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|
package vtclean
import (
"bufio"
"bytes"
"io"
)
type reader struct {
io.Reader
scanner *bufio.Scanner
buf []byte
color bool
}
func NewReader(r io.Reader, color bool) io.Reader {
return &reader{Reader: r, color: color}
}
func (r *reader) scan() bool {
if r.scanner == nil {
r.scanner = bufio.NewScanner(r.Reader)
}
if len(r.buf) > 0 {
return true
}
if r.scanner.Scan() {
r.buf = []byte(Clean(r.scanner.Text(), r.color) + "\n")
return true
}
return false
}
func (r *reader) fill(p []byte) int {
n := len(r.buf)
copy(p, r.buf)
if len(p) < len(r.buf) {
r.buf = r.buf[len(p):]
n = len(p)
} else {
r.buf = nil
}
return n
}
func (r *reader) Read(p []byte) (int, error) {
n := r.fill(p)
if n < len(p) {
if !r.scan() {
if n == 0 {
return 0, io.EOF
}
return n, nil
}
n += r.fill(p[n:])
}
return n, nil
}
type writer struct {
io.Writer
buf []byte
color bool
}
func NewWriter(w io.Writer, color bool) io.WriteCloser {
return &writer{Writer: w, color: color}
}
func (w *writer) Write(p []byte) (int, error) {
buf := append(w.buf, p...)
lines := bytes.Split(buf, []byte("\n"))
if len(lines) > 0 {
last := len(lines) - 1
w.buf = lines[last]
count := 0
for _, line := range lines[:last] {
n, err := w.Writer.Write([]byte(Clean(string(line), w.color) + "\n"))
count += n
if err != nil {
return count, err
}
}
}
return len(p), nil
}
func (w *writer) Close() error {
cl := Clean(string(w.buf), w.color)
_, err := w.Writer.Write([]byte(cl))
return err
}
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