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// Copyright 2021 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 glob
import (
"path"
"path/filepath"
"strings"
"github.com/gobwas/glob"
)
type FilenameFilter struct {
shouldInclude func(filename string) bool
inclusions []glob.Glob
dirInclusions []glob.Glob
exclusions []glob.Glob
isWindows bool
}
func normalizeFilenameGlobPattern(s string) string {
// Use Unix separators even on Windows.
s = filepath.ToSlash(s)
if !strings.HasPrefix(s, "/") {
s = "/" + s
}
return s
}
// NewFilenameFilter creates a new Glob where the Match method will
// return true if the file should be included.
// Note that the inclusions will be checked first.
func NewFilenameFilter(inclusions, exclusions []string) (*FilenameFilter, error) {
if inclusions == nil && exclusions == nil {
return nil, nil
}
filter := &FilenameFilter{isWindows: isWindows}
for _, include := range inclusions {
include = normalizeFilenameGlobPattern(include)
g, err := filenamesGlobCache.GetGlob(include)
if err != nil {
return nil, err
}
filter.inclusions = append(filter.inclusions, g)
// For mounts that do directory walking (e.g. content) we
// must make sure that all directories up to this inclusion also
// gets included.
dir := path.Dir(include)
parts := strings.Split(dir, "/")
for i, _ := range parts {
pattern := "/" + filepath.Join(parts[:i+1]...)
g, err := filenamesGlobCache.GetGlob(pattern)
if err != nil {
return nil, err
}
filter.dirInclusions = append(filter.dirInclusions, g)
}
}
for _, exclude := range exclusions {
exclude = normalizeFilenameGlobPattern(exclude)
g, err := filenamesGlobCache.GetGlob(exclude)
if err != nil {
return nil, err
}
filter.exclusions = append(filter.exclusions, g)
}
return filter, nil
}
// MustNewFilenameFilter invokes NewFilenameFilter and panics on error.
func MustNewFilenameFilter(inclusions, exclusions []string) *FilenameFilter {
filter, err := NewFilenameFilter(inclusions, exclusions)
if err != nil {
panic(err)
}
return filter
}
// NewFilenameFilterForInclusionFunc create a new filter using the provided inclusion func.
func NewFilenameFilterForInclusionFunc(shouldInclude func(filename string) bool) *FilenameFilter {
return &FilenameFilter{shouldInclude: shouldInclude, isWindows: isWindows}
}
// Match returns whether filename should be included.
func (f *FilenameFilter) Match(filename string, isDir bool) bool {
if f == nil {
return true
}
return f.doMatch(filename, isDir)
/*if f.shouldInclude == nil {
fmt.Printf("Match: %q (%t) => %t\n", filename, isDir, isMatch)
}
return isMatch*/
}
func (f *FilenameFilter) doMatch(filename string, isDir bool) bool {
if f == nil {
return true
}
if !strings.HasPrefix(filename, filepathSeparator) {
filename = filepathSeparator + filename
}
if f.shouldInclude != nil {
if f.shouldInclude(filename) {
return true
}
if f.isWindows {
// The Glob matchers below handles this by themselves,
// for the shouldInclude we need to take some extra steps
// to make this robust.
winFilename := filepath.FromSlash(filename)
if filename != winFilename {
if f.shouldInclude(winFilename) {
return true
}
}
}
}
for _, inclusion := range f.inclusions {
if inclusion.Match(filename) {
return true
}
}
if isDir && f.inclusions != nil {
for _, inclusion := range f.dirInclusions {
if inclusion.Match(filename) {
return true
}
}
}
for _, exclusion := range f.exclusions {
if exclusion.Match(filename) {
return false
}
}
return f.inclusions == nil && f.shouldInclude == nil
}
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