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argopt.go
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argopt.go
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package clitool
// ArgOpt is a functional option setting fields within Args once executed.
type ArgOpt func(args *Args)
func CreateArgs(opts ...ArgOpt) *Args {
a := &Args{}
Combine(opts...)(a)
return a
}
func Positional(values ...string) ArgOpt {
return func(a *Args) {
for _, value := range values {
if value != "" {
a.Add(value)
}
}
}
}
func Combine(opts ...ArgOpt) ArgOpt {
return func(a *Args) {
for _, opt := range opts {
if opts != nil {
opt(a)
}
}
}
}
func Extra(key, value string) ArgOpt {
return func(a *Args) { a.SetExtra(key, value) }
}
func ExtraIf(key, value string) ArgOpt {
return SetIf(Extra, key, value)
}
func Env(key, value string) ArgOpt {
return func(a *Args) { a.SetEnv(key, value) }
}
func EnvIf(key, value string) ArgOpt {
return SetIf(Env, key, value)
}
func Flag(key, value string) ArgOpt {
return func(a *Args) { a.SetFlag(key, value) }
}
func BoolFlag(key string, b bool) ArgOpt {
if !b {
return func(a *Args) {}
}
return Flag(key, "")
}
func FlagIf(key, value string) ArgOpt {
return SetIf(Flag, key, value)
}
func SetIf(fn func(k, v string) ArgOpt, key, value string) ArgOpt {
if value == "" {
return Noop()
}
return fn(key, value)
}
func Noop() ArgOpt {
return func(a *Args) {}
}
func When(b bool, opt ArgOpt) ArgOpt {
if b {
return opt
}
return Noop()
}