config: change Default to an interface{}

config/config.go

@@ -53,9 +53,8 @@ type Provisioner struct {
 // Variable is a variable defined within the configuration.
 type Variable struct {
 	Name        string
-	Default     string
+	Default     interface{}
 	Description string
-	defaultSet  bool
 }
 
 // Output is an output defined within the configuration. An output is
@@ -310,9 +309,8 @@ func (v *Variable) Merge(v2 *Variable) *Variable {
 	// The names should be the same, but the second name always wins.
 	result.Name = v2.Name
 
-	if v2.defaultSet {
+	if v2.Default != nil {
 		result.Default = v2.Default
-		result.defaultSet = true
 	}
 	if v2.Description != "" {
 		result.Description = v2.Description
@@ -331,7 +329,7 @@ func (v *Variable) mergerMerge(m merger) merger {
 
 // Required tests whether a variable is required or not.
 func (v *Variable) Required() bool {
-	return !v.defaultSet
+	return v.Default == nil
 }
 
 func NewResourceVariable(key string) (*ResourceVariable, error) {

config/loader_libucl.go

@@ -30,7 +30,7 @@ func (t *libuclConfigurable) Config() (*Config, error) {
 	}
 
 	type LibuclVariable struct {
-		Default     string
+		Default     interface{}
 		Description string
 		Fields      []string `libucl:",decodedFields"`
 	}
@@ -51,19 +51,10 @@ func (t *libuclConfigurable) Config() (*Config, error) {
 	if len(rawConfig.Variable) > 0 {
 		config.Variables = make([]*Variable, 0, len(rawConfig.Variable))
 		for k, v := range rawConfig.Variable {
-			defaultSet := false
-			for _, f := range v.Fields {
-				if f == "Default" {
-					defaultSet = true
-					break
-				}
-			}
-
 			config.Variables = append(config.Variables, &Variable{
 				Name:        k,
 				Default:     v.Default,
 				Description: v.Description,
-				defaultSet:  defaultSet,
 			})
 		}
 	}

config/loader_test.go

@@ -437,20 +437,20 @@ func variablesStr(vs []*Variable) string {
 	for _, k := range ks {
 		v := m[k]
 
-		if v.Default == "" {
+		required := ""
+		if v.Required() {
+			required = " (required)"
+		}
+
+		if v.Default == nil || v.Default == "" {
 			v.Default = "<>"
 		}
 		if v.Description == "" {
 			v.Description = "<>"
 		}
 
-		required := ""
-		if v.Required() {
-			required = " (required)"
-		}
-
 		result += fmt.Sprintf(
-			"%s%s\n  %s\n  %s\n",
+			"%s%s\n  %v\n  %s\n",
 			k,
 			required,
 			v.Default,

config/merge_test.go

@@ -103,7 +103,7 @@ func TestMerge(t *testing.T) {
 					&Resource{Name: "bar"},
 				},
 				Variables: []*Variable{
-					&Variable{Name: "foo", Default: "bar", defaultSet: true},
+					&Variable{Name: "foo", Default: "bar"},
 					&Variable{Name: "bar"},
 				},
 
@@ -124,7 +124,7 @@ func TestMerge(t *testing.T) {
 					&Resource{Name: "bar"},
 				},
 				Variables: []*Variable{
-					&Variable{Name: "foo", Default: "bar", defaultSet: true},
+					&Variable{Name: "foo", Default: "bar"},
 					&Variable{Name: "foo"},
 					&Variable{Name: "bar"},
 				},