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Move cursor to the beginning of the line before erasing #126

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merged 1 commit into from Dec 17, 2021
Merged

Move cursor to the beginning of the line before erasing #126

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11 changes: 9 additions & 2 deletions spinner.go
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Expand Up @@ -395,7 +395,7 @@ func (s *Spinner) UpdateCharSet(cs []string) {
s.mu.Unlock()
}

// erase deletes written characters.
// erase deletes written characters on the current line.
// Caller must already hold s.lock.
func (s *Spinner) erase() {
n := utf8.RuneCountInString(s.lastOutput)
Expand All @@ -405,7 +405,14 @@ func (s *Spinner) erase() {
s.lastOutput = ""
return
}
fmt.Fprintf(s.Writer, "\033[K") // erases to end of line

// Taken from https://en.wikipedia.org/wiki/ANSI_escape_code:
// \r - Carriage return - Moves the cursor to column zero
// \033[K - Erases part of the line. If n is 0 (or missing), clear from
// cursor to the end of the line. If n is 1, clear from cursor to beginning
// of the line. If n is 2, clear entire line. Cursor position does not
// change.
fmt.Fprintf(s.Writer, "\r\033[K")
s.lastOutput = ""
}

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