88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package hugofs
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import (
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"os"
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"path"
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"github.com/spf13/afero"
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)
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var (
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_ afero.Fs = (*languageCompositeFs)(nil)
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_ afero.Lstater = (*languageCompositeFs)(nil)
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)
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type languageCompositeFs struct {
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*afero.CopyOnWriteFs
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}
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// NewLanguageCompositeFs creates a composite and language aware filesystem.
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// This is a hybrid filesystem. To get a specific file in Open, Stat etc., use the full filename
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// to the target filesystem. This information is available in Readdir, Stat etc. via the
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// special LanguageFileInfo FileInfo implementation.
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func NewLanguageCompositeFs(base, overlay afero.Fs) afero.Fs {
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return &languageCompositeFs{afero.NewCopyOnWriteFs(base, overlay).(*afero.CopyOnWriteFs)}
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}
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// Open takes the full path to the file in the target filesystem. If it is a directory, it gets merged
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// using the language as a weight.
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func (fs *languageCompositeFs) Open(name string) (afero.File, error) {
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f, err := fs.CopyOnWriteFs.Open(name)
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if err != nil {
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return nil, err
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}
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fu, ok := f.(*afero.UnionFile)
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if ok {
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// This is a directory: Merge it.
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fu.Merger = LanguageDirsMerger
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}
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return f, nil
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}
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// LanguageDirsMerger implements the afero.DirsMerger interface, which is used
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// to merge two directories.
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var LanguageDirsMerger = func(lofi, bofi []os.FileInfo) ([]os.FileInfo, error) {
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m := make(map[string]FileMetaInfo)
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getKey := func(fim FileMetaInfo) string {
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return path.Join(fim.Meta().Lang, fim.Name())
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}
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for _, fi := range lofi {
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fim := fi.(FileMetaInfo)
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m[getKey(fim)] = fim
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}
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for _, fi := range bofi {
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fim := fi.(FileMetaInfo)
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key := getKey(fim)
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_, found := m[key]
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if !found {
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m[key] = fim
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}
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}
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merged := make([]os.FileInfo, len(m))
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i := 0
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for _, v := range m {
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merged[i] = v
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i++
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}
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return merged, nil
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}
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