63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
package colog
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import (
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"syscall"
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"unsafe"
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)
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// Use variable indirection for test stubbing
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var isTerminal = isTerminalFunc
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var terminalWidth = terminalWidthFunc
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var kernel32 = syscall.NewLazyDLL("kernel32.dll")
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var procInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
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var procMode = kernel32.NewProc("GetConsoleMode")
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// Not applicable in windows
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// define constant to avoid compilation error
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const ioctlReadTermios = 0x0
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// isTerminalFunc returns true if the given file descriptor is a terminal.
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func isTerminalFunc(fd int) bool {
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var st uint32
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r, _, errno := syscall.Syscall(procMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
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if errno != 0 {
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return false
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}
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return r != 0
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}
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type short int16
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type word uint16
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type coord struct {
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x short
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y short
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}
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type rectangle struct {
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left short
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top short
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right short
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bottom short
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}
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type termInfo struct {
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size coord
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cursorPosition coord
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attributes word
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window rectangle
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maximumWindowSize coord
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}
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// terminalWidthFunc returns the width in characters of the terminal.
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func terminalWidthFunc(fd int) (width int) {
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var info termInfo
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_, _, errno := syscall.Syscall(procInfo.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&info)), 0)
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if errno != 0 {
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return -1
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}
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return int(info.size.x)
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}
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