feat(command): show global options in command help

command.go

@@ -868,6 +868,19 @@ func (cmd *Command) appendFlag(fl Flag) {
 	}
 }
 
+// VisiblePersistentFlags returns a slice of [PersistentFlag] with Persistent=true and Hidden=false.
+func (cmd *Command) VisiblePersistentFlags() []Flag {
+	var flags []Flag
+	for _, fl := range cmd.Root().Flags {
+		pfl, ok := fl.(PersistentFlag)
+		if !ok || !pfl.IsPersistent() {
+			continue
+		}
+		flags = append(flags, fl)
+	}
+	return visibleFlags(flags)
+}
+
 func (cmd *Command) appendCommand(aCmd *Command) {
 	if !hasCommand(cmd.Commands, aCmd) {
 		aCmd.parent = cmd

godoc-current.txt

@@ -45,7 +45,9 @@ DESCRIPTION:
 
 OPTIONS:{{template "visibleFlagCategoryTemplate" .}}{{else if .VisibleFlags}}
 
-OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}
+OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}{{if .VisiblePersistentFlags}}
+
+GLOBAL OPTIONS:{{template "visiblePersistentFlagTemplate" .}}{{end}}
 `
     CommandHelpTemplate is the text template for the command help topic. cli.go
     uses text/template to render templates. You can render custom help text by
@@ -516,6 +518,10 @@ func (cmd *Command) VisibleFlagCategories() []VisibleFlagCategory
 func (cmd *Command) VisibleFlags() []Flag
     VisibleFlags returns a slice of the Flags with Hidden=false
 
+func (cmd *Command) VisiblePersistentFlags() []Flag
+    VisiblePersistentFlags returns a slice of PersistentFlag with
+    Persistent=true and Hidden=false.
+
 type CommandCategories interface {
 	// AddCommand adds a command to a category, creating a new category if necessary.
 	AddCommand(category string, command *Command)

help.go

@@ -410,6 +410,10 @@
 		handleTemplateError(err)
 	}
 
+	if _, err := t.New("visiblePersistentFlagTemplate").Parse(visiblePersistentFlagTemplate); err != nil {
+		handleTemplateError(err)
+	}
+
 	if _, err := t.New("visibleGlobalFlagCategoryTemplate").Parse(strings.Replace(visibleFlagCategoryTemplate, "OPTIONS", "GLOBAL OPTIONS", -1)); err != nil {
 		handleTemplateError(err)
 	}

help_test.go

@@ -687,6 +687,51 @@ UsageText`,
 		"expected output to include usage text")
 }
 
+func TestShowSubcommandHelp_GlobalOptions(t *testing.T) {
+	cmd := &Command{
+		Flags: []Flag{
+			&StringFlag{
+				Name:       "foo",
+				Persistent: true,
+			},
+		},
+		Commands: []*Command{
+			{
+				Name: "frobbly",
+				Flags: []Flag{
+					&StringFlag{
+						Name: "bar",
+					},
+				},
+				Action: func(context.Context, *Command) error {
+					return nil
+				},
+			},
+		},
+	}
+
+	output := &bytes.Buffer{}
+	cmd.Writer = output
+
+	_ = cmd.Run(buildTestContext(t), []string{"foo", "frobbly", "--help"})
+
+	expected := `NAME:
+   foo frobbly
+
+USAGE:
+   foo frobbly [command [command options]] 
+
+OPTIONS:
+   --bar value  
+   --help, -h   show help
+
+GLOBAL OPTIONS:
+   --foo value  
+`
+
+	assert.Contains(t, output.String(), expected, "expected output to include global options")
+}
+
 func TestShowSubcommandHelp_SubcommandUsageText(t *testing.T) {
 	cmd := &Command{
 		Commands: []*Command{

template.go

@@ -28,6 +28,9 @@ var visibleFlagCategoryTemplate = `{{range .VisibleFlagCategories}}
 var visibleFlagTemplate = `{{range $i, $e := .VisibleFlags}}
    {{wrap $e.String 6}}{{end}}`
 
+var visiblePersistentFlagTemplate = `{{range $i, $e := .VisiblePersistentFlags}}
+   {{wrap $e.String 6}}{{end}}`
+
 var versionTemplate = `{{if .Version}}{{if not .HideVersion}}
 
 VERSION:
@@ -80,7 +83,9 @@ DESCRIPTION:
 
 OPTIONS:{{template "visibleFlagCategoryTemplate" .}}{{else if .VisibleFlags}}
 
-OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}
+OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}{{if .VisiblePersistentFlags}}
+
+GLOBAL OPTIONS:{{template "visiblePersistentFlagTemplate" .}}{{end}}
 `
 
 // SubcommandHelpTemplate is the text template for the subcommand help topic.

testdata/godoc-v3.x.txt

@@ -45,7 +45,9 @@ DESCRIPTION:
 
 OPTIONS:{{template "visibleFlagCategoryTemplate" .}}{{else if .VisibleFlags}}
 
-OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}
+OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}{{if .VisiblePersistentFlags}}
+
+GLOBAL OPTIONS:{{template "visiblePersistentFlagTemplate" .}}{{end}}
 `
     CommandHelpTemplate is the text template for the command help topic. cli.go
     uses text/template to render templates. You can render custom help text by
@@ -516,6 +518,10 @@ func (cmd *Command) VisibleFlagCategories() []VisibleFlagCategory
 func (cmd *Command) VisibleFlags() []Flag
     VisibleFlags returns a slice of the Flags with Hidden=false
 
+func (cmd *Command) VisiblePersistentFlags() []Flag
+    VisiblePersistentFlags returns a slice of PersistentFlag with
+    Persistent=true and Hidden=false.
+
 type CommandCategories interface {
 	// AddCommand adds a command to a category, creating a new category if necessary.
 	AddCommand(category string, command *Command)