47 lines
856 B
Go
47 lines
856 B
Go
package common
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import (
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"bytes"
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"io"
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)
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// LineHandler is a callback function for handling a line
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type LineHandler func(line string)
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type lineWriter struct {
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buffer bytes.Buffer
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handlers []LineHandler
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}
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// NewLineWriter creates a new instance of a line writer
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func NewLineWriter(handlers ...LineHandler) io.Writer {
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w := new(lineWriter)
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w.handlers = handlers
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return w
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}
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func (lw *lineWriter) Write(p []byte) (n int, err error) {
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pBuf := bytes.NewBuffer(p)
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written := 0
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for {
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line, err := pBuf.ReadString('\n')
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w, _ := lw.buffer.WriteString(line)
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written += w
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if err == nil {
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lw.handleLine(lw.buffer.String())
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lw.buffer.Reset()
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} else if err == io.EOF {
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break
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} else {
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return written, err
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}
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}
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return written, nil
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}
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func (lw *lineWriter) handleLine(line string) {
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for _, h := range lw.handlers {
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h(line)
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}
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}
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