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flag_mutex.go

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package cli

// MutuallyExclusiveFlags defines a mutually exclusive flag group

// Multiple option paths can be provided out of which

// only one can be defined on cmdline

// So for example

// [ --foo | [ --bar something --darth somethingelse ] ]

type MutuallyExclusiveFlags struct {

// Flag list

Flags [][]Flag

// whether this group is required

Required bool

// Category to apply to all flags within group

Category string

}

func (grp MutuallyExclusiveFlags) check(_ *Command) error {

oneSet := false

e := &mutuallyExclusiveGroup{}

for _, grpf := range grp.Flags {

for _, f := range grpf {

if f.IsSet() {

if oneSet {

e.flag2Name = f.Names()[0]

return e

}

e.flag1Name = f.Names()[0]

oneSet = true

break

}

if oneSet {

break

}

}

}

if !oneSet && grp.Required {

return &mutuallyExclusiveGroupRequiredFlag{flags: &grp}

}

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)

}

}

}

}