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