From 050e42e42435d221e7ece0eecfcf1990e8804ae1 Mon Sep 17 00:00:00 2001
From: Ryan Fowler <ryan.fowler19@gmail.com>
Date: Thu, 20 Mar 2025 07:21:55 -0700
Subject: [PATCH] Refine logic to check if file is a terminal

---
 go.mod                           |  1 -
 go.sum                           |  2 --
 internal/core/term_unix.go       | 10 ++++++++++
 internal/core/term_unix_bsd.go   |  7 +++++++
 internal/core/term_unix_other.go |  7 +++++++
 internal/core/term_windows.go    | 11 +++++++++++
 internal/core/vars.go            |  6 ++----
 7 files changed, 37 insertions(+), 7 deletions(-)
 create mode 100644 internal/core/term_unix.go
 create mode 100644 internal/core/term_unix_bsd.go
 create mode 100644 internal/core/term_unix_other.go
 create mode 100644 internal/core/term_windows.go

diff --git a/go.mod b/go.mod
index 0c3da0a..b1769a3 100644
--- a/go.mod
+++ b/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
 )
diff --git a/go.sum b/go.sum
index 113e948..cdba557 100644
--- a/go.sum
+++ b/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=
diff --git a/internal/core/term_unix.go b/internal/core/term_unix.go
new file mode 100644
index 0000000..60504dd
--- /dev/null
+++ b/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
+}
diff --git a/internal/core/term_unix_bsd.go b/internal/core/term_unix_bsd.go
new file mode 100644
index 0000000..3183163
--- /dev/null
+++ b/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
diff --git a/internal/core/term_unix_other.go b/internal/core/term_unix_other.go
new file mode 100644
index 0000000..62adc40
--- /dev/null
+++ b/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
diff --git a/internal/core/term_windows.go b/internal/core/term_windows.go
new file mode 100644
index 0000000..0193fe1
--- /dev/null
+++ b/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
+}
diff --git a/internal/core/vars.go b/internal/core/vars.go
index 700fd78..66e2188 100644
--- a/internal/core/vars.go
+++ b/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()