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package datafs
import (
"bytes"
"context"
"io"
"io/fs"
"net/url"
"time"
"github.com/hairyhenderson/go-fsimpl"
)
// NewStdinFS returns a filesystem (an fs.FS) that can be used to read data from
// standard input (os.Stdin).
func NewStdinFS(_ *url.URL) (fs.FS, error) {
return &stdinFS{ctx: context.Background()}, nil
}
type stdinFS struct {
ctx context.Context
data []byte
}
//nolint:gochecknoglobals
var StdinFS = fsimpl.FSProviderFunc(NewStdinFS, "stdin")
var (
_ fs.FS = (*stdinFS)(nil)
_ fs.ReadFileFS = (*stdinFS)(nil)
_ withContexter = (*stdinFS)(nil)
)
func (f stdinFS) WithContext(ctx context.Context) fs.FS {
fsys := f
fsys.ctx = ctx
return &fsys
}
func (f *stdinFS) Open(name string) (fs.File, error) {
if !fs.ValidPath(name) {
return nil, &fs.PathError{
Op: "open",
Path: name,
Err: fs.ErrInvalid,
}
}
if err := f.readData(); err != nil {
return nil, &fs.PathError{
Op: "open",
Path: name,
Err: err,
}
}
return &stdinFile{name: name, body: bytes.NewReader(f.data)}, nil
}
func (f *stdinFS) ReadFile(name string) ([]byte, error) {
if !fs.ValidPath(name) {
return nil, &fs.PathError{
Op: "readFile",
Path: name,
Err: fs.ErrInvalid,
}
}
if err := f.readData(); err != nil {
return nil, &fs.PathError{
Op: "readFile",
Path: name,
Err: err,
}
}
return f.data, nil
}
func (f *stdinFS) readData() error {
if f.data != nil {
return nil
}
stdin := StdinFromContext(f.ctx)
b, err := io.ReadAll(stdin)
if err != nil {
return err
}
f.data = b
return nil
}
type stdinFile struct {
body io.Reader
name string
}
var _ fs.File = (*stdinFile)(nil)
func (f *stdinFile) Close() error {
if f.body == nil {
return &fs.PathError{Op: "close", Path: f.name, Err: fs.ErrClosed}
}
f.body = nil
return nil
}
func (f *stdinFile) stdinReader() (int, error) {
b, err := io.ReadAll(f.body)
if err != nil {
return 0, err
}
f.body = bytes.NewReader(b)
return len(b), err
}
func (f *stdinFile) Stat() (fs.FileInfo, error) {
n, err := f.stdinReader()
if err != nil {
return nil, err
}
return FileInfo(f.name, int64(n), 0o444, time.Time{}, ""), nil
}
func (f *stdinFile) Read(p []byte) (int, error) {
if f.body == nil {
return 0, io.EOF
}
return f.body.Read(p)
}
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