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37 lines
918 B
Go
37 lines
918 B
Go
package termstatus
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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)
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const (
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posixControlMoveCursorHome = "\r"
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posixControlMoveCursorUp = "\x1b[1A"
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posixControlClearLine = "\x1b[2K"
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)
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// posixClearCurrentLine removes all characters from the current line and resets the
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// cursor position to the first column.
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func posixClearCurrentLine(wr io.Writer, _ uintptr) {
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// clear current line
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_, err := wr.Write([]byte(posixControlMoveCursorHome + posixControlClearLine))
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if err != nil {
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fmt.Fprintf(os.Stderr, "write failed: %v\n", err)
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return
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}
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}
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// posixMoveCursorUp moves the cursor to the line n lines above the current one.
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func posixMoveCursorUp(wr io.Writer, _ uintptr, n int) {
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data := []byte(posixControlMoveCursorHome)
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data = append(data, bytes.Repeat([]byte(posixControlMoveCursorUp), n)...)
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_, err := wr.Write(data)
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if err != nil {
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fmt.Fprintf(os.Stderr, "write failed: %v\n", err)
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return
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}
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}
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