initrd/shio/shio.go

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// Shared IO
package shio
import (
"io"
"sync"
"novit.nc/direktil/initrd/colorio"
)
type ShIO struct {
buf []byte
closed bool
cond *sync.Cond
hideInput bool
}
func New() *ShIO {
return NewWithCap(1024)
}
func NewWithCap(capacity int) *ShIO {
return NewWithBytes(make([]byte, 0, capacity))
}
func NewWithBytes(content []byte) *ShIO {
return &ShIO{
buf: content,
cond: sync.NewCond(&sync.Mutex{}),
}
}
var (
_ io.WriteCloser = New()
)
func (s *ShIO) Write(data []byte) (n int, err error) {
s.cond.L.Lock()
defer s.cond.L.Unlock()
if s.closed {
err = io.EOF
return
}
if s.hideInput {
s.buf = append(s.buf, colorio.Reset...)
}
s.buf = append(s.buf, data...)
n = len(data)
if s.hideInput {
s.buf = append(s.buf, colorio.Hidden...)
}
s.cond.Broadcast()
return
}
func (s *ShIO) HideInput() {
s.cond.L.Lock()
defer s.cond.L.Unlock()
if s.closed {
return
}
s.buf = append(s.buf, colorio.Hidden...)
s.hideInput = true
}
func (s *ShIO) ShowInput() {
s.cond.L.Lock()
defer s.cond.L.Unlock()
if s.closed {
return
}
s.buf = append(s.buf, colorio.Reset...)
s.hideInput = false
}
func (s *ShIO) Close() (err error) {
s.cond.L.Lock()
defer s.cond.L.Unlock()
s.closed = true
s.cond.Broadcast()
return
}
func (s *ShIO) NewReader() io.Reader {
return &shioReader{s, 0}
}
type shioReader struct {
in *ShIO
pos int
}
func (r *shioReader) Read(ba []byte) (n int, err error) {
r.in.cond.L.Lock()
defer r.in.cond.L.Unlock()
for r.pos == len(r.in.buf) && !r.in.closed {
r.in.cond.Wait()
}
if r.pos == len(r.in.buf) && r.in.closed {
err = io.EOF
return
}
n = copy(ba, r.in.buf[r.pos:])
r.pos += n
return
}