hcl/printer: output an equal sign only if we had one originally

hcl/printer/nodes.go

@@ -178,9 +178,11 @@ func (p *printer) objectItem(o *ast.ObjectItem) []byte {
 		buf.WriteByte(blank)
 
 		// reach end of key
-		if i == len(o.Keys)-1 && len(o.Keys) == 1 {
-			buf.WriteString("=")
-			buf.WriteByte(blank)
+		if i == len(o.Keys)-1 {
+			if o.Assign.IsValid() && len(o.Keys) == 1 {
+				buf.WriteString("=")
+				buf.WriteByte(blank)
+			}
 		}
 	}
 

hcl/printer/testdata/comment.golden

@@ -23,7 +23,7 @@ numbers = [1, 2] // another line here
 variable = {
 	description = "bar" # another yooo
 
-	foo = {
+	foo {
 		# Nested standalone
 
 		bar = "fatih"
@@ -31,6 +31,6 @@ variable = {
 }
 
 // lead comment
-foo = {
+foo {
 	bar = "fatih" // line comment 2 
 } // line comment 3

hcl/printer/testdata/comment_aligned.golden

@@ -1,4 +1,4 @@
-aligned = {
+aligned {
 	# We have some aligned items below
 	foo     = "fatih"       # yoo1
 	default = "bar"         # yoo2

hcl/printer/testdata/comment_standalone.golden

@@ -1,6 +1,6 @@
 // A standalone comment 
 
-aligned = {
+aligned {
 	# Standalone 1
 
 	a       = "bar" # yoo1

hcl/printer/testdata/complexhcl.golden

@@ -26,10 +26,15 @@ resource aws_instance "web" {
 		"${aws_security_group.firewall.foo}",
 	]
 
-	network_interface = {
+	network_interface {
 		device_index = 0
 		description  = "Main network interface"
 	}
+
+	network_interface = {
+		device_index = 1
+		description  = "Another network interface"
+	}
 }
 
 resource "aws_instance" "db" {

hcl/printer/testdata/complexhcl.input

@@ -24,11 +24,16 @@ resource "aws_security_group" "firewall" {
             "foo",
             "${aws_security_group.firewall.foo}"
                   ]
-    
+
            network_interface {
                  device_index = 0
                     description = "Main network interface"
         }
+
+           network_interface = {
+                 device_index = 1
+                    description = "Another network interface"
+        }
     }
 
 resource "aws_instance" "db" {