Add indent parameter to Serializer.serialize() (#2177)

Using Utils.indent() gives deprecation warnings to use Serializer instead. However,
the Serializer class itself doesn't provide a means to manually indent a FirrtlNode
string a certain number of times.

The indent variable, previously hardcoded to 0, is now exposed as a second parameter
for the modified serialize function, and the old serialize function just calls the
modified serialize with indents = 0 for binary compatibility

Co-authored-by: Megan Wachs <megan@sifive.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/main/scala/firrtl/ir/Serializer.scala b/src/main/scala/firrtl/ir/Serializer.scala
index dca902fe..1c2bfc82 100644
--- a/src/main/scala/firrtl/ir/Serializer.scala
+++ b/src/main/scala/firrtl/ir/Serializer.scala
@@ -10,10 +10,16 @@ object Serializer {
   val NewLine = '\n'
   val Indent = "  "
 
-  /** Converts a `FirrtlNode` into its string representation. */
+  /** Converts a `FirrtlNode` into its string representation with
+    * default indentation.
+    */
   def serialize(node: FirrtlNode): String = {
+    serialize(node, 0)
+  }
+
+  /** Converts a `FirrtlNode` into its string representation. */
+  def serialize(node: FirrtlNode, indent: Int): String = {
     val builder = new StringBuilder()
-    val indent = 0
     node match {
       case n: Info        => s(n)(builder, indent)
       case n: StringLit   => s(n)(builder, indent)