Add in Category to Flag interface

app.go

@@ -51,6 +51,8 @@ type App struct {
 	HideVersion bool
 	// Populate on app startup, only gettable through method Categories()
 	categories CommandCategories
+	// Populate on app startup, only gettable through method Categories()
+	flagCategories FlagCategories
 	// An action to execute when the bash-completion flag is set
 	BashComplete BashCompleteFunc
 	// An action to execute before any subcommands are run, but after the context is ready
@@ -192,6 +194,11 @@ func (a *App) Run(arguments []string) (err error) {
 		return err
 	}
 
+	a.flagCategories = FlagCategories{}
+	for _, flag := range a.Flags {
+		a.flagCategories = a.flagCategories.AddFlag(flag.GetCategory(), flag)
+	}
+
 	set.SetOutput(ioutil.Discard)
 	err = set.Parse(arguments[1:])
 	nerr := normalizeFlags(a.Flags, set)
@@ -437,6 +444,11 @@ func (a *App) VisibleCommands() []Command {
 	return ret
 }
 
+// Categories returns a slice containing all the categories with the commands they contain
+func (a *App) FlagCategories() FlagCategories {
+	return a.flagCategories
+}
+
 // VisibleFlags returns a slice of the Flags with Hidden=false
 func (a *App) VisibleFlags() []Flag {
 	return visibleFlags(a.Flags)

app_test.go

@@ -1607,6 +1607,10 @@ func (c *customBoolFlag) GetHidden() bool {
 	return false
 }
 
+func (c *customBoolFlag) GetCategory() string {
+	return ""
+}
+
 func (c *customBoolFlag) Apply(set *flag.FlagSet) {
 	set.String(c.Nombre, c.Nombre, "")
 }

flag.go

@@ -73,6 +73,7 @@ type Flag interface {
 	// Apply Flag settings to the given flag set
 	Apply(*flag.FlagSet)
 	GetName() string
+	GetCategory() string
 	GetHidden() bool
 }
 

flag_generated.go

@@ -35,6 +35,11 @@ func (f BoolFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f BoolFlag) GetCategory() string {
+	return f.Category
+}
+
 // Bool looks up the value of a local BoolFlag, returns
 // false if not found
 func (c *Context) Bool(name string) bool {
@@ -89,6 +94,11 @@ func (f BoolTFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f BoolTFlag) GetCategory() string {
+	return f.Category
+}
+
 // BoolT looks up the value of a local BoolTFlag, returns
 // false if not found
 func (c *Context) BoolT(name string) bool {
@@ -144,6 +154,11 @@ func (f DurationFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f DurationFlag) GetCategory() string {
+	return f.Category
+}
+
 // Duration looks up the value of a local DurationFlag, returns
 // 0 if not found
 func (c *Context) Duration(name string) time.Duration {
@@ -199,6 +214,11 @@ func (f Float64Flag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f Float64Flag) GetCategory() string {
+	return f.Category
+}
+
 // Float64 looks up the value of a local Float64Flag, returns
 // 0 if not found
 func (c *Context) Float64(name string) float64 {
@@ -253,6 +273,11 @@ func (f GenericFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f GenericFlag) GetCategory() string {
+	return f.Category
+}
+
 // Generic looks up the value of a local GenericFlag, returns
 // nil if not found
 func (c *Context) Generic(name string) interface{} {
@@ -308,6 +333,11 @@ func (f Int64Flag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f Int64Flag) GetCategory() string {
+	return f.Category
+}
+
 // Int64 looks up the value of a local Int64Flag, returns
 // 0 if not found
 func (c *Context) Int64(name string) int64 {
@@ -363,6 +393,11 @@ func (f IntFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f IntFlag) GetCategory() string {
+	return f.Category
+}
+
 // Int looks up the value of a local IntFlag, returns
 // 0 if not found
 func (c *Context) Int(name string) int {
@@ -417,6 +452,11 @@ func (f IntSliceFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f IntSliceFlag) GetCategory() string {
+	return f.Category
+}
+
 // IntSlice looks up the value of a local IntSliceFlag, returns
 // nil if not found
 func (c *Context) IntSlice(name string) []int {
@@ -471,6 +511,11 @@ func (f Int64SliceFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f Int64SliceFlag) GetCategory() string {
+	return f.Category
+}
+
 // Int64Slice looks up the value of a local Int64SliceFlag, returns
 // nil if not found
 func (c *Context) Int64Slice(name string) []int64 {
@@ -526,6 +571,11 @@ func (f StringFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f StringFlag) GetCategory() string {
+	return f.Category
+}
+
 // String looks up the value of a local StringFlag, returns
 // "" if not found
 func (c *Context) String(name string) string {
@@ -580,6 +630,11 @@ func (f StringSliceFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f StringSliceFlag) GetCategory() string {
+	return f.Category
+}
+
 // StringSlice looks up the value of a local StringSliceFlag, returns
 // nil if not found
 func (c *Context) StringSlice(name string) []string {
@@ -635,6 +690,11 @@ func (f Uint64Flag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f Uint64Flag) GetCategory() string {
+	return f.Category
+}
+
 // Uint64 looks up the value of a local Uint64Flag, returns
 // 0 if not found
 func (c *Context) Uint64(name string) uint64 {
@@ -690,6 +750,11 @@ func (f UintFlag) GetHidden() bool {
 	return f.Hidden
 }
 
+// GetCategory lets us access the flag category
+func (f UintFlag) GetCategory() string {
+	return f.Category
+}
+
 // Uint looks up the value of a local UintFlag, returns
 // 0 if not found
 func (c *Context) Uint(name string) uint {

generate-flag-types

@@ -176,6 +176,11 @@ def _write_cli_flag_types(outfile, types):
                 return f.Hidden
             }}
 
+            // GetCategory lets us access the flag category
+            func (f {name}Flag) GetCategory() string {{
+                return f.Category
+            }}
+
             // {name} looks up the value of a local {name}Flag, returns
             // {context_default} if not found
             func (c *Context) {name}(name string) {context_type} {{