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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package page
import (
"fmt"
)
var (
_ pagesLanguageMerger = (*Pages)(nil)
)
type pagesLanguageMerger interface {
MergeByLanguage(other Pages) Pages
// Needed for integration with the tpl package.
MergeByLanguageInterface(other interface{}) (interface{}, error)
}
// MergeByLanguage supplies missing translations in p1 with values from p2.
// The result is sorted by the default sort order for pages.
func (p1 Pages) MergeByLanguage(p2 Pages) Pages {
merge := func(pages *Pages) {
m := make(map[string]bool)
for _, p := range *pages {
m[p.TranslationKey()] = true
}
for _, p := range p2 {
if _, found := m[p.TranslationKey()]; !found {
*pages = append(*pages, p)
}
}
SortByDefault(*pages)
}
out, _ := spc.getP("pages.MergeByLanguage", merge, p1, p2)
return out
}
// MergeByLanguageInterface is the generic version of MergeByLanguage. It
// is here just so it can be called from the tpl package.
func (p1 Pages) MergeByLanguageInterface(in interface{}) (interface{}, error) {
if in == nil {
return p1, nil
}
p2, ok := in.(Pages)
if !ok {
return nil, fmt.Errorf("%T cannot be merged by language", in)
}
return p1.MergeByLanguage(p2), nil
}
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