New function: hist-sort-by.

* eval.c (eval_init): Register hist-sort-by intrinsic.

* lib.c (hist_sort_by): New function.
(hist_sort): Wrapper for hist_sort_by now.

* lib.h (hist_sort_by): Declared.

* tests/012/sort.tl: Tests.

* txr.1: Documented.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib.h b/lib.h
index 0fc4e91a..349d0888 100644
--- a/lib.h
+++ b/lib.h
@@ -1342,6 +1342,7 @@ val sort_group(val seq, val keyfun, val lessfun);
 val unique(val seq, val keyfun, varg hashv_args);
 val uniq(val seq);
 val grade(val seq, val lessfun, val keyfun_in);
+val hist_sort_by(val fun, val seq, varg hashv_args);
 val hist_sort(val seq, varg hashv_args);
 val nrot(val seq, val n_in);
 val rot(val seq, val n_in);