From 6a9a35db61e1e47652fa667ff557555e87a6edeb Mon Sep 17 00:00:00 2001
From: Ganesh Viswanathan <dev@genotrance.com>
Date: Wed, 15 Apr 2020 23:42:22 -0500
Subject: ast2 varargs support

---
 nimterop/ast2.nim    | 11 +++++++++++
 nimterop/getters.nim | 14 ++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/nimterop/ast2.nim b/nimterop/ast2.nim
index 5bb33ae..554c507 100644
--- a/nimterop/ast2.nim
+++ b/nimterop/ast2.nim
@@ -686,6 +686,10 @@ proc newProcTy(nimState: NimState, name: string, node: TSNode, rtyp: PNode): PNo
   result.add nimState.newFormalParams(name, node, rtyp)
   result.add nimState.newPragma(node, nimState.gState.convention)
 
+  # Add varargs if ...
+  if node.getVarargs():
+    nimState.addPragma(node, result[^1], "varargs")
+
 proc processNode(nimState: NimState, node: TSNode): bool
 proc newRecListTree(nimState: NimState, name: string, node: TSNode): PNode =
   # Create nkRecList tree for specified object
@@ -1582,6 +1586,9 @@ proc addProc(nimState: NimState, node, rnode: TSNode) =
           # {.impnameC.} shortcut
           nimState.newPragma(node, nimState.impShort & "C")
 
+      # Detect ... and add {.varargs.}
+      pvarargs = plist.getVarargs()
+
     # Need {.convention.} and {.header.} if applicable
     if name != origname:
       if nimState.includeHeader():
@@ -1595,6 +1602,10 @@ proc addProc(nimState: NimState, node, rnode: TSNode) =
           # {.dynlib.} for DLLs
           nimState.addPragma(node, prident, "dynlib", nimState.getIdent(nimState.gState.dynlib))
 
+    if pvarargs:
+      # Add {.varargs.} for ...
+      nimState.addPragma(node, prident, "varargs")
+
     procDef.add prident
     procDef.add newNode(nkEmpty)
     procDef.add newNode(nkEmpty)
diff --git a/nimterop/getters.nim b/nimterop/getters.nim
index aeefbd8..c971bfc 100644
--- a/nimterop/getters.nim
+++ b/nimterop/getters.nim
@@ -288,6 +288,20 @@ proc getDeclarator*(node: TSNode): TSNode =
     elif node.len != 0:
       return node[0].getDeclarator()
 
+proc getVarargs*(node: TSNode): bool =
+  # Detect ... and add {.varargs.}
+  #
+  # `node` is the param list
+  #
+  # ... is an unnamed node, second last node and ) is last node
+  let
+    nlen = node.tsNodeChildCount()
+  if nlen > 1:
+    let
+      nval = node.tsNodeChild(nlen - 2).getName()
+    if nval == "...":
+      result = true
+
 proc firstChildInTree*(node: TSNode, ntype: string): TSNode =
   # Search for node type in tree - first children
   var
-- 
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