templating/loader/chain/loader.go

package chain

import (
	"context"
	"errors"
	"fmt"

	"gitoa.ru/go-4devs/templating/loader"
	"gitoa.ru/go-4devs/templating/render"
)

var _ loader.Loader = (Loaders)(nil)

type Loaders []loader.Loader

func (l Loaders) Load(ctx context.Context, template render.Reference) (loader.Source, error) {
	for idx, load := range l {
		sourse, err := load.Load(ctx, template)
		if err == nil {
			return sourse, nil
		}

		if !errors.Is(err, loader.ErrNotFound) {
			return loader.Source{}, fmt.Errorf("chain[%d]:%w", idx, err)
		}
	}

	return loader.Source{}, fmt.Errorf("chains(%d):%w", len(l), loader.ErrNotFound)
}