tea/vendor/github.com/muesli/reflow/ansi/writer.go

66 lines
1.2 KiB
Go

package ansi
import (
"io"
"strings"
)
type Writer struct {
Forward io.Writer
ansi bool
ansiseq string
lastseq string
seqchanged bool
}
// Write is used to write content to the ANSI buffer.
func (w *Writer) Write(b []byte) (int, error) {
for _, c := range string(b) {
if c == '\x1B' {
// ANSI escape sequence
w.ansi = true
w.seqchanged = true
w.ansiseq += string(c)
} else if w.ansi {
w.ansiseq += string(c)
if (c >= 0x41 && c <= 0x5a) || (c >= 0x61 && c <= 0x7a) {
// ANSI sequence terminated
w.ansi = false
_, _ = w.Forward.Write([]byte(w.ansiseq))
if strings.HasSuffix(w.ansiseq, "[0m") {
// reset sequence
w.lastseq = ""
} else if strings.HasSuffix(w.ansiseq, "m") {
// color code
w.lastseq = w.ansiseq
}
w.ansiseq = ""
}
} else {
_, err := w.Forward.Write([]byte(string(c)))
if err != nil {
return 0, err
}
}
}
return len(b), nil
}
func (w *Writer) LastSequence() string {
return w.lastseq
}
func (w *Writer) ResetAnsi() {
if !w.seqchanged {
return
}
_, _ = w.Forward.Write([]byte("\x1b[0m"))
}
func (w *Writer) RestoreAnsi() {
_, _ = w.Forward.Write([]byte(w.lastseq))
}