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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 hugofs
import (
"fmt"
"io/fs"
"os"
"path/filepath"
"github.com/spf13/afero"
)
var _ FilesystemUnwrapper = (*baseFileDecoratorFs)(nil)
func decorateDirs(fs afero.Fs, meta *FileMeta) afero.Fs {
ffs := &baseFileDecoratorFs{Fs: fs}
decorator := func(fi FileNameIsDir, name string) (FileNameIsDir, error) {
if !fi.IsDir() {
// Leave regular files as they are.
return fi, nil
}
return decorateFileInfo(fi, nil, "", meta), nil
}
ffs.decorate = decorator
return ffs
}
// NewBaseFileDecorator decorates the given Fs to provide the real filename
// and an Opener func.
func NewBaseFileDecorator(fs afero.Fs, callbacks ...func(fi FileMetaInfo)) afero.Fs {
ffs := &baseFileDecoratorFs{Fs: fs}
decorator := func(fi FileNameIsDir, filename string) (FileNameIsDir, error) {
// Store away the original in case it's a symlink.
meta := NewFileMeta()
meta.Name = fi.Name()
if fi.IsDir() {
meta.JoinStatFunc = func(name string) (FileMetaInfo, error) {
joinedFilename := filepath.Join(filename, name)
fi, err := fs.Stat(joinedFilename)
if err != nil {
return nil, err
}
fim, err := ffs.decorate(fi, joinedFilename)
if err != nil {
return nil, err
}
return fim.(FileMetaInfo), nil
}
}
opener := func() (afero.File, error) {
return ffs.open(filename)
}
fim := decorateFileInfo(fi, opener, filename, meta)
for _, cb := range callbacks {
cb(fim)
}
return fim, nil
}
ffs.decorate = decorator
return ffs
}
type baseFileDecoratorFs struct {
afero.Fs
decorate func(fi FileNameIsDir, name string) (FileNameIsDir, error)
}
func (fs *baseFileDecoratorFs) UnwrapFilesystem() afero.Fs {
return fs.Fs
}
func (fs *baseFileDecoratorFs) Stat(name string) (os.FileInfo, error) {
fi, err := fs.Fs.Stat(name)
if err != nil {
return nil, err
}
fim, err := fs.decorate(fi, name)
if err != nil {
return nil, err
}
return fim.(os.FileInfo), nil
}
func (fs *baseFileDecoratorFs) Open(name string) (afero.File, error) {
return fs.open(name)
}
func (fs *baseFileDecoratorFs) open(name string) (afero.File, error) {
f, err := fs.Fs.Open(name)
if err != nil {
return nil, err
}
return &baseFileDecoratorFile{File: f, fs: fs}, nil
}
type baseFileDecoratorFile struct {
afero.File
fs *baseFileDecoratorFs
}
func (l *baseFileDecoratorFile) ReadDir(n int) ([]fs.DirEntry, error) {
fis, err := l.File.(fs.ReadDirFile).ReadDir(-1)
if err != nil {
return nil, err
}
fisp := make([]fs.DirEntry, len(fis))
for i, fi := range fis {
filename := fi.Name()
if l.Name() != "" {
filename = filepath.Join(l.Name(), fi.Name())
}
fid, err := l.fs.decorate(fi, filename)
if err != nil {
return nil, fmt.Errorf("decorate: %w", err)
}
fisp[i] = fid.(fs.DirEntry)
}
return fisp, err
}
func (l *baseFileDecoratorFile) Readdir(c int) (ofi []os.FileInfo, err error) {
panic("not supported: Use ReadDir")
}
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