Mitchell-JohnsonandClaude Fable 5.1
436732dac0
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
38 lines
717 B
Go
38 lines
717 B
Go
package term
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// Ring is a fixed-size byte ring buffer holding the most recent output.
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type Ring struct {
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buf []byte
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start int
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n int
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}
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func NewRing(size int) *Ring { return &Ring{buf: make([]byte, size)} }
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func (r *Ring) Write(p []byte) {
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size := len(r.buf)
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if len(p) >= size {
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copy(r.buf, p[len(p)-size:])
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r.start, r.n = 0, size
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return
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}
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end := (r.start + r.n) % size
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first := copy(r.buf[end:], p)
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copy(r.buf, p[first:])
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if r.n+len(p) > size {
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r.start = (end + len(p)) % size
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r.n = size
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} else {
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r.n += len(p)
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}
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}
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func (r *Ring) Bytes() []byte {
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out := make([]byte, r.n)
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first := copy(out, r.buf[r.start:])
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if first < r.n {
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copy(out[first:], r.buf[:r.n-first])
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}
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return out
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}
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