Extract stringifying functions

src/org/org_types.nim

@@ -8,6 +8,7 @@ import std/[
 import fp/[
   maybe,
 ]
+import ../utils/printers
 
 ## Inline Block
 type
@@ -102,22 +103,15 @@ type
 const INDENT_SIZE = 2;
 
 func stringifySpecialFields(x: OrgBlock, indent = 0): string =
-  (
-    case x.kind:
-      of orgHeading:
-        @[
-          ("kind", $x.kind, true),
-          ("level", $x.level, true),
-          ("todo", $x.todo, x.todo.isSome()),
-          ("headlineContent", $x.headlineContent, x.headlineContent.len != 0),
-          ("headlineChildrenText", $x.headlineChildrenText, x.headlineChildrenText.len != 0),
-          ("children", $x.children, true),
-        ]
-      else: @[])
-  
-  .filter(x => x[2])
-  .map(x => x[0] & ": " & x[1])
-  .join(",\n")
+  @[
+    ("kind", $x.kind, true),
+    ("level", $x.level, true),
+    ("todo", $x.todo, x.todo.isSome()),
+    ("headlineContent", $x.headlineContent, x.headlineContent.len != 0),
+    ("headlineChildrenText", $x.headlineChildrenText, x.headlineChildrenText.len != 0),
+    ("children", $x.children, true),
+  ]
+  .stringifyFields()
 
 proc `$`*(x: OrgBlock, indent = 0): string =
   let fieldIndent = indent + INDENT_SIZE