hash-from-alist: new function.

* hash.c (hash_from_alist_v): New function.
(hash_init): Register hash-from-alist intrinsic.

* hash.h (hash_from_alist_v): Declared.

* txr.1: Documented.

1 files changed, 15 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index 272e1e2f..6babca4a 100644
--- a/hash.c
+++ b/hash.c
@@ -1195,6 +1195,20 @@ val hash_from_pairs_v(val pairs, struct args *hashv_args)
   return hash_construct(args_get_list(hashv_args), pairs);
 }
 
+val hash_from_alist_v(val alist, struct args *hashv_args)
+{
+  val hash = hashv(hashv_args);
+
+  alist = nullify(alist);
+
+  for (; alist; alist = cdr(alist)) {
+    val pair = car(alist);
+    sethash(hash, car(pair), cdr(pair));
+  }
+
+  return hash;
+}
+
 val hash_list(val keys, struct args *hashv_args)
 {
   val hash = hashv(hashv_args);
@@ -1598,6 +1612,7 @@ void hash_init(void)
   reg_fun(intern(lit("hash"), user_package), func_n0v(hashv));
   reg_fun(hash_construct_s, func_n2(hash_construct));
   reg_fun(intern(lit("hash-from-pairs"), user_package), func_n1v(hash_from_pairs_v));
+  reg_fun(intern(lit("hash-from-alist"), user_package), func_n1v(hash_from_alist_v));
   reg_fun(intern(lit("hash-list"), user_package), func_n1v(hash_list));
   reg_fun(intern(lit("gethash"), user_package), func_n3o(gethash_n, 2));
   reg_fun(intern(lit("inhash"), user_package), func_n3o(inhash, 2));