The pairlis function comes to TXR Lisp.

* eval.c (eval_init): Register pairlis intrinsic.

* lib.c, lib.h (pairlis): New function.

* tests/012/seq.tl: New test cases.

* txr.1: Documented.

* stdlib/doc-syms.tl: Updated.

1 files changed, 19 insertions, 0 deletions

diff --git a/lib.c b/lib.c
index cce37b3a..a82bdea7 100644
--- a/lib.c
+++ b/lib.c
@@ -10103,6 +10103,25 @@ val copy_alist(val list)
   return out;
 }
 
+val pairlis(val keys, val values, val alist_in)
+{
+  val self = lit("pairlis");
+  val alist = default_null_arg(alist_in);
+  seq_iter_t sik, siv;
+  val key, value;
+  list_collect_decl (out, ptail);
+
+  seq_iter_init(self, &sik, keys);
+  seq_iter_init(self, &siv, values);
+
+  while (seq_get(&sik, &key) && seq_get(&siv, &value))
+    ptail = list_collect(ptail, cons(key, value));
+
+  list_collect_nconc(ptail, alist);
+
+  return out;
+}
+
 val mapcar_listout(val fun, val seq)
 {
   val self = lit("mapcar");