tractor.dev/toolkit-go@v0.0.0-20241010005851-214d91207d07/engine/fs/memfs/dir.go (about)

     1  // Copyright © 2014 Steve Francia <spf@spf13.com>.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package memfs
    15  
    16  import (
    17  	"io/fs"
    18  	"sort"
    19  )
    20  
    21  type Dir interface {
    22  	Len() int
    23  	Names() []string
    24  	Files() []*FileData
    25  	Add(*FileData)
    26  	Remove(*FileData)
    27  }
    28  
    29  type dirEntry struct {
    30  	name  string
    31  	isDir bool
    32  	typ   fs.FileMode
    33  	info  fs.FileInfo
    34  }
    35  
    36  func (e dirEntry) Name() string {
    37  	return e.name
    38  }
    39  
    40  func (e dirEntry) IsDir() bool {
    41  	return e.isDir
    42  }
    43  
    44  func (e dirEntry) Type() fs.FileMode {
    45  	return e.typ
    46  }
    47  
    48  func (e dirEntry) Info() (fs.FileInfo, error) {
    49  	return e.info, nil
    50  }
    51  
    52  func RemoveFromMemDir(dir *FileData, f *FileData) {
    53  	dir.memDir.Remove(f)
    54  }
    55  
    56  func AddToMemDir(dir *FileData, f *FileData) {
    57  	dir.memDir.Add(f)
    58  }
    59  
    60  func InitializeDir(d *FileData) {
    61  	if d.memDir == nil {
    62  		d.dir = true
    63  		d.memDir = &DirMap{}
    64  	}
    65  }
    66  
    67  type DirMap map[string]*FileData
    68  
    69  func (m DirMap) Len() int           { return len(m) }
    70  func (m DirMap) Add(f *FileData)    { m[f.name] = f }
    71  func (m DirMap) Remove(f *FileData) { delete(m, f.name) }
    72  func (m DirMap) Files() (files []*FileData) {
    73  	for _, f := range m {
    74  		files = append(files, f)
    75  	}
    76  	sort.Sort(filesSorter(files))
    77  	return files
    78  }
    79  
    80  // implement sort.Interface for []*FileData
    81  type filesSorter []*FileData
    82  
    83  func (s filesSorter) Len() int           { return len(s) }
    84  func (s filesSorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
    85  func (s filesSorter) Less(i, j int) bool { return s[i].name < s[j].name }
    86  
    87  func (m DirMap) Names() (names []string) {
    88  	for x := range m {
    89  		names = append(names, x)
    90  	}
    91  	return names
    92  }