90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
package commandkit
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
)
|
|
|
|
// ErrFlagInput identifies a missing required captured flag selected for an input.
|
|
var ErrFlagInput = errors.New("required flag input is missing")
|
|
|
|
// ErrFlagWiring identifies an invalid captured binding or destination.
|
|
var ErrFlagWiring = errors.New("flag wiring is invalid")
|
|
|
|
// FlagValues stores invocation-local values prepared for captured flags.
|
|
type FlagValues[I any] struct {
|
|
values map[*bindingIdentity]preparedValue[I]
|
|
}
|
|
|
|
// CaptureFlags adapts flags declared for I into flags on Outer. The returned
|
|
// flags preserve the original identities and store prepared values in target.
|
|
func CaptureFlags[Outer, I any](flags []Flag[I], target func(*Outer) *FlagValues[I]) []Flag[Outer] {
|
|
captured := make([]Flag[Outer], len(flags))
|
|
for index, original := range flags {
|
|
inner := original
|
|
identity := newBindingIdentity()
|
|
binding := flagBinding[Outer]{
|
|
identity: identity,
|
|
meta: inner.binding.meta,
|
|
defaultText: inner.binding.defaultText,
|
|
repeated: inner.binding.repeated,
|
|
boolean: inner.binding.boolean,
|
|
}
|
|
if target != nil && inner.binding.identity != nil && inner.binding.valid && inner.binding.prepare != nil {
|
|
binding.valid = true
|
|
binding.prepare = func(raw []string) (preparedValue[Outer], error) {
|
|
prepared, err := inner.binding.prepare(raw)
|
|
if err != nil {
|
|
return preparedValue[Outer]{}, err
|
|
}
|
|
return preparedValue[Outer]{
|
|
identity: identity,
|
|
supplied: prepared.supplied,
|
|
apply: func(outer *Outer) {
|
|
store := target(outer)
|
|
if store == nil {
|
|
return
|
|
}
|
|
if store.values == nil {
|
|
store.values = make(map[*bindingIdentity]preparedValue[I])
|
|
}
|
|
store.values[inner.binding.identity] = prepared
|
|
},
|
|
}, nil
|
|
}
|
|
}
|
|
captured[index] = Flag[Outer]{binding: binding}
|
|
}
|
|
return captured
|
|
}
|
|
|
|
// ApplyTo applies selected captured flags to an initialized destination.
|
|
// Repeated core-owned values are copied for each application.
|
|
func (values FlagValues[I]) ApplyTo(target *I, selected ...Flag[I]) error {
|
|
if target == nil {
|
|
return fmt.Errorf("%w: destination is nil", ErrFlagWiring)
|
|
}
|
|
for _, flag := range selected {
|
|
binding := flag.binding
|
|
if binding.identity == nil {
|
|
return fmt.Errorf("%w: selected flag has no identity", ErrFlagWiring)
|
|
}
|
|
prepared, exists := values.values[binding.identity]
|
|
if !exists {
|
|
return fmt.Errorf("%w: flag --%s was not captured", ErrFlagWiring, binding.meta.Name)
|
|
}
|
|
if binding.meta.Required && !prepared.supplied {
|
|
return fmt.Errorf("flag --%s: %w", binding.meta.Name, ErrFlagInput)
|
|
}
|
|
prepared.apply(target)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func classifyInputError(err error) Outcome {
|
|
if errors.Is(err, ErrFlagWiring) {
|
|
return Failure(err)
|
|
}
|
|
return Usage(err)
|
|
}
|