package promptkit

import (
	"errors"
	"fmt"
)

// ErrNilBundle is returned by Build when given a nil PromptBundle.
//
// ErrNilBundle 在 Build 收到 nil PromptBundle 时返回.
var ErrNilBundle = errors.New("promptkit: nil PromptBundle")

// SectionRenderError wraps an error from a Section.Render call.
// Layer is "base" or "conditional"; Section is the offending section's Name().
//
// SectionRenderError 包装 Section.Render 调用的错误.
// Layer 是 "base" 或 "conditional"; Section 是出错段的 Name().
type SectionRenderError struct {
	Layer   string
	Section string
	Cause   error
}

func (e *SectionRenderError) Error() string {
	return fmt.Sprintf("promptkit: section %q in layer %q render failed: %v", e.Section, e.Layer, e.Cause)
}

func (e *SectionRenderError) Unwrap() error { return e.Cause }