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b2208bb9c2
This now keeps the cursor at the first column of the first status line so that messages printed to stdout or stderr by some other part of the progarm will still be visible. The message will overwrite the status lines, but those are easily reprinted on the next status update.
40 lines
1.1 KiB
Go
40 lines
1.1 KiB
Go
// +build !windows
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package termstatus
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import (
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"io"
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"syscall"
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"unsafe"
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isatty "github.com/mattn/go-isatty"
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)
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// clearCurrentLine 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 clearCurrentLine(wr io.Writer, fd uintptr) func(io.Writer, uintptr) {
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return posixClearCurrentLine
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}
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// moveCursorUp moves the cursor to the line n lines above the current one.
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func moveCursorUp(wr io.Writer, fd uintptr) func(io.Writer, uintptr, int) {
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return posixMoveCursorUp
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}
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// canUpdateStatus returns true if status lines can be printed, the process
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// output is not redirected to a file or pipe.
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func canUpdateStatus(fd uintptr) bool {
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return isatty.IsTerminal(fd)
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}
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// getTermSize returns the dimensions of the given terminal.
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// the code is taken from "golang.org/x/crypto/ssh/terminal"
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func getTermSize(fd uintptr) (width, height int, err error) {
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var dimensions [4]uint16
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if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 {
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return -1, -1, err
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}
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return int(dimensions[1]), int(dimensions[0]), nil
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}
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