35 lines
730 B
Go
35 lines
730 B
Go
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package generator
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import (
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"io"
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)
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// ErrorTracker tracks errors to the underlying writer, so that you can ignore
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// them until you're ready to return.
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type ErrorTracker struct {
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io.Writer
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err error
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}
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// NewErrorTracker makes a new error tracker; note that it implements io.Writer.
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func NewErrorTracker(w io.Writer) *ErrorTracker {
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return &ErrorTracker{Writer: w}
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}
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// Write intercepts calls to Write.
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func (et *ErrorTracker) Write(p []byte) (n int, err error) {
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if et.err != nil {
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return 0, et.err
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}
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n, err = et.Writer.Write(p)
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if err != nil {
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et.err = err
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}
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return n, err
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}
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// Error returns nil if no error has occurred, otherwise it returns the error.
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func (et *ErrorTracker) Error() error {
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return et.err
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}
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