add support to get list of iac types with default versions

pkg/iac-providers/providers.go

@@ -19,6 +19,8 @@ package iacprovider
 import (
 	"fmt"
 	"reflect"
+	"sort"
+	"strings"
 
 	"go.uber.org/zap"
 )
@@ -54,8 +56,24 @@ func IsIacSupported(iacType, iacVersion string) bool {
 // SupportedIacProviders returns list of Iac Providers supported in terrascan
 func SupportedIacProviders() []string {
 	var iacTypes []string
-	for k, _ := range supportedIacProviders {
+	for k := range supportedIacProviders {
 		iacTypes = append(iacTypes, string(k))
 	}
+	sort.Strings(iacTypes)
 	return iacTypes
 }
+
+// SupportedIacVersions retuns a string of Iac providers and corresponding supported versions
+func SupportedIacVersions() []string {
+	var iacVersions []string
+	for iac, versions := range supportedIacProviders {
+		var versionSlice []string
+		for k := range versions {
+			versionSlice = append(versionSlice, string(k))
+		}
+		versionString := strings.Join(versionSlice, ", ")
+		iacVersions = append(iacVersions, fmt.Sprintf("%s: %s", string(iac), versionString))
+	}
+	sort.Strings(iacVersions)
+	return iacVersions
+}

pkg/iac-providers/providers_test.go

@@ -111,3 +111,16 @@ func TestIsIacSupported(t *testing.T) {
 		})
 	}
 }
+
+func TestSupportedIacProviders(t *testing.T) {
+	t.Run("supported iac providers", func(t *testing.T) {
+		var want []string
+		for k := range supportedIacProviders {
+			want = append(want, string(k))
+		}
+		got := SupportedIacProviders()
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("got: '%v', want: '%v'", got, want)
+		}
+	})
+}