106 lines
3.0 KiB
Go
106 lines
3.0 KiB
Go
package cursor
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import (
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"os"
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"syscall"
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"unsafe"
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)
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// Up moves the cursor n lines up relative to the current position.
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func Up(n int) {
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move(0, -n)
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height += n
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}
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// Down moves the cursor n lines down relative to the current position.
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func Down(n int) {
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move(0, n)
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if height-n <= 0 {
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height = 0
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} else {
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height -= n
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}
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}
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// Right moves the cursor n characters to the right relative to the current position.
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func Right(n int) {
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move(n, 0)
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}
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// Left moves the cursor n characters to the left relative to the current position.
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func Left(n int) {
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move(-n, 0)
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}
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func move(x int, y int) {
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handle := syscall.Handle(os.Stdout.Fd())
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var csbi consoleScreenBufferInfo
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_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
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var cursor coord
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cursor.x = csbi.cursorPosition.x + short(x)
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cursor.y = csbi.cursorPosition.y + short(y)
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_, _, _ = procSetConsoleCursorPosition.Call(uintptr(handle), uintptr(*(*int32)(unsafe.Pointer(&cursor))))
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}
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// HorizontalAbsolute moves the cursor to n horizontally.
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// The position n is absolute to the start of the line.
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func HorizontalAbsolute(n int) {
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handle := syscall.Handle(os.Stdout.Fd())
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var csbi consoleScreenBufferInfo
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_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
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var cursor coord
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cursor.x = short(n)
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cursor.y = csbi.cursorPosition.y
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if csbi.size.x < cursor.x {
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cursor.x = csbi.size.x
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}
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_, _, _ = procSetConsoleCursorPosition.Call(uintptr(handle), uintptr(*(*int32)(unsafe.Pointer(&cursor))))
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}
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// Show the cursor if it was hidden previously.
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// Don't forget to show the cursor at least at the end of your application.
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// Otherwise the user might have a terminal with a permanently hidden cursor, until he reopens the terminal.
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func Show() {
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handle := syscall.Handle(os.Stdout.Fd())
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var cci consoleCursorInfo
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_, _, _ = procGetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
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cci.visible = 1
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_, _, _ = procSetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
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}
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// Hide the cursor.
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// Don't forget to show the cursor at least at the end of your application with Show.
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// Otherwise the user might have a terminal with a permanently hidden cursor, until he reopens the terminal.
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func Hide() {
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handle := syscall.Handle(os.Stdout.Fd())
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var cci consoleCursorInfo
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_, _, _ = procGetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
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cci.visible = 0
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_, _, _ = procSetConsoleCursorInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&cci)))
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}
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// ClearLine clears the current line and moves the cursor to it's start position.
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func ClearLine() {
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handle := syscall.Handle(os.Stdout.Fd())
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var csbi consoleScreenBufferInfo
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_, _, _ = procGetConsoleScreenBufferInfo.Call(uintptr(handle), uintptr(unsafe.Pointer(&csbi)))
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var w uint32
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var x short
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cursor := csbi.cursorPosition
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x = csbi.size.x
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_, _, _ = procFillConsoleOutputCharacter.Call(uintptr(handle), uintptr(' '), uintptr(x), uintptr(*(*int32)(unsafe.Pointer(&cursor))), uintptr(unsafe.Pointer(&w)))
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}
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