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package jsoncolor
import (
"io"
"os"
"golang.org/x/sys/windows"
)
// IsColorTerminal returns true if w is a colorable terminal.
// It respects [NO_COLOR], [FORCE_COLOR] and TERM=dumb environment variables.
//
// [NO_COLOR]: https://no-color.org/
// [FORCE_COLOR]: https://force-color.org/
func IsColorTerminal(w io.Writer) bool {
if os.Getenv("NO_COLOR") != "" {
return false
}
if os.Getenv("FORCE_COLOR") != "" {
return true
}
if os.Getenv("TERM") == "dumb" {
return false
}
if w == nil {
return false
}
f, ok := w.(*os.File)
if !ok {
return false
}
fd := f.Fd()
console := windows.Handle(fd)
var mode uint32
if err := windows.GetConsoleMode(console, &mode); err != nil {
return false
}
var want uint32 = windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING
if (mode & want) == want {
return true
}
mode |= want
if err := windows.SetConsoleMode(console, mode); err != nil {
return false
}
return true
}
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