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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"
"os"
"sort"
"strings"
"sync"
"github.com/spf13/afero"
)
// Reseter is implemented by some of the stateful filesystems.
type Reseter interface {
Reset()
}
// DuplicatesReporter reports about duplicate filenames.
type DuplicatesReporter interface {
ReportDuplicates() string
}
var (
_ FilesystemUnwrapper = (*createCountingFs)(nil)
)
func NewCreateCountingFs(fs afero.Fs) afero.Fs {
return &createCountingFs{Fs: fs, fileCount: make(map[string]int)}
}
func (fs *createCountingFs) UnwrapFilesystem() afero.Fs {
return fs.Fs
}
// ReportDuplicates reports filenames written more than once.
func (c *createCountingFs) ReportDuplicates() string {
c.mu.Lock()
defer c.mu.Unlock()
var dupes []string
for k, v := range c.fileCount {
if v > 1 {
dupes = append(dupes, fmt.Sprintf("%s (%d)", k, v))
}
}
if len(dupes) == 0 {
return ""
}
sort.Strings(dupes)
return strings.Join(dupes, ", ")
}
// createCountingFs counts filenames of created files or files opened
// for writing.
type createCountingFs struct {
afero.Fs
mu sync.Mutex
fileCount map[string]int
}
func (c *createCountingFs) Reset() {
c.mu.Lock()
defer c.mu.Unlock()
c.fileCount = make(map[string]int)
}
func (fs *createCountingFs) onCreate(filename string) {
fs.mu.Lock()
defer fs.mu.Unlock()
fs.fileCount[filename] = fs.fileCount[filename] + 1
}
func (fs *createCountingFs) Create(name string) (afero.File, error) {
f, err := fs.Fs.Create(name)
if err == nil {
fs.onCreate(name)
}
return f, err
}
func (fs *createCountingFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
f, err := fs.Fs.OpenFile(name, flag, perm)
if err == nil && isWrite(flag) {
fs.onCreate(name)
}
return f, err
}
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