From eb4ee13f73329b9165627aac4f4ed789c78a387a Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 22 Aug 2022 21:30:00 +0530
Subject: [PATCH] Drop another dependency

---
 go.mod                      | 1 -
 go.sum                      | 2 --
 tools/cli/infrastructure.go | 4 ++--
 tools/cmd/at/main.go        | 3 +--
 tools/tty/tty.go            | 6 ++++++
 5 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/go.mod b/go.mod
index 4532d18ff..a12ada7c8 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,6 @@ module kitty
 go 1.19
 
 require (
-	github.com/mattn/go-isatty v0.0.14
 	github.com/mattn/go-runewidth v0.0.13
 	github.com/seancfoley/ipaddress-go v1.2.1
 	github.com/spf13/cobra v1.5.0
diff --git a/go.sum b/go.sum
index fe10686b8..5eb1ff929 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,6 @@
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
-github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
-github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
 github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
diff --git a/tools/cli/infrastructure.go b/tools/cli/infrastructure.go
index 13102ed21..ec76d4bd5 100644
--- a/tools/cli/infrastructure.go
+++ b/tools/cli/infrastructure.go
@@ -10,13 +10,13 @@ import (
 	"strings"
 	"unicode"
 
-	"github.com/mattn/go-isatty"
 	"github.com/mattn/go-runewidth"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/sys/unix"
 
 	"kitty"
+	"kitty/tools/tty"
 	"kitty/tools/utils"
 )
 
@@ -488,7 +488,7 @@ func Init(root *cobra.Command) {
 	if kitty.VCSRevision != "" {
 		vs = vs + " (" + kitty.VCSRevision + ")"
 	}
-	stdout_is_terminal = isatty.IsTerminal(os.Stdout.Fd())
+	stdout_is_terminal = tty.IsTerminal(os.Stdout.Fd())
 	RootCmd = root
 	root.Version = vs
 	root.SetUsageFunc(func(cmd *cobra.Command) error { return show_usage(cmd, false) })
diff --git a/tools/cmd/at/main.go b/tools/cmd/at/main.go
index 66efc1db7..efb5c23f0 100644
--- a/tools/cmd/at/main.go
+++ b/tools/cmd/at/main.go
@@ -9,7 +9,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/mattn/go-isatty"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"golang.org/x/sys/unix"
@@ -254,7 +253,7 @@ func get_password(password string, password_file string, password_env string, us
 	}
 	if ans == "" && password_file != "" {
 		if password_file == "-" {
-			if isatty.IsTerminal(os.Stdin.Fd()) {
+			if tty.IsTerminal(os.Stdin.Fd()) {
 				q, err := term.ReadPassword(int(os.Stdin.Fd()))
 				if err != nil {
 					ans = string(q)
diff --git a/tools/tty/tty.go b/tools/tty/tty.go
index 959a01a04..4221c2112 100644
--- a/tools/tty/tty.go
+++ b/tools/tty/tty.go
@@ -19,6 +19,12 @@ const (
 	TCSAFLUSH = 2
 )
 
+func IsTerminal(fd uintptr) bool {
+	var t unix.Termios
+	err := Tcgetattr(int(fd), &t)
+	return err == nil
+}
+
 type Term struct {
 	name   string
 	fd     int