From 58bfabca6d42352c357788aa392ccd2c04f673e8 Mon Sep 17 00:00:00 2001
From: Tim Jarratt <tjarratt@gmail.com>
Date: Tue, 4 Feb 2014 08:40:06 -0800
Subject: [PATCH] Add a way to override the app help printer

Fixes #64
---
 app_test.go | 19 +++++++++++++++++++
 help.go     |  3 ++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/app_test.go b/app_test.go
index 50f263383c..f329b91361 100644
--- a/app_test.go
+++ b/app_test.go
@@ -225,3 +225,22 @@ func TestApp_BeforeFunc(t *testing.T) {
 	}
 
 }
+
+func TestAppHelpPrinter(t *testing.T) {
+	oldPrinter := cli.HelpPrinter
+	defer func() {
+		cli.HelpPrinter = oldPrinter
+	}()
+
+	var wasCalled = false
+	cli.HelpPrinter = func(template string, data interface{}) {
+		wasCalled = true
+	}
+
+	app := cli.NewApp()
+	app.Run([]string{"-h"})
+
+	if wasCalled == false {
+		t.Errorf("Help printer expected to be called, but was not")
+	}
+}
diff --git a/help.go b/help.go
index 41b58afbb6..094d01d7f4 100644
--- a/help.go
+++ b/help.go
@@ -59,8 +59,9 @@ var helpCommand = Command{
 }
 
 // Prints help for the App
+var HelpPrinter = printHelp
 func ShowAppHelp(c *Context) {
-	printHelp(AppHelpTemplate, c.App)
+	HelpPrinter(AppHelpTemplate, c.App)
 }
 
 // Prints help for the given command