Include mutually exclusive flags in help text

command.go

@@ -282,8 +282,13 @@
 	tracef("sorting command categories (cmd=%[1]q)", cmd.Name)
 	sort.Sort(cmd.categories.(*commandCategories))
 
+	tracef("setting category on mutually exclusive flags (cmd=%[1]q)", cmd.Name)
+	for _, grp := range cmd.MutuallyExclusiveFlags {
+		grp.propagateCategory()
+	}
+
 	tracef("setting flag categories (cmd=%[1]q)", cmd.Name)
-	cmd.flagCategories = newFlagCategoriesFromFlags(cmd.Flags)
+	cmd.flagCategories = newFlagCategoriesFromFlags(cmd.allFlags())
 
 	if cmd.Metadata == nil {
 		tracef("setting default Metadata (cmd=%[1]q)", cmd.Name)
@@ -324,8 +329,13 @@
 	tracef("sorting command categories (cmd=%[1]q)", cmd.Name)
 	sort.Sort(cmd.categories.(*commandCategories))
 
+	tracef("setting category on mutually exclusive flags (cmd=%[1]q)", cmd.Name)
+	for _, grp := range cmd.MutuallyExclusiveFlags {
+		grp.propagateCategory()
+	}
+
 	tracef("setting flag categories (cmd=%[1]q)", cmd.Name)
-	cmd.flagCategories = newFlagCategoriesFromFlags(cmd.Flags)
+	cmd.flagCategories = newFlagCategoriesFromFlags(cmd.allFlags())
 }
 
 func (cmd *Command) ensureHelp() {
@@ -848,14 +858,14 @@
 // VisibleFlagCategories returns a slice containing all the visible flag categories with the flags they contain
 func (cmd *Command) VisibleFlagCategories() []VisibleFlagCategory {
 	if cmd.flagCategories == nil {
-		cmd.flagCategories = newFlagCategoriesFromFlags(cmd.Flags)
+		cmd.flagCategories = newFlagCategoriesFromFlags(cmd.allFlags())
 	}
 	return cmd.flagCategories.VisibleCategories()
 }
 
 // VisibleFlags returns a slice of the Flags with Hidden=false
 func (cmd *Command) VisibleFlags() []Flag {
-	return visibleFlags(cmd.Flags)
+	return visibleFlags(cmd.allFlags())
 }
 
 func (cmd *Command) appendFlag(fl Flag) {

command_test.go

@@ -524,19 +524,33 @@ func TestCommand_VisibleFlagCategories(t *testing.T) {
 				Category: "cat1",
 			},
 		},
+		MutuallyExclusiveFlags: []MutuallyExclusiveFlags{{
+			Category: "cat2",
+			Flags: [][]Flag{
+				{
+					&StringFlag{
+						Name: "mutex",
+					},
+				},
+			},
+		}},
 	}
 
+	cmd.MutuallyExclusiveFlags[0].propagateCategory()
+
 	vfc := cmd.VisibleFlagCategories()
-	require.Len(t, vfc, 2)
+	require.Len(t, vfc, 3)
 
 	assert.Equal(t, vfc[0].Name(), "", "expected category name to be empty")
+	assert.Equal(t, vfc[0].Flags()[0].Names(), []string{"strd"})
 
 	assert.Equal(t, vfc[1].Name(), "cat1", "expected category name cat1")
+	require.Len(t, vfc[1].Flags(), 1, "expected flag category to have one flag")
+	assert.Equal(t, vfc[1].Flags()[0].Names(), []string{"intd", "altd1", "altd2"})
 
-	require.Len(t, vfc[1].Flags(), 1, "expected flag category to have just one flag")
-
-	fl := vfc[1].Flags()[0]
-	assert.Equal(t, fl.Names(), []string{"intd", "altd1", "altd2"})
+	assert.Equal(t, vfc[2].Name(), "cat2", "expected category name cat2")
+	require.Len(t, vfc[2].Flags(), 1, "expected flag category to have one flag")
+	assert.Equal(t, vfc[2].Flags()[0].Names(), []string{"mutex"})
 }
 
 func TestCommand_RunSubcommandWithDefault(t *testing.T) {

flag.go

@@ -162,6 +162,9 @@ type VisibleFlag interface {
 type CategorizableFlag interface {
 	// Returns the category of the flag
 	GetCategory() string
+
+	// Sets the category of the flag
+	SetCategory(string)
 }
 
 // PersistentFlag is an interface to enable detection of flags which are persistent

flag_impl.go

@@ -221,6 +221,10 @@ func (f *FlagBase[T, C, V]) GetCategory() string {
 	return f.Category
 }
 
