Refine logic to check if file is a terminal

go.mod

@@ -5,5 +5,4 @@ go 1.24.1
 require (
 	golang.org/x/image v0.25.0
 	golang.org/x/sys v0.31.0
-	golang.org/x/term v0.30.0
 )

go.sum

@@ -2,5 +2,3 @@ golang.org/x/image v0.25.0 h1:Y6uW6rH1y5y/LK1J8BPWZtr6yZ7hrsy6hFrXjgsc2fQ=
 golang.org/x/image v0.25.0/go.mod h1:tCAmOEGthTtkalusGp1g3xa2gke8J6c2N565dTyl9Rs=
 golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
 golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/term v0.30.0 h1:PQ39fJZ+mfadBm0y5WlL4vlM7Sx1Hgf13sMIY2+QS9Y=
-golang.org/x/term v0.30.0/go.mod h1:NYYFdzHoI5wRh/h5tDMdMqCqPJZEuNqVR5xJLd/n67g=

internal/core/term_unix.go

@@ -0,0 +1,10 @@
+//go:build unix
+
+package core
+
+import "golang.org/x/sys/unix"
+
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermios(fd, ioctlTermiosReq)
+	return err == nil
+}

internal/core/term_unix_bsd.go

@@ -0,0 +1,7 @@
+//go:build darwin || dragonfly || freebsd || netbsd || openbsd
+
+package core
+
+import "golang.org/x/sys/unix"
+
+const ioctlTermiosReq = unix.TIOCGETA

internal/core/term_unix_other.go

@@ -0,0 +1,7 @@
+//go:build aix || linux || solaris || zos
+
+package core
+
+import "golang.org/x/sys/unix"
+
+const ioctlTermiosReq = unix.TCGETS

internal/core/term_windows.go

@@ -0,0 +1,11 @@
+//go:build windows
+
+package core
+
+import "golang.org/x/sys/windows"
+
+func isTerminal(fd int) bool {
+	var st uint32
+	err := windows.GetConsoleMode(windows.Handle(fd), &st)
+	return err == nil
+}

internal/core/vars.go

@@ -4,8 +4,6 @@ import (
 	"encoding/json"
 	"os"
 	"runtime/debug"
-
-	"golang.org/x/term"
 )
 
 var (
@@ -20,8 +18,8 @@ var (
 
 func init() {
 	// Determine if stderr and stdout are TTYs.
-	IsStderrTerm = term.IsTerminal(int(os.Stderr.Fd()))
-	IsStdoutTerm = term.IsTerminal(int(os.Stdout.Fd()))
+	IsStderrTerm = isTerminal(int(os.Stderr.Fd()))
+	IsStdoutTerm = isTerminal(int(os.Stdout.Fd()))
 
 	// Set executable version and user-agent.
 	Version = getVersion()