mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-23 18:12:13 +00:00
81 lines
2.4 KiB
Go
81 lines
2.4 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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"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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_ FilesystemsUnwrapper = (*languageCompositeFs)(nil)
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)
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type languageCompositeFs struct {
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base afero.Fs
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overlay afero.Fs
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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{base, overlay, afero.NewCopyOnWriteFs(base, overlay).(*afero.CopyOnWriteFs)}
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}
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func (fs *languageCompositeFs) UnwrapFilesystems() []afero.Fs {
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return []afero.Fs{fs.base, fs.overlay}
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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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for _, fi1 := range bofi {
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fim1 := fi1.(FileMetaInfo)
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var found bool
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for _, fi2 := range lofi {
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fim2 := fi2.(FileMetaInfo)
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if fi1.Name() == fi2.Name() && fim1.Meta().Lang == fim2.Meta().Lang {
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found = true
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break
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}
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}
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if !found {
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lofi = append(lofi, fi1)
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}
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}
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return lofi, nil
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}
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