From 7c75d26427c1ad3fb0fad0a437ffffa178c69939 Mon Sep 17 00:00:00 2001
From: Paul Annesley <paul@annesley.cc>
Date: Wed, 25 Oct 2017 21:17:18 +1100
Subject: [PATCH] Template parameters can have blank Default.

---
 main.go      | 6 ++----
 main_test.go | 9 +++++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/main.go b/main.go
index 66a90ab..f2cee9c 100644
--- a/main.go
+++ b/main.go
@@ -30,9 +30,7 @@ type ParameterItem struct {
 }
 
 type ParsedParameterSpec struct {
-	Type        string `yaml:"Type"`
-	Description string `yaml:"Description"`
-	Default     string `yaml:"Default"`
+	Default *string `yaml:"Default",omitempty`
 }
 
 type ParsedTemplate struct {
@@ -109,7 +107,7 @@ func getJsonForInput(input *Input) ([]byte, error) {
 
 	specs := make(map[string]ParameterSpec)
 	for name, parsed := range t.Parameters {
-		specs[name] = ParameterSpec{Name: name, HasDefault: parsed.Default != ""}
+		specs[name] = ParameterSpec{Name: name, HasDefault: parsed.Default != nil}
 	}
 
 	if err := validateParameters(input.Parameters, specs); err != nil {
diff --git a/main_test.go b/main_test.go
index a2ec6b0..a856d5f 100644
--- a/main_test.go
+++ b/main_test.go
@@ -109,6 +109,15 @@ func TestDeployScenario(t *testing.T) {
 	}
 }
 
+func TestBlankDefault(t *testing.T) {
+	input := &Input{
+		TemplateBody:   []byte("Parameters:\n  Foo:\n    Default: \"\"\n"),
+		AcceptDefaults: true,
+	}
+	actual := mustGetParameterItems(t, input)
+	assert.Equal(t, 0, len(actual))
+}
+
 func mustGetParameterItems(t *testing.T, input *Input) []ParameterItem {
 	j, err := getJsonForInput(input)
 	require.NoError(t, err)