From a26de0ed4550c5cec208b544c9ef3b457d2c8556 Mon Sep 17 00:00:00 2001
From: Alex Goodman <wagoodman@gmail.com>
Date: Thu, 21 Nov 2019 20:45:35 -0800
Subject: [PATCH] gracefully exit when no tty is present; partially addresses
 #253

---
 runtime/ui/app.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/runtime/ui/app.go b/runtime/ui/app.go
index 0d77116..ec4c1d6 100644
--- a/runtime/ui/app.go
+++ b/runtime/ui/app.go
@@ -1,8 +1,11 @@
 package ui
 
 import (
+	"fmt"
 	"github.com/wagoodman/dive/dive/image"
 	"github.com/wagoodman/dive/runtime/ui/key"
+	"golang.org/x/crypto/ssh/terminal"
+	"os"
 	"sync"
 
 	"github.com/jroimartin/gocui"
@@ -121,6 +124,10 @@ func (a *app) quit() error {
 func Run(analysis *image.AnalysisResult, treeStack filetree.Comparer) error {
 	var err error
 
+	if !terminal.IsTerminal(int(os.Stdout.Fd())) {
+		return fmt.Errorf("no tty present, refusing show ui (if running in docker, use -it args)")
+	}
+
 	g, err := gocui.NewGui(gocui.OutputNormal)
 	if err != nil {
 		return err