+func (f *FlagBase[T, C, V]) SetCategory(c string) {
+	f.Category = c
+}
+
 // GetUsage returns the usage string for the flag
 func (f *FlagBase[T, C, V]) GetUsage() string {
 	return f.Usage

flag_mutex.go

@@ -11,6 +11,9 @@ type MutuallyExclusiveFlags struct {
 
 	// whether this group is required
 	Required bool
+
+	// Category to apply to all flags within group
+	Category string
 }
 
 func (grp MutuallyExclusiveFlags) check(cmd *Command) error {
@@ -41,3 +44,13 @@ func (grp MutuallyExclusiveFlags) check(cmd *Command) error {
 	}
 	return nil
 }
+
+func (grp MutuallyExclusiveFlags) propagateCategory() {
+	for _, grpf := range grp.Flags {
+		for _, f := range grpf {
+			if cf, ok := f.(CategorizableFlag); ok {
+				cf.SetCategory(grp.Category)
+			}
+		}
+	}
+}

godoc-current.txt

@@ -289,6 +289,9 @@ func (s *BoolWithInverseFlag) Value() bool
 type CategorizableFlag interface {
 	// Returns the category of the flag
 	GetCategory() string
+
+	// Sets the category of the flag
+	SetCategory(string)
 }
     CategorizableFlag is an interface that allows us to potentially use a flag
     in a categorized representation.
@@ -702,6 +705,8 @@ func (f *FlagBase[T, C, V]) Names() []string
 func (f *FlagBase[T, C, V]) RunAction(ctx context.Context, cmd *Command) error
     RunAction executes flag action if set
 
+func (f *FlagBase[T, C, V]) SetCategory(c string)
+
 func (f *FlagBase[T, C, V]) String() string
     String returns a readable representation of this value (for usage defaults)
 
@@ -821,6 +826,9 @@ type MutuallyExclusiveFlags struct {
 
 	// whether this group is required
 	Required bool
+
+	// Category to apply to all flags within group
+	Category string
 }
     MutuallyExclusiveFlags defines a mutually exclusive flag group Multiple
     option paths can be provided out of which only one can be defined on cmdline

help_test.go

@@ -1176,6 +1176,28 @@ func TestDefaultCompleteWithFlags(t *testing.T) {
 	}
 }
 
+func TestMutuallyExclusiveFlags(t *testing.T) {
+	writer := &bytes.Buffer{}
+	cmd := &Command{
+		Name:   "cmd",
+		Writer: writer,
+		MutuallyExclusiveFlags: []MutuallyExclusiveFlags{
+			{
+				Flags: [][]Flag{
+					{
+						&StringFlag{
+							Name: "s1",
+						},
+					},
+				}},
+		},
+	}
+
+	_ = ShowAppHelp(cmd)
+
+	assert.Contains(t, writer.String(), "--s1", "written help does not include mutex flag")
+}
+
 func TestWrap(t *testing.T) {
 	emptywrap := wrap("", 4, 16)
 	assert.Empty(t, emptywrap, "Wrapping empty line should return empty line")
@@ -1504,6 +1526,29 @@ func TestCategorizedHelp(t *testing.T) {
 				Category: "cat1",
 			},
 		},
+		MutuallyExclusiveFlags: []MutuallyExclusiveFlags{
+			{
+				Category: "cat1",
+				Flags: [][]Flag{
+					{
+						&StringFlag{
+							Name:     "m1",
+							Category: "overridden",
+						},
+					},
+				},
+			},
+			{
+				Flags: [][]Flag{
+					{
+						&StringFlag{
+							Name:     "m2",
+							Category: "ignored",
+						},
+					},
+				},
+			},
+		},
 	}
 
 	HelpPrinter = func(w io.Writer, templ string, data interface{}) {
@@ -1533,11 +1578,13 @@ COMMANDS:
 
 GLOBAL OPTIONS:
    --help, -h    show help (default: false)
+   --m2 value    
    --strd value  
 
    cat1
 
    --intd value, --altd1 value, --altd2 value  (default: 0)
+   --m1 value                                  
 
 `, output.String())
 }

testdata/godoc-v3.x.txt

@@ -289,6 +289,9 @@ func (s *BoolWithInverseFlag) Value() bool
 type CategorizableFlag interface {
 	// Returns the category of the flag
 	GetCategory() string
+
+	// Sets the category of the flag
+	SetCategory(string)
 }
     CategorizableFlag is an interface that allows us to potentially use a flag
     in a categorized representation.
@@ -702,6 +705,8 @@ func (f *FlagBase[T, C, V]) Names() []string
 func (f *FlagBase[T, C, V]) RunAction(ctx context.Context, cmd *Command) error
     RunAction executes flag action if set
 
+func (f *FlagBase[T, C, V]) SetCategory(c string)
+
 func (f *FlagBase[T, C, V]) String() string
     String returns a readable representation of this value (for usage defaults)
 
@@ -821,6 +826,9 @@ type MutuallyExclusiveFlags struct {
 
 	// whether this group is required
 	Required bool
+
+	// Category to apply to all flags within group
+	Category string
 }
     MutuallyExclusiveFlags defines a mutually exclusive flag group Multiple
     option paths can be provided out of which only one can be defined on cmdline