From 32ca64c50a0080198a924c4d9f7c18637b4a76f4 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Thu, 4 May 2017 17:24:36 +0200
Subject: [PATCH] feat templater: Warn if no valid resource sets are included

After filtering resource sets, check whether any resource sets "survived".

Otherwise it can be assumed that the user specified invalid exclude/include
combinations and should be warned about that.

Fixes #35
---
 templater/templater.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/templater/templater.go b/templater/templater.go
index 67e33a535..9a00da3a7 100644
--- a/templater/templater.go
+++ b/templater/templater.go
@@ -33,6 +33,11 @@ type TemplatingError struct {
 func LoadAndPrepareTemplates(include *[]string, exclude *[]string, c *context.Context) (output []string, err error) {
 	limitedResourceSets := applyLimits(&c.ResourceSets, include, exclude)
 
+	if len(*limitedResourceSets) == 0 {
+		fmt.Fprintln(os.Stderr, "No valid resource sets included!")
+		return
+	}
+
 	for _, rs := range *limitedResourceSets {
 		err = processResourceSet(c, &rs, &output)