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buildfs.go
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buildfs.go
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package buildfs
import (
"embed"
"errors"
"io"
"io/fs"
"time"
)
type buildFS struct {
fsys embed.FS
build_time time.Time
}
func BuildInFS(fsys embed.FS, build_time time.Time) fs.FS {
return &buildFS{fsys: fsys, build_time: build_time}
}
func (bfs buildFS) Open(name string) (fs.File, error) {
f, err := bfs.fsys.Open(name)
if err != nil {
return nil, err
}
s, err := f.Stat()
if err != nil {
return nil, err
}
if !s.IsDir() {
return &buildFile{f: f, mod_time: bfs.build_time}, nil
}
return &buildDir{f: f, mod_time: bfs.build_time}, nil
}
func (bf buildFS) ReadDir(name string) ([]fs.DirEntry, error) {
f, err := bf.Open(name)
if err != nil {
return nil, err
}
defer f.Close()
dir, ok := f.(*buildDir)
if !ok {
return nil, &fs.PathError{Op: "read", Path: name, Err: errors.New("not a directory")}
}
return dir.ReadDir(-1)
}
func (bf buildFS) ReadFile(name string) ([]byte, error) {
f, err := bf.Open(name)
if err != nil {
return nil, err
}
defer f.Close()
return io.ReadAll(f)
}
type buildFileInfo struct {
fi fs.FileInfo
mt time.Time
}
func (bfi *buildFileInfo) Name() string {
return bfi.fi.Name()
}
func (bfi *buildFileInfo) Size() int64 {
return bfi.fi.Size()
}
func (bfi *buildFileInfo) Mode() fs.FileMode {
return bfi.fi.Mode()
}
func (bfi *buildFileInfo) ModTime() time.Time {
return bfi.mt
}
func (bfi *buildFileInfo) IsDir() bool {
return bfi.fi.IsDir()
}
func (bfi *buildFileInfo) Sys() any {
return bfi.fi.Sys()
}
type buildDirEntry buildFileInfo
func newBuildDirEntry(bfi *buildFileInfo) *buildDirEntry {
return (*buildDirEntry)(bfi)
}
func (bde *buildDirEntry) Name() string {
return (*buildFileInfo)(bde).Name()
}
func (bde *buildDirEntry) IsDir() bool {
return (*buildFileInfo)(bde).IsDir()
}
func (bde *buildDirEntry) Type() fs.FileMode {
return (*buildFileInfo)(bde).Mode()
}
func (bde *buildDirEntry) Info() (fs.FileInfo, error) {
return (*buildFileInfo)(bde), nil
}
type buildFile struct {
f fs.File
mod_time time.Time
}
func (bf *buildFile) Close() error {
return bf.f.Close()
}
func (bf *buildFile) Stat() (fs.FileInfo, error) {
fi, err := bf.f.Stat()
if err != nil {
return nil, err
}
return &buildFileInfo{fi: fi, mt: bf.mod_time}, nil
}
func (bf *buildFile) Read(b []byte) (int, error) {
return bf.f.Read(b)
}
func (bf *buildFile) Seek(offset int64, whence int) (int64, error) {
s, ok := bf.f.(io.Seeker)
if !ok {
panic("Not embed.FS .")
}
return s.Seek(offset, whence)
}
func (bf *buildFile) ReadAt(b []byte, offset int64) (int, error) {
ra, ok := bf.f.(io.ReaderAt)
if !ok {
panic("Not embed.FS .")
}
return ra.ReadAt(b, offset)
}
type buildDir struct {
f fs.File
mod_time time.Time
}
func (bd *buildDir) Close() error {
return bd.f.Close()
}
func (bd *buildDir) Stat() (fs.FileInfo, error) {
fi, err := bd.f.Stat()
if err != nil {
return nil, err
}
return &buildFileInfo{fi: fi, mt: bd.mod_time}, nil
}
func (bd *buildDir) Read(b []byte) (int, error) {
return bd.f.Read(b)
}
func (bd *buildDir) ReadDir(count int) ([]fs.DirEntry, error) {
rd, ok := bd.f.(fs.ReadDirFile)
if !ok {
panic("Not embed.FS .")
}
ents, err := rd.ReadDir(count)
if err != nil {
return nil, err
}
new_ents := make([]fs.DirEntry, len(ents))
for i, ent := range ents {
fi, ierr := ent.Info()
if ierr != nil {
return nil, ierr
}
new_ents[i] = newBuildDirEntry(&buildFileInfo{fi: fi, mt: bd.mod_time})
}
return new_ents, nil
}