fix timeout empty

Author: lantoli

internal/convert/testdata/clu2adv/tags_labels_timeouts.in.tf

@@ -68,6 +68,7 @@ resource "mongodbatlas_cluster" "all" {
     value = "label val 2"
   }
   timeouts {
+    # comments in timeouts are also copied
     create = "60m"
     update = "50m"
     delete = "30m"

internal/convert/testdata/clu2adv/tags_labels_timeouts.out.tf

@@ -37,7 +37,6 @@ resource "mongodbatlas_advanced_cluster" "basictimeouts" {
     }]
   }]
   timeouts = {
-
     create = "60m"
   }
 
@@ -69,7 +68,7 @@ resource "mongodbatlas_advanced_cluster" "all" {
     "Label 2" = "label val 2"
   }
   timeouts = {
-
+    # comments in timeouts are also copied
     create = "60m"
     update = "50m"
     delete = "30m"

internal/hcl/hcl.go

@@ -98,16 +98,25 @@ func TokensArraySingle(body *hclwrite.Body) hclwrite.Tokens {
 
 // TokensObject creates an object.
 func TokensObject(body *hclwrite.Body) hclwrite.Tokens {
+	tokens := RemoveLeadingNewline(body.BuildTokens(nil))
 	ret := hclwrite.Tokens{
 		{Type: hclsyntax.TokenOBrace, Bytes: []byte("{")},
 		{Type: hclsyntax.TokenNewline, Bytes: []byte("\n")},
 	}
-	ret = append(ret, body.BuildTokens(nil)...)
+	ret = append(ret, tokens...)
 	ret = append(ret,
 		&hclwrite.Token{Type: hclsyntax.TokenCBrace, Bytes: []byte("}")})
 	return ret
 }
 
+// RemoveLeadingNewline removes the first newline if it exists to make the output prettier.
+func RemoveLeadingNewline(tokens hclwrite.Tokens) hclwrite.Tokens {
+	if len(tokens) > 0 && tokens[0].Type == hclsyntax.TokenNewline {
+		return tokens[1:]
+	}
+	return tokens
+}
+
 // AppendComment adds a comment at the end of the body.
 func AppendComment(body *hclwrite.Body, comment string) {
 	tokens := hclwrite.Tokens{