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34 lines
604 B
Go
34 lines
604 B
Go
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package ansi
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import (
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"bytes"
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"github.com/mattn/go-runewidth"
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)
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// Buffer is a buffer aware of ANSI escape sequences.
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type Buffer struct {
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bytes.Buffer
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}
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// PrintableRuneCount returns the amount of printable runes in the buffer.
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func (w Buffer) PrintableRuneCount() int {
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var n int
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var ansi bool
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for _, c := range w.String() {
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if c == '\x1B' {
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// ANSI escape sequence
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ansi = true
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} else if ansi {
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if (c >= 0x40 && c <= 0x5a) || (c >= 0x61 && c <= 0x7a) {
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// ANSI sequence terminated
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ansi = false
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}
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} else {
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n += runewidth.StringWidth(string(c))
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}
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}
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return n
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}
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