 {
-		if a.Command(helpCommand.Name) == nil && !a.HideHelp {
+		if a.Command(helpCommand.Name) == nil {
-			a.Commands = append(a.Commands, helpCommand)
+			if !a.HideHelpCommand {
-			if (HelpFlag != BoolFlag{}) {
+				a.Commands = append(a.Commands, helpCommand)
+			}
+			if !a.HideHelp && (HelpFlag != BoolFlag{}) {
 				a.appendFlag(HelpFlag)
 			}
 		}

vendor/github.com/minio/cli/command.go

@@ -51,8 +51,10 @@ type Command struct {
 	// removed n version 2 since it only works under specific conditions so we
 	// backport here by exposing it as an option for compatibility.
 	SkipArgReorder bool
-	// Boolean to hide built-in help command
+	// Boolean to hide built-in help flag
 	HideHelp bool
+	// Boolean to hide built-in help command
+	HideHelpCommand bool
 	// Boolean to hide this command from help or completion
 	Hidden bool
 
@@ -261,6 +263,7 @@ func (c Command) startApp(ctx *Context) error {
 	app.Commands = c.Subcommands
 	app.Flags = c.Flags
 	app.HideHelp = c.HideHelp
+	app.HideHelpCommand = c.HideHelpCommand
 
 	app.Version = ctx.App.Version
 	app.HideVersion = ctx.App.HideVersion
@@ -301,5 +304,13 @@ func (c Command) startApp(ctx *Context) error {
 
 // VisibleFlags returns a slice of the Flags with Hidden=false
 func (c Command) VisibleFlags() []Flag {
-	return visibleFlags(c.Flags)
+	flags := c.Flags
+	if !c.HideHelp && (HelpFlag != BoolFlag{}) {
+		// append help to flags
+		flags = append(
+			flags,
+			HelpFlag,
+		)
+	}
+	return visibleFlags(flags)
 }

vendor/vendor.json

@@ -163,10 +163,10 @@
 			"revisionTime": "2016-07-23T06:10:19Z"
 		},
 		{
-			"checksumSHA1": "iDDGi0/U33hxoaQBgM3ww882lmU=",
+			"checksumSHA1": "7PcmjItrQSx/1sZ6Q395LCzT+iw=",
 			"path": "github.com/minio/cli",
-			"revision": "cea7bbb0e52ac4d24c1de3f450545f38246075a2",
+			"revision": "06bb2061ef1493532baf0444818eb5fb4c83caac",
-			"revisionTime": "2017-02-15T09:44:04Z"
+			"revisionTime": "2017-02-20T03:57:28Z"
 		},
 		{
 			"checksumSHA1": "NBGyq2+iTtJvJ+ElG4FzHLe1WSY=",