func (rf readerFrom) ReadFrom(r io.Reader) (int64, error) {
cr := newCountingRuneReader(r)
err := rf.ed.do(func() (addr, error) {
at, err := rf.a.where(rf.ed)
if err != nil {
return addr{}, err
}
return at, pend(rf.ed, at, runes.RunesReader(cr))
})
return cr.n, err
}
func (e pipe) do(ed *Editor, w io.Writer) (addr, error) {
at, err := e.a.where(ed)
if err != nil {
return addr{}, err
}
cmd := exec.Command(shell(), "-c", e.cmd)
cmd.Stderr = w
if e.to {
r := ed.buf.runes.Reader(at.from)
r = runes.LimitReader(r, at.size())
cmd.Stdin = runes.UTF8Reader(r)
}
if !e.from {
cmd.Stdout = w
if err := cmd.Run(); err != nil {
return addr{}, err
}
return at, nil
}
r, err := cmd.StdoutPipe()
if err != nil {
return addr{}, err
}
if err := cmd.Start(); err != nil {
return addr{}, err
}
pendErr := pend(ed, at, runes.RunesReader(bufio.NewReader(r)))
if err = cmd.Wait(); err != nil {
return addr{}, err
}
if pendErr != nil {
return addr{}, pendErr
}
return at, nil
}